43F4K0 Equivalent & Substitute Parts Reference

Part Overview

The Ohmite 43F4K0 is a 4 kOhms ±1% 3W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production and maintains 1108 pieces in new original stock. The part operates across a wide temperature range from -55°C to 275°C, making it suitable for demanding industrial and high-temperature applications. Substitute parts are identified to provide alternative sourcing options when the primary part becomes unavailable or when inventory constraints require component flexibility.

Substiute Parts

43F4K0

OhmiteIn Stock: 117243F4K0 Datasheet

Current PartRFQ

ALSR034K000FE12

Vishay DaleIn Stock: 1311ALSR034K000FE12 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 43F4K0 are qualified based on the following critical parameters that determine functional equivalence:

• Resistance Value: Must be 4 kOhms
• Tolerance: Must be ±1%
• Power Rating: Must be 3W
• Composition: Must be Wirewound
• Package Type: Must be Axial with 2 terminations
• Moisture Sensitivity Level: Must be 1 (Unlimited)

The Vishay Dale ALSR034K000FE12 meets all mandatory substitution criteria. While secondary parameters such as temperature coefficient and operating temperature range differ, these variations remain within acceptable engineering margins for general-purpose resistor applications and do not preclude functional substitution in most circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Both the 43F4K0 and ALSR034K000FE12 are active production components with established supply chains. The Vishay Dale ALSR034K000FE12 offers ROHS3 compliance, which may be required for applications subject to environmental regulations. The 43F4K0 provides a higher maximum operating temperature of 275°C compared to the substitute's 250°C limit, making it preferable for extreme high-temperature applications. The 43F4K0 also features a lower temperature coefficient of ±20ppm/°C versus ±30ppm/°C for the substitute, providing superior stability in precision circuits. Physical dimensions differ, with the 43F4K0 being larger; PCB layout and thermal management considerations should account for this variation. Selection should be based on specific application requirements regarding temperature range, regulatory compliance, and available board space.

Frequently Asked Questions (FAQ)

Q: Can the ALSR034K000FE12 be used as a direct replacement for the 43F4K0 in all applications?

A: The ALSR034K000FE12 qualifies as a functional substitute based on matching resistance, tolerance, power rating, composition, and package type. However, applications requiring operation above 250°C or demanding the lower temperature coefficient of ±20ppm/°C should retain the 43F4K0.

Q: What is the significance of the physical dimension difference between these parts?

A: The 43F4K0 measures 0.220" diameter by 0.594" length, while the ALSR034K000FE12 measures 0.180" diameter by 0.500" length. The substitute is physically smaller and may fit more easily in space-constrained layouts. Verify PCB footprint compatibility and thermal dissipation requirements before substitution.

Q: Does the RoHS compliance difference affect substitution eligibility?

A: The ALSR034K000FE12 is ROHS3 compliant while the 43F4K0 is RoHS non-compliant. For applications or markets requiring RoHS compliance, the substitute is the appropriate choice. For legacy systems without compliance requirements, either part is acceptable.

Q: Are there any circuit performance differences due to the temperature coefficient variation?

A: The 43F4K0 has a temperature coefficient of ±20ppm/°C compared to ±30ppm/°C for the ALSR034K000FE12. In precision analog circuits operating across wide temperature ranges, the 43F4K0 provides superior resistance stability. For general-purpose applications, this difference is typically negligible.

Q: What packaging considerations should be evaluated?

A: The 43F4K0 is supplied in box packaging while the ALSR034K000FE12 is supplied in bulk packaging. Verify that bulk packaging meets your procurement and handling requirements. Both parts maintain unlimited moisture sensitivity level (MSL 1), eliminating moisture-related storage constraints.