Ohmite 45J12RE Equivalent & Substitute Parts

Part Overview

The Ohmite 45J12RE is a 12 Ohm, 5% tolerance, 5W through-hole axial wirewound resistor from the Ohmicone® 40 series. This component is designed for general-purpose power dissipation applications requiring reliable performance in standard industrial and commercial environments. The part maintains active product status with 1006 units currently in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, application-specific tolerance requirements, or design optimization needs.

Substiute Parts

45J12RE

OhmiteIn Stock: 110645J12RE Datasheet

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45F12RE

OhmiteIn Stock: 83645F12RE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The Ohmite 45F12RE qualifies as a direct substitute for the 45J12RE based on the following criteria:

Matching Parameters:

• Resistance value: 12 Ohms (identical)
• Power rating: 5W (identical)
• Composition: Wirewound (identical)
• Package type: Axial (identical)
• Physical dimensions: 0.343" Dia x 0.937" L (identical)
• Temperature coefficient: ±20ppm/°C (identical)
• Series: Ohmicone® 40 (identical)
• Compliance: ROHS3 Compliant (identical)

Distinguishing Parameter:

• Tolerance: 45F12RE provides ±1% tolerance versus ±5% tolerance of the 45J12RE

The 45F12RE represents an upgrade path where tighter tolerance specifications are required while maintaining all other electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the 45J12RE and 45F12RE are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory compliance for current applications. The selection between these parts depends on tolerance requirements:

• 45J12RE (±5% tolerance): Suitable for general-purpose applications where standard tolerance specifications are acceptable and cost optimization is a priority.

• 45F12RE (±1% tolerance): Appropriate for precision circuits requiring tighter resistance value control and improved circuit performance stability.

Both components share identical mechanical footprints, power ratings, and thermal characteristics, enabling direct substitution at the board level without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the 45F12RE replace the 45J12RE in existing designs?

A: Yes. The 45F12RE is mechanically and electrically compatible with the 45J12RE. Both components feature identical axial package dimensions, 5W power ratings, and ±20ppm/°C temperature coefficients. The primary difference is tolerance specification.

Q: What is the tolerance difference between these parts?

A: The 45J12RE provides ±5% tolerance, while the 45F12RE provides ±1% tolerance. Both are wirewound resistors with 12 Ohm nominal resistance. Tighter tolerance improves resistance value accuracy.

Q: Are both parts RoHS compliant?

A: Yes. Both the 45J12RE and 45F12RE are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Do these parts require different PCB footprints?

A: No. Both components share identical physical dimensions of 0.343" diameter by 0.937" length (8.70mm x 23.80mm), requiring no PCB layout changes for substitution.

Q: Which part should I select for new designs?

A: Selection depends on circuit tolerance requirements. For applications requiring precision resistance values, the 45F12RE (±1%) is appropriate. For general-purpose applications, the 45J12RE (±5%) is suitable.