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lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 1 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A dual and quad operational amplifiers description the lm2902/2904 series amplifiers consist of four and two independent high-gain operational amplifiers with very low input offset voltage specification. they have been designed to operate from a single power supply over a wide range of voltages; however operation from split power supplies is also possible. they offer low power supply current independent of the magnitude of the power supply voltage. the lm2902/2904 series are char acterized for operation from -40 to +125 and the dual devices are available in so-8 and the quad devices available in so- 14 and tssop-14 with industry standard pin-outs. both use green mold compound as standard. features ? wide power supply voltage range: ? single supply: 3v to 36v ? dual supplies: 1.5v to 18v ? very low supply current drain ? lm2904 500a ? independent of supply voltage ? lm2902 700a ? independent of supply voltage ? low input bias current: 20na ? low input offset voltage: ? a versions ?1mv (typ) ? non-a version?2mv(typ.) ? large dc voltage gain: 100db ? wide bandwidth (unity gain): 700khz (temperature compensated) ? internally compensated with unity gain. ? input common-mode voltage range includes ground ? differential input voltage range equal to the power supply voltage ? large output voltage swing: 0v to v cc -1.5v ? so-8(duals) and so-14/tssop- 14(quads) packages available ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments (top view) 1 2 3 7 6 5 4 8 so-8 1out v cc 2in- 2in+ 1in- 1in+ gnd 2out 1 + - + - 2 lm2904/ LM2904A (top view) 1 2 3 13 12 11 4 14 so-14/tssop-14 1out 4out 4in+ 7 6 5 9 10 8 gnd 3out 3in- 3in+ 1in- 1in+ v cc 2in+ 2in- 2out 4in- 2 + - 1 + - + - 4 + - 3 lm2902/ lm2902a notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more in formation about diodes incorporated?s definitions of halogen- a nd antimony-free, "green" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds.
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 2 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A schematic diagram functional block diagram of lm2902/ 2902a/ 2904/ 2904a (each amplifier) pin descriptions lm2902, lm2902a pin name pin # function 1out 1 channel 1 output 1in- 2 channel 1 inverting input 1in+ 3 channel 1 non-inverting input v cc 4 chip supply voltage 2in+ 5 channel 2 non-inverting input 2in- 6 channel 2 inverting input 2out 7 channel 2 output 3out 8 channel 3 output 3in- 9 channel 3 inverting input 3in+ 10 channel 3 non-inverting input gnd 11 ground 4in+ 12 channel 4 non-inverting input 4in- 13 channel 4 inverting input 4out 14 channel 4 output lm2904, LM2904A 1out 1 channel 1 output 1in- 2 channel 1 inverting input 1in+ 3 channel 1 non-inverting input gnd 4 ground 2in+ 5 channel 2 non-inverting input 2in- 6 channel 2 inverting input 2out 7 channel 2 output v cc 8 chip supply voltage
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 3 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A absolute maximum ratings (note 4) (@t a = +25c, unless otherwise specified.) symbol parameter rating unit v cc supply voltage 18 or 36 v v id differential input voltage 36 v v in input voltage -0.3 to +36 v ja package thermal impedance (note 5) so-8 tbd c/w so-14 tbd tssop-14 tbd jc package thermal impedance (note 6) so-8 tbd c/w so-14 tbd tssop-14 tbd ? output short-circuit to gnd (one amplifier) (note 7) v cc 15v and t a = +25 continuous ? t a operating temperature range -40 to +125 c t j operating junction temperature +150 c t st storage temperature range -65 to +150 c esd human body mode esd protection (note 8) 300 v machine mode esd protection 150 notes: 4. stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stres s ratings only; functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is n ot implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 5. maximum power dissipation is a function of t j (max) , ja , and t a . the maximum allowable power dissipation at any allowable ambient temperature is p d = (t j(max) ? t a )/ ja . operating at the absolute maximum t j of +150c can affect reliability. 6. maximum power dissipation is a function of t j(max) , jc , and t a . the maximum allowable power dissipation at any allowable ambient temperature is p d = (t j(max) ? t a )/ ja . operating at the absolute maximum t j of +150c can affect reliability. 7. short circuits from outputs to v cc or ground can cause excessive heating and eventual destruction. 8. human body model, 1.5k ? in series with 100pf.
