850F500 Equivalent & Substitute Parts

Part Overview

The Ohmite 850F500 is a 500 Ohms ±1% 50W wirewound chassis mount resistor with aluminum housing and solder lug termination. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing production and maintenance applications. Active alternatives with identical electrical specifications are available from both the original manufacturer and qualified cross-reference suppliers.

Substiute Parts

850F500

OhmiteIn Stock: 837850F500 Datasheet

Current PartRFQ

850F500E

OhmiteIn Stock: 1242850F500E Datasheet

DirectRFQ

RH050500R0FC02

Vishay DaleIn Stock: 880RH050500R0FC02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 850F500 is determined by matching the following critical parameters: 500 Ohms resistance value, ±1% tolerance, 50W power rating, wirewound composition, ±20ppm/°C temperature coefficient, flanged chassis mount configuration, and solder lug termination. Two qualified substitutes meet these electrical and mechanical requirements:

850F500E (Ohmite) — Direct manufacturer equivalent with identical specifications and active product status.

RH050500R0FC02 (Vishay Dale) — Cross-manufacturer substitute meeting all core electrical parameters with equivalent mechanical form factor and mounting compatibility.

Parameter Comparison

Engineering Selection Recommendations

850F500E (Ohmite) is the primary substitute for the obsolete 850F500. This part is manufactured by the original equipment supplier, maintains identical electrical and mechanical specifications, and carries ROHS3 compliance certification. It is suitable for all applications where the original part was specified.

RH050500R0FC02 (Vishay Dale) serves as a qualified cross-manufacturer alternative. This part meets all core electrical parameters and mechanical mounting requirements. The operating temperature maximum is reduced to 250°C compared to the original 275°C specification. This part is non-compliant with RoHS requirements and is subject to REACH regulations. Selection of this substitute requires confirmation that the reduced upper temperature limit does not conflict with application requirements.

Frequently Asked Questions (FAQ)

Q: Can the 850F500E directly replace the obsolete 850F500? A: Yes. The 850F500E is an active equivalent from the original manufacturer with identical electrical specifications, mechanical dimensions, and mounting configuration. It is a direct drop-in replacement.

Q: What is the primary difference between the 850F500E and RH050500R0FC02? A: Both parts meet the core electrical specifications of 500 Ohms ±1% at 50W. The RH050500R0FC02 has a maximum operating temperature of 250°C versus 275°C for the 850F500E. The 850F500E carries ROHS3 compliance; the RH050500R0FC02 does not.

Q: Are there dimensional differences between the substitutes? A: Dimensional variations are minimal. The 850F500 and 850F500E are 1.938" L × 1.156" W with 0.620" seated height. The RH050500R0FC02 is 1.968" L × 1.140" W with 0.625" seated height. These differences are within typical mechanical tolerances for flanged chassis mount resistors and do not affect mounting compatibility.

Q: Which substitute should be selected for new designs? A: The 850F500E is recommended for new designs due to active product status, ROHS3 compliance, and full temperature range specification matching the original part.

Q: Can the RH050500R0FC02 be used in applications requiring operation above 250°C? A: No. The RH050500R0FC02 is rated to a maximum of 250°C. Applications requiring operation to 275°C must use the 850F500E.