fusible, non-flammable metal film leaded resistors www.vishay.com for technical questions, contact: filmresistorsleaded@vishay.com document number: 28737 1 revision: 30-mar-10 nfr25, nfr25h vishay bccomponents description a homogeneous film of metal alloy is deposited on a high grade ceramic body. after a helical groove has been cut in the resistive layer, tinned connecting wires of electrolytic copper are welded to the end-caps. the resistors are coated with a grey, flame retarda nt lacquer which provides electrical, mechanical, and climatic protection. the encapsulant is resistant to all cleaning solvents in accordance with iec 60068-2-45 . features ? technology: metal film ? overload protection without risk of fire ? wide range of overload currents (refer fusing characteristics graphs) ? lead (pb)-free solder contacts ? pure tin plating provides compa tibility with lead (pb)-free and lead containing soldering processes ? compatible to rohs directive 2002/95/ec applications ?audio ?video notes ? r value is measured with probe distance of 24 mm 1 mm using 4-terminal method (1) ohmic values (other than resistance range) are available on request technical specifications description unit nfr25 nfr25h resistance range (1) 0.22 to 15k 0.22 to 15k resistance tolerance % 5 5 resistance series e24 e24 rated dissipation, p 70 w 0.33 0.5 thermal resistance ( r th ) k/w 240 150 temperature coefficient ppm/k 0.22 r 4.7 ? 200 200 4.7 < r 15 ? 200 100 15 < r 15 k ? 100 100 operating voltage, u max. dc or rms v 250 350 basic specifications iec 60 115-1 iec 60 115-1 climatic category (i ec 60068-1) 55/155/56 55/155/56 max. resistance change for resistance range, r max., after: load (1000 h, p 70 ): (1 % r + 0.05 ) (1 % r + 0.05 ) long term damp heat test (56 days): (1 % r + 0.05 ) (1 % r + 0.05 ) soldering (260 c, 10 s): (0.25 % r + 0.05 ) (0.25 % r + 0.05 )
document number: 28737 for technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com revision: 30-mar-10 2 nfr25, nfr25h fusible, non-flammable metal film leaded resistors vishay bccomponents dimensions notes ? the part number is shown to facilitate the introduction of a uni fied part numbering syst em for ordering products (1) please refer packaging table packaging model taping ammopack reel pieces code pieces code nfr25, nfr25h axial, 52 mm 5000 a5 5000 r5 1000 a1 nfr25, nfr25h radial 4000 n4 - - dimensions (resistor types, mass and relevant physical dimensions) type d max. (mm) l 1 max. (mm) l 2 max. (mm) ? d (mm) mass (mg) nfr25 2.5 6.5 7.5 0.58 0.05 201 nfr25h part number and product description part number: NFR2500002207JA100 model/size variant tcr/material value tolerance packaging (1) special nfr2500 nfr25h0 0 = neutral z = value overload (special) 0 = standard 3 digit value 1 digit multiplier multiplier j = 5 % n4 a5 a1 r5 the 2 digits are used for all special parts. 00 = standard 7 = *10 -3 8 = *10 -2 9 = *10 -1 0 = *10 0 1 = *10 1 2 = *10 2 product description: nfr25 5 % a1 r22 nfr25 5 % a1 r22 model/size tolerance packaging (1) resistance value nfr25 nfr25h 5 % n4 a5 a1 r5 1k0 = 1 k 4r7 = 4.7 ? d l 1 l 2 ? d outline n f r 2 5 0 0 0 0 2 2 0 7 j 0 a 1 0
www.vishay.com for technical questions, contact: filmresistorsleaded@vishay.com document number: 28737 3 revision: 30-mar-10 nfr25, nfr25h vishay bccomponents fusible, non-flammable metal film leaded resistors products with radial leads (nfr25, nfr25h) note ? please refer document number 28721 packagi ng for more detail marking the nominal resistance and tolerance are marked on the resistor using four colored bands in accordance with iec 60062, marking codes for resistors and capacitors. for ease of recognition a fifth ring is added, which is violet for type nfr25 and white for type