Ohmite 43FR25 Equivalent & Substitute Parts

Part Overview

The Ohmite 43FR25 is a 250 mOhms ±1% 3W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production. Substitute parts are identified based on matching electrical specifications (resistance value, tolerance, power rating) and mechanical compatibility (axial package, through-hole termination).

Substiute Parts

43FR25

OhmiteIn Stock: 105543FR25 Datasheet

Current PartRFQ

43FR25E

OhmiteIn Stock: 90543FR25E Datasheet

DirectRFQ

43FR25E

OhmiteIn Stock: 90543FR25E Datasheet

DirectRFQ

ALSR03R2500FE12

Vishay DaleIn Stock: 736ALSR03R2500FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43FR25 are qualified based on the following criteria:

• Resistance value: 250 mOhms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Number of terminations: 2

The identified substitutes maintain these core electrical and mechanical parameters, ensuring functional equivalence in circuit applications. Variations in physical dimensions, temperature coefficient specifications, and compliance certifications are noted but do not affect substitutability for the specified electrical function.

Parameter Comparison

Engineering Selection Recommendations

All three parts meet the core electrical and mechanical requirements for substitution. Selection should be based on the following factors:

43FR25E (Ohmite): Direct manufacturer equivalent with identical dimensions and temperature coefficient. Offers RoHS compliance upgrade over the original 43FR25. Recommended for applications requiring RoHS compliance without dimensional constraints.

ALSR03R2500FE12 (Vishay Dale): Meets all electrical specifications with additional moisture-resistant construction and extended operating temperature range (-65°C ~ 250°C). Smaller physical dimensions (0.180" Dia x 0.500" L) may be advantageous in space-constrained layouts. ROHS3 compliant. Suitable for applications requiring enhanced environmental protection or wider temperature operation.

Frequently Asked Questions (FAQ)

Q: Can the 43FR25E be used as a direct replacement for the 43FR25?

A: Yes. The 43FR25E maintains identical electrical specifications (250 mOhms ±1%, 3W) and physical dimensions (0.220" Dia x 0.594" L). The primary difference is RoHS compliance status.

Q: What are the dimensional differences between the Ohmite and Vishay Dale substitutes?

A: The ALSR03R2500FE12 has smaller dimensions (0.180" Dia x 0.500" L) compared to both Ohmite parts (0.220" Dia x 0.594" L). This may affect board layout and mounting considerations.

Q: Does the ALSR03R2500FE12 have a specified temperature coefficient?

A: The temperature coefficient for the ALSR03R2500FE12 is not provided in the available specifications. The Ohmite parts specify ±90ppm/°C.

Q: Are all substitutes suitable for high-temperature applications?

A: The ALSR03R2500FE12 specifies an operating temperature range of -65°C ~ 250°C. Operating temperature ranges for the Ohmite parts are not specified in the available data.

Q: What is the difference in RoHS compliance between these parts?

A: The original 43FR25 is RoHS non-compliant. The 43FR25E is RoHS Compliant. The ALSR03R2500FE12 is ROHS3 Compliant. Selection depends on regulatory requirements for the end application.

Q: Does the moisture-resistant feature of the ALSR03R2500FE12 affect electrical performance?

A: Moisture resistance is a construction feature that does not alter the specified electrical parameters (resistance, tolerance, power rating). It provides enhanced reliability in humid or wet environments.