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 4 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A electrical characteristics (notes 12 & 13) (@ v cc = +5.0v, t a = +25c, unless otherwise specified.) lm2902, lm2902a parameter conditions t a min typ max unit v io input offset voltage v ic = v cmr min, v o = 1.4v, v cc = 5v to max rs = 0 ? non-a device t a = +25c ? 2 7 mv full range ? ? 10 a-suffix device t a = +25c ? 1 2 full range ? ? 4 ? v io / ? t input offset voltage temperature drift rs = 0 ? full range ? 7 ? v/ i b input bias current i in+ or i in ? with out in linear range, v cmr = 0v (note 9) t a = +25c ? -20 -200 na full range ? ? -500 i io input offset current i in+ - i in ? , v cm = 0v t a = +25c ? 2 50 na full range ? ? 150 ? i io / ? t input offset current temperature drift ? full range ? 10 ? pa/ v cmr input common-mode voltage range v cc = 30v (note 10) t a = +25c 0 to v cc -1.5 ? ? v full range 0 to v cc -2.0 ? ? i cc supply current (four amplifiers) v o = 0.5v cc , no load v cc = 30v full range ? 1.0 3.0 ma v o = 0.5v cc , no load v cc = 5v full range ? 0.7 1.2 a v voltage gain v cc = 15v, v out = 1v to 11v, r l 2k ? t a = +25c 25 100 ? v/mv full range 15 ? ? cmrr common mode rejection ratio dc, v cmr = 0v to v cc -1.5v t a = +25c 60 70 ? db psrr power supply rejection ratio v cc = 5v to 30v t a = +25c 70 100 ? db amplifier to amplifier coupling f = 1khz to 20khz (input referred) (note 11) t a = +25c ? -120 ? db i sink output current sink v in - = 1v, v in + = 0v, v cc = 15v, v o = 200mv t a = +25c 12 50 ? a v in - = 1v, v in + = 0v, v cc = 15v, v o = 15v t a = +25c 10 20 ? ma full range 5 ? ? i source source v in + = 1v, v in - = 0v, v cc = 15v, v o = 0v t a = +25c -20 -40 -60 full range -10 ? ? i sc short-circuit to ground v cc = 5v, gnd = -5v, v o = 0v t a = +25c ? 40 60 ma v oh high-level output voltage swing r l = 10k ? t a = +25c ? v cc -1.5 ? v v cc = 30v r l = 2k ? , full range 26 ? ? r l 10k ? 27 28 ? v ol low-lever output voltage swing r l Q 10k ? full range ? 5 20 mv ac electrical characteristics (notes 12 & 13) (@ v cc = 15.0v, t a = +25c, unless otherwise specified.) lm2902, lm2902a parameter conditions typ unit sr slew rate at unity gain r l = 1m ? , c l = 30pf, v i = 10v 0.3 v/s b1 unity gain bandwidth r l = 1m ? , c l = 20pf 0.7 mhz vn equivalent input noise voltage r s = 100 ? , v i = 0v, f = 1khz 40 nv/ hz notes: 9. the direction of the input current is out of the ic due to the pnp input stage. this current is essentially constant, independe nt of the state of the output so no loading change exists on the input lines. 10. the input common-mode voltage of either input signal voltage should not be allowed to go negative by more than 0.3v (@ +25c). the upper end of the common-mode voltage range is v cc -1.5v (@ 25c), but either or both inputs can go to +36v without damage, independent of the magnitude of v cc . 11. due to proximity of external components, insure that coupling is not originating via stray capacitance between these external p arts. this typically can be detected as this type of capacitance increases at higher frequencies. 12. typical values are all at t a =25c conditions and represent the most likely parametric norm as determined at the time of characterization. actual typical values may vary over time and will also depend on the application and configuration. the typical values are not tested and are not guaranteed on shipped production material. 13. all limits are guaranteed by testing or statistical analys is. limits over the full temperature are guaranteed by design, bu t not tested in production.
