HS50 5R J Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The HS50 5R J is a 5 Ohm, ±5% tolerance, 50W wirewound chassis mount resistor manufactured by Ohmite in the ARCOL HS series. This component is an active product with ROHS3 compliance and is designed for applications requiring reliable power dissipation in aluminum-housed configurations with flanged mounting. Substitute parts are identified to address inventory availability, tolerance requirements, or power rating adjustments while maintaining core electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Resistance	5 Ohms
Tolerance	±5%
Power Rating	50W
Composition	Wirewound
Temperature Coefficient	±100ppm/°C
Housing Type	Aluminum
Mounting Feature	Flanges
Lead Style	Solder Lugs
Package Type	Axial, Box
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the HS50 5R J is determined by the following core parameters: resistance value (5 Ohms), composition (wirewound), housing type (aluminum with flanges), lead style (solder lugs), and package configuration (axial, box). Substitute parts are grouped into two categories:

Category 1: Same Power Rating (50W) with Tolerance Variation

HS50 5R F (ARCOL): Identical 50W power rating with improved ±1% tolerance and pulse withstanding capability
HS50 5R J (ARCOL): Identical specifications with alternative manufacturer source

Category 2: Reduced Power Rating (25W) with Tolerance Variation

HS25 5R J (Ohmite): 25W power rating, ±5% tolerance, same manufacturer as main part
HS25 5R F (ARCOL): 25W power rating, ±1% tolerance, pulse withstanding capability

All substitute parts maintain identical resistance value, temperature coefficient, aluminum housing, flanged mounting, and solder lug lead configuration. Substitution is valid only when circuit design permits the specified power rating and tolerance.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temperature Coefficient	Housing	Mounting	Length (mm)	Width (mm)	Height (mm)	RoHS Status
HS50 5R J	Ohmite	5 Ohms	±5%	50	±100ppm/°C	Aluminum	Flanges	49.10	14.20	14.80	ROHS3
HS50 5R F	ARCOL	5 Ohms	±1%	50	±100ppm/°C	Aluminum	Flanges	49.10	28.00	14.80	RoHS
HS50 5R J	ARCOL	5 Ohms	±5%	50	±100ppm/°C	Aluminum	Flanges	49.10	28.00	14.80	RoHS
HS25 5R J	Ohmite	5 Ohms	±5%	25	±100ppm/°C	Aluminum	Flanges	27.30	14.20	14.80	ROHS3
HS25 5R F	ARCOL	5 Ohms	±1%	25	±100ppm/°C	Aluminum	Flanges	27.30	28.00	14.80	RoHS

Engineering Selection Recommendations

Direct Substitution (Same Power Rating): The HS50 5R F (ARCOL) provides direct substitution with improved tolerance specification (±1% versus ±5%) and pulse withstanding capability. Both 50W variants maintain identical physical mounting dimensions and electrical performance envelope. The ARCOL HS50 5R J offers equivalent specifications with alternative manufacturer sourcing.

Conditional Substitution (Reduced Power Rating): The HS25 5R J and HS25 5R F are valid substitutes only when circuit design permits 25W power dissipation. These parts maintain identical resistance, temperature coefficient, and mounting configuration but occupy reduced physical envelope (27.30mm length versus 49.10mm). Selection between ±5% and ±1% tolerance variants depends on circuit tolerance requirements.

Compliance Considerations: All substitute parts maintain active product status. The Ohmite variants (HS50 5R J, HS25 5R J) carry ROHS3 compliance. The ARCOL variants (HS50 5R F, HS25 5R F, HS50 5R J) carry RoHS compliance with MSL rating of 1 (Unlimited). REACH status differs between manufacturers; verify compliance requirements for specific applications.

Frequently Asked Questions (FAQ)

Q: Can HS25 5R J replace HS50 5R J in any application? A: Only if the circuit design permits 25W power dissipation. The HS25 series is rated for half the power output. Verify thermal and electrical load requirements before substitution.

Q: What is the difference between ±5% and ±1% tolerance variants? A: Tolerance specifies the maximum deviation from the nominal 5 Ohm resistance value. ±5% allows ±0.25 Ohm deviation; ±1% allows ±0.05 Ohm deviation. Select based on circuit precision requirements.

Q: Are physical dimensions interchangeable between 50W and 25W variants? A: The 50W variants are 49.10mm in length; 25W variants are 27.30mm in length. Width dimensions also differ (14.20mm versus 28.00mm for some variants). Verify PCB layout and mounting space before substitution.

Q: What does "pulse withstanding" mean? A: This feature indicates the resistor can withstand transient overvoltage conditions. It is present in ARCOL HS50 5R F and HS25 5R F variants but not specified for Ohmite variants.

Q: Can I substitute ARCOL parts for Ohmite parts? A: Yes, provided electrical specifications (resistance, tolerance, power rating) and mechanical parameters (housing, mounting, lead style) match circuit requirements. Both manufacturers produce equivalent ARCOL HS series components.

Q: What is the difference between ROHS3 and RoHS compliance? A: Both indicate compliance with Restriction of Hazardous Substances regulations. ROHS3 refers to the third iteration of the directive. Verify specific compliance requirements for your application region.

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