Equivalent & Substitute Parts for Ohmite 805F3K0

Part Overview

The Ohmite 805F3K0 is a 3 kOhms ±1% 5W wirewound chassis mount resistor from the Metal-Mite®89 series. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system maintenance and new design implementations. The part features aluminum housing with flanged mounting and solder lug termination, designed for applications requiring precision resistance with moderate power dissipation in the 5W range.

Substiute Parts

805F3K0

OhmiteIn Stock: 985805F3K0 Datasheet

Current PartRFQ

KAL25FB3K00

Stackpole Electronics IncIn Stock: 1153KAL25FB3K00 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the Ohmite 805F3K0 is based on maintaining electrical and mechanical compatibility across the following critical parameters:

• Resistance Value: 3 kOhms (exact match required)
• Tolerance: ±1% (precision specification must be maintained)
• Composition: Wirewound (thermal and frequency characteristics)
• Temperature Coefficient: ±20ppm/°C (stability requirement)
• Operating Temperature Range: -55°C to 275°C (environmental specification)
• Mounting Feature: Flanges (mechanical interface requirement)
• Lead Style: Solder Lugs (termination compatibility)
• Housing Type: Aluminum (thermal management and mechanical structure)

The Stackpole Electronics Inc KAL25FB3K00 qualifies as a substitute part. While it provides a higher power rating (25W versus 5W), this represents an upgrade that maintains all critical electrical parameters and mechanical interfaces. The increased power capacity does not compromise functionality in applications designed for the 5W specification.

Parameter Comparison

Engineering Selection Recommendations

The Stackpole Electronics Inc KAL25FB3K00 is the qualified substitute for the obsolete Ohmite 805F3K0. Selection is based on the following engineering criteria:

Electrical Compatibility: Both components maintain identical resistance value (3 kOhms), tolerance (±1%), temperature coefficient (±20ppm/°C), and operating temperature range (-55°C to 275°C). These parameters ensure functional equivalence in circuit operation.

Mechanical Compatibility: Both components feature aluminum housing with flanged mounting and solder lug termination. The physical interface remains compatible with existing mounting structures and circuit board layouts.

Product Status and Availability: The Ohmite 805F3K0 is obsolete with no active manufacturing. The Stackpole KAL25FB3K00 is active production, ensuring long-term availability and supply chain continuity.

Regulatory Compliance: The Stackpole substitute achieves ROHS3 compliance, whereas the original Ohmite part is RoHS non-compliant. This upgrade supports compliance requirements for new designs and regulated applications.

Power Rating Consideration: The Stackpole part provides 25W capacity compared to the original 5W specification. This represents a performance upgrade that does not introduce compatibility issues in applications designed for the lower power rating.

Frequently Asked Questions (FAQ)

Q: Can the Stackpole KAL25FB3K00 be used as a direct replacement for the Ohmite 805F3K0?

A: Yes. Both components share identical electrical specifications (3 kOhms, ±1% tolerance, ±20ppm/°C temperature coefficient, -55°C to 275°C operating range) and mechanical interfaces (flanged aluminum housing with solder lug termination). The higher power rating of the Stackpole part does not create compatibility issues.

Q: What are the physical dimension differences between these parts?

A: The Ohmite 805F3K0 measures 0.600" L x 0.646" W with 0.330" seated height. The Stackpole KAL25FB3K00 measures 1.062" L x 1.080" W with 0.577" seated height. Physical space availability must be verified during integration.

Q: Does the higher power rating of the Stackpole part affect circuit performance?

A: No. Power rating represents maximum dissipation capacity. The Stackpole part will operate identically to the original in circuits designed for 5W dissipation. The upgrade provides additional thermal margin without changing electrical behavior.

Q: Are there packaging differences between these components?

A: Both components use Axial, Box package type with solder lug termination. The Ohmite part is supplied in standard packaging, while the Stackpole part is supplied in bulk packaging.

Q: What is the significance of the RoHS compliance difference?

A: The Ohmite 805F3K0 is RoHS non-compliant, while the Stackpole KAL25FB3K00 is ROHS3 compliant. For applications subject to RoHS regulations or customer requirements, the Stackpole substitute provides regulatory alignment.