UAL25-250RF8 Equivalent & Substitute Parts

Part Overview

The UAL25-250RF8 is a 250 Ohms ±1% 25W wirewound chassis mount resistor manufactured by Riedon. This component is designed for applications requiring precision current sensing with high power dissipation capability in a compact flanged aluminum housing. The part maintains Active product status with full RoHS3 compliance and REACH unaffected certification. Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and compliance certifications align within acceptable tolerances for direct circuit board replacement.

Substiute Parts

UAL25-250RF8

RiedonIn Stock: 749UAL25-250RF8 Datasheet

Current PartRFQ

KAL25FB250R

Stackpole Electronics IncIn Stock: 1206KAL25FB250R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The KAL25FB250R from Stackpole Electronics Inc qualifies as a direct substitute for the UAL25-250RF8 based on the following critical parameters:

• Identical resistance value: 250 Ohms
• Matching tolerance: ±1%
• Equivalent power rating: 25W
• Same composition: Wirewound
• Identical temperature coefficient: ±20ppm/°C
• Matching operating temperature range: -55°C to 275°C
• Same housing material: Aluminum
• Identical mounting configuration: Flanges with solder lugs
• Equivalent mechanical dimensions within manufacturing tolerances
• Matching compliance certifications: RoHS3 Compliant and REACH Unaffected

Parameter Comparison

Engineering Selection Recommendations

Both the UAL25-250RF8 and KAL25FB250R maintain Active product status with equivalent compliance certifications. The KAL25FB250R is suitable for direct substitution in applications where the UAL25-250RF8 is specified, provided that circuit board layout accommodates the minimal dimensional variations documented in the parameter comparison table. Mechanical dimensions differ by less than 0.001" in length and width, and 0.002" in maximum seated height, which fall within standard PCB tolerance stackups for flanged chassis mount resistors. Both parts carry RoHS3 Compliant and REACH Unaffected certifications, ensuring regulatory compliance in equivalent applications.

Frequently Asked Questions (FAQ)

Q: Can the KAL25FB250R replace the UAL25-250RF8 in existing designs?

A: Yes. The KAL25FB250R meets all critical electrical and mechanical specifications. Dimensional variations are within standard manufacturing tolerances for this component class and do not affect circuit functionality or thermal performance.

Q: Are there differences in temperature performance between these parts?

A: No. Both parts operate across the identical temperature range of -55°C to 275°C with matching temperature coefficients of ±20ppm/°C.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the UAL25-250RF8 and KAL25FB250R are RoHS3 Compliant and REACH Unaffected, meeting equivalent regulatory requirements.

Q: What is the significance of the ±1% tolerance specification?

A: The ±1% tolerance ensures precision current sensing applications. Both parts maintain this tolerance specification, making them functionally equivalent for circuits requiring this accuracy level.

Q: Are the solder lug connections identical?

A: Yes. Both parts use solder lugs as the lead style and are packaged in Axial, Box configuration, ensuring compatible PCB assembly processes.