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 5 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A electrical characteristics (cont.) (notes 12 & 13) (@ v cc = +5.0v, t a = +25c, unless otherwise specified.) lm2904, LM2904A parameter conditions t a min typ max unit v io input offset voltage v ic = v cmr min, v o = 1.4v, v cc = 5v to max rs = 0 ? non-a device t a = +25c ? 2 7 mv full range ? ? 10 a-suffix device t a = +25c ? 1 2 full range ? ? 4 ? v io / ? t input offset voltage temperature drift rs = 0 ? full range ? 7 ? v/ i b input bias current i in+ or i in ? with out in linear range, v cmr = 0v (note 9) t a = +25c ? -20 -250 na full range ? ? -500 i io input offset current i in+ - i in ? , v cm = 0v t a = +25c ? 2 50 na full range ? ? 150 ? i io / ? t input offset current temperature drift ? full range ? 10 ? pa/ v cmr input common-mode voltage range v cc = 30v (note 10) t a = +25c 0 to v cc -1.5 ? ? v full range 0 to v cc -2.0 ? ? i cc supply current (two amplifiers) v o = 0.5v cc , no load v cc = 30v full range ? 0.7 2.0 ma v o = 0.5v cc , no load v cc = 5v full range ? 0.5 1.2 a v voltage gain v cc = 15v, v out = 1v to 11v, r l 2k ? , t a = +25c 25 100 ? v/mv full range 15 ? ? cmrr common mode rejection ratio dc v cmr = 0v to v cc -1.5v t a = +25c 60 70 ? db psrr power supply rejection ratio v cc = 5v to 30v t a = +25c 70 100 ? db amplifier to amplifier coupling f = 1khz to 20khz (note 11) t a = +25c ? 120 ? db i sink output current sink v in - = 1v, v in + = 0v, v cc = 15v, v o = 200mv t a = +25c 12 50 ? a v in - = 1v, v in + = 0v, v cc = 15v, v o = 15v t a = +25c 10 20 ? ma full range 5 ? ? i source source v in + = 1v, v in - = 0v, v cc = 15v, v o = 0v t a = +25c -20 -40 -60 full range -10 ? ? i sc short-circuit to ground v cc = 5v, gnd = -5v, v o = 0v t a = +25c ? 40 60 ma v oh high-level output voltage swing r l = 10k ? t a = +25c v cc -1.5 ? ? v v cc = 30v r l = 2k ? , full range 26 ? ? r l 10k ? 27 28 ? v ol low-lever output voltage swing r l Q 10k ? full range ? 5 20 mv ac electrical characteristics (notes 12 & 13) (@ v cc = 15.0v, t a = +25c, unless otherwise specified.) lm2904, lm2904 a parameter conditions typ unit sr slew rate at unity gain r l = 1m ? , c l = 30pf, v i = 10v 0.3 v/s b1 unity gain bandwidth r l = 1m ? , c l = 20pf 0.7 mhz vn equivalent input noise voltage r s = 100 ? , v i = 0v, f = 1khz 40 nv/ hz notes: 9. the direction of the input current is out of the ic due to the pnp input stage. this current is essentially constant, independe nt of the state of the output so no loading change exists on the input lines. 10. the input common-mode voltage of either input signal voltage should not be allowed to go negative by more than 0.3v (@ +25c). the upper end of the common-mode voltage range is v cc -1.5v (@ 25c), but either or both inputs can go to +36v without damage, independent of the magnitude of v cc . 11. due to proximity of external components, insure that coupling is not originating via stray capacitance between these external p arts. this typically can be detected as this type of capacitance increases at higher frequencies. 12. typical values are all at t a =25c conditions and represent the most likely parametric norm as determined at the time of characterization. actual typical values may vary over time and will also depend on the application and configuration. the typical values are not tested and are not guaranteed on shipped production material. 13. all limits are guaranteed by testing or statistical analys is. limits over the full temperature are guaranteed by design, bu t not tested in production.
