Ohmite 45F500 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F500 is a 500 Ohm ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently in active production status. Substitute parts may be required due to inventory constraints, regional availability, or specific application requirements such as RoHS compliance or enhanced moisture resistance.

Substiute Parts

45F500

OhmiteIn Stock: 81445F500 Datasheet

Current PartRFQ

ALSR05500R0FE12

Vishay DaleIn Stock: 855ALSR05500R0FE12 Datasheet

DirectRFQ

RS005500R0FS73

Vishay DaleIn Stock: 1316RS005500R0FS73 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 45F500 are qualified based on the following electrical and mechanical parameters:

• Resistance value: 500 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 5W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial through-hole (exact match required)
• Number of terminations: 2 (exact match required)

The following substitute parts meet these core criteria:

1. Vishay Dale ALSR05500R0FE12 — Direct substitute with moisture-resistant construction
2. Vishay Dale RS005500R0FS73 — Manufacturer-recommended substitute with moisture-resistant construction

Parameter Comparison

Engineering Selection Recommendations

Vishay Dale ALSR05500R0FE12 is suitable for applications requiring RoHS3 compliance. This part offers moisture-resistant construction and an extended operating temperature range of -65°C to 250°C. The temperature coefficient of ±30ppm/°C is slightly higher than the original part but remains within acceptable tolerance for most applications. Physical dimensions are slightly smaller than the original.

Vishay Dale RS005500R0FS73 is the manufacturer-recommended substitute and maintains the same temperature coefficient (±20ppm/°C) as the original Ohmite 45F500. This part also provides moisture-resistant construction and an extended operating temperature range. However, it retains RoHS non-compliant status. This option is preferred when temperature coefficient matching is critical.

Both substitute parts are electrically and mechanically compatible with the original specification for resistance, tolerance, power rating, and axial package configuration.

Frequently Asked Questions (FAQ)

Q: Can I use Vishay Dale ALSR05500R0FE12 as a direct replacement for Ohmite 45F500?

A: Yes. Both parts share identical electrical specifications: 500 Ohms, ±1% tolerance, and 5W power rating in axial wirewound construction. The ALSR05500R0FE12 has a slightly higher temperature coefficient (±30ppm/°C vs. ±20ppm/°C) and smaller physical dimensions, but these differences do not affect functional compatibility in standard applications.

Q: What is the difference between the two substitute parts?

A: The primary differences are RoHS compliance status and temperature coefficient. The ALSR05500R0FE12 is ROHS3 compliant with a ±30ppm/°C temperature coefficient, while the RS005500R0FS73 is RoHS non-compliant but maintains the original ±20ppm/°C temperature coefficient. Both offer moisture-resistant construction.

Q: Will the smaller physical dimensions of the substitute parts affect my circuit board layout?

A: The substitute parts (0.312" Dia x 0.875" L) are slightly smaller than the original (0.343" Dia x 0.937" L). Verify that your PCB layout and mechanical constraints accommodate these dimensions before substitution.

Q: Which substitute should I choose for a new design?

A: Selection depends on compliance requirements. For RoHS3-compliant designs, use ALSR05500R0FE12. For applications where temperature coefficient precision is critical and RoHS compliance is not required, use RS005500R0FS73.

Q: Are all three parts suitable for high-temperature applications?

A: The Ohmite 45F500 does not specify an operating temperature range. Both Vishay Dale substitutes are rated for -65°C to 250°C operation, making them suitable for extended temperature applications.