Ohmite 45F330E Equivalent & Substitute Parts

Part Overview

The Ohmite 45F330E is a 330 Ohms ±1% 5W through-hole resistor with axial wirewound construction from the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with high power dissipation capability. The part maintains Active product status with 771 units in current inventory. Equivalent and substitute parts are identified to support procurement flexibility, supply chain continuity, and application-specific feature requirements where the primary part may be unavailable or where enhanced specifications are beneficial.

Substiute Parts

45F330E

OhmiteIn Stock: 79645F330E Datasheet

Current PartRFQ

UB5C-330RF1

RiedonIn Stock: 1689UB5C-330RF1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 45F330E is determined by strict equivalence across the following critical parameters:

• Resistance value: 330 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-330RF1 meets all mandatory electrical and mechanical substitution criteria. This part is classified as a manufacturer-recommended equivalent and provides additional features including current sense capability, flame-proof construction, moisture resistance, and pulse withstanding characteristics. The UB5C-330RF1 operates across an extended temperature range (-55°C to 250°C) compared to the primary part and maintains MSL 1 moisture sensitivity rating.

Parameter Comparison

Engineering Selection Recommendations

Both the Ohmite 45F330E and Riedon UB5C-330RF1 are Active products with full ROHS3 compliance and REACH unaffected status, qualifying them for equivalent use in applications requiring 330 Ohms ±1% 5W axial wirewound resistors.

The Riedon UB5C-330RF1 is designated as the manufacturer-recommended substitute. Selection between these parts should consider physical space constraints, as the UB5C-330RF1 features a more compact form factor (0.250" diameter × 0.500" length versus 0.343" diameter × 0.937" length). The UB5C-330RF1 provides enhanced functional capabilities including current sense functionality, flame-proof construction, moisture resistance, and pulse withstanding characteristics. The extended operating temperature range of the UB5C-330RF1 (-55°C to 250°C) offers broader thermal application coverage.

Frequently Asked Questions (FAQ)

Q: Can the Riedon UB5C-330RF1 directly replace the Ohmite 45F330E in all applications?

A: Yes, the UB5C-330RF1 meets all core electrical and mechanical substitution criteria: 330 Ohms resistance, ±1% tolerance, 5W power rating, wirewound composition, axial package configuration, and ±20ppm/°C temperature coefficient. Both parts are ROHS3 compliant and REACH unaffected. Physical dimensions differ; verify PCB layout compatibility before substitution.

Q: What are the key differences between these two parts?

A: The primary differences are physical dimensions and additional features. The UB5C-330RF1 is more compact and includes current sense capability, flame-proof construction, moisture resistance, and pulse withstanding characteristics. The UB5C-330RF1 also specifies an extended operating temperature range (-55°C to 250°C) and MSL 1 moisture sensitivity rating.

Q: Are there any compliance or regulatory differences?

A: No. Both parts maintain identical regulatory status: ROHS3 compliant, REACH unaffected, and EAR99 ECCN classification with matching HTSUS codes (8533.21.0080).

Q: Does the smaller physical size of the UB5C-330RF1 affect electrical performance?

A: No. The electrical specifications remain equivalent: 330 Ohms ±1%, 5W power rating, and ±20ppm/°C temperature coefficient. Physical size reduction does not impact electrical performance for this component category.

Q: Which part should be selected for new designs?

A: Selection depends on application requirements and available inventory. The UB5C-330RF1 is the manufacturer-recommended equivalent and offers enhanced features and extended temperature range. The Ohmite 45F330E remains suitable for applications with standard operating conditions and where the larger form factor is acceptable.