43F22R Equivalent & Substitute Parts

Part Overview

The 43F22R is a 22 Ohm ±1% 3W axial wirewound through-hole resistor manufactured by Ohmite, part of the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with moderate power dissipation in a compact axial package. The part is currently active in production with 849 units in stock. Equivalent and substitute parts are identified when identical electrical specifications and mechanical compatibility are maintained across different manufacturers or packaging configurations.

Substiute Parts

43F22R

OhmiteIn Stock: 93643F22R Datasheet

Current PartRFQ

43F22RE

OhmiteIn Stock: 69943F22RE Datasheet

DirectRFQ

ALSR0322R00FE12

Vishay DaleIn Stock: 979ALSR0322R00FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 43F22R is determined by the following critical parameters:

• Resistance value: 22 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 3W (exact match required)
• Composition: Wirewound (exact match required)
• Package type: Axial through-hole (exact match required)
• Number of terminations: 2 (exact match required)

The 43F22RE is a direct equivalent from Ohmite, differing only in packaging format (Bulk vs. standard packaging) and RoHS compliance status. The ALSR0322R00FE12 from Vishay Dale meets all core electrical specifications but features a smaller physical envelope and includes moisture-resistant construction. Both substitute parts maintain the required 22 Ohm resistance, ±1% tolerance, and 3W power rating in axial wirewound configuration.

Parameter Comparison

Engineering Selection Recommendations

The 43F22RE serves as the primary direct substitute for the 43F22R, offering identical electrical and mechanical specifications with improved RoHS compliance. Both parts are manufactured by Ohmite and maintain the same physical footprint and performance characteristics.

The ALSR0322R00FE12 from Vishay Dale is electrically equivalent but features a reduced physical envelope (0.180" diameter vs. 0.220" diameter) and includes moisture-resistant construction. This part is suitable for applications where space constraints exist or enhanced environmental protection is required. The slightly higher temperature coefficient (±30ppm/°C vs. ±20ppm/°C) and narrower upper operating temperature limit (250°C vs. 275°C) should be evaluated against specific application requirements.

Selection between these substitutes depends on compliance requirements (RoHS status), physical space availability, environmental exposure conditions, and temperature stability specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can the 43F22RE be used as a direct replacement for the 43F22R?

A: Yes. The 43F22RE is electrically and mechanically identical to the 43F22R, with the primary difference being RoHS compliance status and packaging format. Both parts share the same 22 Ohm resistance, ±1% tolerance, 3W power rating, and 0.220" x 0.594" axial dimensions.

Q: Is the ALSR0322R00FE12 compatible with the 43F22R in all applications?

A: The ALSR0322R00FE12 is electrically compatible, maintaining the same 22 Ohm resistance, ±1% tolerance, and 3W power rating. However, its smaller physical dimensions (0.180" x 0.500") may affect board layout compatibility. The higher temperature coefficient (±30ppm/°C vs. ±20ppm/°C) and lower maximum operating temperature (250°C vs. 275°C) require verification against application specifications.

Q: What is the significance of the moisture-resistant feature on the ALSR0322R00FE12?

A: Moisture-resistant construction provides enhanced protection in humid or corrosive environments. This feature is beneficial for applications exposed to condensation, salt spray, or high-humidity conditions where standard wirewound resistors may experience performance degradation.

Q: Are there packaging differences between these parts?

A: The 43F22R and 43F22RE are supplied in different packaging formats (standard vs. Bulk), but both maintain identical component specifications. The ALSR0322R00FE12 is supplied in Bulk packaging. Packaging format does not affect electrical or mechanical performance.

Q: How do the RoHS compliance statuses differ?

A: The 43F22R is RoHS non-compliant, while both the 43F22RE and ALSR0322R00FE12 are RoHS compliant. For applications subject to RoHS regulations, the 43F22RE or ALSR0322R00FE12 are required.