HS50 120R F Equivalent & Substitute Parts

Part Overview

The HS50 120R F is a 50-watt wirewound chassis mount resistor manufactured by Ohmite, rated at 120 ohms with ±1% tolerance. This component is designed for applications requiring high power dissipation with stable resistance values and pulse withstanding capability. The part maintains active product status with 791 units in current inventory. Substitute parts become necessary when design constraints require reduced power ratings, alternative packaging configurations, or when primary inventory availability is limited.

Substiute Parts

HS50 120R F

OhmiteIn Stock: 870HS50 120R F Datasheet

Current PartRFQ

HS25 120R F

OhmiteIn Stock: 972HS25 120R F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The HS25 120R F qualifies as a parametric equivalent based on the following criteria:

Matching Parameters (Substitution Basis):

• Resistance value: 120 Ohms (identical)
• Tolerance: ±1% (identical)
• Composition: Wirewound (identical)
• Housing type: Aluminum (identical)
• Mounting feature: Flanges (identical)
• Lead style: Solder Lugs (identical)
• Temperature coefficient: ±100ppm/°C (equivalent specification)
• Compliance: RoHS3 Compliant (meets or exceeds RoHS requirements)

Differing Parameter:

• Power rating: 25W (versus 50W in main part)

The HS25 120R F is suitable for applications where the 50W power dissipation requirement can be reduced to 25W without compromising circuit function. This substitution is valid only when thermal and power handling specifications permit the lower wattage rating.

Parameter Comparison

Engineering Selection Recommendations

Both the HS50 120R F and HS25 120R F maintain active product status with current manufacturing support. The HS50 120R F is the primary specification for applications requiring 50-watt power dissipation capability. The HS25 120R F serves as a substitute only when circuit design permits operation at 25-watt power levels. Both parts meet RoHS compliance requirements, with the HS25 120R F carrying RoHS3 certification. Selection between these parts depends solely on the actual power dissipation requirement of the application. The HS25 120R F offers a smaller physical footprint (27.30mm x 14.20mm versus 49.10mm x 28.00mm), which may provide layout advantages in space-constrained designs operating within its 25W thermal envelope.

Frequently Asked Questions (FAQ)

Q: Can the HS25 120R F replace the HS50 120R F in all applications?

A: No. The HS25 120R F is suitable only for applications where the actual power dissipation does not exceed 25 watts. If the circuit requires 50-watt capability, the HS50 120R F must be used.

Q: Are the resistance and tolerance values identical between these parts?

A: Yes. Both parts provide 120 ohms at ±1% tolerance, ensuring equivalent electrical performance in terms of resistance accuracy.

Q: What is the physical size difference between these parts?

A: The HS50 120R F measures 49.10mm x 28.00mm, while the HS25 120R F measures 27.30mm x 14.20mm. Both maintain the same seated height of 14.80mm. The smaller substitute part may offer layout benefits in space-constrained applications.

Q: Do both parts have the same mounting configuration?

A: Yes. Both parts feature aluminum housing with flanged mounting and solder lug leads, ensuring identical mechanical installation methods.

Q: What compliance certifications apply to each part?

A: The HS50 120R F is RoHS Compliant. The HS25 120R F is RoHS3 Compliant, which represents a more current compliance standard.