________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 1/10 uesd6v8lxx low capacitance tvs diode array for esd protection uesd6v8l4a sc70-5/sc88a/sot353 uesd6v8l4b sc89-5/sot553/sot665 UESD6V8L5A6 sc70-6/sc88/sot363 uesd6v8l5b sc89-6/sot563/sot666 general description the uesd6v8lxx of tvs diode array is designed to protect sensitive electronics from damage or latch-up due to esd, for use in applications where board space is at a premium. it is unidirectional device and may be used on lines where the signal polarities are above ground. uesd6v8l4a and uesd6v8l4b protect up to four lines while UESD6V8L5A6 and uesd6v8l5b will protect up to five lines. tv s diodes are solid-state devices feature large cross-sectional area junctions for conducting high transient currents, specifically for transient suppression. it offers desirable characteristics for board level protection including fast response time, low operating, low clamping voltage, and no device degradation. the uesd6v8lxx may be used to meet the immunity requirements of iec 61000-4-2, level 4. the small package makes them ideal for use in portable electronics such as cell phones, pda?s, notebook computers, and digital cameras. the uesd6v8lxx is fabricated using dual diffusion technology, offer low junction capacitance (20pf), which is required in high speed signal protection application. . applications features z cellular handsets & accessories z cordless phones z personal digital assistants (pda?s) z notebooks & handhelds z portable instrumentation z digital cameras z peripherals z mp3 players z transient protection for data lines to iec 61000-4-2 (esd) 15kv (air), 8kv (contact) z ultra-small package z working voltages: 5v z low leakage current z low clamping voltage z solid-state silicon avalanche technology ordering information part number working voltage packaging type channel marking code shipping qty uesd6v8l4a sc70-5/sc88a/sot353 uka uesd6v8l4b sc89-5/sot553/sot665 4 usb UESD6V8L5A6 sc70-6/sc88/sot363 u6a uesd6v8l5b 5.0v sc89-6/sot563/sot666 5 ub 3000pcs/ 7inch reel
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 2/10 uesd6v8lxx pin configurations uesd6v8l4a sc70-5/sc88a/sot353 uesd6v8l4b sc89-5/sot553/sot665 UESD6V8L5A6 sc70-6/sc88/sot363 uesd6v8l5b sc89-6/sot563/sot666 top view m: month code uesd6v8l4a sc70-5/sc88a/sot353 m: month code uesd6v8l4b sc89-5/sot553/sot665 m: month code UESD6V8L5A6 sc70-6/sc88/sot363 m: month code uesd6v8l5b sc89-6/sot563/sot666 2 1 3 4 5 2 1 3 4 6 5 2 1 3 4 6 5 2 1 3 4 5
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 3/10 uesd6v8lxx absolute maximum ratings rating symbol value unit peak pulse power (tp = 8/20 s) p pk 55 watts lead soldering temperature t l 260(10 sec.) c operating temperature t j -55 to +125 c storage temperature t stg -55 to +125 c maximum junction temperature t jmax 150 c electrical characteristics parameter symbol conditions min typ max unit reverse stand-off voltage v rwm 5 v reverse breakdown voltage v br it = 1ma 6 6.8 7.2 v reverse leakage current i r v rwm = 5v, t=25c 0.005 0.1 a i pp =1a, tp = 8/20 s 6 i pp =2a, tp = 8/20 s 8 clamping voltage v c i pp =5a, tp = 8/20 s 10.8 v junction capacitance c j pin 1,3,4,5,6 to 2 v r = 0v, f = 1mhz 20 25 pf junction capacitance c j pin 1,3,4,5,6 to 2 v r = 2.5v, f = 1mhz 12 17 pf
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 4/10 uesd6v8lxx typical operating characteristics non-repetitive peak pulse power vs. pulse time clamping voltage vs. peak pulse current 0.1 1 10 100 1000 0.01 0.1 1 10 pulse duration - tp(us) peak pulse power - ppk(kw) 012345 6 7 8 9 10 11 waveform parameters: tr=8us td=20us clamping voltage - vc (v) peak pulse current - ipp (a) forward voltage vs. forward current junction capacitance vs. reverse voltage 0123456 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 forward voltage-vf(v) forward current-if(a) 012345 0 5 10 15 20 25 capacitance-(pf) revers voltage-vr(v)
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 5/10 uesd6v8lxx application information uesd6v8lxx can use as unidirectional lines or bidirectional lines protector. for example, uesd6v8l4b can use as a four unidirectional lines protector, and also can use as a three bidirectional lines protector (as figure1 shows). for bidirectional applications, the junction capacitance between i/o ports and ground is half of the single tvs?s junction capacitance, that is to say the typical value of the junction capac itance between i/o ports and ground is 6pf. the break down voltage of these two series connection tvs is a forwards voltage (about 0.7v) higher than a single tvs?s. figure1: uesd6v8l4b use as three bidirectional lines protector circuit board layout recommendations for suppression of esd good circuit board layout is critical for the s uppression of esd induced transients. the following guidelines are recommended: 1. place the tvs near the input terminals or c onnectors to restrict transient coupling. 2. minimize the path length between the tvs and the protected line. 3. minimize all conductive loops including power and ground loops. 4. the esd transient return path to ground should be kept as short as possible. 5. never run critical signals near board edges. 6. use ground planes whenever possible. for mu ltilayer printed-circuit boards, use ground vias. 7. keep parallel signal paths to a minimum. 8. avoid running protection conductors in parallel with unprotected conductor. 9. minimize all printed-circuit board conductiv e loops including power and ground loops. 10. avoid using shared transient return paths to a common ground point.
