Ohmite 45F75RE Equivalent & Substitute Parts

Part Overview

The Ohmite 45F75RE is a 75 Ohm ±1% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is actively manufactured and stocked with 833 units available. The part is ROHS3 compliant and REACH unaffected, making it suitable for modern electronic applications requiring precision resistive elements in axial package format.

Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the critical parameters that define functional interchangeability in this resistor category.

Substiute Parts

45F75RE

OhmiteIn Stock: 86545F75RE Datasheet

Current PartRFQ

UB5C-75RF1

RiedonIn Stock: 4355UB5C-75RF1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 45F75RE is determined by strict equivalence across the following critical parameters:

• Resistance value: 75 Ohms
• Tolerance: ±1%
• Power rating: 5W
• Composition: Wirewound
• Package configuration: Axial with 2 terminations
• Temperature coefficient: ±20ppm/°C
• Regulatory compliance: ROHS3 compliant

The Riedon UB5C-75RF1 meets all these core electrical and mechanical requirements, establishing it as a qualified substitute. Additional features present in the substitute part (current sense capability, flame proof construction, moisture resistance, pulse withstanding, and safety certification) represent functional enhancements that do not compromise interchangeability.

Parameter Comparison

Engineering Selection Recommendations

Both the Ohmite 45F75RE and Riedon UB5C-75RF1 are active products with ROHS3 compliance and REACH unaffected status. Selection between these parts should be based on:

• Physical space constraints: The Riedon UB5C-75RF1 has a smaller footprint (0.250" diameter × 0.500" length versus 0.343" diameter × 0.937" length), making it suitable for compact board layouts.
• Operating temperature range: The Riedon part specifies -55°C to 250°C operating range, providing defined thermal boundaries for applications requiring extended temperature operation.
• Feature requirements: The Riedon UB5C-75RF1 includes current sense, flame proof, moisture resistant, pulse withstanding, and safety certifications as standard features.
• Inventory availability: The Riedon UB5C-75RF1 has higher stock availability (4255 units) compared to the Ohmite part (833 units).

Both parts carry identical electrical specifications and regulatory certifications, ensuring functional equivalence in standard circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the Riedon UB5C-75RF1 directly replace the Ohmite 45F75RE in existing designs?

A: Yes. Both parts share identical resistance (75 Ohms), tolerance (±1%), power rating (5W), temperature coefficient (±20ppm/°C), and axial package configuration with 2 terminations. Electrical performance is equivalent. Physical dimensions differ, so PCB layout compatibility must be confirmed.

Q: What is the significance of the smaller physical size of the Riedon part?

A: The Riedon UB5C-75RF1 measures 0.250" diameter × 0.500" length, compared to the Ohmite part at 0.343" diameter × 0.937" length. The smaller footprint allows placement in space-constrained applications but requires verification that the PCB layout accommodates the different dimensions.

Q: Are there compliance differences between these parts?

A: No. Both parts are ROHS3 compliant and REACH unaffected. They carry identical regulatory status and are suitable for applications with equivalent compliance requirements.

Q: What additional features does the Riedon part provide?

A: The Riedon UB5C-75RF1 includes current sense capability, flame proof construction, moisture resistance, pulse withstanding characteristics, and safety certification. These features do not affect basic substitution eligibility but may provide additional performance margins in demanding applications.

Q: How should operating temperature range be considered in part selection?

A: The Riedon UB5C-75RF1 specifies -55°C to 250°C operating range. The Ohmite part does not provide an operating temperature specification in the available data. For applications with defined temperature requirements, the Riedon part's specified range provides explicit thermal boundaries.