Ohmite HS50 33R J Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The Ohmite HS50 33R J is an active, production wirewound chassis mount resistor rated at 33 Ohms ±5% with 50W power dissipation capability. This component is designed for applications requiring reliable thermal management through aluminum housing and flanged mounting. Equivalent and substitute parts are identified when circuit design requirements permit tolerance relaxation, power rating reduction, or manufacturer sourcing flexibility while maintaining core electrical and mechanical compatibility.

Substiute Parts

HS50 33R J

OhmiteIn Stock: 1121HS50 33R J Datasheet

Current PartRFQ

HS25 33R J

OhmiteIn Stock: 1336HS25 33R J Datasheet

Parametric EquivalentRFQ

HS50 33R F

OhmiteIn Stock: 868HS50 33R F Datasheet

Parametric EquivalentRFQ

HS50 33R J

ARCOLIn Stock: 1147HS50 33R J Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HS50 33R J is determined by the following criteria:

Core Electrical Parameters (Non-Negotiable):

• Resistance value: 33 Ohms
• Composition: Wirewound
• Temperature Coefficient: ±100ppm/°C
• Housing Type: Aluminum
• Mounting Feature: Flanges
• Lead Style: Solder Lugs

Allowable Variation Parameters:

• Tolerance: ±5% (primary specification); ±1% acceptable for higher precision applications
• Power Rating: 50W (primary); 25W acceptable only in applications with reduced thermal load requirements
• Manufacturer: Ohmite or ARCOL (same product line)

Compliance Requirements:

• RoHS3 Compliant or RoHS Compliant status required
• ECCN: EAR99 classification maintained

Substitute parts must maintain identical resistance, composition, temperature coefficient, housing, and mounting characteristics. Tolerance and power rating variations are permitted only when circuit design specifications explicitly allow such deviations.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent (Preferred Substitution): The HS50 33R J manufactured by ARCOL is a direct equivalent to the Ohmite HS50 33R J. Both parts maintain identical electrical specifications (33 Ohms ±5%, 50W), composition (wirewound), temperature coefficient (±100ppm/°C), and mechanical mounting characteristics. The ARCOL variant includes pulse withstanding capability as an additional feature. Both maintain active product status and RoHS compliance. This substitution introduces no circuit performance risk.

Higher Precision Equivalent: The HS50 33R F (Ohmite) provides the same 50W power rating and mechanical form factor as the primary part but with improved tolerance specification (±1% versus ±5%). This substitution is appropriate for applications requiring tighter resistance accuracy. All other electrical and mechanical parameters remain identical. Active product status and ROHS3 compliance are maintained.

Reduced Power Rating Equivalent: The HS25 33R J (Ohmite) maintains identical resistance (33 Ohms ±5%), composition (wirewound), temperature coefficient (±100ppm/°C), and mounting characteristics but with reduced power dissipation capability (25W versus 50W). This substitution is applicable only in circuits where thermal load analysis confirms that 25W dissipation capacity is sufficient. The component exhibits a reduced physical footprint (1.075" length versus 1.933"). Active product status and ROHS3 compliance are maintained.

Dimensional Consideration: The ARCOL HS50 33R J variant exhibits increased width (1.102" versus 0.559") compared to the Ohmite equivalent. PCB layout verification is required to confirm mechanical fit within the intended mounting space.

Frequently Asked Questions (FAQ)

Q: Can the HS25 33R J be used as a direct replacement for the HS50 33R J? A: The HS25 33R J is electrically equivalent in resistance, tolerance, and temperature coefficient but provides only 25W power dissipation versus 50W. Substitution is valid only when circuit thermal analysis confirms that the application dissipates 25W or less through the resistor. Exceeding this power rating will result in component failure.

Q: What is the difference between the Ohmite and ARCOL versions of the HS50 33R J? A: Both maintain identical electrical specifications (33 Ohms ±5%, 50W) and core mechanical characteristics. The ARCOL variant includes pulse withstanding capability and exhibits a wider physical footprint (1.102" versus 0.559"). PCB layout compatibility must be verified before substitution.

Q: Is the HS50 33R F a suitable replacement when tolerance requirements are critical? A: Yes. The HS50 33R F provides ±1% tolerance compared to the ±5% specification of the HS50 33R J, while maintaining identical 50W power rating, wirewound composition, and mechanical mounting. This substitution is appropriate for precision applications where tighter resistance accuracy is required.

Q: Are all substitute parts RoHS compliant? A: Yes. The Ohmite variants (HS50 33R J, HS25 33R J, HS50 33R F) are ROHS3 Compliant. The ARCOL HS50 33R J is RoHS Compliant. Both compliance levels are acceptable for applications subject to RoHS regulations.

Q: What is the impact of dimensional differences on PCB design? A: The HS25 33R J exhibits reduced length (1.075" versus 1.933"), which may allow for more compact board layouts. The ARCOL HS50 33R J exhibits increased width (1.102" versus 0.559"), which requires verification of available mounting space. Height specifications remain consistent across all variants at 0.583" maximum seated height.

Q: Can these parts be used interchangeably in high-frequency applications? A: All variants maintain identical temperature coefficient (±100ppm/°C) and wirewound composition. Frequency-dependent performance characteristics are not provided in the specification data. Application-specific frequency response analysis is required to determine interchangeability in high-frequency circuits.