UB3C-750RF1 Equivalent & Substitute Parts

Part Overview

The UB3C-750RF1 is a 750 Ohm ±1% 3W axial wirewound resistor manufactured by Riedon. This through-hole component is designed for current sensing applications and features flame-proof, moisture-resistant, and pulse-withstanding characteristics. The part is currently active in production with 1115 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are required due to supply constraints, design flexibility, or inventory availability.

Substiute Parts

UB3C-750RF1

RiedonIn Stock: 1150UB3C-750RF1 Datasheet

Current PartRFQ

43F750E

OhmiteIn Stock: 83943F750E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The 43F750E manufactured by Ohmite qualifies as a direct substitute for the UB3C-750RF1 based on the following critical parameters:

• Resistance value: 750 Ohms (identical)
• Tolerance: ±1% (identical)
• Power rating: 3W (identical)
• Composition: Wirewound (identical)
• Package: Axial (identical)
• Temperature coefficient: ±20ppm/°C (identical)
• Moisture sensitivity level: 1 (Unlimited) (identical)

Both parts meet the same electrical and mechanical requirements for through-hole axial resistor applications. The 43F750E operates across an extended temperature range (-55°C ~ 275°C) compared to the UB3C-750RF1 (-55°C ~ 250°C), providing additional thermal margin in high-temperature environments.

Parameter Comparison

Engineering Selection Recommendations

Both the UB3C-750RF1 and 43F750E are active production components with full RoHS compliance. Selection between these parts should be based on the following factors:

The UB3C-750RF1 offers a more compact form factor (4.00mm diameter x 8.90mm length), making it suitable for space-constrained PCB layouts. The 43F750E provides a larger physical envelope (5.60mm diameter x 15.10mm length) but extends the maximum operating temperature to 275°C, offering enhanced thermal performance in elevated-temperature applications.

Both parts carry identical electrical specifications (750 Ohms ±1%, 3W, ±20ppm/°C) and meet the same compliance requirements (RoHS, EAR99, MSL 1). The choice between manufacturers depends on availability, lead time, and specific thermal or spatial requirements of the application.

Frequently Asked Questions (FAQ)

Q: Can the 43F750E replace the UB3C-750RF1 in all applications?

A: The 43F750E is electrically and functionally equivalent to the UB3C-750RF1 for all standard applications. However, the larger physical dimensions (5.60mm diameter x 15.10mm length versus 4.00mm x 8.90mm) must be verified against PCB layout constraints. The extended operating temperature range of the 43F750E (-55°C ~ 275°C) provides additional margin in high-temperature environments.

Q: Are there any compliance differences between these parts?

A: Both parts are RoHS compliant and carry the same ECCN classification (EAR99). The UB3C-750RF1 is ROHS3 compliant, while the 43F750E is RoHS compliant. Both maintain MSL 1 (Unlimited) moisture sensitivity ratings.

Q: What are the key parameters that define substitutability?

A: Direct substitution is based on matching resistance value (750 Ohms), tolerance (±1%), power rating (3W), composition (wirewound), package type (axial), and temperature coefficient (±20ppm/°C). Both parts meet these criteria.

Q: Does the physical size difference affect circuit performance?

A: The physical dimensions do not affect electrical performance. Size differences are relevant only for PCB layout compatibility and thermal dissipation characteristics in confined spaces. Both parts are rated for 3W power dissipation.

Q: Which part should be selected for new designs?

A: For new designs, either part is acceptable based on availability and application requirements. If thermal margin is critical, the 43F750E's extended temperature range (-55°C ~ 275°C) may be preferred. If space is constrained, the UB3C-750RF1's compact form factor is advantageous.