Ohmite 43F700 Equivalent & Substitute Parts

Part Overview

The Ohmite 43F700 is a 700 Ohms ±1% 3W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production and maintains 1058 units in new original stock. The need for equivalent and substitute parts arises from supply chain considerations, regional availability, and specific application requirements where alternative specifications may be acceptable within defined electrical and mechanical tolerances.

Substiute Parts

43F700

OhmiteIn Stock: 112143F700 Datasheet

Current PartRFQ

ALSR03700R0FE12

Vishay DaleIn Stock: 883ALSR03700R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 43F700 is determined by strict equivalence across the following critical parameters:

• Resistance Value: 700 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power Rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package Type: Axial (exact match required)
• Number of Terminations: 2 (exact match required)

The Vishay Dale ALSR03700R0FE12 meets all mandatory substitution criteria. While this substitute exhibits a higher temperature coefficient (±30ppm/°C versus ±20ppm/°C) and an extended operating temperature range (-65°C ~ 250°C), these variations remain within acceptable parameters for general-purpose applications. The substitute includes moisture-resistant construction and achieves ROHS3 compliance, representing an improvement in environmental durability compared to the original part.

Parameter Comparison

Engineering Selection Recommendations

Both the Ohmite 43F700 and Vishay Dale ALSR03700R0FE12 are active production components with confirmed inventory availability. Selection between these parts should be based on compliance requirements and environmental durability needs.

The Ohmite 43F700 maintains the original specification with RoHS non-compliant status and standard wirewound construction. This part is suitable for applications where legacy component specifications are required or where RoHS compliance is not mandated.

The Vishay Dale ALSR03700R0FE12 provides ROHS3 compliance and moisture-resistant construction, making it the preferred choice for applications subject to environmental regulations or operating in humid conditions. The slightly higher temperature coefficient (±30ppm/°C) and compact physical dimensions represent acceptable trade-offs for improved environmental performance. Both components share identical electrical core specifications: 700 Ohms, ±1% tolerance, and 3W power rating.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale ALSR03700R0FE12 be used as a direct replacement for the Ohmite 43F700?

A: Yes, the Vishay Dale ALSR03700R0FE12 qualifies as a direct electrical substitute. Both components share identical resistance (700 Ohms), tolerance (±1%), power rating (3W), composition (wirewound), and package type (axial). Physical dimensions differ slightly, but both maintain standard axial lead spacing compatible with through-hole PCB layouts.

Q: What is the significance of the temperature coefficient difference?

A: The Ohmite 43F700 specifies ±20ppm/°C while the Vishay Dale substitute specifies ±30ppm/°C. This difference indicates the rate of resistance change across temperature variations. For most general-purpose applications, both values fall within acceptable drift ranges. Applications requiring precision performance across extreme temperature ranges should evaluate this parameter against specific circuit requirements.

Q: Does the moisture-resistant feature of the Vishay Dale part affect compatibility?

A: No. Moisture-resistant construction is an enhancement that does not compromise electrical or mechanical compatibility. This feature provides additional durability in humid or corrosive environments without altering the component's electrical performance or physical interface.

Q: Are there physical installation considerations due to size differences?

A: The Vishay Dale ALSR03700R0FE12 is physically smaller (0.180" Dia x 0.500" L) compared to the Ohmite 43F700 (0.220" Dia x 0.594" L). Both maintain standard axial lead configuration. The smaller footprint of the substitute may provide layout advantages in space-constrained designs without requiring PCB modifications.

Q: What is the impact of RoHS compliance differences?

A: The Ohmite 43F700 is RoHS non-compliant while the Vishay Dale ALSR03700R0FE12 is ROHS3 compliant. For applications or markets requiring RoHS compliance, the Vishay Dale part is the appropriate selection. For legacy systems or applications without compliance requirements, either part is acceptable.