Ohmite 604HR025 Equivalent & Substitute Parts

Part Overview

The Ohmite 604HR025 is a 25 mOhms ±3% through-hole axial resistor rated at 0.375W (3/8W) with metal element composition. Designed for current sense applications, this component features flame-proof and non-inductive characteristics suitable for safety-critical circuits. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives to maintain design continuity and ensure supply chain availability for new production and repair applications.

Substiute Parts

604HR025

OhmiteIn Stock: 799604HR025 Datasheet

Current PartRFQ

604HR025E

OhmiteIn Stock: 845604HR025E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 604HR025 is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part 604HR025E maintains identical specifications for resistance value, tolerance, power rating, composition, package configuration, and physical dimensions. Both parts belong to the Ohmite 60 series and share identical functional characteristics including current sense capability, flame-proof construction, and non-inductive design. The primary distinction is product status: the original part is obsolete while the substitute is active, and packaging differs between tape/reel and bulk formats. Compliance certifications differ, with the substitute offering improved RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

The 604HR025E is the direct functional equivalent of the 604HR025. Both parts are manufactured by Ohmite and share identical electrical and mechanical specifications. Selection between these parts is determined by availability and compliance requirements. The 604HR025 is obsolete and should not be specified for new designs. The 604HR025E is the active production part and is recommended for all applications requiring a 25 mOhm ±3% axial resistor with 0.375W power rating and current sense characteristics. The 604HR025E offers improved regulatory compliance with ROHS3 certification, making it suitable for applications subject to RoHS requirements. Both parts maintain identical REACH and ECCN classifications.

Frequently Asked Questions (FAQ)

Q: Can the 604HR025E directly replace the 604HR025 in existing designs? A: Yes. The 604HR025E is electrically and mechanically identical to the 604HR025. All critical parameters including resistance, tolerance, power rating, package type, and physical dimensions are equivalent. Direct substitution is possible without circuit modification.

Q: What is the difference between the 604HR025 and 604HR025E? A: The primary differences are product status and packaging format. The 604HR025 is obsolete and supplied in tape/reel format. The 604HR025E is an active production part supplied in bulk packaging. The 604HR025E also carries ROHS3 compliance certification, whereas the 604HR025 is RoHS non-compliant.

Q: Are there any compatibility concerns when switching from 604HR025 to 604HR025E? A: No compatibility concerns exist. Both parts are axial through-hole resistors with identical lead spacing, physical dimensions (0.250" length), and termination configuration. PCB layouts and assembly processes require no modification.

Q: Does the 604HR025E meet current regulatory requirements? A: Yes. The 604HR025E is ROHS3 compliant and REACH unaffected, meeting current regulatory standards for electronic components in most jurisdictions.

Q: What is the significance of the metal element composition for these parts? A: Metal element composition provides the non-inductive characteristics and flame-proof construction required for current sense applications. This composition is maintained in both the 604HR025 and 604HR025E.