ERJ-M1WSF20MU Equivalent & Substitute Parts

Part Overview

The ERJ-M1WSF20MU is a 20 mOhms ±1% 1W chip resistor manufactured by Panasonic Electronic Components in the 2512 (6432 Metric) package. This current sense metal element resistor is designed for precision low-resistance applications requiring stable performance across industrial temperature ranges. The product is currently obsolete, making identification of functionally equivalent alternatives essential for design continuity and procurement planning.

Substiute Parts

ERJ-M1WSF20MU

Panasonic Electronic ComponentsIn Stock: 7183ERJ-M1WSF20MU Datasheet

Current PartRFQ

PF2512FKF070R02L

YAGEOIn Stock: 52421PF2512FKF070R02L Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ERJ-M1WSF20MU is determined by strict equivalence across the following critical parameters:

• Resistance value: 20 mOhms
• Tolerance: ±1%
• Power rating: 1W
• Package: 2512 (6432 Metric)
• Temperature coefficient: ±100ppm/°C
• Moisture sensitivity level: 1 (Unlimited)
• RoHS3 compliance

The PF2512FKF070R02L manufactured by YAGEO meets all these requirements. While composition differs (metal foil versus metal element) and operating temperature range varies slightly (-55°C ~ 155°C versus -55°C ~ 170°C), the electrical performance and functional characteristics remain equivalent for current sense applications within the specified operating window.

Parameter Comparison

Engineering Selection Recommendations

The PF2512FKF070R02L is the direct functional equivalent for ERJ-M1WSF20MU replacement. Both components satisfy identical electrical specifications: 20 mOhms resistance, ±1% tolerance, 1W power rating, and ±100ppm/°C temperature coefficient in the 2512 package footprint.

The PF2512FKF070R02L offers the advantage of active product status with established supply availability (52,400 pcs in stock versus 7,168 pcs for the obsolete Panasonic part). Both components maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

The operating temperature range difference (-55°C ~ 155°C for YAGEO versus -55°C ~ 170°C for Panasonic) requires evaluation only if applications demand sustained operation above 155°C. For standard industrial and commercial current sense applications within -55°C to 155°C, the YAGEO substitute provides equivalent performance.

Frequently Asked Questions (FAQ)

Q: Can PF2512FKF070R02L be used as a direct replacement for ERJ-M1WSF20MU?

A: Yes. Both components share identical resistance (20 mOhms), tolerance (±1%), power rating (1W), package (2512), and temperature coefficient (±100ppm/°C). Electrical performance is equivalent for current sense applications.

Q: What is the difference between metal element and metal foil composition?

A: Composition differences do not affect the electrical parameters specified for this application. Both achieve the same resistance value, tolerance, and temperature coefficient performance. Metal foil composition in the YAGEO part provides additional moisture resistance as a feature benefit.

Q: Does the operating temperature range difference affect substitution?

A: The YAGEO part operates to 155°C maximum versus 170°C for the Panasonic part. Substitution is valid for applications operating within -55°C to 155°C. Applications requiring sustained operation above 155°C require alternative sourcing.

Q: Are both parts RoHS compliant?

A: Yes. Both ERJ-M1WSF20MU and PF2512FKF070R02L are ROHS3 compliant with unlimited moisture sensitivity (MSL 1).

Q: What packaging options are available for the substitute part?

A: The PF2512FKF070R02L is supplied in Tape & Reel (TR) packaging. Verify packaging requirements for your procurement and assembly process.