F20J1R0 Wirewound Chassis Mount Resistor – Equivalent & Substitute Parts

Part Overview

The F20J1R0 is a 1 Ohm ±5% 20W wirewound chassis mount resistor manufactured by Ohmite, part of the Stackohm® 250 series. This component is designed for high-power applications requiring stable resistance performance across extended temperature ranges. The part is currently active in production with 747 units in stock. Equivalent and substitute parts may be required due to application-specific power requirements, compliance needs, or inventory constraints.

Substiute Parts

F20J1R0

OhmiteIn Stock: 757F20J1R0 Datasheet

Current PartRFQ

F10J1R0E

OhmiteIn Stock: 761F10J1R0E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the F20J1R0 is determined by the following critical parameters:

• Resistance Value: Must be 1 Ohm
• Tolerance: Must be ±5%
• Composition: Must be Wirewound
• Temperature Coefficient: Must be ±400ppm/°C
• Operating Temperature Range: Must be -55°C ~ 350°C
• Mounting Feature: Must be Flange Braces, Right Angle
• Lead Style: Must be Solder Lugs
• Package/Case: Must be Radial, Flat Oval
• Coating/Housing Type: Must be Vitreous Enamel Coated

The F10J1R0E qualifies as a parametric equivalent based on these core electrical and mechanical specifications. The primary difference is the power rating (10W versus 20W), which represents a derating scenario where the substitute part operates at reduced power capacity while maintaining all other critical parameters.

Parameter Comparison

Engineering Selection Recommendations

F20J1R0 (Primary Selection)

• Use when 20W power dissipation capacity is required
• Suitable for applications with higher thermal load requirements
• RoHS non-compliant status must be evaluated against project compliance requirements

F10J1R0E (Substitute Selection)

• Use only when circuit power dissipation does not exceed 10W
• Provides ROHS3 compliance advantage for regulated applications
• Identical electrical and mechanical characteristics to F20J1R0 except power rating
• Both parts are active products with adequate inventory availability

Selection between these parts is determined by the actual power dissipation requirement of the circuit. The F10J1R0E is suitable only for applications where the resistor operates at 10W or below.

Frequently Asked Questions (FAQ)

Q: Can F10J1R0E replace F20J1R0 in all applications? A: No. The F10J1R0E has a maximum power rating of 10W, while the F20J1R0 is rated for 20W. Substitution is valid only when circuit power dissipation does not exceed 10W. Operating the F10J1R0E above its power rating will result in component failure.

Q: Are the physical dimensions identical between these parts? A: Yes. Both parts have identical dimensions of 0.750" L x 0.375" W (19.05mm x 9.53mm) and use the same Radial, Flat Oval package with Flange Braces, Right Angle mounting features. They are mechanically interchangeable.

Q: What is the difference in RoHS compliance between these parts? A: The F20J1R0 is RoHS non-compliant, while the F10J1R0E is ROHS3 compliant. For applications requiring RoHS compliance, the F10J1R0E is the appropriate selection, provided power requirements do not exceed 10W.

Q: Do these parts have the same electrical characteristics? A: Yes. Both parts have identical resistance (1 Ohm), tolerance (±5%), temperature coefficient (±400ppm/°C), and operating temperature range (-55°C ~ 350°C). The only electrical difference is the power rating.

Q: Are both parts currently available? A: Yes. The F20J1R0 has 747 units in stock, and the F10J1R0E has 652 units in stock. Both are active products.