CSR25120R1F Equivalent & Substitute Parts

Part Overview

The CSR25120R1F is a 100 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 applications requiring low resistance values with tight tolerance specifications. The part is classified as Obsolete, necessitating identification of suitable alternatives for ongoing production and maintenance requirements. Substitute parts must maintain electrical equivalence in resistance value, tolerance, and package form factor while meeting current availability and compliance standards.

Substiute Parts

CSR25120R1F

RiedonIn Stock: 922CSR25120R1F Datasheet

Current PartRFQ

CSRL3-0R1F2

RiedonIn Stock: 10262CSRL3-0R1F2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CSR25120R1F is determined by the following critical parameters:

• Resistance Value: Must be 100 mOhms ±1%
• Package Form Factor: Must be 2512 (6432 Metric) with compatible physical dimensions
• Composition & Features: Must maintain Metal Element construction with current sense and non-inductive characteristics
• Operating Temperature Range: Must support -55°C to 170°C minimum
• Compliance Standards: Must maintain ROHS3 compliance and MSL 1 rating

The CSRL3-0R1F2 qualifies as a direct substitute based on matching resistance, tolerance, package, composition, and operating temperature specifications. The increased power rating (3W versus 1W) represents an uprated alternative suitable for applications where the original 1W specification may be exceeded, while maintaining all other electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

The CSRL3-0R1F2 is the qualified substitute for the obsolete CSR25120R1F. Both parts are manufactured by Riedon and maintain identical electrical specifications for resistance value, tolerance, and operating temperature range. The substitute part is currently in active production status with substantial inventory availability (10,213 pieces), ensuring supply chain continuity.

The CSRL3-0R1F2 features a 3W power rating compared to the original 1W specification. This uprated power capability provides enhanced thermal margin in current sense applications without compromising electrical performance. Physical dimensions are nominally equivalent within standard manufacturing tolerances for the 2512 package form factor.

Both parts maintain ROHS3 compliance and MSL 1 rating, satisfying regulatory and environmental requirements. The substitute part is suitable for direct replacement in applications where the original CSR25120R1F was specified, provided the circuit design accommodates the increased power rating capability.

Frequently Asked Questions (FAQ)

Q: Can the CSRL3-0R1F2 be used as a direct replacement for the CSR25120R1F?

A: Yes. The CSRL3-0R1F2 maintains identical resistance value (100 mOhms), tolerance (±1%), package form factor (2512), composition (Metal Element), and operating temperature range (-55°C to 170°C). The increased power rating (3W) does not prevent substitution and provides additional thermal capability.

Q: What is the significance of the power rating difference between 1W and 3W?

A: The power rating indicates the maximum continuous power dissipation capability. The CSRL3-0R1F2 can safely dissipate up to 3W, compared to 1W for the original part. In current sense applications, this provides greater thermal margin and reduces junction temperature rise under load.

Q: Are the physical dimensions compatible for PCB layout?

A: Yes. Both parts use the 2512 (6432 Metric) package with maximum seated height of 0.035" (0.90mm). Dimensional variations between parts (0.250" vs 0.252" length, 0.125" vs 0.126" width) fall within standard manufacturing tolerances for this package class and do not affect PCB footprint compatibility.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the CSR25120R1F and CSRL3-0R1F2 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Both are REACH Unaffected and classified under ECCN EAR99.

Q: Why is the original part classified as Obsolete?

A: The CSR25120R1F is no longer in active production. The CSRL3-0R1F2 from the same manufacturer serves as the active production alternative, offering equivalent electrical performance with improved availability and supply chain support.