HS50 68R F Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The HS50 68R F is an active Ohmite ARCOL series wirewound chassis mount resistor rated for 50W power dissipation at 68 Ohms with ±1% tolerance. This component is designed for high-power applications requiring stable resistance values and thermal management through aluminum housing with flanged mounting. Substitute parts are identified when equivalent electrical specifications can be maintained within the allowed parameter ranges for this resistor category, particularly when power rating flexibility or dimensional constraints necessitate alternative models from the same manufacturer series.

Substiute Parts

HS50 68R F

OhmiteIn Stock: 861HS50 68R F Datasheet

Current PartRFQ

HS25 68R F

OhmiteIn Stock: 1259HS25 68R F Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The HS25 68R F qualifies as a parametric equivalent based on the following matching criteria:

• Identical resistance value: 68 Ohms
• Identical tolerance: ±1%
• Identical composition: Wirewound
• Identical temperature coefficient: ±100ppm/°C
• Identical housing material: Aluminum
• Identical mounting feature: Flanges
• Identical lead style: Solder Lugs
• Identical RoHS compliance: ROHS3 Compliant
• Identical series designation: ARCOL, HS

The primary difference is the power rating: HS25 68R F is rated for 25W versus the 50W rating of the HS50 68R F. This substitution is valid when circuit requirements permit operation at the lower 25W power level, or when thermal management and space constraints favor the smaller physical dimensions of the 25W variant.

Parameter Comparison

Engineering Selection Recommendations

Both the HS50 68R F and HS25 68R F maintain active product status with full ROHS3 compliance and REACH unaffected designation, ensuring regulatory compliance for current applications. Selection between these parts depends on circuit power dissipation requirements. The HS50 68R F is specified when the application requires the full 50W power handling capability. The HS25 68R F substitute is applicable when actual power dissipation in the circuit does not exceed 25W, offering a more compact form factor with reduced axial length while maintaining identical electrical performance and mechanical mounting compatibility through flanged aluminum construction.

Frequently Asked Questions (FAQ)

Q: Can the HS25 68R F replace the HS50 68R F in all applications?

A: The HS25 68R F is a valid substitute only when the circuit power dissipation does not exceed 25W. If the application requires sustained operation above 25W, the HS50 68R F must be used to prevent thermal damage and ensure component reliability.

Q: Are the mounting dimensions compatible between these parts?

A: The width and height dimensions are identical (0.559" × 0.583"), and both use flanged mounting. The axial length differs: HS50 68R F is 1.933" while HS25 68R F is 1.075". Verify that the reduced length of the HS25 68R F does not conflict with circuit board layout or thermal management requirements.

Q: Do these parts have identical electrical characteristics?

A: Yes. Both parts share identical resistance (68 Ohms), tolerance (±1%), temperature coefficient (±100ppm/°C), and wirewound composition. Electrical performance is equivalent within the specified power ratings.

Q: What is the significance of the ±100ppm/°C temperature coefficient?

A: This specification indicates the resistor's resistance change per degree Celsius of temperature variation. Both parts maintain this identical coefficient, ensuring predictable performance across the operating temperature range in applications requiring stable resistance values.

Q: Are there any compliance differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical regulatory designations (ECCN: EAR99, HTSUS: 8533.29.0000).