45J39RE Equivalent & Substitute Parts

Part Overview

The 45J39RE is a 5W wirewound axial resistor with 39 Ohms resistance and ±5% tolerance, manufactured by Ohmite as part of the Ohmicone® 40 series. This component is designed for through-hole applications requiring reliable power dissipation in industrial and electronic equipment. The part maintains active product status with full RoHS compliance and unlimited moisture sensitivity rating. Substitute parts are identified when tighter tolerance specifications or alternative packaging configurations are required for specific circuit applications.

Substiute Parts

45J39RE

OhmiteIn Stock: 103445J39RE Datasheet

Current PartRFQ

45F39RE

OhmiteIn Stock: 121145F39RE Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

The 45F39RE qualifies as a direct substitute for the 45J39RE based on the following critical parameters:

• Resistance Value: Both parts specify 39 Ohms, ensuring identical nominal resistance in circuit applications
• Power Rating: Both rated at 5W, maintaining equivalent thermal dissipation capability
• Composition & Package: Both are wirewound axial resistors with identical physical dimensions (0.343" Dia × 0.937" L)
• Operating Temperature Range: Both support -55°C to 275°C operation
• Temperature Coefficient: Both maintain ±20ppm/°C stability
• Compliance: Both are RoHS compliant with MSL 1 rating

The primary distinction is tolerance specification: the 45F39RE provides ±1% tolerance compared to the 45J39RE's ±5% tolerance, representing an upgrade in precision capability while maintaining all other electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the 45J39RE and 45F39RE are active products with full RoHS compliance and identical regulatory certifications (ECCN: EAR99, HTSUS: 8533.21.0080). Selection between these parts depends on circuit tolerance requirements:

• 45J39RE: Suitable for applications where ±5% tolerance meets circuit specifications and standard precision is acceptable
• 45F39RE: Appropriate for applications requiring tighter tolerance control at ±1%, providing enhanced precision without compromising thermal or environmental performance

Both parts maintain identical physical footprints, thermal characteristics, and operating ranges, ensuring direct substitution capability in through-hole PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the 45F39RE replace the 45J39RE in existing designs? A: Yes. The 45F39RE is a direct mechanical and electrical substitute with identical dimensions, power rating, and operating temperature range. The ±1% tolerance of the 45F39RE is tighter than the ±5% tolerance of the 45J39RE, making it suitable for any application currently using the 45J39RE.

Q: What is the primary difference between these two parts? A: The tolerance specification differs: 45J39RE provides ±5% tolerance while 45F39RE provides ±1% tolerance. All other electrical and mechanical parameters are identical.

Q: Are both parts RoHS compliant? A: Yes. Both the 45J39RE and 45F39RE are RoHS compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Do these resistors have the same physical dimensions? A: Yes. Both parts measure 0.343" diameter × 0.937" length (8.70mm × 23.80mm), ensuring identical PCB footprint compatibility.

Q: What is the operating temperature range for both parts? A: Both parts operate across -55°C to 275°C with a temperature coefficient of ±20ppm/°C.

Q: Is there a packaging difference between these parts? A: Yes. The 45J39RE is supplied in Box packaging while the 45F39RE is supplied in Bulk packaging. This affects order quantities and handling but does not impact component performance or compatibility.