HS25 40R F Equivalent & Substitute Parts

Part Overview

The HS25 40R F is a 40 Ohms ±1% 25W wirewound chassis mount resistor manufactured by Ohmite in the ARCOL, HS series. This component is designed for applications requiring precision power dissipation with stable resistance values across operating conditions. The part is currently Active in product status with 1119 pieces available in inventory. Equivalent and substitute parts are identified when design requirements permit tolerance of dimensional or thermal performance variations while maintaining core electrical specifications.

Substiute Parts

HS25 40R F

OhmiteIn Stock: 1200HS25 40R F Datasheet

Current PartRFQ

825F40RE

OhmiteIn Stock: 1317825F40RE Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The 825F40RE qualifies as a direct substitute for the HS25 40R F based on matching core electrical parameters: 40 Ohms resistance, ±1% tolerance, and 25W power rating. Both components utilize wirewound construction with aluminum housing and flange-mounted solder lugs. Substitution is valid when the following conditions are met:

• Resistance value and tolerance remain identical (40 Ohms ±1%)
• Power dissipation requirement does not exceed 25W
• Mounting interface accommodates flange-style solder lugs
• Operating environment is compatible with the substitute's thermal and environmental specifications
• PCB layout can accommodate dimensional variations between the two parts

Parameter Comparison

Engineering Selection Recommendations

Both the HS25 40R F and 825F40RE are Active products manufactured by Ohmite with ROHS3 compliance. Selection between these parts depends on application-specific requirements:

The 825F40RE offers superior temperature stability with a temperature coefficient of ±20ppm/°C compared to the HS25 40R F at ±100ppm/°C, making it suitable for precision applications with wider operating temperature ranges (-55°C to 275°C). The 825F40RE is from the Metal-Mite®89 series and provides defined operating temperature specifications.

The HS25 40R F remains the primary choice when the original part specification is required or when dimensional constraints favor its smaller width profile (0.559" versus 1.094").

Dimensional differences exist in width and length; verify PCB layout compatibility before substitution. Both parts maintain identical electrical performance at 40 Ohms ±1% and 25W power rating.

Frequently Asked Questions (FAQ)

Q: Can the 825F40RE replace the HS25 40R F in all applications?

A: The 825F40RE is electrically equivalent with identical resistance, tolerance, and power rating. However, dimensional differences in width (0.559" versus 1.094") and length (1.075" versus 1.062") require verification of PCB layout compatibility. Both parts use flange-mounted solder lugs and aluminum housing.

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

A: The HS25 40R F has a temperature coefficient of ±100ppm/°C, while the 825F40RE has ±20ppm/°C. The 825F40RE provides superior stability across temperature variations, beneficial for precision circuits. The 825F40RE also specifies an operating range of -55°C to 275°C.

Q: Are both parts RoHS compliant?

A: Yes, both the HS25 40R F and 825F40RE are ROHS3 compliant.

Q: What mounting considerations apply to substitution?

A: Both parts feature flange-mounted solder lugs and aluminum housing. Verify that the PCB mounting holes and mechanical interface accommodate the dimensional variations, particularly the width difference of approximately 0.535 inches.

Q: Which part should be selected for new designs?

A: For new designs, the 825F40RE from the Metal-Mite®89 series is recommended due to its defined operating temperature range, superior temperature coefficient, and Active product status. For legacy system maintenance, the HS25 40R F maintains original specifications.