Ohmite 43F100 100 Ohm 3W Axial Wirewound Resistor Equivalent & Substitute Parts

Part Overview

The Ohmite 43F100 is a 100 Ohm ±1% 3W through-hole axial wirewound resistor from the Ohmicone® 40 series. This component is currently active in production with 790 pieces in stock. Equivalent and substitute parts are identified based on matching electrical specifications (resistance value, tolerance, power rating, and composition) and mechanical compatibility (axial package configuration). Alternative sources become necessary for supply chain continuity, packaging preferences, compliance requirements, or regional availability.

Substiute Parts

43F100

OhmiteIn Stock: 84143F100 Datasheet

Current PartRFQ

43F100E

OhmiteIn Stock: 124043F100E Datasheet

DirectRFQ

ALSR03100R0FE12

Vishay DaleIn Stock: 1298ALSR03100R0FE12 Datasheet

DirectRFQ

RS02B100R0FS70

Vishay DaleIn Stock: 1653RS02B100R0FS70 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 43F100 is determined by the following mandatory parameters:

• Resistance value: 100 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)
• Terminations: 2-pin configuration (exact match required)

All identified substitute parts meet these core electrical and mechanical criteria. Variations in temperature coefficient, operating temperature range, physical dimensions, moisture resistance features, and compliance certifications are secondary differentiators that do not affect functional substitutability for the specified 100 Ohm 3W axial wirewound application.

Parameter Comparison

Engineering Selection Recommendations

All four parts are functionally equivalent for 100 Ohm 3W axial wirewound resistor applications. Selection among these alternatives is based on the following criteria:

Ohmite 43F100E: Direct manufacturer equivalent with identical electrical and physical specifications. Offers ROHS3 compliance upgrade over the original 43F100. Recommended when RoHS compliance is required and Ohmite sourcing is preferred.

Vishay Dale ALSR03100R0FE12: Meets all core electrical requirements with moisture-resistant construction and extended operating temperature range (-65°C ~ 250°C). Slightly smaller physical dimensions (0.180" diameter). ROHS3 compliant. Suitable for applications requiring enhanced environmental protection and wider temperature operation.

Vishay Dale RS02B100R0FS70: Meets all core electrical requirements with moisture-resistant construction and extended operating temperature range (-65°C ~ 250°C). Supplied in Cut Tape packaging. Maintains ±20ppm/°C temperature coefficient matching the original part. RoHS non-compliant status aligns with the original 43F100. Recommended when Cut Tape packaging format is required for automated assembly.

Frequently Asked Questions (FAQ)

Q: Can I substitute the Ohmite 43F100 with the Ohmite 43F100E?

A: Yes. The 43F100E is a direct equivalent with identical electrical specifications (100 Ohms ±1%, 3W, wirewound, axial) and physical dimensions. The primary difference is ROHS3 compliance certification on the 43F100E versus non-compliance on the original 43F100.

Q: What are the physical dimension differences between these parts?

A: The Ohmite parts (43F100 and 43F100E) are 0.220" diameter × 0.594" length. The Vishay Dale ALSR03100R0FE12 is 0.180" diameter × 0.500" length (smaller). The Vishay Dale RS02B100R0FS70 is 0.187" diameter × 0.560" length (intermediate). All fit standard axial through-hole PCB layouts, though board spacing may require verification for the smaller ALSR variant.

Q: Do the Vishay Dale parts have different temperature coefficients?

A: The ALSR03100R0FE12 has ±30ppm/°C, while the RS02B100R0FS70 has ±20ppm/°C. The original Ohmite 43F100 and 43F100E both specify ±20ppm/°C. For applications with tight temperature stability requirements, the ±20ppm/°C parts are preferred.

Q: What is the difference between Bulk and Cut Tape packaging?

A: Bulk packaging is suitable for manual assembly and small-volume applications. Cut Tape (CT) packaging is designed for automated pick-and-place assembly equipment. The RS02B100R0FS70 is supplied in Cut Tape format, while the other three parts are in Bulk packaging.

Q: Are the Vishay Dale parts moisture resistant?

A: Yes. Both Vishay Dale parts (ALSR03100R0FE12 and RS02B100R0FS70) feature moisture-resistant construction. The Ohmite parts do not specify this feature. Moisture resistance is beneficial in humid or corrosive environments.

Q: Which part should I choose for RoHS-compliant applications?

A: The Ohmite 43F100E and Vishay Dale ALSR03100R0FE12 are both ROHS3 compliant. The original Ohmite 43F100 and Vishay Dale RS02B100R0FS70 are RoHS non-compliant.