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VRM
Vishay Foil Resistors
Bulk Metal(R) 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 to 50 k * 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(R) 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 R at + 70 C at Rated Power for 2000 hours * Non Inductive: < 0.08 H * Thermal EMF: < 0.1 V/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@vishay.com * For better performances, please see S-Series datasheet
Pb-free Available
RoHS*
COMPLIANT
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 to 50 50 to 50 k 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: 12-Jul-07 For any questions, contact: foil@vishay.com www.vishay.com 1
VRM
Vishay Foil Resistors Bulk Metal(R) Foil Technology Industrial Miniature Precision
Resistor with TCR of 4 ppm/C and Tolerance to 0.01 %
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
R 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= K = k 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 k 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 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 * For non-standard requests, please contact Application Engineering.
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For any questions, contact: foil@vishay.com
Document Number: 63010 Revision: 12-Jul-07
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, "Vishay"), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein or in any other disclosure relating to any product. Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay's terms and conditions of purchase, including but not limited to the warranty expressed therein, which apply to these products. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting from such use or sale. Please contact authorized Vishay 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 Number: 91000 Revision: 18-Jul-08
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