VRM
Bulk Metal
®
Foil Technology Industrial Miniature Precision Resistor
Bulk Metal® Foil Technology Industrial Miniature Precision Resistor
with TCR of ±4 ppm/°C and Tolerance to ±0.01%
FEATURES
• Temperature coefficient of resistance:
±4 ppm/°C (0°C to +60°C);
±8 ppm/°C (–55°C to +125°C, 25°C Ref.)
• Resistance range: 5 Ω to 30 kΩ
• Tolerance: to ±0.01%
• Power rating:
❍❍
from 5Ω to 10 kΩ: 0.25 W at 70°C and 0.125 W at
125°C
❍❍
from above 10 kΩ to 30 kΩ: 0.16 W at 70°C and
0.08 W at 125°C
• Load life stability: ±0.05% maximum ΔR at +70°C
at rated power for 2000 hours
• Non inductive: <0.08 µH
• Thermal EMF: <0.1 µV/°C
• Long term stability: ±0.0025% (25 ppm) per year under
low power and room temperature conditions
• Voltage coefficient: <0.1 ppm/V
• Maximum working voltage: 69 V
• Terminal finishes available:
Lead (Pb)-free; tin/lead alloy
• Any 6-digit value available within resistance range
(e.g., 1K23456)
• Prototype samples available. Please contact:
foil@vishaypg.com
• For better performances, please see S-Series datasheet
Figure 1 – Imprinting and Dimensions
Front View
Date Code
07
10
Year Week
L
Model
ST
LL
LS
Lead Material
#22 AWG (0.025 Dia)
Solder Coated Copper
VFR
XXXX
VRM
H
Rear View
Resistance
Value Code
100R01
0.01%
Tolerance
W
DIMENSION
L
H
W
ST
LL
LS
INCHES
0.250±0.010
0.250±0.010
0.125±0.010
0.020±0.010
0.750 Minimum
0.125±0.005
MILLILITERS
6.35±0.25
6.35±0.25
3.18±0.25
0.51±0.25
19.05 Minimum
3.18 ±0.13
INTRODUCTION
Any 6-digit value available within the resistance range
with tight tolerances (to 0.01%).
The VRM style is a miniaturized version of the now
famous S102C. It is made with a Bulk Metal
®
Foil
element so it retains all of the inherent performance of
foil resistors. It does not, however, have the value range,
power rating, TCR orlead 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.
Our Application Engineering Department is available to
advise and to make recommendations.
For non-standard technical requirements and special
applications, please contact us.
Figure 2 – Power Derating Curve
Percent of Rated Power
+100
+75
+50
+25
0
– 55
– 25
0
+25
+50
+75
+100 +125 +150 +175
+70°C
+155°C
Ambient Temperature (°C)
Notes
* This datasheet provides information about parts that are RoHS-compliant and/or parts that are non-RoHS-compliant. For example,
parts with lead (Pb) terminations are not RoHS compliant. Please see the information/tables in this datasheet for details.
Document No.: 63010
Revision: 08-Jan-2018
For any questions, contact
foil@vpgsensors.com
www.vishayfoilresistors.com
1
VRM
Table 1 – Resistance Values vs. Tolerance
5 Ω to 50 Ω
±0.1%
±0.25%
±0.5%
±1.0%
50 Ω to 30 kΩ
±0.01%
±0.02%
±0.05%
±0.1%
±0.25%
±0.5%
±1.0%
Figure 4 – Trimming to Values
Interloop
capacitance
reduction
in series
Mutual
inductance
reduction
due to change
in current
direction
Current path
before trimming
Current path after trimming
Figure 3 – Temperature Coefficient
+400
+200
+100
+4 ppm/°C
R
R
0
(ppm)
–
100
–
200
–
400
+140
–
4 ppm/°C
–
140
Note
To acquire a precision resistance value, the Bulk Metal
®
Foil
chip is trimmed by selectively removing built-in “shorting bars.”
To increase the resistance in known increments, marked
areas are cut, producing progressively smaller increases in
resistance. This method reduces the effect of “hot spots” and
improves the long-term stability of Bulk Metal
®
Foil resistors.
Trimming process
removes this material
from shorting strip area
changing current path
and increasing
resistance
Foil shown in black, etched spaces in white
0
Temperature, °C
+25
+60
Table 2 – Global Part Number Information
NEW GLOBAL PART NUMBER: Y007325K4540Q9L (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
K
=k
TERMINAL/CHARACTERISTIC
0
= Standard
9
= Lead (Pb)-free
1 - 999
= Custom*
Y
0
0
7
3
2
5
K
4
5
4
0
Q
9
L
PRODUCT CODE
0073
= VRM
RESISTANCE TOLERANCE
T
= ±0.01%
Q
= ±0.02%
A
= ±0.05%
B
= ±0.1%
C
= ±0.25%
D
= ±0.5%
F
= ±1.0%
L
= Bulk Pack
PACKAGING
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0073 25K4540 Q 9 L:
TYPE: VRM
VALUE: 25.454 k
ABSOLUTE TOLERANCE: ±0.02%
TERMINATION: Lead (Pb)-free
PACKAGING: Bulk Pack
VR M
MODEL
VRM
HISTORICAL PART NUMBER EXAMPLE: VRMT 25K454 Q B (will continue to be used)
T
TERMINATION
T
= Lead (Pb)-free
None = Tin/Lead alloy
25K454
OHMIC VALUE
45.454 k
Q
RESISTANCE
TOLERANCE
T
= ±0.01%
Q
= ±0.02%
A
= ±0.05%
B
= ±0.1%
C
= ±0.25%
D
= ±0.5%
F
= ±1.0%
B
PACKAGING
B
= Bulk Pack
Note
* Customizations are available; contact Application Engineering at foil@vpgsensors.com.
www.vishayfoilresistors.com
2
For any questions, contact
foil@vpgsensors.com
Document No.: 63010
Revision: 08-Jan-2018
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Vishay Precision Group, Inc.
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Copyright Vishay Precision Group, Inc., 2014. All rights reserved.
Document No.: 63999
Revision: 15-Jul-2014
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