High Ohmic/High Voltage Resistors

www.vishay.com

For technical questions contact: ff3dresistors@vishay.com

Document Number: 28732

168

Revision: 06-Dec-05

VR25

Vishay BCcomponents

FEATURES

• High pulse loading capability

• Small size

• Lead (Pb)-free solder contacts

• Pure tin plating provides compatibility with lead (Pb)-free

and lead containing soldering processes

• Compatible with "Restriction of the use of Hazardous

Substances" (RoHS) directive 2002/95/EC (issue 2004)

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

“MIL-STD 202E,

method 215”

and

“IEC 60068-2-45”.

Note

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

TECHNICAL SPECIFICATIONS

DESCRIPTION

VALUE

100 k

Ω to 22 MΩ

Resistance tolerance and series:

100 k

Ω to 15 MΩ

± 1 %: E24/E96 series; ± 5 %: E24 series

15 M

Ω to 22 MΩ

± 5 %: E24 series; ± 10 %: E12 series

0.25 W

140 K/W

Temperature coefficient

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)

∆R/R max.: ± 1.5 % + 0.1 Ω

accelerated damp heat test (6 days)

∆R/R max.: ± 1.5 % + 0.1 Ω

long term damp heat test (56 days)

∆R/R max.: ± 1.5 % + 0.1 Ω

Noise

max. 5 µV/V

12NC INFORMATION

• The resistors have a 12-digit numeric 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 packing.

• 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

12NC Example

The 12NC for a VR25, resistor value 7.5 M

Ω, 5 % tolerance,

supplied on a bandolier of 1000 units in ammopack, is:

2322 241 13755.

RESISTANCE DECADE

LAST DIGIT

100 to 976 k

Ω

4

1to9.76M

Ω

5

≥ 10 MΩ

6