Ohmite 40F400 Equivalent & Substitute Parts

Part Overview

The Ohmite 40F400 is a 400 Ohm, ±1% tolerance, 10W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is classified as Active product status and is suitable for applications requiring precision resistive elements in power dissipation circuits. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across alternative packaging or compliance configurations, ensuring design flexibility without compromising circuit performance.

Substiute Parts

40F400

OhmiteIn Stock: 83240F400 Datasheet

Current PartRFQ

40F400E

OhmiteIn Stock: 112440F400E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Ohmite 40F400 is determined by strict equivalence across the following parameters:

• Resistance value: 400 Ohms
• Tolerance: ±1%
• Power rating: 10W
• Composition: Wirewound
• Package configuration: 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 40F400E maintains identical electrical and mechanical specifications. Differences are limited to packaging configuration (Bulk versus standard) and RoHS compliance status, which do not affect functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 40F400 and 40F400E are Active status components suitable for production use. Selection between these parts is determined by regulatory and compliance requirements:

The 40F400E is specified for applications requiring ROHS3 compliance. The 40F400 is applicable where RoHS non-compliant components are acceptable. Both parts maintain identical electrical performance, mechanical fit, and thermal characteristics. Inventory availability should be evaluated based on procurement lead times and supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can the 40F400E replace the 40F400 in existing designs?

A: Yes. The 40F400E is electrically and mechanically equivalent. Substitution is valid for all circuit applications. The primary difference is RoHS compliance status and packaging configuration.

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

A: Packaging configuration refers to the quantity and presentation method for component shipment. Bulk packaging typically indicates larger quantity orders. This does not affect the component's electrical or mechanical performance in the circuit.

Q: Are there any thermal or performance differences between these parts?

A: No. Both parts share identical resistance values, tolerance specifications, power ratings, temperature coefficients, and physical dimensions. Thermal and electrical performance are equivalent.

Q: Which part should be selected for new designs?

A: Selection depends on regulatory requirements. For designs requiring ROHS3 compliance, specify the 40F400E. For applications without RoHS requirements, either part is acceptable based on availability and cost considerations.

Q: Are the axial dimensions identical for both parts?

A: Yes. Both the 40F400 and 40F400E maintain the same physical dimensions of 0.406" Dia x 1.902" L (10.30mm x 48.30mm), ensuring identical PCB layout and mechanical fit.