CSR25120R03F Equivalent & Substitute Parts

Part Overview

The CSR25120R03F is a 30 mOhms ±1% 1W chip resistor in 2512 (6432 Metric) package manufactured by Riedon. This current sense, non-inductive metal element resistor operates across -55°C to 170°C and is designed for precision low-resistance applications. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

CSR25120R03F

RiedonIn Stock: 956CSR25120R03F Datasheet

Current PartRFQ

CSRL3-0R03F1

RiedonIn Stock: 893CSRL3-0R03F1 Datasheet

DirectRFQ

CSRL3-0R03F8

RiedonIn Stock: 16919CSRL3-0R03F8 Datasheet

DirectRFQ

PR2512FKE7W0R03Z

YAGEOIn Stock: 4891PR2512FKE7W0R03Z Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CSR25120R03F is determined by the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 30 mOhms
• Tolerance: ±1%
• Package / Case: 2512 (6432 Metric)
• Composition: Metal Element
• Operating temperature range: -55°C ~ 170°C
• RoHS compliance: ROHS3 Compliant

Allowable Variation Parameters:

• Power rating: May be equal to or greater than 1W
• Temperature coefficient: ±50ppm/°C or unspecified
• Features: Current sense capability required; non-inductive feature allowable but not mandatory for substitution

Substitute parts are grouped into two categories:

Direct Substitutes (CSRL3-0R03F1, CSRL3-0R03F8): Riedon CSRL series resistors with identical resistance, tolerance, package, and operating temperature range. Power rating increased to 3W, providing enhanced thermal capability while maintaining full backward compatibility.

Upgrade Substitute (PR2512FKE7W0R03Z): YAGEO PR series resistor with identical electrical specifications. Power rating of 2W exceeds the original 1W requirement. Represents an active product alternative from a different manufacturer.

Parameter Comparison

Engineering Selection Recommendations

CSRL3-0R03F8 (Recommended Primary Substitute): This Riedon part maintains full electrical and mechanical compatibility with the CSR25120R03F while offering increased power dissipation capability (3W vs. 1W). Active product status ensures long-term availability and supply chain stability. Tape & Reel packaging supports high-volume production requirements. Highest inventory availability (16,837 pcs) provides immediate procurement access.

CSRL3-0R03F1 (Alternative Direct Substitute): Identical specifications to CSRL3-0R03F8 with 3W power rating. Cut Tape & Digi-Reel packaging accommodates lower-volume or prototype applications. Active product status confirms ongoing manufacturer support.

PR2512FKE7W0R03Z (Cross-Manufacturer Upgrade): YAGEO PR series provides equivalent electrical performance with 2W power rating. Active product status and ROHS3 compliance ensure regulatory alignment. Selection of this part introduces a secondary manufacturer into the supply chain, suitable for applications requiring dual-source qualification or when Riedon alternatives are unavailable.

All three substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can CSRL3-0R03F8 directly replace CSR25120R03F in existing designs?

A: Yes. Both parts share identical resistance (30 mOhms), tolerance (±1%), package (2512), composition (metal element), and operating temperature range (-55°C ~ 170°C). The increased power rating (3W vs. 1W) provides additional thermal margin without affecting electrical performance or physical fit.

Q: What is the difference between CSRL3-0R03F1 and CSRL3-0R03F8?

A: Both are Riedon CSRL series resistors with identical electrical specifications and 3W power rating. The primary difference is packaging: CSRL3-0R03F1 uses Cut Tape & Digi-Reel format, while CSRL3-0R03F8 uses Tape & Reel format. Selection depends on production volume and handling requirements.

Q: Why is PR2512FKE7W0R03Z rated at 2W instead of 3W like the Riedon alternatives?

A: PR2512FKE7W0R03Z is manufactured by YAGEO and meets all electrical requirements of the original CSR25120R03F (1W rating). The 2W rating still exceeds the original specification, providing adequate thermal performance for the same applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. CSR25120R03F, CSRL3-0R03F1, CSRL3-0R03F8, and PR2512FKE7W0R03Z are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Can I use these substitutes in high-temperature applications?

A: All parts operate across -55°C to 170°C. Temperature coefficient specifications (±50ppm/°C for CSR25120R03F, CSRL3-0R03F1, and PR2512FKE7W0R03Z) define resistance stability across this range. CSRL3-0R03F8 does not specify temperature coefficient; verify with manufacturer if precision temperature tracking is critical.

Q: What is the physical size difference between these parts?

A: CSR25120R03F measures 0.250" L × 0.125" W (6.35mm × 3.18mm) with 0.035" max seated height. CSRL3-0R03F1 and CSRL3-0R03F8 measure 0.252" L × 0.126" W (6.40mm × 3.20mm) with 0.035" max seated height. PR2512FKE7W0R03Z measures 0.252" L × 0.126" W (6.40mm × 3.20mm) with 0.041" max seated height. All fit standard 2512 footprints; verify PCB layout clearance for PR2512FKE7W0R03Z due to increased height.