ERJ-M1WSJ15MU Equivalent & Substitute Parts

Part Overview

The ERJ-M1WSJ15MU is a 15 mOhms ±5% 1W chip resistor in 2512 (6432 Metric) package manufactured by Panasonic Electronic Components. This current sense metal element resistor is designed for precision low-resistance applications requiring stable performance across industrial temperature ranges. The part is classified as obsolete, making substitute components necessary for new designs and ongoing production requirements.

Substiute Parts

ERJ-M1WSJ15MU

Panasonic Electronic ComponentsIn Stock: 1419ERJ-M1WSJ15MU Datasheet

Current PartRFQ

PF2512FKF070R015L

YAGEOIn Stock: 1170PF2512FKF070R015L Datasheet

UpgradeRFQ

PF2512FKF070R015Z

YAGEOIn Stock: 1142PF2512FKF070R015Z Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ERJ-M1WSJ15MU is determined by strict electrical and mechanical compatibility criteria:

Critical Parameters for Substitution:

• Resistance value: 15 mOhms (exact match required)
• Power rating: 1W (exact match required)
• Package: 2512 (6432 Metric) (exact match required)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Operating temperature range: Must support -55°C minimum and 170°C maximum
• Current sense functionality: Required feature
• RoHS3 compliance: Required for regulatory compatibility

Allowable Variations:

• Tolerance: May be tighter (±1% acceptable as upgrade)
• Composition: Metal foil acceptable as upgrade from metal element
• Features: Additional moisture resistance acceptable as upgrade
• Operating temperature maximum: May be lower if minimum of -55°C is maintained

The substitute parts PF2512FKF070R015L and PF2512FKF070R015Z meet all critical parameters with improved tolerance specifications and moisture-resistant metal foil construction.

Parameter Comparison

Engineering Selection Recommendations

PF2512FKF070R015Z (Recommended Primary Substitute)

This part is the preferred substitute for new designs and production. It maintains active product status with YAGEO, ensuring long-term availability and supply chain stability. The ±1% tolerance provides superior accuracy compared to the original ±5% specification. Metal foil construction with moisture resistance offers enhanced reliability. Dimensions are within acceptable mechanical tolerances for 2512 package footprints. Operating temperature range of -55°C to 155°C covers the critical minimum threshold while meeting most industrial applications. ROHS3 compliance and MSL 1 rating ensure regulatory and environmental compatibility.

PF2512FKF070R015L (Secondary Substitute)

This part provides identical electrical specifications to PF2512FKF070R015Z with equivalent performance characteristics. Obsolete product status limits long-term availability. Selection of this part should be based on specific inventory requirements or legacy system compatibility needs.

Operating Temperature Consideration

Both substitute parts specify a maximum operating temperature of 155°C, compared to the original part's 170°C maximum. Applications requiring sustained operation above 155°C require design review to confirm thermal margin adequacy.

Frequently Asked Questions (FAQ)

Q: Can PF2512FKF070R015Z directly replace ERJ-M1WSJ15MU in existing designs?

A: Yes. Both parts share identical resistance (15 mOhms), power rating (1W), package (2512), temperature coefficient (±100ppm/°C), and current sense functionality. Mechanical dimensions are within acceptable tolerance for standard 2512 footprints. The substitute offers improved tolerance (±1% vs ±5%) and moisture resistance as upgrades.

Q: What is the impact of the lower maximum operating temperature (155°C vs 170°C)?

A: The substitute parts operate to 155°C maximum, 15°C lower than the original. Applications with thermal margins below 155°C are unaffected. Designs operating near or above 155°C require thermal analysis to confirm adequate margin remains with the substitute part.

Q: Are the dimensional differences between parts significant?

A: Dimensional variations are minor. The substitute is 0.002" (0.05mm) longer and wider, with 0.010" (0.25mm) lower profile. These differences are within standard PCB footprint tolerances for 2512 packages and do not require layout modifications.

Q: Why is PF2512FKF070R015Z preferred over PF2512FKF070R015L?

A: PF2512FKF070R015Z maintains active product status, ensuring ongoing availability and supply chain support. PF2512FKF070R015L is obsolete, limiting future procurement options.

Q: Do the substitute parts maintain RoHS3 and MSL 1 compliance?

A: Yes. Both substitute parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original part's regulatory and environmental certifications.

Q: What is the tolerance improvement with the substitute parts?

A: The substitute parts provide ±1% tolerance compared to the original ±5%. This tighter tolerance reduces circuit performance variation and improves current sense measurement accuracy in applications requiring precision.