Equivalent & Substitute Parts for 825F3K0

Part Overview

The Ohmite 825F3K0 is a 3 kOhms ±1% 25W wirewound chassis mount resistor designed for high-power applications requiring precision resistance and thermal stability. This component features an aluminum housing with flanged mounting and solder lug termination, suitable for applications operating across -55°C to 275°C. The 825F3K0 is classified as obsolete, necessitating identification of active equivalent components that maintain electrical and mechanical compatibility for ongoing system support and new production requirements.

Substiute Parts

825F3K0

OhmiteIn Stock: 779825F3K0 Datasheet

Current PartRFQ

KAL25FB3K00

Stackpole Electronics IncIn Stock: 1153KAL25FB3K00 Datasheet

DirectRFQ

RH0253K000FC02

Vishay DaleIn Stock: 962RH0253K000FC02 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 825F3K0 is determined by strict equivalence across the following electrical and mechanical parameters:

• Resistance value of 3 kOhms with ±1% tolerance
• 25W power rating
• Wirewound composition
• Temperature coefficient of ±20ppm/°C
• Aluminum housing with flanged mounting
• Solder lug termination
• Axial, box package configuration

The identified substitute parts—KAL25FB3K00 (Stackpole Electronics Inc) and RH0253K000FC02 (Vishay Dale)—satisfy all core electrical specifications and mechanical form factors. Both components maintain the required resistance, tolerance, power rating, and thermal characteristics. Dimensional variations within the specified parameters do not preclude functional equivalence in standard chassis mount applications.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts maintain full electrical and mechanical compatibility with the 825F3K0 across all specified parameters. Selection between KAL25FB3K00 and RH0253K000FC02 depends on regulatory and compliance requirements:

KAL25FB3K00 (Stackpole Electronics Inc): This component is classified as active with ROHS3 compliance and REACH unaffected status. It is the preferred selection for applications requiring modern regulatory compliance and long-term supply continuity.

RH0253K000FC02 (Vishay Dale): This component is classified as active but carries RoHS non-compliant status and REACH affected designation. It is suitable for legacy system maintenance where regulatory compliance is not a constraint. The operating temperature maximum is 250°C, compared to 275°C for the original 825F3K0 and KAL25FB3K00.

Frequently Asked Questions (FAQ)

Q: Can KAL25FB3K00 and RH0253K000FC02 be used interchangeably with the 825F3K0?

A: Both parts satisfy the core electrical specifications (3 kOhms, ±1%, 25W, ±20ppm/°C) and mechanical form factors (aluminum housing, flanged mounting, solder lugs). They are functionally equivalent for standard chassis mount applications. Selection should account for regulatory compliance requirements and operating temperature limits.

Q: What is the significance of the operating temperature difference between RH0253K000FC02 and the other parts?

A: The RH0253K000FC02 has a maximum operating temperature of 250°C, while the 825F3K0 and KAL25FB3K00 support 275°C. Applications requiring operation above 250°C must use the KAL25FB3K00 or original 825F3K0.

Q: Are there dimensional differences between the substitute parts?

A: Minor dimensional variations exist within the specified package type. The 825F3K0 measures 1.062" L x 1.094" W with 0.556" seated height. Both substitutes measure 1.062" L x 1.080" W, with KAL25FB3K00 at 0.577" and RH0253K000FC02 at 0.561" seated height. These variations remain within standard chassis mount tolerances and do not affect mechanical compatibility.

Q: What is the difference between ROHS3 compliance and RoHS non-compliant status?

A: ROHS3 compliance indicates the component meets the Restriction of Hazardous Substances Directive 3 requirements, restricting specific hazardous materials. RoHS non-compliant components may contain restricted substances. For new designs and regulated applications, ROHS3 compliant parts are required.

Q: How does REACH affected status impact component selection?

A: REACH affected status indicates the component or its materials are subject to European chemical regulations. REACH unaffected components have no such regulatory constraints. For applications with strict regulatory requirements, REACH unaffected parts are preferred.