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Philips Components
Product specification
High ohmic/high voltage resistors
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. DESCRIPTION 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 "MIL-STD 202E, method 215" and "IEC 60068-2-45". QUICK REFERENCE DATA DESCRIPTION Resistance range Resistance tolerance and series: 100 k to 15 M 15 M to 22 M 220 k to 15 M Maximum dissipation at Tamb = 70 C Thermal resistance, Rth Temperature coefficient Maximum permissible voltage: DC RMS Dielectric withstanding voltage of the insulation for 1 minute Basic specifications Climatic category (IEC 60068) Stability after: load (1000 hours) accelerated damp heat test (6 days) long term damp heat test (56 days) Noise VALUE 100 k to 22 M 5%: E24 series 10%: E12 series 1%: E24/E96 series 0.25 W 200 K/W 200 x 10-6/K 1600 V 1150 V 700 V IEC 60115-1B 55/155/56
VR25
R/R max.: 1.5% + 0.1 R/R max.: 1.5% + 0.1 R/R max.: 1.5% + 0.1 max. 5 V/V
1998 Aug 28
1
Philips Components
Product specification
High ohmic/high voltage resistors
ORDERING INFORMATION Table 1 Ordering code indicating resistor type and packaging ORDERING CODE 2322 241 ..... TYPE TAPE WIDTH (mm) TOL. (%) 1 52 VR25 26 Note 1. Radial taped version available on request. 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; see Table 1. * 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 in accordance with Table 2. Table 2 Last digit of 12NC LAST DIGIT 4 5 6 ORDERING EXAMPLE 5 10 5 10 BANDOLIER IN AMMOPACK(1) 1000 units 8.... 13... 12... - - 2000 units - - - 43... 42... 5000 units - 53... 52... - -
VR25
BANDOLIER ON REEL 5000 units - 23... 22... - -
RESISTANCE DECADE 100 to 976 k 1 to 9.76 M 10 M
The ordering code for a VR25, resistor value 7.5 M, 5% tolerance, supplied on a bandolier of 1000 units in ammopack, is: 2322 241 13755.
1998 Aug 28
2
Philips Components
Product specification
High ohmic/high voltage resistors
FUNCTIONAL DESCRIPTION Product characterization
VR25
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 "IEC publication 60063". Limiting values LIMITING VOLTAGE(1) (V) DC VR25 Note 1. The maximum voltage that may be continuously applied to the resistor element, see "IEC publication 60115-1". The maximum permissible hot-spot temperature is 155 C. DERATING The power that the resistor can dissipate depends on the operating temperature; see Fig.1.
20
CCA997
TYPE 1600
LIMITING POWER (W) RMS 1150 0.25
PULSE LOADING CAPABILITY
handbook, halfpage
Vmax (kV)
olumns Pmax (%Prated)
CCB412
^
10 8
100
50
6
0 -55
0
50
70
100
155 Tamb (C)
4 10-2
10-1
1
10
Rn (M)
102
Fig.2 Fig.1 Maximum dissipation (Pmax) in percentage of rated power as a function of the ambient temperature (Tamb).
Maximum allowed peak pulse voltage in accordance with "IEC 60065 chapter 14.1"; 50 discharges from a 1 nF capacitor charged to V max ; 12 discharges/minute (drift R/R 1%).
1998 Aug 28
3
Philips Components
Product specification
High ohmic/high voltage resistors
Application information
VR25
handbook, halfpage
100
MBG545
T (K)
handbook, halfpage
50
MBG546
T (K)
80
40 5 mm 10 mm 15 mm
60
30
40
20
20
10
0
0
0.2
0.4
P (W)
0.6
0 0 0.2 0.4 P (W) 0.6
VR25
VR25
Fig.4 Fig.3 Hot spot temperature rise (T) as a function of dissipated power.
Temperature rise (T) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting.
MECHANICAL DATA Mass per 100 units
L1
TYPE VR25 Marking
MASS (g) 25
olumns
d
CCB414
D L2
The nominal resistance and tolerance are marked on the resistor using four or five coloured bands in accordance with IEC publication 60062 "Colour 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 (L1) 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 ("IEC publication 60294").
