CSR25120R04F Equivalent & Substitute Parts

Part Overview

The CSR25120R04F is a 40 mOhms ±1% 1W chip resistor in 2512 (6432 Metric) package manufactured by Riedon. This current sense, non-inductive metal element resistor is designed for precision low-resistance applications requiring tight tolerance and thermal stability. The part is classified as Obsolete, making identification of suitable substitutes essential for ongoing design support and procurement continuity.

Substiute Parts

CSR25120R04F

RiedonIn Stock: 896CSR25120R04F Datasheet

Current PartRFQ

CSRL3-0R04F1

RiedonIn Stock: 1044CSRL3-0R04F1 Datasheet

DirectRFQ

CSRL3-0R04F8

RiedonIn Stock: 7720CSRL3-0R04F8 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CSR25120R04F is determined by the following critical parameters:

• Resistance Value: 40 mOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Package / Case: 2512 (6432 Metric) (exact match required)
• Composition: Metal Element (exact match required)
• Features: Current Sense, Non-Inductive (exact match required)
• Operating Temperature Range: -55°C ~ 170°C (minimum requirement)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

The substitute parts identified (CSRL3-0R04F1 and CSRL3-0R04F8) maintain all critical electrical and mechanical parameters. The primary difference is an increased power rating (3W versus 1W), which represents an upward-compatible substitution suitable for applications where the original 1W rating is sufficient or where additional thermal margin is beneficial.

Parameter Comparison

Engineering Selection Recommendations

Both CSRL3-0R04F1 and CSRL3-0R04F8 are suitable substitutes for the obsolete CSR25120R04F based on electrical and mechanical compatibility. Selection between the two substitute options depends on packaging requirements:

• CSRL3-0R04F1: Supplied in Cut Tape (CT) & Digi-Reel® packaging
• CSRL3-0R04F8: Supplied in Tape & Reel (TR) packaging

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), meeting regulatory and environmental requirements. The increased power rating (3W) of the substitute parts provides thermal margin beyond the original 1W specification while maintaining identical electrical performance at the 40 mOhms resistance value and ±1% tolerance.

Frequently Asked Questions (FAQ)

Q: Can CSRL3-0R04F1 or CSRL3-0R04F8 be used as direct replacements for CSR25120R04F?

A: Yes. Both substitute parts maintain identical resistance (40 mOhms), tolerance (±1%), package (2512), composition (Metal Element), and current sense, non-inductive features. The increased power rating (3W versus 1W) is an upward-compatible change.

Q: What is the difference between CSRL3-0R04F1 and CSRL3-0R04F8?

A: The primary difference is packaging format. CSRL3-0R04F1 is supplied in Cut Tape (CT) & Digi-Reel® packaging, while CSRL3-0R04F8 is supplied in Tape & Reel (TR) packaging. Electrical and mechanical specifications are identical.

Q: Are there any dimensional differences between the main part and substitutes?

A: Minor dimensional variations exist within tolerance. The main part measures 0.250" L x 0.125" W (6.35mm x 3.18mm), while substitutes measure 0.252" L x 0.126" W (6.40mm x 3.20mm). Height remains 0.035" (0.90mm) maximum for all parts. These variations are within standard PCB layout tolerances for 2512 package components.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. Both CSRL3-0R04F1 and CSRL3-0R04F8 are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original part's compliance profile.

Q: Why is the power rating increased in the substitute parts?

A: The CSRL series offers enhanced thermal performance at the same package size. The 3W rating provides additional thermal margin for current sense applications while maintaining the same footprint and electrical characteristics.