Ohmite 43F12R Equivalent & Substitute Parts

Part Overview

The Ohmite 43F12R is a 12 Ohm ±1% 3W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is currently active in production. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity when the primary part becomes unavailable or when alternative packaging or compliance requirements necessitate component substitution.

Substiute Parts

43F12R

OhmiteIn Stock: 81543F12R Datasheet

Current PartRFQ

43F12RE

OhmiteIn Stock: 86543F12RE Datasheet

DirectRFQ

ALSR0312R00FE12

Vishay DaleIn Stock: 919ALSR0312R00FE12 Datasheet

DirectRFQ

RS02B12R00FS70

Vishay DaleIn Stock: 1865RS02B12R00FS70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43F12R are qualified based on the following core electrical and mechanical parameters:

• Resistance value: 12 Ohms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Number of terminations: 2

All identified substitutes maintain these core specifications. Variations in temperature coefficient, operating temperature range, physical dimensions, moisture resistance features, and RoHS compliance status are documented to support design and procurement decisions.

Parameter Comparison

Engineering Selection Recommendations

All four parts maintain identical core electrical specifications: 12 Ohms ±1% at 3W with wirewound axial construction. Selection among these substitutes is determined by compliance requirements and application constraints.

For RoHS3-compliant applications, the 43F12RE (Ohmite) and ALSR0312R00FE12 (Vishay Dale) are suitable. The 43F12RE maintains identical dimensions to the primary part 43F12R, ensuring direct mechanical compatibility in existing designs. The ALSR0312R00FE12 offers a smaller physical footprint and extended operating temperature range (-65°C ~ 250°C) with moisture-resistant construction.

For applications without RoHS compliance requirements, the 43F12R and RS02B12R00FS70 remain valid. The RS02B12R00FS70 provides moisture-resistant construction and an extended operating temperature range while maintaining a temperature coefficient of ±20ppm/°C.

Physical dimensions vary across substitutes. PCB layout verification is necessary when substituting parts with different body diameters or lengths, particularly in space-constrained designs.

Frequently Asked Questions (FAQ)

Q: Can the 43F12RE be used as a direct replacement for the 43F12R?

A: Yes. Both parts are from the Ohmite Ohmicone® 40 series with identical electrical specifications (12 Ohms ±1%, 3W) and physical dimensions (0.220" Dia x 0.594" L). The primary difference is RoHS compliance status: 43F12RE is ROHS3 compliant while 43F12R is not.

Q: What are the dimensional differences between substitutes?

A: The 43F12R and 43F12RE share identical dimensions (0.220" Dia x 0.594" L). The ALSR0312R00FE12 is smaller at 0.180" Dia x 0.500" L, and the RS02B12R00FS70 measures 0.187" Dia x 0.560" L. Verify PCB layout compatibility before substitution.

Q: Which substitute offers the widest operating temperature range?

A: Both the ALSR0312R00FE12 and RS02B12R00FS70 support -65°C ~ 250°C operating temperature. The 43F12R and 43F12RE do not specify an operating temperature range.

Q: Are all substitutes moisture resistant?

A: No. The ALSR0312R00FE12 and RS02B12R00FS70 feature moisture-resistant construction. The 43F12R and 43F12RE do not specify moisture resistance.

Q: What is the temperature coefficient difference between parts?

A: The 43F12R, 43F12RE, and RS02B12R00FS70 all have ±20ppm/°C. The ALSR0312R00FE12 has ±30ppm/°C, which is a wider tolerance.

Q: Which substitute is best for RoHS-compliant designs?

A: The 43F12RE and ALSR0312R00FE12 are both ROHS3 compliant. Choose 43F12RE for direct dimensional compatibility or ALSR0312R00FE12 for extended temperature range and moisture resistance.