nfr25h. outlines the length of the body (l 1 ) is measured by inserting the leads into holes of two identical gauge plates and moving these plates parallel to each other until the resistor body is clamped without defo rmation (iec 60294). functional performance, product characterization standard values of nominal resistance are taken from the e24 series for resistors with a tolerance of 5 %. the values of the e24 series are in accordance with iec 60063. note (1) the maximum voltage that may be continuous ly applied to the re sistor element, see iec 60115-1. the maximum permissible hot-spot temperature is 155 c. dimensions (radial taping) symbol parameter value tolerance unit p pitch of components 12.7 1.0 mm p 0 feed-hole pitch 12.7 0.2 mm p 1 feed-hole centre to lead at topside at the tape 3.85 0.5 mm p 2 feed-hole center to bo dy center 6.35 1.0 mm f lead-to-lead distance 4.8 + 0.7/- 0 mm w tape width 18.0 0.5 mm w 0 minimum hold down tape width 5.5 - mm h 1 component height 29.0 max. mm h 0 lead wire clinch height 16.5 0.5 mm h height of component from tape center 19.5 1 mm d 0 feed-hole diameter 4.0 0.2 mm l maximum length of snipped lead 11.0 - mm l 1 minimum lead wire (tape portion) shortest lead 2.5 - mm p p 2 w w 0 d 0 p 1 p 0 l 1 l f h 0 h 1 h limiting values type limiting voltage u (1) (v) limiting power p 70 (w) nfr25 250 0.33 nfr25h 350 0.5
document number: 28737 for technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com revision: 30-mar-10 4 nfr25, nfr25h fusible, non-flammable metal film leaded resistors vishay bccomponents derating the power that the resistor can dissipate depends on the operating temperature. maximum dissipation ( p max. ) in percentage of rated power as a function of the ambient temperature ( t amb ) fusing characteristics the resistors will fuse without the risk of fire and within an indicated range of overload. fusi ng means that the resistive val ue of the resistor increases at least 100 times. the fusing characteristic is me asured under constant voltage. nfr25 this graph is based on measured data which may deviate accordi ng to the application. fusing characteristics: 1 nfr25 this graph is base d on measured data which may deviate according to the application. fusing characteristics: 1 r 15 nfr25 this graph is based on measured data which may deviate according to the application. fusing characteristics: 15 r 15 k 70 100 50 0 0 50 100 155 - 55 p max. (% p rate d ) t am b (c) 10 3 10 2 10 1 10 -1 12 4 0 8 p overloa d (w) t (s) 16 20 24 10 3 10 2 10 1 10 -1 6 2 0 4 p overloa d (w) t (s) 81012 10 3 10 2 10 1 10 -1 6 2 0 4 p overloa d (w) t (s) 81012
www.vishay.com for technical questions, contact: filmresistorsleaded@vishay.com document number: 28737 5 revision: 30-mar-10 nfr25, nfr25h vishay bccomponents fusible, non-flammable metal film leaded resistors fusing characteristics nfr25h this graph is base d on measured data which may deviate according to the application. fusing characteristics: 1 nfr25h this graph is base d on measured data which may deviate according to the application. fusing characteristic: 1 r 15 k pulse loading capabilities nfr25 pulse on a regular basis; maximu m permissible peak pulse power ( p max. ) as a function of pulse duration ( t i ), 0.22 r < 15 nfr25 pulse on a regular basis; maximu m permissible peak pulse power ( p max. ) as a function of pulse duration ( t i ), 15 r 15 k 10 3 10 2 10 1 10 -1 12 4 0 8 p overloa d (w) t (s) 16 20 24 10 3 10 2 10 1 10 -1 12 4 0 8 p overloa d (w) t (s) 16 20 24 10 3 10 2 10 1 10 -1 50 20 10 5 2 t i (s) t p / t i = 1000 10 -6 10 -5 10 -4 10 - 3 10 -2 10 -1 1 500 200 100 p max. (w) ? 20 2 100 10 3 10 2 10 1 10 -1 t i (s) 10 -6 10 -5 10 -4 10 - 3 10 -2 10 -1 1 p max. (w) ? t p / t i = 1000 ? ?
