ERJ-M1WSJ20MU Equivalent & Substitute Parts

Part Overview

The ERJ-M1WSJ20MU is a 20 mOhms ±5% 1W chip resistor manufactured by Panasonic Electronic Components in the 2512 (6432 Metric) package. This component is classified as a current sense metal element resistor designed for precision measurement applications. The part is currently listed as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement planning.

Substiute Parts

ERJ-M1WSJ20MU

Panasonic Electronic ComponentsIn Stock: 810ERJ-M1WSJ20MU Datasheet

Current PartRFQ

PF2512FKF070R02L

YAGEOIn Stock: 52421PF2512FKF070R02L Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ERJ-M1WSJ20MU is determined by the following critical parameters:

• Resistance Value: Must be 20 mOhms
• Power Rating: Must be 1W minimum
• Package Type: Must be 2512 (6432 Metric)
• Temperature Coefficient: Must be ±100ppm/°C or better
• Operating Temperature Range: Must support -55°C minimum and 170°C maximum, or equivalent thermal envelope
• Regulatory Compliance: Must maintain ROHS3 compliance and REACH unaffected status

The PF2512FKF070R02L from YAGEO meets these core substitution criteria while offering improved tolerance (±1% versus ±5%) and active product status.

Parameter Comparison

Engineering Selection Recommendations

The PF2512FKF070R02L is a direct functional substitute for the ERJ-M1WSJ20MU based on matching resistance, power rating, package type, and temperature coefficient specifications. The substitute component offers superior tolerance performance (±1% versus ±5%), which provides tighter resistance accuracy for current sense applications.

Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment. The substitute part is currently in active production with substantial inventory availability (52,400 pcs), whereas the original part is obsolete with limited stock (724 pcs).

The operating temperature range of the substitute extends to 155°C maximum versus 170°C for the original part. Applications requiring operation above 155°C must evaluate thermal requirements against the substitute's specified envelope.

Frequently Asked Questions (FAQ)

Q: Can the PF2512FKF070R02L replace the ERJ-M1WSJ20MU in existing designs?

A: Yes. Both components share identical resistance value (20 mOhms), power rating (1W), package type (2512), and temperature coefficient (±100ppm/°C). The substitute offers improved tolerance and active product status.

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

A: The original uses metal element construction while the substitute uses metal foil. Both compositions are suitable for current sense applications at the specified power and resistance levels. The metal foil composition in the substitute includes moisture resistance as an additional feature.

Q: Does the lower maximum operating temperature of the substitute affect compatibility?

A: The substitute operates to 155°C maximum versus 170°C for the original. Applications operating continuously above 155°C require evaluation against the substitute's thermal specifications. Most standard current sense circuits operate well within this range.

Q: Are there packaging differences between these components?

A: Both use the 2512 (6432 Metric) package. Physical dimensions are nearly identical (original: 6.40mm x 3.20mm; substitute: 6.45mm x 3.25mm). Height differs slightly (original: 1.10mm max; substitute: 0.85mm max), which may provide board layout advantages with the substitute.

Q: What is the inventory status for each part?

A: The ERJ-M1WSJ20MU is obsolete with 724 pcs available. The PF2512FKF070R02L is active production with 52,400 pcs in stock, providing superior long-term availability for procurement planning.