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 6 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A performance characteristics input voltage range input current supply current (lm2904/ 2904a) supply current (lm2902/ 2902a) voltage gain open loop frequency response
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 7 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A performance characteristics (cont.) large signal frequency response current limit output characteristics: current sourcing output characteristics: current sinking voltage follower pulse response voltage follower pulse response (small signal)
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 8 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A application information general information the lm2902/2904 series are op amps which operate with only a single power supply voltage, have true-differential inputs, and re main in the linear mode with an input common-mode voltage of 0 v dc . these amplifiers operate over a wide range of power supply voltage with little change in performance characteristics. at +25c amplifier operati on is possible down to a minimum supply voltage of 2.3 v dc . precautions should be taken to insure that the power supply for the integrated circui t never becomes reversed in polarity or th at the unit is not inadvertently installed backwards in a test socket as an unlimit ed current surge through the resulting forward diode within the ic could cause fusing of the internal conductors and result in a destroyed unit. large differential input voltages can be easily accommodated and, as input differential voltage protection diodes are not neede d, no large input currents result from large differential input voltages . the differential input voltage may be larger than v + without damaging the device. protection should be provided to prevent the input vo ltages from going negative more than -0.3 v dc (@ +25c). an input clamp diode with a resistor to the ic input terminal can be used. to reduce the power supply current drain, the amplifiers have a class a output stage for small signal levels which converts to class b in a large signal mode. these allows the amplifiers to both source and sink large output currents. therefore both npn and pnp external cur rent boost transistors can be used to extend the power capability of t he basic amplifiers. the output voltage needs to raise approximately 1 diode drop above ground to bias the on-chip vertical pnp trans istor for output current sinking applications. for ac applications, where the load is capacit ive coupled to the output of the amplifie r, a resistor should be used, from the o utput of the amplifier to ground to increase the class a bias current and prevent crossove r distortion. where the load is directly coupled, as in dc appl ications, there is no crossover distortion. capacitive loads which are applied directly to the output of t he amplifier reduce the loop stability margin. values of 50pf can be accommodated using the worst-case non-inverting unity gain connection. large closed l oop gains or resistive isol ation should be used if larg er load capacitance must be driven by the amplifier. the bias network of the lm2902/2904 series establishes a quiescent current which is independent of the magnitude of the power s upply voltage over the range of 3 v dc to 30 v dc . output short circuits either to ground or to the positive power supply should be of sh ort time duration. units can be destroyed , not as a result of the short circuit current causing metal fusing, but rather due to the large increase in ic chip dissipation which will cause eventu al failure due to excessive function temperatures. putting dire ct short-circuits on more than one amplif ier at a time will increase the total ic power dissipation to destructive levels, if not properly protected with external dissi pation limiting resistors in series with the output leads of t he amplifiers. the larger value of output source current wh ich is available at +25c provides a larger output current capability at elevated temperatures (see typical performance characteristics) than a standard ic op amp. the circuits presented in the section on typical applications emphasize operation on only a single power supply voltage. if com plementary power supplies are available, all of the standar d op amp circuits can be used. in general, introducing a pseudo-ground (a bias voltag e reference of v cc /2) will allow operation above and below this value in single power supp ly systems. many application circuits are shown which take advantage of the wide input common-mode voltage range which includes ground. in most cases, input biasing is not required and input voltages whi ch range to ground can easily be accommodated.