For dimensions see Table 3.
Fig.5 Outline.
Table 3
Resistor type and relevant physical dimensions; see Fig.5 D MAX. (mm) 2.5 L1 MAX. (mm) 6.5 L2 MAX. (mm) 7.5 d (mm) 0.58 0.05
TYPE VR25
1998 Aug 28
4
Philips Components
Product specification
High ohmic/high voltage resistors
TESTS AND REQUIREMENTS Essentially all tests are carried out in accordance with the schedule of "IEC 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, "Recommended basic climatic and mechanical robustness testing procedure for electronic components" and under standard atmospheric conditions according to "IEC 60068-1", subclause 5.3.
VR25
Unless otherwise specified the following values apply: Temperature: 15 C to 35 C Relative humidity: 45% to 75% Air pressure: 86 kPa to 106 kPa (860 mbar to 1060 mbar). In Table 4 the tests and requirements are listed with reference to the relevant clauses of "IEC publications 60115-1 and 60068"; 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.
Table 4
Test procedures and requirements IEC 60068 TEST METHOD U Ua Ub Uc Ta Tb Na Eb Fc
IEC 60115-1 CLAUSE 4.16 4.16.2 4.16.3 4.16.4 4.17 4.18 4.19 4.20 4.22
TEST
PROCEDURE
REQUIREMENTS
robustness of terminations: tensile all samples bending half number of samples torsion other half of samples solderability resistance to soldering heat rapid change of temperature bump vibration 0.6 mm; load 10 N; 10 s 0.6 mm; load 5 N; 4 x 90 3 x 360 in opposite directions 2 s; 235 C; flux 600 thermal shock: 3 s; 350 C; 6 mm from body 30 minutes at -55 C and 30 minutes at +155 C; 5 cycles 3 x 1500 bumps in 3 directions; 40 g frequency 10 to 500 Hz; displacement 1.5 mm or acceleration 10 g; 3 directions; total 6 hours (3 x 2 hours) 16 hours; 155 C number of failures <10 x 10-6 number of failures <10 x 10-6 no damage R/R max.: 0.5% + 0.05 good tinning; no damage R/R max.: 0.5% + 0.05 R/R max.: 0.5% + 0.05 no damage R/R max.: 0.5% + 0.05 no damage R/R max.: 0.5% + 0.05
4.23 4.23.2 4.23.3 4.23.4 4.23.5 4.23.6 Ba Db Aa M Db
climatic sequence: dry heat damp heat (accelerated) 24 hours; 55 C; 90 to 100% RH 1st cycle cold low air pressure 2 hours; -55 C 2 hours; 8.5 kPa; 15 to 35 C Rins min.: 103 M R/R max.: 1.5% + 0.1
damp heat (accelerated) 5 days; 55 C; 95 to 100% RH remaining cycles
1998 Aug 28
5
Philips Components
Product specification
High ohmic/high voltage resistors
VR25
IEC 60115-1 CLAUSE 4.24.2
IEC 60068 TEST METHOD Ca
TEST
PROCEDURE 56 days; 40 C; 90 to 95% RH; dissipation 0.01 Pn; limiting voltage 100 V (DC) 1000 hours at 70 C; Pn or Vmax between -55 C and +155 C (TC x 10-6/K)
REQUIREMENTS R/R max.: 1.5% + 0.1
damp heat (steady state) endurance temperature coefficient
4.25.1 4.8.4 4.7 4.12 4.6.1.1 4.13
R/R max.: 1.5% + 0.1 200 no breakdown max. 5 V/V Rins min.: 104 M R/R max.: 0.5% + 0.05
voltage proof on insulation 700 V (RMS) during 1 minute; V-block method noise insulation resistance short time overload
"IEC publication 60195"
500 V (DC) during 1 minute; V-block method room temperature; dissipation 6.25 x Pn (voltage not more than 2 x limiting voltage); 10 cycles; 5 s on and 45 s off
1998 Aug 28
6

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