VRM
Vishay Foil Resistors
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 50 kΩ
•
Tolerance: to ± 0.01 %
•
Power Rating: 0.25 W at + 70 °C; 0.125 W at + 125 °C
Any value at any tolerance available with resistance range
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 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.
Our Application Engineering Department is available to
advise and to make recommendations. For non-standard
technical requirements and special applications, please
contact us.
•
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: 250 V
•
Terminal Finishes Available: Lead (Pb)-free
Tin/Lead Alloy
•
Any value available within resistance range (e.g. 1K234)
•
Prototype samples available from 48 hours. For more
information, 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
VISHA
Y
XXXX
VRM
Rear View
FIGURE 2 - POWER DERATING CURVE
Percent of Rated Power
+ 70 °C
+ 100
+ 75
+ 50
+ 25
0
- 55 - 25
+ 155 °C
W
100R01
0.01
%
Resistance
Value Code
Model
ST
H
Tolerance
0
+ 25 + 50
+ 75 + 100 + 125 + 150 + 175
LL
LS
Lead Material
#22 AWG (0.025 Dia)
Solder Coated Copper
Ambient Temperature (°C)
DIMENSIONS
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
mm
6.35 ± 0.25
6.35 ± 0.25
3.18 ± 0.25
0.51 ± 0.25
19.05 Minimum
3.18 ± 0.13
TABLE 1 - RESISTANCE VALUES VS
TOLERANCE
5
Ω
to 50
Ω
50
Ω
to 50 kΩ
± 0.01 %
± 0.02 %
± 0.05 %
± 0.1 %
± 0.25 %
± 0.5 %
± 1.0 %
± 0.1 %
± 0.25 %
± 0.5 %
± 1.0 %
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 63010
Revision: 23-Mar-10
For any questions, contact:
foil@vishaypg.com
www.foilresistors.com
1
VRM
Vishay Foil Resistors
FIGURE 3 - TEMPERATURE COEFFICIENT
FIGURE 4 - TRIMMING TO VALUES
(Conceptual Illustration)
+ 400
+ 200
+ 100
Interloop Capacitance
Reduction in Series
Current Path
Before Trimming
Current Path
After Trimming
Trimming Process
Removes this Material
from Shorting Strip Area
Changing Current Path
and Increasing
Resistance
+ 4 ppm/°C
ΔR
R
0
(ppm)
- 100
- 200
- 400
+ 140
- 4 ppm/°C
- 140
Mutual Inductance
Reduction due
to Change in
Current Direction
0
+ 25
+ 60
Temperature, °C
Note:
Foil shown in
black,
etched spaces in
white
TABLE 2 - GLOBAL PART NUMBER INFORMATION
NEW GLOBAL PART NUMBER: Y007345K4540Q9L (preferred part number format)
DENOTES PRECISION
Y
VALUE
R
=
Ω
K
= kΩ
AER*
0
= Standard
9
= Lead (Pb)-free
1 - 999
= Custom
Y
0
0
7
3
4
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 %
PACKAGING
L
= Bulk Pack
FOR EXAMPLE: ABOVE GLOBAL ORDER Y0073 45K4540 Q 9 L:
TYPE: VRM
VALUE: 45.454 kΩ
ABSOLUTE TOLERANCE: ± 0.02 %
TERMINATION: Lead (Pb)-free
PACKAGING: Bulk Pack
HISTORICAL PART NUMBER EXAMPLE: VRMT 45K454 Q B (will continue to be used)
VRM
MODEL
VRM
T
TERMINATION
T
= Lead (Pb)-free
None = Tin/Lead alloy
45K454
OHMIC VALUE
45.454 kΩ
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
* For non-standard requests, please contact Application Engineering.
www.foilresistors.com
2
For any questions, contact:
foil@vishaypg.com
Document Number: 63010
Revision: 23-Mar-10
Legal Disclaimer Notice
Vishay Precision Group
Disclaimer
ALL PRODUCTS, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE.
Vishay Precision Group, Inc., its affiliates, agents, and employees, and all persons acting on its or their
behalf (collectively, “Vishay Precision Group”), disclaim any and all liability for any errors, inaccuracies or
incompleteness contained herein or in any other disclosure relating to any product.
The product specifications do not expand or otherwise modify Vishay Precision Group’s terms and
conditions of purchase, including but not limited to, the warranty expressed therein.
Vishay Precision Group makes no warranty, representation or guarantee other than as set forth in the terms
and conditions of purchase.
To the maximum extent permitted by applicable law, Vishay Precision
Group disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and
all liability, including without limitation special, consequential or incidental damages, and (iii) any and
all implied warranties, including warranties of fitness for particular purpose, non-infringement and
merchantability.
Information provided in datasheets and/or specifications may vary from actual results in different
applications and performance may vary over time. Statements regarding the suitability of products for
certain types of applications are based on Vishay Precision Group’s knowledge of typical requirements that
are often placed on Vishay Precision Group products. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular
application.
No license, express, implied, or otherwise, to any intellectual property rights is granted by this document, or
by any conduct of Vishay Precision Group.
The products shown herein are not designed for use in life-saving or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay Precision Group products not expressly
indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay
Precision Group for any damages arising or resulting from such use or sale. Please contact authorized
Vishay Precision Group personnel to obtain written terms and conditions regarding products designed for
such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document No.: 63999
Revision: 27-Apr-2011
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1
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