F30J250 Equivalent & Substitute Parts Reference

Part Overview

The F30J250 is a 250 Ohms ±5% 30W wirewound chassis mount resistor manufactured by Ohmite in the Stackohm® 250 series. This component is designed for high-power applications requiring reliable thermal dissipation and mechanical stability through flange-braced mounting. The part is currently active in production with 804 units in stock. Substitute parts are identified when packaging configurations differ or when compliance requirements necessitate alternative sourcing while maintaining identical electrical and mechanical specifications.

Substiute Parts

F30J250

OhmiteIn Stock: 853F30J250 Datasheet

Current PartRFQ

F30J250E

OhmiteIn Stock: 912F30J250E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the F30J250 is determined by strict equivalence across all critical electrical and mechanical parameters. The primary substitution criterion is identical resistance value (250 Ohms), tolerance (±5%), power rating (30W), composition (wirewound), temperature coefficient (±260ppm/°C), operating temperature range (-55°C to 350°C), coating type (vitreous enamel), mounting configuration (flange braces, right angle), physical dimensions (1.250" L × 1.000" W), seated height (0.563"), lead style (solder lugs), and package type (radial, flat oval). Packaging format (bulk versus standard) does not affect electrical or mechanical compatibility and therefore does not preclude substitution. Compliance certifications (RoHS status, MSL rating) may differ between equivalent parts and should be evaluated based on application requirements.

Parameter Comparison

Engineering Selection Recommendations

The F30J250E is a direct parametric equivalent to the F30J250, with all electrical and mechanical specifications identical. The primary distinction is compliance status: the F30J250E is ROHS3 compliant with MSL rating 1 (unlimited), while the F30J250 is RoHS non-compliant with MSL not applicable. Selection between these parts should be based on application compliance requirements. For applications requiring RoHS3 compliance, the F30J250E is the appropriate choice. For applications without RoHS compliance mandates, either part is electrically and mechanically interchangeable. Packaging format (bulk for F30J250E versus standard for F30J250) does not affect circuit performance or installation compatibility.

Frequently Asked Questions (FAQ)

Q: Can F30J250E be used as a direct replacement for F30J250? A: Yes. The F30J250E is electrically and mechanically identical to the F30J250. All critical parameters—resistance, tolerance, power rating, temperature coefficient, operating range, dimensions, and mounting configuration—are equivalent. The parts differ only in packaging format and compliance certifications.

Q: What is the difference between the standard and bulk packaging options? A: Packaging format refers to the quantity and presentation method for shipment. Standard packaging (F30J250) and bulk packaging (F30J250E) do not affect the component's electrical performance, mechanical fit, or installation procedure. Selection depends on procurement volume requirements and inventory management practices.

Q: Does RoHS compliance affect circuit performance? A: No. RoHS compliance is a regulatory and material composition requirement, not an electrical specification. Both RoHS-compliant and non-compliant versions of this resistor deliver identical electrical and thermal performance. Selection should be based on application regulatory requirements.

Q: Are the physical dimensions identical between F30J250 and F30J250E? A: Yes. Both parts have identical dimensions: 1.250" L × 1.000" W (31.75mm × 25.40mm) with a maximum seated height of 0.563" (14.29mm). They are mechanically interchangeable in all mounting applications.

Q: What does MSL rating mean for this component? A: Moisture Sensitivity Level (MSL) indicates the component's sensitivity to moisture during storage and handling. The F30J250 has MSL not applicable, while the F30J250E has MSL 1 (unlimited), indicating no moisture-related storage restrictions. This does not affect electrical performance or circuit compatibility.