HS25 3R F Wirewound Chassis Mount Resistor - Equivalent & Substitute Parts

Part Overview

The HS25 3R F is a 25-watt wirewound chassis mount resistor manufactured by Ohmite, rated at 3 ohms with ±1% tolerance. This component is designed for high-power applications requiring stable resistance performance in industrial and electronic equipment. The part is currently active in production with 1,052 units in stock. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the allowed parameter range for this resistor category.

Substiute Parts

HS25 3R F

OhmiteIn Stock: 1098HS25 3R F Datasheet

Current PartRFQ

825F3R0E

OhmiteIn Stock: 856825F3R0E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 825F3R0E qualifies as a direct substitute for the HS25 3R F based on the following critical parameters:

• Resistance Value: Both parts are rated at 3 ohms
• Tolerance: Both maintain ±1% tolerance
• Power Rating: Both are rated for 25W operation
• Composition: Both are wirewound construction
• Mounting Configuration: Both feature flange-mounted design with solder lugs
• Housing Material: Both use aluminum construction
• Package Format: Both are supplied in axial, box configuration
• Regulatory Compliance: Both are RoHS compliant

The 825F3R0E is manufactured by Ohmite under the Metal-Mite®89 series and represents an equivalent alternative with compatible electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the HS25 3R F and 825F3R0E are active production components from Ohmite with full RoHS compliance. The 825F3R0E offers a defined operating temperature range (-55°C ~ 275°C) and a tighter temperature coefficient specification (±50ppm/°C versus 100ppm/°C), making it suitable for applications requiring enhanced thermal stability. Dimensional variations are minor and within typical mechanical tolerances for chassis-mount resistor applications. Selection between these parts should be based on application-specific thermal requirements and available inventory.

Frequently Asked Questions (FAQ)

Q: Can the 825F3R0E replace the HS25 3R F in existing designs?

A: Yes. Both parts share identical electrical specifications (3 ohms, ±1%, 25W) and mechanical mounting characteristics (flange-mounted, solder lugs, aluminum housing). Dimensional differences are minimal and do not affect standard PCB or chassis mounting patterns.

Q: What is the difference in temperature coefficient between these parts?

A: The HS25 3R F specifies 100ppm/°C, while the 825F3R0E specifies ±50ppm/°C. The 825F3R0E provides tighter temperature stability, beneficial for precision applications or environments with significant thermal variation.

Q: Are there packaging differences between these parts?

A: The HS25 3R F is supplied in box packaging, while the 825F3R0E is supplied in tray packaging. Both use identical axial, box case format. Tray packaging typically offers advantages for automated assembly processes.

Q: Do both parts meet current RoHS requirements?

A: Yes. The HS25 3R F is RoHS Compliant, and the 825F3R0E is ROHS3 Compliant, confirming both meet current environmental and hazardous substance restrictions.

Q: What are the dimensional tolerances for mechanical fit?

A: The HS25 3R F measures 1.075" L x 1.102" W with 0.583" seated height. The 825F3R0E measures 1.062" L x 1.094" W with 0.556" seated height. These minor variations (approximately 1-2%) are within standard mechanical tolerances for chassis-mount resistor applications and do not require design modification.