Current Shunt Resistor Datasheet
© 2023 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 11/07/23
1
Two-Terminal, Metal Type Current Shunt Resistor
SSA Series
Littelfuse SSA Series is a two-terminal, ultra-low resistance shunt
resistor which are of suprior quality. They are best suited for
applications including power hybrid applications, frequency
converters, power modules, and communication systems.
Description
■ English case sizes 2512,
3921, and 5931
■ Resistance from
0.2 mΩ~4 mΩ
■ Power up to 15 W
■ Tolerance down to ±1.0%
■ TCR down to ±50 ppm/°C
■ Small size
■ High voltage
■ Halogen-free, lead-free and
RoHS compliant
Features & Benefits
■ Power Hybrid Application
■ Frequency Converter
■ Power Module
■ Communication System
Application
RoHS
Pb
Resources Accessories Samples
Additional Information
Electrical Specifications
Part number
Size Resitance Value Power (70˚C) Power (100˚C)
TCR (ppm/˚C)
Standard
package Qty
inch mm Ro (mΩ) Rt (%) W W
SSA2512L0M20FPR 2512 6432 0.2 ±1.0% 6 4 ±200 2000
SSA2512L0M25FPR 2512 6432 0.25 ±1.0% 5 3 ±175 2000
SSA2512L0M30FPR 2512 6432 0.3 ±1.0% 5 4 ±175 2000
SSA2512L0M50FWR 2512 6432 0.5 ±1.0% 6 4 ±150 3000
SSA2512LR001FWR 2512 6432 1 ±1.0% 6 4 ±100 3000
SSA2512LR002FWR 2512 6432 2 ±1.0% 6 4 ±50 3000
SSA2512LR003FWR 2512 6432 3 ±1.0% 4 3 ±50 3000
SSA2512LR004FWR 2512 6432 4 ±1.0% 4 2 ±50 3000
SSA2512L0M20JPR 2512 6432 0.2 ±5.0% 6 4 ±200 2000
SSA2512L0M25JPR 2512 6432 0.25 ±5.0% 5 3 ±175 2000
SSA2512L0M30JPR 2512 6432 0.3 ±5.0% 5 4 ±175 2000
SSA2512L0M50JWR 2512 6432 0.5 ±5.0% 6 4 ±150 3000
SSA2512LR001JWR 2512 6432 1 ±5.0% 6 4 ±100 3000
SSA2512LR002JWR 2512 6432 2 ±5.0% 6 4 ±50 3000
SSA2512LR003JWR 2512 6432 3 ±5.0% 4 3 ±50 3000
SSA2512LR004JWR 2512 6432 4 ±5.0% 4 2 ±50 3000
SSA3921L0M20FWR 3921 50110 0.2 ±1.0% 9 5 ±150 3000
SSA3921L0M30FWR 3921 50110 0.3 ±1.0% 10 5 ±150 3000
SSA3921L0M50FWR 3921 50110 0.5 ±1.0% 9 5 ±70 3000
SSA3921L0M75FWR 3921 50110 0.75 ±1.0% 8 5 ±70 3000
SSA3921LR001FWR 3921 50110 1 ±1.0% 7 4 ±50 3000
SSA3921LR002FWR 3921 50110 2 ±1.0% 6 4 ±50 3000
SSA3921LR003FWR 3921 50110 3 ±1.0% 6 3 ±50 3000
SSA3921LR004FWR 3921 50110 4 ±1.0% 5 2,5 ±50 3000
SSA3921L0M20JWR 3921 50110 0.2 ±5.0% 9 5 ±150 3000
SSA3921L0M30JWR 3921 50110 0.3 ±5.0% 10 5 ±150 3000
SSA3921L0M50JWR 3921 50110 0.5 ±5.0% 9 5 ±70 3000
SSA3921L0M75JWR 3921 50110 0.75 ±5.0% 8 5 ±70 3000
Current Shunt Resistor Datasheet
© 2023 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 11/07/23
2
Two-Terminal, Metal Type Current Shunt Resistor
SSA Series
Electrical Specifications
Temperature De-rating Curves
Storage / Environment Conditions
Products should be stored under the following environmental conditions.
Temperature: +5 to +35 °C
Humidity: 45 to 85% relative humidity
Moisture Sensitivity Level 1, J-STD-020
Do not keep products in environments where they may be subject
to particulate contamination or harmful gases such as sulfuric acid or
hydrogen chloride as it may cause oxidization on electrodes, resulting poor
solderability.
Products should be stored in a space that does not expose to high
temperatures, vibration, or direct sunlight.
Products should be stored in the original airtight packaging
until use.
-55 0
0
20
40
60
80
100
40
Ambient Temperature (ºC)
Rated Power (%)
70 80 120 160 170 200
-55 0
0
20
40
60
80
100
40
Ambient Temperature (ºC)
Rated Power (%)
10080 120 160 170
Terminal Temperature at 70°C
Terminal Temperature at 100°C
Part number
Size Resitance Value Power (70˚C) Power (100˚C)
TCR (ppm/˚C)
Standard
package Qty
inch mm Ro (mΩ) Rt (%) W W
SSA3921LR001JWR 3921 50110 1 ±5.0% 7 4 ±50 3000
SSA3921LR002JWR 3921 50110 2 ±5.0% 6 4 ±50 3000
SSA3921LR003JWR 3921 50110 3 ±5.0% 6 3 ±50 3000
SSA5931L0M20FDR 5931 75150 0.2 ±1.0% 15 10 ±125 1500
SSA5931L0M30FDR 5931 75150 0.3 ±1.0% 10 7 ±100 1500
SSA5931L0M50FDR 5931 75150 0.5 ±1.0% 8 6 ±100 1500
SSA5931L0M70FDR 5931 75150 0.7 ±1.0% 7 4 ±100 1500
SSA5931L0M75FDR 5931 75150 0.75 ±1.0% 7 4 ±100 1500
SSA5931LR001FDR 5931 75150 1 ±1.0% 10 7 ±50 1500
SSA5931LR002FDR 5931 75150 2 ±1.0% 8 6 ±50 1500
SSA5931LR003FDR 5931 75150 3 ±1.0% 7 4 ±50 1500
SSA5931L0M20JDR 5931 75150 0.2 ±5.0% 15 10 ±125 1500
SSA5931L0M30JDR 5931 75150 0.3 ±5.0% 10 7 ±10 0 1500
SSA5931L0M50JDR 5931 75150 0.5 ±5.0% 8 6 ±10 0 1500
SSA5931L0M70JDR 5931 75150 0.7 ±5.0% 7 4 ±10 0 1500
SSA5931L0M75JDR 5931 75150 0.75 ±5.0% 7 4 ±100 1500
SSA5931LR001JDR 5931 75150 1 ±5.0% 10 7 ±50 1500
SSA5931LR002JDR 5931 75150 2 ±5.0% 8 6 ±50 1500
SSA5931LR003JDR 5931 75150 3 ±5.0% 7 4 ±50 1500