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 6/10 uesd6v8lxx package information uesd6v8l4a sc70-5/sc88a/sot353 outline drawing dimensions millimeters inches symbol min max min max a 0.900 1.100 0.035 0.043 a1 0.000 0.100 0.000 0.004 a2 0.900 1.000 0.035 0.039 b 0.150 0.350 0.006 0.014 c 0.080 0.150 0.003 0.006 d 2.000 2.200 0.079 0.087 e 1.150 1.350 0.045 0.053 e1 2.150 2.450 0.085 0.096 e 0.650ref 0.026ref e1 1.200 1.400 0.047 0.055 l 0.525ref 0.021ref l1 0.260 0.460 0.010 0.018 0 8 0 8 land pattern notes: 1. compound dimension: 2.101.25; 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 7/10 uesd6v8lxx uesd6v8l4b sc89-5/sot553/sot665 outline drawing dimensions millimeters inches symbol min max min max a 0.525 0.620 0.021 0.024 a1 0.000 0.050 0.000 0.002 b 0.150 0.300 0.006 0.012 c 0.090 0.180 0.004 0.007 d 1.500 1.700 0.059 0.067 e 1.100 1.300 0.043 0.051 e1 1.500 1.700 0.059 0.067 e 0.450 0.550 0.018 0.022 l 0.100 0.300 0.004 0.012 7ref 7ref *: the maximum length is 0.10mm. land pattern notes: 1. compound dimension: 1.601.20; 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is ju st for reference. tape and reel orientation
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 8/10 uesd6v8lxx UESD6V8L5A6 sc70-6/sc88/sot363 outline drawing dimensions millimeters inches symbol min max min max a 0.900 1.100 0.035 0.043 a1 0.000 0.100 0.000 0.004 a2 0.900 1.000 0.035 0.039 b 0.150 0.350 0.006 0.014 c 0.080 0.150 0.003 0.006 d 2.000 2.200 0.079 0.087 e 1.150 1.350 0.045 0.053 e1 2.150 2.450 0.085 0.096 e 0.650ref 0.026ref e1 1.200 1.400 0.047 0.055 l 0.525ref 0.021ref l1 0.260 0.460 0.010 0.018 0 8 0 8 land pattern notes: 1. compound dimension: 2.101.25; 2. unit: mm; 3. general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 9/10 uesd6v8lxx uesd6v8l5b sc89-6/sot563/sot666 outline drawing dimensions millimeter s inches symbol min max min max a 0.525 0.600 0.021 0.024 a1 0.000 0.050 0.000 0.002 b 0.150 0.300 0.006 0.012 c 0.090 0.180 0.004 0.007 d 1.500 1.700 0.059 0.067 e 1.100 1.300 0.043 0.051 e1 1.500 1.700 0.059 0.067 e 0.450 0.550 0.018 0.022 l 0.100 0.300 0.004 0.012 7ref 7ref land pattern notes: 1. compound dimension: 1.601.20; 2. unit: mm; 3.general tolerance 0.05mm unless otherwise specified; 4. the layout is just for reference. tape and reel orientation
________________________________________________________________________ http://www.union-ic.com rev.02 jul.2012 10/10 uesd6v8lxx important notice the information in this document has been ca refully reviewed and is believed to be accurate. nonetheless, this document is subjec t to change without notice. union assumes no responsibility for any inaccuracies that may be contained in this document, and makes no commitment to update or to keep current the contained information, or to notify a person or organization of any update. union rese rves the right to make changes, at any time, in order to improve reliability, function or design and to attempt to supply the best product possible. union semiconductor, inc add: 2f, no. 3, lane 647 songtao road, shanghai 201203 tel: 021-51093966 fax: 021-51026018 website: www.union-ic.com
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