document number: 28737 for technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com revision: 30-mar-10 6 nfr25, nfr25h fusible, non-flammable metal film leaded resistors vishay bccomponents pulse loading capabilities nfr25 pulse on a regular basis; maximum permissible peak pulse voltage ( u max. ) as a function of pulse duration ( t i ) nfr25h pulse on a regular basis; maximu m permissible peak pulse power ( p max. ) as a function of pulse duration ( t i ) nfr25h pulse on a regular basis; maximu m permissible peak pulse voltage ( u max. ) as a function of pulse duration ( t i ) 600 t i (s) 10 -6 10 -5 10 -4 10 - 3 10 -2 10 -1 1 u max. (v) ? 500 400 3 00 200 100 0 2 5 10 20 50 100 200 500 10 3 10 2 10 1 10 -1 t i (s) 10 -6 10 -5 10 -4 10 - 3 10 -2 10 -1 1 p max. (w) ? t p / t i = 1000 1200 t i (s) 10 -6 10 -5 10 -4 10 - 3 10 -2 10 -1 1 u max. (v) ? 1000 800 600 400 200 0 ? ? ?
www.vishay.com for technical questions, contact: filmresistorsleaded@vishay.com document number: 28737 7 revision: 30-mar-10 nfr25, nfr25h vishay bccomponents fusible, non-flammable metal film leaded resistors application information nfr25 hot-spot temperature rise ( t ) as a function of dissipated power minimum distance from resist or body to p.c.b. = 1 mm nfr25 temperature rise ( t ) at thr lead end (sol dering point) as a function of dissipated power at various lead lengths after mounting nfr25h hot-spot temperature rise ( t ) as a function of dissipated power minimum distance from resist or body to p.c.b. = 1 mm nfr25h temperature rise ( t ) at thr lead end (soldering point) as a function of dissipated power at various lead leng ths after mounting tests and requirementes essentially all tests are ca rried out in accordance with iec 60115-1 specification, category lct/uct/56 (rated temperature range: lower category te mperature, upper category temperature; damp heat, long term, 56 days). the tests are carried out in accordance with iec 60068-2-xx test method, recommended basic climatic and mechanical robustness test ing procedure for electronic components and under stan dard atmospheric conditions according to iec 60068-1, 5.3. in the test procedures and requirements table the tests and requirements are li sted with reference to the relevant clauses of iec 60115-1 and iec 60068-2-xx test methods. a short description of the test procedure is also given. in some instances deviations from the iec recommendations were necessary for our method of specifying. for inflammability requirements reference is made to iec 60115-1. all soldering tests are performed with mildly activated flux. 100 0 0.2 0.6 0 0.4 20 40 60 80 p (w) t (k) 50 0 0.2 0.6 0 0.4 10 20 3 0 40 p (w) t (k) 15 mm 5 mm 10 mm 100 0 0.2 0.6 0 0.4 20 40 60 80 p (w) t (k) 15 mm 5 mm 10 mm 50 0 0.2 0.6 0 0.4 10 20 3 0 40 p (w) t (k)
document number: 28737 for technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com revision: 30-mar-10 8 nfr25, nfr25h fusible, non-flammable metal film leaded resistors vishay bccomponents test procedures and requirements iec 60115-1 clause iec 60068-2 test method test procedure requirements nfr25 nfr25h 4.4.1 visual examination no holes; clean surface; no damage 4.4.2 dimensions (outline) gauge (mm) see dimensions table 4.5 resistance (refer note on first page for measuring distance) applied voltage (+ 0 %/- 10 %): r < 10 : 0.1 v 10 r < 100 : 0.3 v 100 r < 1 k : 1 v 1 k r < 10 k : 3 v 10 k r 15 k : 10 v r - r nom. : max. 5 % 4.18 20 (tb) resistance to soldering heat thermal shock: 10 s; 260 c; 3 mm from body r max.: (0.25 % r + 0.05 ) 4.29 45 (xa) component solvent resistance isopropyl alcohol or h 2 o followed by brushing no visual damage 4.17 20 (ta) solderability 2 s; 235 c: solder bath method; snpb40 3 s; 245 c: solder bath method; snag3cu0.5 good tinning ( 95 % covered); no damage solderability (after aging) 8 h steam or 16 h, 155 c; leads immersed 6 mm; for 2 s at 235 c: solder bath (snpb40) for 3 s at 245 c: solder bath (snag3cu0.5) method good tinning ( 95 % covered); no damage 4.7 voltage proof on insulation u rms = 500 v during 1 min; metal block method no breakdown or flashover 4.16 robustness of terminations: 4.16.2 21 (ua1) tensile all samples load 10 n; 10 s numbe r of failures < 10 x 10 -6 4.16.3 21 (ub) bending half number of samples load 5 n; 4 x 90 number of failures < 10 x 10 -6 4.16.4 21 (uc) torsion other half of samples 3 x 360 in oppo site directions no damage r max.: (0.25 % r + 0.05 ) 4.20 29 (eb) bump 3 x 1500 bumps in 3 directions; 40 g no damage r max.: (0.25 % r + 0.05 ) 4.22 6 (fc) vibration frequency 10 hz to 500 hz; displacement 1.5 mm or acceleration 10 g; 3 directions; total 6 h (3 x 2 h) no damage r max.: (0.25 % r + 0.05 ) 4.19 14 (na) rapid change of temperature 30 min at lct and 30 min at uct; 5 cycles no visual damage r max.: (0.25 % r + 0.05 ) 4.23 climatic sequence: 4.23.2 2 (ba) dry heat 16 h; 155 c 4.23.3 30 (db) damp heat (accelerated) 1 st cycle 24 h; 55 c; 90 % to 100 % rh 4.23.4 1 (aa) cold 2 h; - 55 c 4.23.5 13 (m) low air pressure 2 h; 8.5 kpa; 15 c to 35 c 4.23.6 30 (db) damp heat (accelerated) remaining cycles 5 days; 55 c; 95 % to 100 % rh r ins min.: 10 3 m r max.: (1.5 % r + 0.1 ) 4.24 78 (cab) damp heat (steady state) 56 days; 40 c; 90 % to 95 % rh; loaded with 0.01 p 70 (iec steps: 0 v to 100 v) r ins min.: 10 3 m r max.: (1 % r + 0.05 ) 4.25.1 endurance (at 70 c) 1000 h; loaded with p 70 or u max. ; 1.5 h on and 0.5 h off r max.: (1 % r + 0.05 ) 4.25.3 endurance at upper category temperature 1000 h; no load r max.: (1 % r + 0.05 ) 4.8 temperature coefficient between - 55 c and + 155 c 0.22 r 4.7 4.7 < r 15 15 < r 15 k 200 ppm/k 200 ppm/k 100 ppm/k 200 ppm/k 100 ppm/k 100 ppm/k 4.12 noise iec 60195 < 0.1 v/v 4.26 accidental overload ch eese-cloth non flammable 4.6.1.1 insulation resistance maximum voltage u max. dc = 500 v after 1 min; metal block method r ins min.: 10 4 m
www.vishay.com for technical questions, contact: filmresistorsleaded@vishay.com document number: 28737 9 revision: 30-mar-10 nfr25, nfr25h vishay bccomponents fusible, non-flammable metal film leaded resistors 12nc information for historical coding reference ? the resistors have a 12 digit numeric code starting with 23 ? the subsequent 7 digits indi cate the resistor type and packaging ? the remaining 3 digits indi cate the resistance value: - the first 2 digits indica te the resistance value - the last digit indicates the resistance decade last digit of 12nc indi cating resistance decade 12nc example the 12nc of a nfr25 resistor with value 750 , supplied on a bandolier of 1000 units in ammopack is: 2322 205 13751. resistance decade last digit 0.22 to 0.91 7 1 to 9.1 8 10 to 91 9 100 to 910 1 1 k to 9.1 k 2 10 k to 15 k 3 12nc (resistors type and packaging) type 23.. ... ..... bandolier in ammopack bandolier on reel radial taped straight leads straight leads 4000 units 1000 units 5000 units 5000 units nfr25 06 204 03... 22 205 13... 22 205 33... 22 205 23... nfr25h 06 207 03... 22 207 13... 22 207 33... 22 207 23...
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