Ohmite 40F4K0 Equivalent & Substitute Parts

Part Overview

The Ohmite 40F4K0 is a 4 kOhms ±1% 10W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is currently active in production and maintains 755 pieces in new original stock. The 40F4K0 is classified as RoHS non-compliant, which may necessitate identification of compliant alternatives for applications subject to RoHS regulations or procurement requirements.

Substiute Parts

40F4K0

OhmiteIn Stock: 82740F4K0 Datasheet

Current PartRFQ

40F4K0E

OhmiteIn Stock: 71940F4K0E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 40F4K0 is determined by strict equivalence across the following critical parameters:

• Resistance value: 4 kOhms
• Tolerance: ±1%
• Power rating: 10W
• Composition: Wirewound
• Temperature coefficient: ±20ppm/°C
• Package configuration: Axial
• Physical dimensions: 0.406" Dia x 1.902" L (10.30mm x 48.30mm)
• Number of terminations: 2

The identified substitute, 40F4K0E, maintains identical electrical and mechanical specifications while differing only in packaging format (Bulk versus standard packaging) and regulatory compliance status.

Parameter Comparison

Engineering Selection Recommendations

The 40F4K0E serves as a direct parametric equivalent to the 40F4K0, with identical electrical performance and mechanical compatibility. The primary distinction is regulatory compliance: the 40F4K0E achieves ROHS3 compliance, whereas the 40F4K0 remains RoHS non-compliant. Selection between these parts should be based on applicable regulatory requirements and procurement specifications. Both components maintain active production status and are available in current inventory.

Frequently Asked Questions (FAQ)

Q: Can the 40F4K0E be used as a direct replacement for the 40F4K0?

A: Yes. The 40F4K0E is electrically and mechanically equivalent. Both components share identical resistance, tolerance, power rating, temperature coefficient, and physical dimensions. Substitution is valid from a functional standpoint.

Q: What is the difference between the 40F4K0 and 40F4K0E?

A: The primary differences are packaging format (Standard versus Bulk) and RoHS compliance status. The 40F4K0E is ROHS3 compliant, while the 40F4K0 is RoHS non-compliant. All electrical and mechanical parameters are identical.

Q: Should I select the 40F4K0E if RoHS compliance is required?

A: If your application or procurement specification mandates RoHS compliance, the 40F4K0E is the appropriate selection. The 40F4K0 does not meet RoHS requirements.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the 40F4K0 and 40F4K0E measure 0.406" Dia x 1.902" L (10.30mm x 48.30mm) and use identical axial packaging. PCB layout and mechanical mounting are interchangeable.

Q: What does the "E" designation in 40F4K0E indicate?

A: The "E" suffix indicates a variant within the Ohmicone® 40 series. In this case, it denotes the bulk-packaged, RoHS3-compliant version of the base 40F4K0 part number.