FPS2B-50RF1 Equivalent & Substitute Parts

Part Overview

The FPS2B-50RF1 is a 50 Ohm ±1% 1.5W chip resistor manufactured by Riedon, designed for current sense applications in TO-263-3 (D2PAK) packaging. This metal foil, non-inductive component operates across -40°C to 130°C and is ROHS3 compliant with unlimited moisture sensitivity rating. The part is currently active in production with 883 units in stock. Substitute parts are identified when equivalent electrical specifications and compatible packaging footprints are required for design flexibility, inventory management, or supply chain optimization.

Substiute Parts

FPS2B-50RF1

RiedonIn Stock: 988FPS2B-50RF1 Datasheet

Current PartRFQ

MP725-50.0-1%

Caddock Electronics Inc.In Stock: 9341MP725-50.0-1% Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FPS2B-50RF1 is determined by the following critical parameters:

• Resistance value: 50 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Package compatibility: TO-263-3 or DPAK footprint (2 Leads + Tab configuration)
• Current sense application suitability
• Non-inductive characteristics
• RoHS3 compliance
• MSL rating of 1 or better

The MP725-50.0-1% qualifies as a substitute based on matching resistance, tolerance, and compatible D2PAK/DPAK footprint. While the MP725 offers higher power rating (25W vs. 1.5W) and extended temperature range (-55°C to 150°C), these represent performance enhancements rather than deviations from the core electrical specification. Both parts maintain current sense functionality and non-inductive design suitable for the same application class.

Parameter Comparison

Engineering Selection Recommendations

Both the FPS2B-50RF1 and MP725-50.0-1% meet ROHS3 compliance and carry MSL rating 1, qualifying them for equivalent application in current sense circuits. The FPS2B-50RF1 employs metal foil construction with tighter temperature coefficient (±50ppm/°C), while the MP725-50.0-1% uses thick film technology with asymmetric temperature coefficient (-20/+80ppm/°C) and delivers significantly higher power dissipation capacity (25W).

Selection between these parts depends on circuit power requirements and thermal management constraints. The MP725-50.0-1% provides design margin for applications approaching or exceeding 1.5W dissipation and operates across a wider temperature envelope (-55°C to 150°C vs. -40°C to 130°C). Package footprint differences (D2PAK vs. DPAK) require PCB layout verification for mechanical fit and thermal performance.

Frequently Asked Questions (FAQ)

Q: Can MP725-50.0-1% directly replace FPS2B-50RF1 on existing PCBs?

A: Electrical substitution is valid based on matching 50 Ohm resistance and ±1% tolerance. However, physical footprint differs: FPS2B-50RF1 uses D2PAK (12.70mm x 10.16mm), while MP725-50.0-1% uses DPAK (8.26mm x 8.13mm). PCB layout modification is required to accommodate the smaller DPAK package.

Q: What are the key differences in composition between these parts?

A: FPS2B-50RF1 uses metal foil construction, delivering superior temperature stability (±50ppm/°C). MP725-50.0-1% employs thick film technology with asymmetric temperature coefficient (-20/+80ppm/°C). Metal foil typically offers lower noise and better frequency response for precision current sensing.

Q: Are both parts suitable for high-temperature applications?

A: FPS2B-50RF1 operates to 130°C maximum. MP725-50.0-1% extends to 150°C, providing 20°C additional margin. For applications approaching or exceeding 130°C, the MP725-50.0-1% is the appropriate selection.

Q: Do packaging differences affect thermal performance?

A: Yes. The MP725-50.0-1% DPAK package is physically smaller (8.26mm x 8.13mm vs. 12.70mm x 10.16mm) with lower seated height (3.05mm vs. 4.10mm). Thermal dissipation characteristics depend on PCB copper area, via placement, and thermal vias. Verify thermal performance through simulation or testing when substituting.

Q: Are both parts RoHS and REACH compliant?

A: Both are ROHS3 compliant with MSL rating 1 (unlimited moisture sensitivity). FPS2B-50RF1 is REACH Affected; MP725-50.0-1% is REACH Unaffected. Verify REACH compliance requirements for your specific application and end market.