Equivalent & Substitute Parts for Ohmite 43F800

Part Overview

The Ohmite 43F800 is an 800 Ohm ±1% 3W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is currently active in production with 1097 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when specific compliance requirements must be met.

Substiute Parts

43F800

OhmiteIn Stock: 112443F800 Datasheet

Current PartRFQ

43F800E

OhmiteIn Stock: 108743F800E Datasheet

DirectRFQ

ALSR03800R0FE12

Vishay DaleIn Stock: 981ALSR03800R0FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43F800 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 800 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial through-hole (exact match required)
• Number of terminations: 2 (exact match required)

The following parts meet these core substitution criteria:

43F800E (Ohmite): Direct equivalent with identical electrical specifications. Differs only in packaging format (Bulk) and RoHS compliance status (ROHS3 Compliant vs. non-compliant).

ALSR03800R0FE12 (Vishay Dale): Meets all core electrical parameters. Provides additional moisture resistance feature and extended operating temperature range (-65°C ~ 250°C). Temperature coefficient is ±30ppm/°C (slightly higher tolerance than primary part). Physical dimensions are slightly smaller (0.180" Dia x 0.500" L vs. 0.220" Dia x 0.594" L).

Parameter Comparison

Engineering Selection Recommendations

43F800E (Ohmite): Select this part when RoHS3 compliance is required and packaging format flexibility is acceptable. Electrical performance is identical to the primary part. This is the preferred direct substitute for new designs or when regulatory compliance mandates RoHS certification.

ALSR03800R0FE12 (Vishay Dale): Select this part when moisture resistance and extended operating temperature range are design requirements. The slightly higher temperature coefficient (±30ppm/°C vs. ±20ppm/°C) must be evaluated against circuit tolerance requirements. The smaller physical dimensions may provide PCB layout advantages in space-constrained applications. RoHS3 compliance is confirmed.

Frequently Asked Questions (FAQ)

Q: Can 43F800E be used as a direct replacement for 43F800?

A: Yes. The 43F800E is electrically and mechanically identical to the 43F800. The primary difference is RoHS3 compliance status and packaging format (Bulk). No circuit redesign is required.

Q: What are the key differences between ALSR03800R0FE12 and the primary part?

A: The ALSR03800R0FE12 offers moisture resistance and an extended operating temperature range (-65°C ~ 250°C). The temperature coefficient is ±30ppm/°C compared to ±20ppm/°C for the primary part. Physical dimensions are smaller (0.180" Dia x 0.500" L vs. 0.220" Dia x 0.594" L). Both are RoHS3 compliant.

Q: Will the smaller size of ALSR03800R0FE12 affect PCB layout compatibility?

A: The ALSR03800R0FE12 has a smaller diameter and length. PCB footprints designed for the larger 43F800 dimensions will accommodate the smaller part without issue. However, verify that lead spacing and hole positioning remain compatible with your specific PCB design.

Q: Are all substitute parts RoHS compliant?

A: The 43F800 is RoHS non-compliant. Both substitute parts (43F800E and ALSR03800R0FE12) are ROHS3 compliant, making them suitable for applications with RoHS regulatory requirements.

Q: Which substitute should I select for high-temperature applications?

A: The ALSR03800R0FE12 supports operating temperatures from -65°C to 250°C. The primary part and 43F800E do not specify operating temperature limits. For applications requiring extended temperature performance, the ALSR03800R0FE12 is the appropriate selection.