Ohmite 45JR25 Equivalent & Substitute Parts

Part Overview

The Ohmite 45JR25 is a 250 mOhms ±5% 5W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is designed for applications requiring precision current-sensing and power dissipation in compact form factors. The part maintains active product status with 1076 units in current inventory. Substitute parts are identified to address packaging preferences, compliance requirements, and supply chain flexibility while maintaining identical electrical and mechanical specifications.

Substiute Parts

45JR25

OhmiteIn Stock: 114445JR25 Datasheet

Current PartRFQ

45JR25E

OhmiteIn Stock: 89845JR25E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute identification for the 45JR25 is based on strict parametric equivalence across all critical electrical and mechanical specifications. The primary substitution criterion is the maintenance of identical resistance value (250 mOhms), tolerance (±5%), power rating (5W), temperature coefficient (±90ppm/°C), and physical form factor (axial wirewound, 0.343" Dia x 0.937" L).

The 45JR25E qualifies as a parametric equivalent because it maintains all electrical characteristics and mechanical dimensions of the primary part. The distinction between these parts is limited to packaging configuration (standard vs. bulk) and RoHS compliance status. Both parts are manufactured by Ohmite within the same Ohmicone® 40 series and share identical ECCN (EAR99) and HTSUS (8533.21.0080) classifications.

Parameter Comparison

Engineering Selection Recommendations

Selection between 45JR25 and 45JR25E is determined by regulatory and procurement requirements rather than electrical performance.

The 45JR25 is suitable for applications where RoHS non-compliance is acceptable or where existing design qualifications specify this exact part number. This variant maintains standard packaging configuration.

The 45JR25E is required for applications subject to ROHS3 compliance mandates, including EU market deployment and OEM supply chains with RoHS requirements. The bulk packaging of 45JR25E supports high-volume manufacturing environments. Both parts maintain identical electrical performance, mechanical fit, and thermal characteristics within the specified operating envelope.

Frequently Asked Questions (FAQ)

Q: Can 45JR25E be used as a direct replacement for 45JR25 in existing designs?

A: Yes, from an electrical and mechanical standpoint. The 45JR25E maintains identical resistance (250 mOhms), tolerance (±5%), power rating (5W), temperature coefficient (±90ppm/°C), and physical dimensions (0.343" Dia x 0.937" L). The primary difference is RoHS3 compliance status. Verify that your application or regulatory environment does not mandate the original part number for traceability or qualification purposes.

Q: What is the difference between standard and bulk packaging for these parts?

A: Packaging configuration affects order quantities and handling procedures. Standard packaging (45JR25) is typical for smaller orders and mixed component shipments. Bulk packaging (45JR25E) is optimized for high-volume production runs and automated assembly processes. Electrical and mechanical specifications remain identical.

Q: Are there any thermal or performance differences between these substitutes?

A: No. Both parts share identical temperature coefficient (±90ppm/°C), power dissipation capability (5W), and resistance stability. Performance in thermal cycling, power cycling, and long-term reliability applications is equivalent.

Q: Which part should I specify for new designs?

A: Specify 45JR25E for new designs unless RoHS non-compliance is a specific design requirement. The ROHS3 compliance of 45JR25E provides broader market applicability and future-proofs designs against evolving regulatory requirements.

Q: Can these parts be used interchangeably on the same PCB assembly line?

A: Yes, provided your assembly process and quality control procedures do not require part number-specific traceability. Both parts are axial wirewound resistors with identical lead spacing and soldering characteristics. Verify with your manufacturing and quality documentation before implementing substitution in production.