45F39R Equivalent & Substitute Parts Reference

Part Overview

The Ohmite 45F39R is a 39 Ohm, 1% tolerance, 5W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with moderate power dissipation in compact axial form factor. The part is currently active in production with 860 units in stock. Substitute parts are identified when packaging, compliance status, or inventory availability requires alternative sourcing while maintaining identical electrical and mechanical specifications.

Substiute Parts

45F39R

OhmiteIn Stock: 95645F39R Datasheet

Current PartRFQ

45F39RE

OhmiteIn Stock: 121145F39RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 45F39RE qualifies as a direct substitute for the 45F39R based on identical electrical parameters: 39 Ohm resistance, ±1% tolerance, 5W power rating, wirewound composition, ±20ppm/°C temperature coefficient, and axial package configuration with matching physical dimensions (0.343" Dia x 0.937" L). The primary differences are packaging format (Bulk vs. standard) and compliance certifications. Both parts maintain the same functional performance in circuit applications requiring these specifications.

Parameter Comparison

Engineering Selection Recommendations

Selection between 45F39R and 45F39RE depends on regulatory and sourcing requirements. The 45F39R is suitable for applications without RoHS compliance mandates. The 45F39RE provides RoHS compliance and higher inventory availability (1180 units vs. 860 units), making it the preferred choice for designs requiring environmental compliance certification or when bulk packaging aligns with procurement workflows. Both parts deliver identical electrical performance and mechanical fit in axial through-hole applications. The 45F39RE specifies an operating temperature range of -55°C to 275°C, providing explicit thermal operating limits compared to the 45F39R specification.

Frequently Asked Questions (FAQ)

Q: Can 45F39RE replace 45F39R in existing designs? A: Yes. Both parts are electrically and mechanically identical with 39 Ohm resistance, ±1% tolerance, 5W power rating, and matching axial dimensions. The 45F39RE is a direct functional equivalent.

Q: What is the difference between standard and bulk packaging? A: Packaging format affects order quantities and handling. Standard packaging (45F39R) uses conventional component packaging, while bulk packaging (45F39RE) is suited for high-volume manufacturing environments. Electrical performance is identical.

Q: Does RoHS compliance affect circuit performance? A: No. RoHS compliance relates to material composition and environmental regulations, not electrical or thermal performance. Both parts function identically in circuit applications.

Q: Are the physical dimensions identical? A: Yes. Both 45F39R and 45F39RE measure 0.343" diameter by 0.937" length (8.70mm x 23.80mm), ensuring identical PCB layout compatibility and mounting clearance requirements.

Q: Which part should be selected for new designs? A: For new designs, the 45F39RE is recommended due to RoHS compliance status and higher inventory availability. For legacy designs or applications without compliance requirements, either part is functionally equivalent.