ERJ-M1WSJ5M0U Equivalent & Substitute Parts

Part Overview

The ERJ-M1WSJ5M0U is a 5 mOhms ±5% 1W chip resistor in 2512 (6432 Metric) package manufactured by Panasonic Electronic Components. This metal element current sense resistor operates across -55°C to 170°C with a temperature coefficient of ±100ppm/°C. The product is obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Resistance	5 mOhms
Tolerance	±5%
Power Rating	1W
Package / Case	2512 (6432 Metric)
Composition	Metal Element
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C ~ 170°C
Features	Current Sense
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the ERJ-M1WSJ5M0U are selected based on the following core parameters that determine functional compatibility:

Resistance value: 5 mOhms (exact match required)
Package / Case: 2512 (6432 Metric) (exact match required)
Composition: Metal Element (exact match required)
Temperature Coefficient: ±100ppm/°C (exact match required)
Operating Temperature Range: -55°C ~ 170°C (exact match required)
Features: Current Sense (exact match required)

Substitutes are grouped by tolerance and power rating variations. All substitute parts are manufactured by YAGEO from the PA_E series and maintain active product status with AEC-Q200 automotive qualification and moisture-resistant properties.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Operating Temp	Product Status	RoHS
ERJ-M1WSJ5M0U	Panasonic	5 mOhms	±5%	1W	2512	±100ppm/°C	-55°C ~ 170°C	Obsolete	ROHS3
PA2512FKF070R005E	YAGEO	5 mOhms	±1%	1W	2512	±100ppm/°C	-55°C ~ 170°C	Active	ROHS3
PA2512FKF7T0R005E	YAGEO	5 mOhms	±1%	3W	2512	±100ppm/°C	-55°C ~ 170°C	Active	ROHS3
PA2512FKF7W0R005E	YAGEO	5 mOhms	±1%	2W	2512	±100ppm/°C	-55°C ~ 170°C	Active	ROHS3
PA2512JKF070R005E	YAGEO	5 mOhms	±5%	1W	2512	±100ppm/°C	-55°C ~ 170°C	Active	ROHS3
PA2512JKF7T0R005E	YAGEO	5 mOhms	±5%	3W	2512	±100ppm/°C	-55°C ~ 170°C	Active	ROHS3
PA2512JKF7W0R005E	YAGEO	5 mOhms	±5%	2W	2512	±100ppm/°C	-55°C ~ 170°C	Active	ROHS3

Engineering Selection Recommendations

All YAGEO PA_E series substitutes maintain electrical and thermal equivalence to the ERJ-M1WSJ5M0U across the specified operating range. Selection between substitute parts depends on application requirements:

For direct replacement with identical specifications, PA2512JKF070R005E provides the closest match with ±5% tolerance and 1W power rating while maintaining active product status.

For applications requiring improved tolerance performance, PA2512FKF070R005E offers ±1% tolerance at 1W power rating.

For applications with higher thermal dissipation requirements, PA2512FKF7T0R005E (3W) and PA2512JKF7T0R005E (3W) provide increased power handling capability.

All substitute parts carry AEC-Q200 automotive qualification, ROHS3 compliance, and moisture-resistant metal element construction. Operating temperature range, temperature coefficient, and package dimensions remain consistent across all substitutes.

Frequently Asked Questions (FAQ)

Q: Can PA2512JKF070R005E directly replace ERJ-M1WSJ5M0U?

A: Yes. Both parts share identical resistance (5 mOhms), tolerance (±5%), power rating (1W), package (2512), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C ~ 170°C). PA2512JKF070R005E is active and available.

Q: What is the difference between ±1% and ±5% tolerance substitutes?

A: Tolerance defines the maximum deviation from the nominal 5 mOhm resistance value. ±1% tolerance parts (PA2512FKF series) maintain tighter resistance accuracy, while ±5% tolerance parts (PA2512JKF series) match the original specification. Selection depends on circuit accuracy requirements.

Q: Can I use a 2W or 3W rated substitute in place of the 1W original?

A: Yes. Higher power-rated parts (2W and 3W) are electrically equivalent and physically compatible in the same 2512 package footprint. They provide additional thermal margin for applications with higher current dissipation.

Q: Are all substitutes automotive qualified?

A: Yes. All YAGEO PA_E series substitutes carry AEC-Q200 automotive qualification, exceeding the original Panasonic part's certification level.

Q: What is the physical size difference between the original and substitutes?

A: The original ERJ-M1WSJ5M0U measures 0.252" L x 0.126" W (6.40mm x 3.20mm) with 0.043" max height. YAGEO substitutes measure 0.250" L x 0.125" W (6.35mm x 3.18mm) with 0.035" max height. Both fit the same 2512 package footprint with negligible dimensional variation.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

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