high ohmic/high voltage resistors www.vishay.com for technical questions contact: ff3dresistors@visha y .com document number: 28732 168 revision: 19-oct-04 VR25 vishay bccomponents features high pulse loading capability small size. applications where high resistance, high stability and high reliability at high voltage are required high humidity environment white goods power supplies. a metal glazed film is deposited on a high grade ceramic body. after a helical groove has been cut in the resistive layer, tinned electrolytic copper wires are welded to the end-caps. the resistors are coated with a light blue lacquer which provides electrical, mechanical, and climatic protection. the encapsulation is resistant to all cleaning solvents in accordance with ?il-std 202e, method 215?and ?ec 60068-2-45? note 1. ohmic values (other than resistance range) are available on request. technical specifications description value resistance range (1) 100 k w to 22 m w resistance tolerance and series: 100 k w to 15 m w 1 %: e24/e96 series; 5 %: e24 series 15 m w to 22 m w 5 %: e24 series; 10 %: e12 series maximum dissipation at t amb = 70 c 0.25 w thermal resistance, r th 140 k/w temperature coefficient 200 10 - 6 /k maximum permissible voltage: dc 1600 v rms 1150 v dielectric withstanding voltage of the insulation for 1 minute 700 v basic specifications iec 60115-1b climatic category (iec 60068) 55/155/56 stability after: load (1000 hours) d r/r max.: 1.5 % + 0.1 w accelerated damp heat test (6 days) d r/r max.: 1.5 % + 0.1 w long term damp heat test (56 days) d r/r max.: 1.5 % + 0.1 w noise max. 5 ?/v 12nc ordering code indicating resistor type and packaging type tape width (mm) tol. (%) ordering code 2322 241 ..... bandolier in ammopack bandolier on reel radial taped straight leads 4000 units 1000 units 2000 units 5000 units 5000 units VR25 52 1 0.... 8.... - 7.... 6.... 5 36... 13... - 53... 23... 10 12... - 52... 22... 26 5 - 43... -- 10 - 42... --
document number: 28732 for technical questions contact: ff3dresistors@visha y .com www.vishay.com revision: 19-oct-04 169 VR25 high ohmic/high voltage resistors vishay bccomponents ordering information numeric ordering code (12nc) the resistors have a 12-digit ordering code starting with 2322 241 the subsequent: first digit for 1 % tolerance products (e24 and e96 series) or 2 digits for 5 % (e24 series) and 10 % (e12 series) indicate the resistor type and packaging. the remaining digits indicate the resistance value: the first 3 digits for 1 % or 2 digits for 5 and 10 % tolerance products indicate the resistance value. the last digit indicates the resistance decade. last digit of 12nc indicating resistance decade ordering example the ordering code for a VR25, resistor value 7.5 m w , 5 % tolerance, supplied on a bandolier of 1000 units in ammopack, is: 2322 241 13755. resistance decade last digit 100 to 976 k w 4 1 to 9.76 m w 5 10 m w 6 dimensions d l 1 l 2 d outline. dimensions - resistor type and relevant physical dimensions type ? ? ? ? d max. l 1 max. l 2 max. ? ? ? ? d VR25 2.5 6.5 7.5 0.58 0.05 marking the nominal resistance and tolerance are marked on the resistor using four or five coloured bands in accordance with iec publication 60062 ?olour codes for fixed resistors . yellow and grey are used instead of gold and silver because metal particles in the lacquer could affect high-voltage properties. 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 deformation (?ec publication 60294? . mass per 100 units type mass (g) VR25 22 functional performance product characterization standard values of nominal resistance are taken from the e96/e24/e12 series for resistors with a tolerance of 1 %, 5 % or 10 %. the values of the e96/e24/e12 series are in accordance with ?ec publication 60063? note 1. the maximum voltage that may be continuously applied to the resistor element, see ?ec publication 60115-1 . the maximum permissible hot-spot temperature is 155 c. limiting values type limiting voltage (1) (v) limiting power (w) dc rms VR25 1600 1150 0.25
www.vishay.com for technical questions contact: ff3dresistors@visha y .com document number: 28732 170 revision: 19-oct-04 VR25 vishay bccomponents high ohmic/high voltage resistors derating pulse loading capability 70 100 50 0 0 50 100 155 - 55 t amb ( c) p max (%p rated ) maximum dissipation (p max ) in percentage of rated power as a function of the ambient temperature (t amb ). the power that the resistor can dissipate depends on the operating temperature. 4 6 8 10 10 2 20 10 - 2 10 - 1 10 1 r n (m w ) v max (kv) ^ maximum allowed peak pulse voltage in accordance with ?ec 60065 chapter 14.1 ; 50 discharges from a 1 nf capacitor charged to ; 12 discharges/minute (drift d r/r 2 %). v max application information 100 0 0.1 0.3 0 0.2 20 40 60 80 p (w) d t (k) hot-spot temperature rise ( d t) as a function of dissipated power. 50 0 0.1 0.3 0 0.2 10 20 30 40 p (w) d t (k) 5 mm 10 mm 15 mm temperature rise ( d t) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting.
