HS300 5R F Equivalent & Substitute Parts

Part Overview

The HS300 5R F is a 300-watt wirewound chassis mount resistor manufactured by Ohmite, rated at 5 ohms with ±1% 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 1044 units in stock. Substitute parts become necessary when application constraints such as space limitations, thermal management requirements, or inventory availability necessitate alternative configurations while maintaining core electrical performance.

Substiute Parts

HS300 5R F

OhmiteIn Stock: 1120HS300 5R F Datasheet

Current PartRFQ

HS250 5R F

OhmiteIn Stock: 1250HS250 5R F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The HS250 5R F qualifies as a parametric equivalent based on the following matching electrical and mechanical parameters:

• Resistance value: 5 Ohms (identical)
• Tolerance: ±1% (identical)
• Composition: Wirewound (identical)
• Temperature Coefficient: ±100ppm/°C (equivalent specification)
• Housing Type: Aluminum (identical)
• Mounting Feature: Flanges (identical)
• Lead Style: M6 Threaded (identical)
• RoHS Compliance: Both parts meet regulatory requirements

The primary difference is power rating: the HS250 5R F is rated at 250W versus the 300W rating of the HS300 5R F. This substitution is valid only when application power dissipation requirements do not exceed 250 watts. Physical dimensions differ due to the reduced power rating, with the HS250 5R F measuring 4.319" L x 1.791" W compared to 5.028" L x 2.854" W for the HS300 5R F.

Parameter Comparison

Engineering Selection Recommendations

Selection between the HS300 5R F and HS250 5R F depends on application power dissipation requirements:

Use the HS300 5R F when continuous or peak power dissipation exceeds 250 watts. This part provides the full 300-watt capacity with RoHS compliance certification.

Use the HS250 5R F when application power dissipation remains at or below 250 watts. This substitute offers ROHS3 compliance, improved inventory availability (1177 units versus 1044 units), and reduced physical footprint due to lower power rating. The identical electrical specifications (5 ohms, ±1% tolerance, wirewound composition, M6 threaded leads) ensure functional compatibility within the stated power constraint.

Both parts maintain identical height dimensions (1.646" seated maximum), facilitating potential retrofit applications where vertical space is constrained but horizontal space permits the dimensional reduction of the HS250 5R F.

Frequently Asked Questions (FAQ)

Q: Can the HS250 5R F replace the HS300 5R F in all applications?

A: No. The HS250 5R F is suitable only for applications where power dissipation does not exceed 250 watts. Verify actual power dissipation (P = I²R) before substitution. Exceeding the 250-watt rating will result in component failure.

Q: Are the electrical specifications identical between these parts?

A: Yes. Both parts provide 5 ohms resistance at ±1% tolerance with wirewound composition and 100ppm/°C temperature coefficient. Electrical performance is equivalent within their respective power ratings.

Q: What are the physical dimension differences?

A: The HS250 5R F is smaller in length and width due to its reduced power rating. Length: 4.319" versus 5.028"; Width: 1.791" versus 2.854". Height remains identical at 1.646" maximum seated height. Verify mounting space availability before substitution.

Q: Do both parts meet RoHS requirements?

A: Yes. The HS300 5R F carries RoHS Compliant certification. The HS250 5R F carries ROHS3 Compliant certification. Both meet regulatory requirements for restricted substance compliance.

Q: What is the difference in packaging?

A: The HS300 5R F is supplied in box packaging. The HS250 5R F is supplied in bulk packaging. Confirm packaging requirements for your procurement and assembly processes.

Q: Are the M6 threaded leads compatible between both parts?

A: Yes. Both parts use identical M6 threaded lead style, ensuring mechanical compatibility with existing mounting hardware and terminal connections.