Equivalent & Substitute Parts for F55J3R0

Part Overview

The F55J3R0 is a 3 Ohms ±5% 55W 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 795 units in stock.

Substitute parts become necessary when design requirements change, such as reduced power dissipation needs, updated compliance requirements, or inventory constraints. The F30J3R0E and F30J3R0 provide equivalent electrical performance at lower power ratings while maintaining core electrical specifications.

Substiute Parts

F55J3R0

OhmiteIn Stock: 865F55J3R0 Datasheet

Current PartRFQ

F30J3R0E

OhmiteIn Stock: 1133F30J3R0E Datasheet

Parametric EquivalentRFQ

F30J3R0

OhmiteIn Stock: 1002F30J3R0 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F55J3R0 is determined by the following critical parameters:

• Resistance Value: Must be 3 Ohms
• Tolerance: Must be ±5%
• Composition: Must be Wirewound
• Temperature Coefficient: Must be ±400ppm/°C
• Operating Temperature Range: Must be -55°C to 350°C
• Coating/Housing Type: Must be Vitreous Enamel Coated
• Mounting Feature: Must be Flange Braces, Right Angle
• Lead Style: Must be Solder Lugs
• Package/Case: Must be Radial, Flat Oval

The F30J3R0E and F30J3R0 meet all these criteria. The primary difference is the power rating: both substitute parts are rated at 30W compared to the 55W rating of the F55J3R0. This reduction in power dissipation capacity is the only electrical parameter that differs. Both substitute parts maintain identical resistance, tolerance, temperature characteristics, and physical mounting specifications.

Parameter Comparison

Engineering Selection Recommendations

F30J3R0E is the preferred substitute when compliance with ROHS3 standards is required. This part maintains all electrical and mechanical specifications of the F55J3R0 while providing updated environmental compliance certification. The 30W power rating is suitable for applications where the original 55W capacity is not fully utilized.

F30J3R0 provides an alternative substitute with identical electrical and mechanical specifications to the F30J3R0E but without ROHS3 compliance. Selection of this part depends on application requirements and regulatory constraints.

Both substitute parts feature reduced physical dimensions (1.250" length versus 4.600" for the F55J3R0), which may impact PCB layout and thermal management considerations in space-constrained designs.

Frequently Asked Questions (FAQ)

Q: Can F30J3R0E or F30J3R0 be used as direct replacements for F55J3R0?

A: Both parts are electrically equivalent in terms of resistance value, tolerance, temperature coefficient, and operating temperature range. The primary consideration is power dissipation capacity. The 30W rating of the substitute parts is lower than the 55W rating of the F55J3R0. Substitution is valid only if the application's actual power dissipation does not exceed 30W.

Q: What is the difference between F30J3R0E and F30J3R0?

A: Both parts are identical in electrical and mechanical specifications. The F30J3R0E carries ROHS3 compliance certification, while the F30J3R0 does not. Selection depends on regulatory and compliance requirements for the end application.

Q: Are the physical dimensions compatible?

A: The substitute parts are shorter (1.250" length) compared to the F55J3R0 (4.600" length), though the width and height remain identical. PCB layout and mounting bracket designs must accommodate this dimensional change.

Q: Do the substitute parts maintain the same temperature performance?

A: Yes. Both F30J3R0E and F30J3R0 operate across the same temperature range (-55°C to 350°C) with identical temperature coefficient (±400ppm/°C) as the F55J3R0.

Q: What is the impact of the lower power rating on thermal management?

A: The 30W rating indicates lower heat generation at rated power. Applications operating below 30W will experience reduced thermal stress compared to the 55W-rated F55J3R0. Thermal design calculations must be based on actual application power dissipation requirements.