HS25 75R J Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The HS25 75R J is a 25-watt wirewound chassis mount resistor manufactured by Ohmite, rated at 75 ohms with ±5% tolerance. This component is designed for high-power applications requiring reliable pulse withstanding capability and thermal stability. The part is currently in active production status with 694 units in stock. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this resistor category.

Substiute Parts

HS25 75R J

OhmiteIn Stock: 753HS25 75R J Datasheet

Current PartRFQ

HS25 75R F

OhmiteIn Stock: 1450HS25 75R F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HS25 75R J is determined by the following critical parameters:

• Resistance Value: Must be 75 ohms
• Power Rating: Must be 25W minimum
• Composition: Must be wirewound construction
• Housing Type: Must be aluminum with flanges for mechanical compatibility
• Lead Style: Must use solder lugs for connection compatibility
• Mounting Configuration: Must support chassis mount installation

The HS25 75R F qualifies as a parametric equivalent because it maintains identical resistance, power rating, composition, housing type, lead style, and mounting configuration. Tolerance variation (±1% versus ±5%) represents an improvement in precision and does not prevent substitution. Dimensional differences in width (0.559" versus 1.102") remain within acceptable mechanical envelope constraints for chassis mount applications.

Parameter Comparison

Engineering Selection Recommendations

Both the HS25 75R J and HS25 75R F are active production components with full RoHS compliance certifications. The HS25 75R F offers enhanced regulatory compliance through ROHS3 certification and improved tolerance specification at ±1%, making it suitable for applications requiring tighter resistance accuracy. The HS25 75R J remains the primary specification when ±5% tolerance meets circuit requirements. Selection between these parts should be based on tolerance requirements and regulatory compliance mandates specific to the end application. Both components maintain identical electrical performance characteristics and mechanical mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Can the HS25 75R F replace the HS25 75R J in existing designs?

A: Yes. The HS25 75R F maintains identical resistance value, power rating, composition, housing type, and mounting configuration. The tighter ±1% tolerance of the HS25 75R F is compatible with applications specified for ±5% tolerance.

Q: What is the significance of the tolerance difference between these parts?

A: The HS25 75R J specifies ±5% tolerance, while the HS25 75R F specifies ±1% tolerance. The ±1% tolerance represents improved precision and is suitable for circuits requiring tighter resistance accuracy. Both tolerances are compatible for substitution purposes.

Q: Are there dimensional differences between these resistors?

A: Yes. The HS25 75R J measures 1.075" L x 1.102" W, while the HS25 75R F measures 1.075" L x 0.559" W. Both share identical height (0.583" seated maximum) and mounting flange configuration. Width variation does not affect chassis mount compatibility.

Q: What is the difference between Box and Bulk packaging?

A: Box packaging (HS25 75R J) and Bulk packaging (HS25 75R F) represent different distribution formats. Bulk packaging typically offers higher unit quantities per container. Functional performance and electrical specifications remain identical regardless of packaging format.

Q: Are both parts RoHS compliant?

A: Yes. The HS25 75R J is RoHS Compliant, and the HS25 75R F is ROHS3 Compliant. Both meet environmental and regulatory requirements for restricted substance use.

Q: Which part should be selected for new designs?

A: Selection depends on tolerance requirements and regulatory compliance mandates. The HS25 75R F with ±1% tolerance and ROHS3 compliance is suitable for applications requiring enhanced precision and regulatory alignment. The HS25 75R J remains appropriate when ±5% tolerance satisfies circuit specifications.