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ManualsBrandsVishay ManualsPassive ComponentsHigh Ohmic High Voltage Metal Glaze Leaded Resistor 500mW 1MOhm5%

VR25, VR37, VR68

www.vishay.com

Vishay BCcomponents

Revision: 21-Sep-2018

Document Number: 28907

For technical questions, contact: filmresistorsleaded@vishay.com

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000

High Ohmic / High Voltage Metal Glaze Leaded Resistors

DESIGN SUPPORT TOOLS

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.

FEATURES

• UL Approved (UL1676, file no: E171160)

• Meet the safety requirements of:

- IEC 60065

- DIN EN 60065

- VDE 0860

- CQC (China)

• AEC-Q200 qualified (VR25, VR37)

• High pulse loading capability (maximum 10 kV)

• Radial version available for VR25

• Material categorization: for definitions of compliance

please see www.vishay.com/doc?99912

APPLICATIONS

• Where high resistance, high stability, and high reliability at

high voltage are required

• High humidity environment

• White goods

• Power supplies

• Automotive electronics

Note

(1)

Ohmic values (other than resistance range) are available on request

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Available

Models

TECHNICAL SPECIFICATIONS

DESCRIPTION VR25 VR37 VR68

Imperial size 0207 0309 0718

Resistance range

(1)

100 k to 22 M 100 k to 33 M 100 k to 68 M

Resistance tolerance ± 10 %; ± 5 %; ± 1 %

Temperature coefficient  ± 200 ppm/K

Rated dissipation, P

0.25 W 0.5 W 1.0 W

Operating voltage, U

max.

AC/DC 1600 V 3500 V 10 000 V

Operating temperature range -55 °C to +155 °C

Peak permissible film temperature 155 °C

Thermal resistance (R

) 140 K/W 120 K/W 70 K/W

Insulation voltage:

1 min.; U

ins

700 V

Maximum noise (white noise) 5 µV/V 2.5 µV/V 2.5 µV/V

Max. resistance change at

rated dissipation for resistance range,

|R/R| max., after 1000 h

1.5 % 1.5 % 1.5 %

SAFETY REQUIREMENTS AND QUALIFICATIONS

DESCRIPTION VR25, VR37 VR37 VR68

Safety requirements / qualifications AEC-Q200

UL1676 qualification (file no: E171160)

for ohmic range 510 k to 11 M;

DIN EN 60065 (VDE 0860): 2015; clause 14.2 a);

EN 60065: 2014

IEC 60065: clause 14.2 a)

CQC

Summary of content (10 pages)

PAGE 1
VR25, VR37, VR68 www.vishay.com Vishay BCcomponents High Ohmic / High Voltage Metal Glaze Leaded Resistors FEATURES • UL Approved (UL1676, file no: E171160) • Meet the safety requirements of: - IEC 60065 - DIN EN 60065 - VDE 0860 - CQC (China) • AEC-Q200 qualified (VR25, VR37) • High pulse loading capability (maximum 10 kV) • Radial version available for VR25 DESIGN SUPPORT TOOLS • Material categorization: for definitions of compliance please see www.vishay.
PAGE 2
VR25, VR37, VR68 www.vishay.
PAGE 3
VR25, VR37, VR68 www.vishay.com DESCRIPTION Production is strictly controlled and follows an extensive set of instructions established for reproducibility. A homogeneous film of metal alloy is deposited on a high grade ceramic body and conditioned to achieve the desired temperature coefficient. Plated steel termination caps are firmly pressed on the metalized rods.
PAGE 4
VR25, VR37, VR68 www.vishay.com Vishay BCcomponents FUNCTIONAL PERFORMANCE Power in % Derating 100 80 60 40 20 0 -55 0 50 100 70 125 155 Ambient Temperature in °C Hot-Spot Temperature Rise (T) as a Function of Dissipated Power ΔT (K) 35 ΔT (K) 30 60 50 25 40 20 30 15 20 10 10 5 0 0 0.05 0.10 0.15 0.20 P (W) 0 0.25 0.1 0 VR25 0.2 0.3 0.4 P (W) 0.5 VR37 ΔT (K) 70 60 50 40 30 20 10 0 0 0.2 0.4 0.6 0.8 P (W) 1.
PAGE 5
VR25, VR37, VR68 www.vishay.com Vishay BCcomponents Maximum allowed peak pulse voltage in accordance with IEC 60065, 14.2 a); 50 discharges from a 1nF capacitor charged to Ûmax.; 12 discharges/min (drift R/R  2 %) Ûmax. (kV) 8 7 6 5 4 -2 10 10-1 1 Rn (MΩ) 10 102 10 102 10 102 VR25 11 Ûmax. (kV) 10 9 8 7 6 5 4 -2 10 10-1 1 Rn (MΩ) VR37 11 Ûmax.
PAGE 6
VR25, VR37, VR68 www.vishay.com Vishay BCcomponents Temperature Rise (T) at the Lead End (Soldering Point) as a Function of Dissipated Power at Various Lead Lengths after Mounting ΔT (K) 35 30 5 mm 10 mm 25 15 mm 20 15 10 5 0 0 0.025 0.05 0.075 0.10 0.125 P (W) 0.15 0.175 0.20 0.225 0.25 VR25 ΔT (K) 40 35 30 5 mm 10 mm 15 mm 25 20 15 10 5 0 0 0.1 0.2 0.3 0.4 0.5 P (W) VR37 ΔT (K) 50 10 mm 40 30 15 mm 20 10 0 0 0.2 0.4 0.6 0.8 1.
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VR25, VR37, VR68 www.vishay.com Vishay BCcomponents TESTS PROCEDURES AND REQUIREMENTS All tests are carried out in accordance with the following specifications: Unless otherwise specified the following values apply: • IEC 60115-1, generic specification (includes tests) • Relative humidity: 45 % to 75 % The test and requirements table contains only the most important tests. For the full test schedule refer to the documents listed above. • Air pressure: 86 kPa to 106 kPa (860 mbar to 1060 mbar).
PAGE 8
VR25, VR37, VR68 www.vishay.com Vishay BCcomponents TESTS PROCEDURES AND REQUIREMENTS TEST PROCEDURE REQUIREMENTS PERMISSIBLE CHANGE (Rmax.) Damp heat (steady state) 56 days; 40 °C; 90 % to 95 % RH; loaded with 0.01 P70 (steps: 0 V to 100 V) R max.: ± 1.5 % R Endurance (at 70 °C) 1000 h; loaded with P70 or Umax.; 1.5 h ON and 0.5 h OFF R max.: ± 1.5 % R 4.
PAGE 9
VR25, VR37, VR68 www.vishay.com Vishay BCcomponents HISTORICAL 12NC INFORMATION • The resistors have a 12-digit numeric code starting with Last Digit of 12NC Indicating Resistance Decade - 2322 241 refers to VR25 RESISTANCE DECADE LAST DIGIT - 2322 242 refers to VR37 100 k to 976 k 4 - 2322 244 refers to VR68 1 M to 9.
PAGE 10
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