43FR30 Equivalent & Substitute Parts

Part Overview

The 43FR30 is a 300 mOhms ±1% 3W axial wirewound resistor manufactured by Ohmite, part of the Ohmicone® 40 series. This component is designed for through-hole applications requiring precision low-resistance values with moderate power dissipation. The part is currently active in production with 719 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

43FR30

OhmiteIn Stock: 78643FR30 Datasheet

Current PartRFQ

43FR30E

OhmiteIn Stock: 68743FR30E Datasheet

DirectRFQ

ALSR03R3000FE12

Vishay DaleIn Stock: 1234ALSR03R3000FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43FR30 are qualified based on electrical and mechanical parameter equivalence. The following criteria determine substitutability:

• Resistance value: 300 mOhms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Termination count: 2
• Temperature coefficient stability: ±90ppm/°C or equivalent performance range

Two substitute parts meet these criteria: 43FR30E (Ohmite) and ALSR03R3000FE12 (Vishay Dale). Both maintain the core electrical specifications and axial package format required for direct substitution in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—43FR30, 43FR30E, and ALSR03R3000FE12—are active products with equivalent electrical specifications (300 mOhms, ±1%, 3W, wirewound, axial package). Selection between them depends on compliance and certification requirements:

• 43FR30 (Ohmite): RoHS non-compliant. Use where legacy or non-regulated applications permit.
• 43FR30E (Ohmite): RoHS Compliant. Identical electrical and physical specifications to 43FR30 with improved compliance status. Operating temperature range -55°C ~ 275°C.
• ALSR03R3000FE12 (Vishay Dale): ROHS3 Compliant with moisture-resistant construction. Smaller physical dimensions (0.180" Dia x 0.500" L). Operating temperature range -65°C ~ 250°C. Highest inventory availability (1158 units).

Physical dimension differences exist between the Ohmite parts (0.220" Dia x 0.594" L) and the Vishay Dale part (0.180" Dia x 0.500" L). Verify PCB layout compatibility before substitution.

Frequently Asked Questions (FAQ)

Q: Can 43FR30E directly replace 43FR30 in existing designs? A: Yes. The 43FR30E maintains identical electrical specifications (300 mOhms, ±1%, 3W) and physical dimensions (0.220" Dia x 0.594" L). The primary difference is RoHS compliance status. No circuit redesign is required.

Q: What are the physical dimension differences between substitute parts? A: The 43FR30 and 43FR30E share identical dimensions: 0.220" Dia x 0.594" L (5.60mm x 15.10mm). The ALSR03R3000FE12 is smaller: 0.180" Dia x 0.500" L (4.57mm x 12.70mm). Verify PCB footprint and lead spacing compatibility before selecting the Vishay Dale part.

Q: Which substitute part has the widest operating temperature range? A: The 43FR30E operates from -55°C ~ 275°C, providing the highest upper temperature limit. The ALSR03R3000FE12 operates from -65°C ~ 250°C, offering the lowest lower temperature limit.

Q: Are all substitute parts wirewound composition? A: Yes. All three parts—43FR30, 43FR30E, and ALSR03R3000FE12—are wirewound resistors with identical resistance value, tolerance, and power rating.

Q: What is the moisture resistance feature on the ALSR03R3000FE12? A: The ALSR03R3000FE12 includes moisture-resistant construction. All three parts have MSL rating of 1 (Unlimited) or Not Applicable, indicating low moisture sensitivity for standard storage and handling.

Q: Which part has the best inventory availability? A: The ALSR03R3000FE12 (Vishay Dale) has 1158 units in stock, compared to 719 units for 43FR30 and 669 units for 43FR30E.