Ohmite 40F25K Equivalent & Substitute Parts

Part Overview

The Ohmite 40F25K is a 25 kOhms ±1% 10W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is designed for applications requiring precision resistance with high power dissipation capability. The part is currently active in production with 727 units in stock. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when packaging requirements differ.

Substiute Parts

40F25K

OhmiteIn Stock: 81140F25K Datasheet

Current PartRFQ

40F25KE

OhmiteIn Stock: 106840F25KE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 40F25K is determined by matching the following critical parameters:

• Resistance value: 25 kOhms
• Tolerance: ±1%
• Power rating: 10W
• Composition: Wirewound
• Package type: Axial
• Temperature coefficient: ±20ppm/°C
• Physical dimensions: 0.406" Dia x 1.902" L (10.30mm x 48.30mm)
• Number of terminations: 2

The substitute part 40F25KE meets all electrical and mechanical specifications required for direct substitution. The primary difference is packaging configuration (Bulk versus standard packaging), which does not affect electrical performance or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the 40F25K and 40F25KE are active production parts from Ohmite with identical electrical and mechanical specifications. Selection between these parts should be based on the following criteria:

40F25K is suitable for applications where standard packaging is required and RoHS non-compliant components are acceptable.

40F25KE is the preferred choice for applications requiring ROHS3 compliance. This part offers the same electrical performance and physical compatibility while meeting modern regulatory requirements. The Bulk packaging configuration does not affect electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can 40F25KE be used as a direct replacement for 40F25K?

A: Yes. Both parts are electrically and mechanically identical, with matching resistance, tolerance, power rating, composition, package type, temperature coefficient, and physical dimensions. The 40F25KE differs only in packaging configuration and RoHS compliance status.

Q: What is the difference between standard and Bulk packaging?

A: Packaging configuration affects order quantities and shipping methods but does not impact electrical performance or mechanical compatibility. Both packaging types contain the same component.

Q: Does RoHS compliance affect component performance?

A: No. RoHS compliance relates to material composition and environmental regulations, not electrical or thermal performance. Both parts deliver identical functional characteristics.

Q: Are the physical dimensions identical?

A: Yes. Both parts measure 0.406" Dia x 1.902" L (10.30mm x 48.30mm) and are compatible with identical PCB layouts and mechanical assemblies.

Q: What inventory levels are available?

A: 40F25K has 727 units in stock, while 40F25KE has 959 units in stock. Availability may vary based on current demand.