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 9 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A application information (cont.) power supply bypassing and layout the lm29xx family operate both single supply voltage range 3 to 36v or dual supply voltage 1.5v to 18v. as with any operation amplifier, proper supply bypassing is crit ical for low noise performance and high power supply rejection. for single supply operation system, a min. 0.1f bypass capacitor should be recommended to place as cl ose as possible between v cc pin and gnd. for dual supply operation, both the positive supply pin and negative supply pin should be bypass ed to ground with a separate 0.1f ceram ic capacitor. 2.2f tantalum capacitor can be added for better performance. ke ep the length of leads and trac es that connect capacitors betwe en lm29xx power supply pin and ground as short as possible. ordering information lm290x x xxx - 13 channel grade 4 : dual packing package s : so-8 13 : tape & reel 2 : quad a : low v io blank : normal s14 : so-14 t14 : tssop-14 part number package code packaging 13? tape and reel remark quantity part number suffix lm2902t14-13 t14 tssop-14 2500/tape & reel -13 rtp?d lm2902at14-13 t14 tssop-14 2500/tape & reel -13 rtp?d lm2902s14-13 s14 so-14 2500/tape & reel -13 under qualification lm2902as14-13 s14 so-14 2500/tape & reel -13 under qualification lm2904s-13 s so-8 2500/tape & reel -13 rtp?d LM2904As-13 s so-8 2500/tape & reel -13 rtp?d notes: 14. for packaging details, go to our website at http://www.diodes.com/products/packages.html
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 10 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A marking information (1) tssop-14 and so-14 ( top view ) 1 lm2902 x yy ww xx logo 14 part number 8 7 ww : week : 01~52; 52 yy : year : 12, 13,14~ x x : internal code represents 52 and 53 week x : grade : blank: normal a : low v io (2) so-8 lm2904 x (top view) yy ww x x part number logo x : grade : blank: normal a : low v io 8765 1 234 ww : week : 01~52; 52 yy : year : 12, 13,14~ x x : internal code represents 52 and 53 week
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 11 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A package outline dimensions (all dimensions in mm.) please see ap02002 at http://www.diodes.com /datasheets/ap02002.pdf for latest version. (1) package type: so-14 (2) package type: so-8 (3) package type: tssop-14 so-14 dim min max a 1.47 1.73 a1 0.10 0.25 a2 1.45 typ b 0.33 0.51 d 8.53 8.74 e 3.80 3.99 e 1.27 typ h 5.80 6.20 l 0.38 1.27 ?? 0 ? 8 ? all dimensions in mm so-8 dim min max a - 1.75 a1 0.10 0.20 a2 1.30 1.50 a3 0.15 0.25 b 0.3 0.5 d 4.85 4.95 e 5.90 6.10 e1 3.85 3.95 e 1.27 typ h - 0.35 l 0.62 0.82 ?? 0 ? 8 ? all dimensions in mm tssop-14 dim min max a1 7 (4x) a2 0 ? 8 a 4.9 5.10 b 4.30 4.50 c ?? 1.2 d 0.8 1.05 f 1.00 typ f1 0.45 0.75 g 0.65 typ k 0.19 0.30 l 6.40 typ all dimensions in mm e h a a2 e d a1 l gauge plane detail ?a? detail ?a? 7 ( 4 x ) ? b gauge plane seating plane detail ?a? detail ?a? e e1 h l d e b a2 a1 a 45 7 ~ 9 a3 0.254 g l a k a 1 d c a 2 f f1 pin# 1 indent detail ?a? detail ?a? 0 . 2 5 gauge plane seating plane b
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 12 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A suggested pad layout please see ap02001 at http://www.diodes.com/dat asheets/ap02001.pdf for the latest version. (1) package type: so-14 (2) package type: so-8 (3) package type: tssop-14 dimensions value (in mm) x 0.60 y 1.50 c1 5.4 c2 1.27 dimensions value (in mm) x 0.60 y 1.55 c1 5.4 c2 1.27 dimensions value (in mm) x 0.45 y 1.45 c1 5.9 c2 0.65 x c1 c2 y x c1 c2 y x c1 c2 y
lm2902/ lm2902a/ lm2904/ LM2904A document number: ds36780 rev. 1 - 2 13 of 13 www.diodes.com march 2014 ? diodes incorporated lm2902/ lm2902a/ lm2904/ LM2904A important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability w hatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this document is written in english but may be translated into multiple languages for reference. only the english version of t his document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical com ponents in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2014, diodes incorporated www.diodes.com

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