43F20R Equivalent & Substitute Parts

Part Overview

The Ohmite 43F20R is a 20 Ohm ±1% 3W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is actively manufactured and maintained in stock inventory. Equivalent and substitute parts are identified based on matching electrical specifications (resistance value, tolerance, power rating) and mechanical compatibility (axial package configuration) to ensure direct functional replacement in circuit applications.

Substiute Parts

43F20R

OhmiteIn Stock: 117443F20R Datasheet

Current PartRFQ

ALSR0320R00FE12

Vishay DaleIn Stock: 974ALSR0320R00FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43F20R are qualified based on the following critical parameters:

• Resistance Value: Exact match at 20 Ohms
• Tolerance: ±1% precision grade
• Power Rating: 3W minimum capacity
• Package Configuration: Axial through-hole form factor
• Composition: Wirewound construction

The Vishay Dale ALSR0320R00FE12 meets all core electrical and mechanical substitution criteria. Both parts deliver identical resistance, tolerance, and power specifications in compatible axial packages suitable for through-hole PCB assembly.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: The 43F20R remains the specified component for applications requiring the exact Ohmicone® 40 series characteristics and RoHS non-compliant status.

Substitute Selection: The Vishay Dale ALSR0320R00FE12 is electrically and mechanically equivalent for 20 Ohm ±1% 3W axial resistor applications. This substitute offers ROHS3 compliance, making it suitable for applications with RoHS regulatory requirements. The slightly smaller physical dimensions (0.180" Dia x 0.500" L versus 0.220" Dia x 0.594" L) provide layout flexibility in space-constrained designs while maintaining identical electrical performance.

The temperature coefficient difference (±30ppm/°C versus ±20ppm/°C) is within acceptable tolerance for general-purpose applications but should be evaluated for precision circuits requiring superior temperature stability.

Frequently Asked Questions (FAQ)

Q: Can the ALSR0320R00FE12 directly replace the 43F20R in existing designs?

A: Yes. Both components share identical electrical specifications (20 Ohms, ±1%, 3W) and axial package configuration. The ALSR0320R00FE12 has smaller physical dimensions, which may require PCB layout verification in space-constrained applications but does not affect electrical compatibility.

Q: What is the primary difference between these two parts?

A: The main differences are RoHS compliance status (ALSR0320R00FE12 is ROHS3 compliant; 43F20R is non-compliant) and temperature coefficient (±30ppm/°C versus ±20ppm/°C). Electrical performance and power rating are identical.

Q: Are there any package compatibility concerns?

A: Both parts use axial through-hole packages with 2 terminations. The ALSR0320R00FE12 is physically smaller. Verify PCB hole spacing and lead length requirements for your specific application before substitution.

Q: Which part should I select for new designs?

A: For new designs with RoHS compliance requirements, select the ALSR0320R00FE12. For applications requiring the specific Ohmicone® 40 series characteristics or non-compliant status, use the 43F20R.