KAL50FB50R0 Equivalent & Substitute Parts

Part Overview

The KAL50FB50R0 is a 50 Ohm ±1% 50W wirewound chassis mount resistor manufactured by Stackpole Electronics Inc. This component is designed for high-power applications requiring precision resistance with thermal stability across extended operating ranges. The part is currently in active production status with 771 units in stock. Equivalent substitute parts are necessary to ensure supply chain continuity, accommodate design flexibility across manufacturing partners, and maintain availability during component shortages or lead time constraints.

Substiute Parts

KAL50FB50R0

Stackpole Electronics IncIn Stock: 822KAL50FB50R0 Datasheet

Current PartRFQ

850F50RE

OhmiteIn Stock: 860850F50RE Datasheet

DirectRFQ

TMC05050R00FE02

Vishay DaleIn Stock: 1118TMC05050R00FE02 Datasheet

DirectRFQ

UAL50-50RF8

RiedonIn Stock: 1335UAL50-50RF8 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the KAL50FB50R0 is determined by strict equivalence across the following critical parameters:

• Resistance value: 50 Ohms
• Tolerance: ±1%
• Power rating: 50W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C
• Housing type: Aluminum with flanges
• Lead style: Solder lugs
• Package configuration: Axial, Box
• RoHS compliance: ROHS3 Compliant

All substitute parts listed meet these core electrical and mechanical specifications. Dimensional variations within manufacturing tolerances and differences in optional features do not affect functional equivalence for standard circuit applications.

Parameter Comparison

Engineering Selection Recommendations

All four parts maintain active production status and ROHS3 compliance, qualifying them for equivalent use in applications requiring 50 Ohm ±1% 50W wirewound chassis mount resistors.

The TMC05050R00FE02 (Vishay Dale) operates to a maximum temperature of 250°C, compared to 275°C for the primary part and other substitutes. This difference is relevant only for applications requiring sustained operation above 250°C.

The UAL50-50RF8 (Riedon) includes additional features (current sense, flame proof, pulse withstanding, safety) and carries an MSL rating of 1 (Unlimited), providing enhanced environmental protection for moisture-sensitive applications.

Dimensional variations across all parts remain within acceptable tolerances for standard chassis mount installations. The KAL50FB50R0, 850F50RE, and UAL50-50RF8 share identical length and width specifications (approximately 50mm × 29mm), while the TMC05050R00FE02 matches the primary part exactly at 49.99mm × 28.96mm.

Frequently Asked Questions (FAQ)

Q: Can these parts be used interchangeably in all applications?

A: Yes, for standard circuit applications. All parts meet the core electrical specifications: 50 Ohms ±1%, 50W power rating, ±20ppm/°C temperature coefficient, and -55°C to 275°C operating range (except TMC05050R00FE02, which operates to 250°C). Mechanical compatibility is confirmed through identical flanged mounting features and solder lug lead styles.

Q: What is the significance of the operating temperature difference in the TMC05050R00FE02?

A: The TMC05050R00FE02 has a maximum operating temperature of 250°C versus 275°C for other parts. This part is suitable for applications operating at or below 250°C. Applications requiring sustained operation above 250°C should use the KAL50FB50R0, 850F50RE, or UAL50-50RF8.

Q: Are there dimensional differences that affect PCB layout or mechanical design?

A: Dimensional variations are minimal. The KAL50FB50R0, 850F50RE, and UAL50-50RF8 have nearly identical footprints (approximately 50mm length × 29mm width). The TMC05050R00FE02 matches the primary part exactly. Height differences range from 15.75mm to 16.28mm, which is negligible for standard chassis mount applications.

Q: What does the MSL rating on the UAL50-50RF8 indicate?

A: The UAL50-50RF8 carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity limitations. This is advantageous for storage in humid environments or applications with extended shelf life requirements. Other parts are not moisture-sensitive (MSL Not Applicable).

Q: Are all parts RoHS compliant?

A: Yes, all four parts are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and use.