Equivalent & Substitute Parts for 805F300

Part Overview

The Ohmite 805F300 is a 300 Ohms ±1% 5W wirewound chassis mount resistor from the Metal-Mite®89 series. This component is classified as obsolete, making substitute parts necessary for new designs and ongoing production requirements. The 805F300 features aluminum housing with flanged mounting and solder lug termination, suitable for applications requiring precision resistance with moderate power dissipation in compact form factors.

Substiute Parts

805F300

OhmiteIn Stock: 1124805F300 Datasheet

Current PartRFQ

RH005300R0FC02

Vishay DaleIn Stock: 1047RH005300R0FC02 Datasheet

DirectRFQ

UAL5-300RF8

RiedonIn Stock: 1208UAL5-300RF8 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 805F300 is determined by the following critical parameters:

• Resistance value: 300 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Composition: Wirewound (exact match required)
• Temperature Coefficient: ±20ppm/°C (exact match required)
• Mounting Feature: Flanges with solder lugs (exact match required)
• Housing Type: Aluminum (exact match required)
• Package/Case: Axial, Box (exact match required)

The identified substitute parts meet all critical electrical and mechanical parameters. Power rating may exceed the original specification (7.5W vs. 5W), which is acceptable as higher power ratings provide design margin. Operating temperature ranges and physical dimensions remain within compatible tolerances for direct substitution in existing designs.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are active products with current manufacturing support, addressing the obsolescence of the 805F300.

RH005300R0FC02 (Vishay Dale) maintains the same operating temperature upper limit of 250°C, which is 25°C lower than the original specification. This part is RoHS non-compliant and REACH Affected.

UAL5-300RF8 (Riedon) extends the operating temperature range to 275°C, matching the original 805F300 specification. This part is ROHS3 Compliant and REACH Unaffected, providing environmental compliance advantages for new designs and regulated applications.

Selection between these substitutes depends on application temperature requirements and regulatory compliance mandates. For applications requiring the full -55°C ~ 275°C operating range with modern environmental compliance, UAL5-300RF8 is the preferred selection.

Frequently Asked Questions (FAQ)

Q: Can RH005300R0FC02 be used in applications requiring operation above 250°C?

A: No. RH005300R0FC02 has a maximum operating temperature of 250°C, which is 25°C below the original 805F300 specification of 275°C. Applications requiring the full temperature range must use UAL5-300RF8.

Q: Are the physical dimensions of substitute parts compatible with the original 805F300 footprint?

A: Yes. Both substitute parts maintain the same length (0.600"), width (0.646"), and height within 0.005" of the original specification. Direct mechanical substitution is supported.

Q: What is the significance of the higher power ratings (7.5W vs. 5W) in the substitute parts?

A: Higher power ratings provide additional thermal margin and design flexibility. A 7.5W-rated component can safely dissipate the same 5W power level as the original part with improved reliability and thermal performance.

Q: Which substitute part is recommended for new designs?

A: UAL5-300RF8 is recommended for new designs due to ROHS3 compliance, REACH Unaffected status, and full operating temperature range compatibility with the original specification.

Q: Are there differences in moisture resistance between the substitute parts?

A: RH005300R0FC02 includes moisture resistant features. UAL5-300RF8 specifies MSL 1 (Unlimited) moisture sensitivity level. Both are suitable for standard industrial environments.