document number: 28732 for technical questions contact: ff3dresistors@visha y .com www.vishay.com revision: 19-oct-04 171 VR25 high ohmic/high voltage resistors vishay bccomponents tests and requirements essentially all tests are carried out in accordance with the schedule of ?ec publication 60115-1? category lct/uct/56 (rated temperature range: lower category temperature, upper category temperature; damp heat, long term, 56 days). the testing also covers the requirements specified by eia and eiaj. the tests are carried out in accordance with iec publication 60068-2, ?ecommended basic climatic and mechanical robustness testing procedure for electronic components and under standard atmospheric conditions according to ?ec 60068-1? subclause 5.3. in the test procedures and requirements table the tests and requirements are listed with reference to the relevant clauses of ?ec publications 60115-1 and 60068-2? 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. all soldering tests are performed with mildly activated flux. test procedures and requirements iec 60115-1 clause iec 60068-2 test method test procedure requirements 4.16 21 (u) robustness of terminations: 4.16.2 21 (ua1) tensile all samples ? 0.6 mm; load 10 n; 10 s number of failures < 10 10 - 6 4.16.3 21 (ub) bending half number of samples ? 0.6 mm; load 5 n; 4 90 number of failures < 10 10 - 6 4.16.4 21 (uc) torsion other half of samples 3 360 in opposite directions no damage d r/r max.: 0.5 % + 0.05 w 4.17 20 (ta) solderability 2 s; 235 c good tinning; no damage 4.18 20 (tb) resistance to soldering heat thermal shock: 3 s; 350 c; 3 mm from body d r/r max.: 0.5 % + 0.05 w
www.vishay.com for technical questions contact: ff3dresistors@visha y .com document number: 28732 172 revision: 19-oct-04 VR25 vishay bccomponents high ohmic/high voltage resistors 4.19 14 (na) rapid change of temperature 30 minutes at - 55 c and 30 minutes at +155 c; 5 cycles d r/r max.: 0.5 % + 0.05 w 4.20 29 (eb) bump 3 1500 bumps in 3 directions; 40 g no damage d r/r max.: 0.5 % + 0.05 w 4.22 6 (fc) vibration frequency 10 to 500 hz; displacement 1.5 mm or acceleration 10 g; 3 directions; total 6 hours (3 2 hours) no damage d r/r max.: 0.5 % + 0.05 w 4.23 climatic sequence: 4.23.2 2 (ba) dry heat 16 hours; 155 c 4.23.3 30 (db) damp heat (accelerated) 1 st cycle 24 hours; 55 c; 90 to 100 % rh 4.23.4 1 (aa) cold 2 hours; - 55 c 4.23.5 13 (m) low air pressure 2 hours; 8.5 kpa; 15 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 w d r/r max.: 1.5 % + 0.1 w 4.24.2 3 (ca) damp heat (steady state) 56 days; 40 c; 90 to 95 % rh; dissipation 0.01 p n ; limiting voltage 100 v (dc) d r/r max.: 1.5 % + 0.1 w test procedures and requirements iec 60115-1 clause iec 60068-2 test method test procedure requirements
document number: 28732 for technical questions contact: ff3dresistors@visha y .com www.vishay.com revision: 19-oct-04 173 VR25 high ohmic/high voltage resistors vishay bccomponents 4.25.1 endurance 1000 hours at 70 c; p n or v max d r/r max.: 1.5 % + 0.1 w 4.8.4 temperature coef?ient between - 55 c and + 155 c (tc 10 - 6 /k) 200 4.7 voltage proof on insulation 700 v (rms) during 1 minute; v-block method no breakdown 4.12 noise ?ec publication 60195 max. 5 m v/v 4.6.1.1 insulation resistance 500 v (dc) during 1 minute; v-block method r ins min.: 10 4 m w 4.13 short time overload room temperature; dissipation 6.25 p n (voltage not more than 2 limiting voltage); 10 cycles; 5 s on and 45 s off d r/r max.: 2.0 % + 0.05 w 4.26 active ?mmability ?heese-cloth test steps of: 5/10/16/25/40 p n (rms) duration 5 minutes no ?ming of gauze cylinder other test in accordance with iec 60695 2.2 passive ?mmability ?eedle-?me test application of test ?me for 20 s no ignition of product; no ignition of under-layer; burning time less than 30 s test procedures and requirements iec 60115-1 clause iec 60068-2 test method test procedure requirements
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