Ohmite 45F8K2 Equivalent & Substitute Parts

Part Overview

The Ohmite 45F8K2 is an 8.2 kOhms ±1% 5W through-hole resistor with axial wirewound construction from the Ohmicone® 40 series. This component is designed for applications requiring precision resistance values with moderate power dissipation in compact axial packaging. The part maintains active product status with 1142 units in current inventory. Substitute parts are identified to address supply chain continuity, inventory availability, or specific application requirements where equivalent electrical and mechanical parameters are maintained.

Substiute Parts

45F8K2

OhmiteIn Stock: 117445F8K2 Datasheet

Current PartRFQ

ALSR058K200FE12

Vishay DaleIn Stock: 1268ALSR058K200FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Ohmite 45F8K2 are qualified based on the following critical parameters:

• Resistance Value: 8.2 kOhms (exact match required)
• Tolerance: ±1% (maintains precision specification)
• Power Rating: 5W (equivalent thermal capability)
• Composition: Wirewound (same construction technology)
• Package: Axial (identical form factor and termination style)
• Termination Count: 2 (standard through-hole configuration)

The Vishay Dale ALSR058K200FE12 qualifies as a direct substitute by meeting all core electrical parameters and maintaining axial package compatibility. Physical dimensions remain within acceptable tolerance for standard PCB layouts and mounting hardware.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (Ohmite 45F8K2): Use when RoHS non-compliant components are acceptable for the application and the Ohmicone® 40 series is specified in design documentation.

Substitute Selection (Vishay Dale ALSR058K200FE12): Use when ROHS3 compliance is required, moisture-resistant construction is beneficial, or when the Ohmite part is unavailable. The slightly higher temperature coefficient (±30ppm/°C vs ±20ppm/°C) remains within acceptable limits for most general-purpose applications. Physical dimensions are marginally smaller, which may provide layout advantages in space-constrained designs.

Both parts maintain identical electrical performance for resistance value, tolerance, and power dissipation. The axial package format ensures direct mechanical compatibility with standard through-hole PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the Vishay Dale ALSR058K200FE12 be used as a direct replacement for the Ohmite 45F8K2?

A: Yes. Both components share identical resistance (8.2 kOhms), tolerance (±1%), power rating (5W), and axial package configuration. The substitute meets all core electrical and mechanical requirements for equivalent circuit performance.

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

A: The Ohmite 45F8K2 has a temperature coefficient of ±20ppm/°C, while the Vishay Dale ALSR058K200FE12 is ±30ppm/°C. This 10ppm/°C difference is negligible for most applications and does not affect substitutability for general-purpose resistive circuits.

Q: Are there physical dimension differences that affect PCB layout?

A: The Vishay Dale substitute is slightly smaller (0.312" Dia x 0.875" L vs 0.343" Dia x 0.937" L). This dimensional reduction provides layout flexibility and does not create compatibility issues with standard axial component footprints.

Q: What is the RoHS compliance difference?

A: The Ohmite 45F8K2 is RoHS non-compliant, while the Vishay Dale ALSR058K200FE12 is ROHS3 compliant. Select the Vishay Dale part for applications requiring RoHS certification or regulatory compliance.

Q: Does the moisture-resistant feature of the Vishay Dale part affect performance?

A: The moisture-resistant construction of the ALSR058K200FE12 provides enhanced environmental protection without altering electrical characteristics. This feature is beneficial in humid or corrosive environments but does not impact substitutability in standard applications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. Both components are axial wirewound resistors with identical electrical specifications and package type. No circuit modifications or PCB redesign is required for substitution.