Equivalent & Substitute Parts for 43FR33

Part Overview

The 43FR33 is a 330 mOhms ±1% 3W axial wirewound resistor manufactured by Ohmite in the Ohmicone® 40 series. This component is an active product designed for through-hole applications requiring precision low-resistance dissipation. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within the specified parameter tolerances.

Substiute Parts

43FR33

OhmiteIn Stock: 91943FR33 Datasheet

Current PartRFQ

43FR33E

OhmiteIn Stock: 81643FR33E Datasheet

DirectRFQ

ALSR03R3300FE12

Vishay DaleIn Stock: 1231ALSR03R3300FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43FR33 are qualified based on the following critical parameters:

• Resistance value: 330 mOhms
• Tolerance: ±1%
• Power rating: 3W
• Composition: Wirewound
• Package: Axial through-hole
• Terminations: 2-pin configuration

The identified substitutes maintain these core electrical and mechanical specifications. Variations in physical dimensions, operating temperature ranges, and compliance certifications are noted but do not preclude functional equivalence within the defined parameter set.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and meet the core electrical specifications of 330 mOhms ±1% at 3W with axial wirewound construction.

The 43FR33E (Ohmite) is dimensionally identical to the main part and offers RoHS compliance with an extended upper operating temperature of 275°C. This part is suitable for applications requiring regulatory compliance without physical board redesign.

The ALSR03R3300FE12 (Vishay Dale) provides ROHS3 compliance and moisture-resistant construction. Physical dimensions are reduced (0.180" Dia x 0.500" L versus 0.220" Dia x 0.594" L), which may require board layout verification for space-constrained applications. The lower operating temperature maximum of 250°C should be confirmed against application requirements.

Frequently Asked Questions (FAQ)

Q: Can 43FR33E be used as a direct replacement for 43FR33?

A: Yes. Both parts share identical resistance (330 mOhms), tolerance (±1%), power rating (3W), composition (wirewound), package (axial), and physical dimensions (0.220" Dia x 0.594" L). The primary difference is RoHS compliance status.

Q: What are the physical dimension differences between substitutes?

A: The 43FR33 and 43FR33E are identical at 0.220" Dia x 0.594" L (5.60mm x 15.10mm). The ALSR03R3300FE12 is smaller at 0.180" Dia x 0.500" L (4.57mm x 12.70mm). Board layout verification is required if using the Vishay Dale part in space-constrained designs.

Q: Are all substitutes rated for the same operating temperature?

A: No. The 43FR33 does not specify an operating temperature range. The 43FR33E operates from -55°C to 275°C. The ALSR03R3300FE12 operates from -65°C to 250°C. Application temperature requirements must be confirmed against the selected part.

Q: What is the significance of RoHS compliance differences?

A: The 43FR33 is RoHS non-compliant. Both 43FR33E and ALSR03R3300FE12 are RoHS compliant. Regulatory requirements for the end application determine whether compliance is mandatory.

Q: Can ALSR03R3300FE12 be used in all applications where 43FR33 is specified?

A: Electrical equivalence is confirmed. Physical dimensions are smaller, requiring board layout verification. Operating temperature range (-65°C to 250°C) must be validated against application requirements. Moisture-resistant construction is an additional feature not present in the original part.