F30J2R0 Wirewound Chassis Mount Resistor – Equivalent & Substitute Parts

Part Overview

The F30J2R0 is a 2 Ohms ±5% 30W wirewound chassis mount resistor manufactured by Ohmite, part of the Stackohm® 250 series. This component is designed for applications requiring precision resistance with high power dissipation capability in a compact chassis-mounted form factor. The part maintains Active product status with 990 units in current inventory. Substitute parts are identified when design requirements necessitate higher power ratings, alternative packaging configurations, or inventory availability considerations while maintaining core electrical and mechanical compatibility.

Substiute Parts

F30J2R0

OhmiteIn Stock: 1035F30J2R0 Datasheet

Current PartRFQ

F55J2R0

OhmiteIn Stock: 880F55J2R0 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

The F55J2R0 qualifies as a direct substitute based on the following alignment of critical parameters:

Electrical Compatibility:

• Identical resistance value: 2 Ohms
• Identical tolerance: ±5%
• Identical temperature coefficient: ±400ppm/°C
• Identical operating temperature range: -55°C to 350°C

Mechanical Compatibility:

• Identical composition: Wirewound
• Identical coating/housing type: Vitreous Enamel Coated
• Identical mounting feature: Flange Braces, Right Angle
• Identical lead style: Solder Lugs
• Identical package/case type: Radial, Flat Oval
• Identical height when seated: 0.563" (14.29mm)

Substitution Basis: The F55J2R0 provides an upgrade path with increased power dissipation capability (55W versus 30W) while maintaining all electrical and mechanical specifications. The increased length (4.600" versus 1.250") accommodates the higher power rating. Both parts share identical series designation, product status, and compliance classification.

Parameter Comparison

Engineering Selection Recommendations

F30J2R0 Selection Criteria: Select the F30J2R0 when the application requires a 30W power dissipation rating with compact form factor. This part is suitable for space-constrained designs where the 1.250" length is a design requirement. Both main part and substitute maintain identical Active product status and RoHS non-compliant classification.

F55J2R0 Selection Criteria: Select the F55J2R0 when the application requires higher power dissipation capability (55W) or when thermal margin improvement is necessary. The increased length accommodates the higher power rating while maintaining all electrical specifications and mounting compatibility. This part provides an upgrade path for designs requiring enhanced thermal performance.

Compliance Considerations: Both parts share identical RoHS non-compliance status and REACH classification (REACH Unaffected). Component selection should be based on power dissipation requirements and available board space, as all other electrical and mechanical parameters remain constant.

Frequently Asked Questions (FAQ)

Q: Can F55J2R0 be used as a direct replacement for F30J2R0? A: Yes. The F55J2R0 maintains identical electrical specifications (2 Ohms ±5%, ±400ppm/°C, -55°C to 350°C operating range) and mechanical mounting features (flange braces, right angle, solder lugs, radial flat oval package). The primary difference is increased power rating (55W versus 30W) and increased length (4.600" versus 1.250"). Verify available board space before substitution.

Q: What is the key difference between these two parts? A: The primary difference is power dissipation capability. The F55J2R0 is rated for 55W compared to the F30J2R0's 30W rating. This increased power capacity is accommodated by a longer physical length (4.600" versus 1.250"), while height and width dimensions remain identical. All electrical parameters are identical.

Q: Are there any mounting compatibility issues when substituting F55J2R0 for F30J2R0? A: No mounting compatibility issues exist. Both parts use identical mounting features (flange braces, right angle), lead style (solder lugs), and package type (radial, flat oval). The seated height is identical at 0.563" (14.29mm). The only dimensional change is length, which must be accommodated in the PCB layout.

Q: Do these parts have different compliance or certification status? A: No. Both parts share identical RoHS non-compliance status and REACH classification (REACH Unaffected). Compliance considerations are equivalent between the two parts.

Q: Which part should be selected for thermal margin improvement? A: The F55J2R0 provides superior thermal performance due to its 55W power rating versus the F30J2R0's 30W rating. Select F55J2R0 when design analysis indicates thermal margin improvement is necessary or when actual power dissipation approaches the 30W limit of the original part.