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SMR SMV

The SMR and SMV resistors are precision current sensing resistors designed for harsh environments like automotive applications. They use etched manganin foil laminated to a copper lead frame for efficient heat sinking and provide low temperature coefficient of resistance and long-term stability under load. The SMV features a true Kelvin four-terminal connection for highest precision low-Ohmic current sensing. Both models are packaged in tape and compatible with surface mount processes.

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Adlan Messaoud
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31 views1 page

SMR SMV

The SMR and SMV resistors are precision current sensing resistors designed for harsh environments like automotive applications. They use etched manganin foil laminated to a copper lead frame for efficient heat sinking and provide low temperature coefficient of resistance and long-term stability under load. The SMV features a true Kelvin four-terminal connection for highest precision low-Ohmic current sensing. Both models are packaged in tape and compatible with surface mount processes.

Uploaded by

Adlan Messaoud
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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SMR, SMV ISOTEK

C O R P O R AT I O N

Precision Current Sensing Resistors


SMR / SMV
9.1

Sense Terminal (2 plcs.)


(SMV only)
0.4

1.55 1.15

12.0

1.0 10.0 1.0


The SMR and SMV resistors are designed for precision current
sensing in harsh environments. The molded package make them
ideal for use in automotive applications. The SMV is a true Kelvin 3.4
2.1
(four terminal) connection for the highest precision low-Ohmic current
sensing.
2.0 8.0 2.0
Both models use etched manganin foil laminated to a copper lead
frame which serves as an efficient heat sink. The manganin provides
for low tcr and long term stability under load.
3.6 1 5.4
The SMR and SMV resistors are packaged in 24mm tape (EIA-481) sense terminal (SMV only)
and are compatible with all surface mount processes.

6.0 5.0
Percent of Rated Power

100

75 Top View sense terminal (SMV only)

5.4 1 3.6
50

25
1.8
0 20 40 60 80 100 120
Terminal Temperature (°C) 1.5

5.8
I1 I2 9.9

SMR-R100-1.0
2.8
Tolerance
Resistance value S1 S2
Model 6.4

12.8

Proposed pcb layout for


kelvin (SMV) connection Dimensions in millimeters

Technical Data

Parameters SMR SMV


Resistance Range 0 Ω, 5 mΩ to 4.7 Ω 1 mΩ to 1 Ω
Tolerance 0.5%, 1.0%, 5.0% 0.5%, 1.0%, 5.0%
Temperature Coefficient of Resistance (20°C to 60°C) < 50 ppm/°C < 30 ppm/°C
Power Rating (Watts) 3W 3W
Dielectric Withstanding Voltage 1000 VAC 1000 VAC
Inductance < 10 nH < 10 nH
Thermal Resistance (foil/terminals) Rth < 15°C/W Rth < 15°C/W
Operating Temperature Range -55°C to +140°C -55°C to +140°C
Stability (Nominal Load at 80°C) < 0.5% after 2000 hours < 0.5% after 2000 hours

http://www.isotekcorp.com tekinfo@isotekcorp.com phone 508-673-2900 fax 508-676-0885

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