43F7K5 Equivalent & Substitute Parts

Part Overview

The 43F7K5 is a 7.5 kOhms ±1% 3W through-hole resistor manufactured by Ohmite in the Ohmicone® 40 series. This axial wirewound resistor is designed for applications requiring precision resistance with moderate power dissipation capabilities. The part is currently active in production with 1040 units in stock. Substitute parts are necessary to address packaging preferences, compliance requirements, or inventory availability across different manufacturing series and suppliers.

Substiute Parts

43F7K5

OhmiteIn Stock: 112643F7K5 Datasheet

Current PartRFQ

83F7K5

OhmiteIn Stock: 96583F7K5 Datasheet

DirectRFQ

43F7K5E

OhmiteIn Stock: 102643F7K5E Datasheet

DirectRFQ

ALSR037K500FE12

Vishay DaleIn Stock: 1179ALSR037K500FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 43F7K5 is determined by matching the following critical parameters: resistance value (7.5 kOhms), tolerance (±1%), power rating (3W), composition (wirewound), and package type (axial). All identified substitutes meet these core electrical and mechanical requirements. Variations in physical dimensions, temperature coefficient, operating temperature range, packaging format (box vs. bulk), series designation, and compliance certifications do not preclude functional substitution when the primary electrical specifications align.

The three substitute parts identified—83F7K5, 43F7K5E, and ALSR037K500FE12—each satisfy the mandatory substitution criteria while offering different advantages in terms of series availability, compliance status, and physical characteristics.

Parameter Comparison

Engineering Selection Recommendations

43F7K5E is the primary substitute when RoHS3 compliance is required. This part maintains identical electrical specifications and physical dimensions to the main part while offering improved environmental compliance status. It is packaged in bulk format rather than box format.

83F7K5 serves as an alternative within the Ohmite product line when bulk packaging is preferred and RoHS compliance is not a constraint. Physical dimensions are marginally smaller (0.217" diameter versus 0.220"), which may be advantageous in space-constrained applications. This part remains RoHS non-compliant, matching the main part's compliance status.

ALSR037K500FE12 from Vishay Dale provides a cross-manufacturer substitute with RoHS3 compliance and moisture-resistant construction. This part features a lower operating temperature minimum (-65°C versus -55°C) and slightly higher temperature coefficient (±30ppm/°C versus ±20ppm/°C). Physical dimensions are notably smaller (0.180" diameter x 0.500" length), which may require mechanical verification in existing designs.

Selection should prioritize compliance requirements first, followed by packaging format and physical dimension compatibility with the target application.

Frequently Asked Questions (FAQ)

Q: Can 43F7K5E be used as a direct replacement for 43F7K5?

A: Yes. Both parts share identical electrical specifications (7.5 kOhms ±1%, 3W, ±20ppm/°C) and physical dimensions (0.220" Dia x 0.594" L). The primary difference is packaging format (box versus bulk) and RoHS3 compliance status of 43F7K5E.

Q: What is the key difference between 83F7K5 and 43F7K5?

A: Both are Ohmite wirewound resistors with identical electrical ratings. The 83F7K5 belongs to the Acrasil® 80 series and has a marginally smaller diameter (0.217" versus 0.220"). Both remain RoHS non-compliant.

Q: Is ALSR037K500FE12 suitable for applications requiring the full -55°C to 275°C temperature range?

A: No. ALSR037K500FE12 operates from -65°C to 250°C, which does not cover the upper temperature limit of 275°C specified for the main part. Verify application requirements before substitution.

Q: Does the smaller physical size of ALSR037K500FE12 affect electrical performance?

A: No. Physical size does not affect the electrical specifications. However, mechanical fit in existing PCB layouts or component holders must be verified, as the part is notably smaller (0.180" diameter x 0.500" length versus 0.220" diameter x 0.594" length).

Q: Which substitute offers the best compliance profile?

A: Both 43F7K5E and ALSR037K500FE12 are ROHS3 compliant. 43F7K5E maintains identical dimensions and series characteristics to the main part, while ALSR037K500FE12 adds moisture-resistant construction at the cost of different physical dimensions and slightly higher temperature coefficient.