VR25
Vishay BCcomponents
High Ohmic/High Voltage Resistors
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”.
TECHNICAL SPECIFICATIONS
DESCRIPTION
Resistance range1)
VALUE
100 kΩ to 22 MΩ
Resistance tolerance and series:
100 kΩ to 15 MΩ
1 ꢀ: E24/E96 series; 5 ꢀ: E24 series
15 MΩ to 22 MΩ
5 ꢀ: E24 series; 10 ꢀ: E12 series
Maximum dissipation at Tamb = 70 °C
Thermal resistance, Rth
Temperature coefficient
Maximum permissible voltage:
DC
0.25 W
140 K/W
200 × 10-6/K
≤
1600 V
1150 V
700 V
RMS
Dielectric withstanding voltage of the insulation for 1 minute
Basic specifications
Climatic category (IEC 60068)
Stability after:
IEC 60115-1B
55/155/56
load (1000 hours)
∆R/R max.: 1.5 ꢀ + 0.1 Ω
∆R/R max.: 1.5 ꢀ + 0.1 Ω
∆R/R max.: 1.5 ꢀ + 0.1 Ω
max. 5 µV/V
accelerated damp heat test (6 days)
long term damp heat test (56 days)
Noise
Note
1. Ohmic values (other than resistance range) are available on request.
12NC INFORMATION
• The resistors have a 12-digit numeric code starting with
2322 241
Last Digit of 12NC Indicating Resistance Decade
RESISTANCE DECADE
LAST DIGIT
• The subsequent:
100 to 976 kΩ
1 to 9.76 MΩ
≥ 10 MΩ
4
5
6
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.
12NC Example
The 12NC for a VR25, resistor value 7.5 MΩ, 5 ꢀ tolerance,
supplied on a bandolier of 1000 units in ammopack, is:
2322 241 13755.
– The last digit indicates the resistance decade.
www.vishay.com
168
For technical questions contact: ff3dresistors@vishay.com
Document Number: 28732
Revision: 06-Dec-05