Ohmite 43F400 Equivalent & Substitute Parts

Part Overview

The Ohmite 43F400 is a 400 Ohms ±1% 3W through-hole resistor with axial wirewound composition, part of the Ohmicone® 40 series. This component is currently active in production. Equivalent and substitute parts may be required due to inventory availability, packaging preferences, compliance requirements, or specific application constraints such as operating temperature range or moisture resistance specifications.

Substiute Parts

43F400

OhmiteIn Stock: 90443F400 Datasheet

Current PartRFQ

43F400E

OhmiteIn Stock: 101943F400E Datasheet

DirectRFQ

ALSR03400R0FE12

Vishay DaleIn Stock: 1266ALSR03400R0FE12 Datasheet

DirectRFQ

RS02B400R0FS70

Vishay DaleIn Stock: 2106RS02B400R0FS70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 43F400 is determined by the following core parameters: resistance value (400 Ohms), tolerance (±1%), power rating (3W), composition (wirewound), and package type (axial). All substitute parts listed maintain these electrical and mechanical specifications.

The three substitute parts are grouped as follows:

Direct Equivalent (Same Manufacturer): 43F400E by Ohmite maintains identical electrical specifications and axial package configuration, differing only in packaging format (bulk versus standard).

Cross-Manufacturer Substitutes: ALSR03400R0FE12 and RS02B400R0FS70 by Vishay Dale meet all core electrical parameters (400 Ohms, ±1%, 3W, wirewound, axial) while introducing variations in secondary specifications such as temperature coefficient, operating temperature range, moisture resistance features, and physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

For RoHS3 Compliance Requirements: The 43F400E (Ohmite) and ALSR03400R0FE12 (Vishay Dale) are ROHS3 compliant alternatives. The 43F400E maintains identical specifications and dimensions to the main part. The ALSR03400R0FE12 provides ROHS3 compliance with moisture resistance and extended operating temperature range (-65°C ~ 250°C), though with slightly different physical dimensions and a higher temperature coefficient (±30ppm/°C versus ±20ppm/°C).

For Moisture-Resistant Applications: Both ALSR03400R0FE12 and RS02B400R0FS70 include moisture-resistant features and specify operating temperature ranges of -65°C ~ 250°C, making them suitable for environments requiring enhanced environmental protection.

For Direct Replacement (Same Manufacturer): The 43F400E is the direct equivalent, maintaining all electrical and mechanical specifications of the main part while offering ROHS3 compliance and bulk packaging availability.

For Extended Temperature Range Applications: ALSR03400R0FE12 and RS02B400R0FS70 both specify operating temperature ranges of -65°C ~ 250°C, compared to the unspecified range of the main part.

Frequently Asked Questions (FAQ)

Q: Can the 43F400E be used as a direct replacement for the 43F400?

A: Yes. The 43F400E maintains identical electrical specifications (400 Ohms, ±1%, 3W), composition (wirewound), package type (axial), temperature coefficient (±20ppm/°C), and physical dimensions (0.220" Dia x 0.594" L). The primary difference is packaging format (bulk) and improved RoHS3 compliance status.

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

A: The Ohmite 43F400E is dimensionally and electrically identical to the main part. The Vishay Dale ALSR03400R0FE12 and RS02B400R0FS70 both provide moisture-resistant features and specified operating temperature ranges (-65°C ~ 250°C). Physical dimensions vary slightly: ALSR03400R0FE12 is 0.180" Dia x 0.500" L, and RS02B400R0FS70 is 0.187" Dia x 0.560" L, compared to the main part's 0.220" Dia x 0.594" L.

Q: Are there compliance differences between these parts?

A: Yes. The 43F400E and ALSR03400R0FE12 are ROHS3 compliant. The main part (43F400) and RS02B400R0FS70 are RoHS non-compliant. Applications requiring RoHS compliance should use either the 43F400E or ALSR03400R0FE12.

Q: Which substitute is recommended for high-temperature applications?

A: Both ALSR03400R0FE12 and RS02B400R0FS70 specify operating temperature ranges of -65°C ~ 250°C. The main part and 43F400E do not specify operating temperature limits. For applications requiring defined high-temperature performance, either Vishay Dale part is appropriate.

Q: Do physical dimension differences affect PCB layout compatibility?

A: Yes. The main part (43F400) and 43F400E are dimensionally identical (0.220" Dia x 0.594" L). The ALSR03400R0FE12 (0.180" Dia x 0.500" L) and RS02B400R0FS70 (0.187" Dia x 0.560" L) have different dimensions. PCB layouts designed for the main part may require modification to accommodate these substitutes, particularly regarding hole spacing and component clearance.

Q: What is the temperature coefficient difference, and does it matter?

A: The main part, 43F400E, and RS02B400R0FS70 have a temperature coefficient of ±20ppm/°C. The ALSR03400R0FE12 has ±30ppm/°C. For precision applications requiring tight resistance stability across temperature ranges, the ±20ppm/°C parts provide better performance.