VRM
Vishay Foil Resistors
Bulk Metal® Foil Technology
Industrial Miniature Precision Resistors
FEATURES
• Temperature Coefficient of Resistance:
± 4ppm/°C (0°C to + 60°C); ± 8ppm/°C (– 55°C to + 125°C)
(TCR to ± 5ppm/°C ,– 55°C to + 125°C available.)
• Resistance Range: 5Ω to 50KΩ
Product may not
be to scale
• Tolerance:
5Ω to < 50Ω: ± 0.1%, ± 0.25%, ± 0.5%, ± 1.0%
50Ω to 50KΩ: ± 0.01%, ± 0.02%, ± 0.05%, ± 0.1%,
± 0.25%, ± 0.5%, ± 1.0%
• Power Rating: 0.25 W @ + 70°C; 0.125 W @ + 125°C
• Non Inductive: < 0.08µH
The VRM style is a miniaturized version of the now famous
S102C. It is made with a foil element so it retains all of the
inherent performance of foil resistors. It does not, however,
have the value range, power rating, TCR or lead spacing of
the S102C. It is a size for size replacement for certain
wirewounds and finds application in situations where size
constraints dictate the use of this miniature precision resistor.
FIGURE 1 - IMPRINTING AND DIMENSIONS
Model
VISHAY
XXXX
VRM
• Long Term Stability: 0.0025% (25ppm) per year under
low power and room temperature conditions
• Voltage Coefficient: < 0.1ppm/V
• Maximum Working Voltage: 250 volts
• Shelf Life: 0.0025% (25ppm) per year
FIGURE 2 - POWER DERATING CURVE
Rear View
Resistance
Value Code
W
100R01
0.01%
H
Percent of Rated Power
Front View
Date Code
01
10
Year Week
L
• Thermal EMF: < 0.1µV/°C
Tolerance
ST
+70°C
+ 75
+ 50
+ 25
0
–25
DIMENSIONS
Lead Material
#22 AWG (0.025 Dia)
Solder Coated Copper
0
+25
+50
+75 +100 +125 +150 +175
Ambient Temperature (°C)
LL
LS
+155°C
+ 100
TABLE 1 - ORDERING INFORMATION
INCHES
mm
L:
0.250 ± 0.010
6.35 ± 0.25
H:
0.250 ± 0.010
6.35 ± 0.25
W:
0.125 ± 0.010
3.18 ± 0.25
ST:
0.020 ± 0.010
0.508 ± 0.25
LL:
0.750 Min
19.05 Min
LS:
0.125 ± 0.005
3.18 ± 0.13
Please specify Vishay “VRM” Series as follows:
Example:
VRM
100R01
0.1%
MODEL NO. RESISTANCE VALUE TOLERANCE
Resistance Value, in ohms, is expressed by a series of 6
characters, 5 of which represent significant digits while the 6th is a
dual purpose letter that designates both the multiplier and the
location of the comma or decimal.
RESISTANCE
RANGE
5Ω to <1KΩ
1KΩ to 50KΩ
LETTER
MULTIPLIER
DESIGNATOR
FACTOR
EXAMPLE
R
x1
100R01 = 100.01Ω
15K231 = 15,231Ω
K
x103
SALES
• ISRAEL: foilsales.israel@vishay.com
• FRANCE/SWITZERLAND/SOUTHERN EUROPE: foilsales.eusouth@vishay.com
• AMERICAS: foilsales.usa@vishay.com
• ASIA/JAPAN: foilsales.asia@vishay.com • UK/HOLLAND/SCANDINAVIA: foilsales.eunorth@vishay.com • GERMANY/CZECH REPUBLIC/AUSTRIA: foilsales.eucentral@vishay.com
For technical questions in the Americas, contact foilsupport1@vishay.com
Document Number: 63010
For technical questions in Asia/Japan/Europe/Africa/Israel, contact foilsupport2@vishay.com
Revision 01-Mar-05
www.vishay.com
137
THROUGH HOLE
• Load Life Stability: ± 0.05% Maximum ∆R @ rated power
and temperature for 2,000 hrs.
Legal Disclaimer Notice
Vishay
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc.,
or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, by
estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's
terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express
or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness
for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify Vishay for any damages resulting from such improper use or sale.
Document Number: 91000
Revision: 08-Apr-05
www.vishay.com
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