Ohmite 40F56R Equivalent & Substitute Parts

Part Overview

The Ohmite 40F56R is a 56 Ohm, 1% tolerance, 10W axial wirewound through-hole resistor from the Ohmicone® 40 series. This component is designed for applications requiring precision resistive elements with high power dissipation capability in a compact axial package. The part is currently active in production with 708 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

40F56R

OhmiteIn Stock: 80840F56R Datasheet

Current PartRFQ

40F56RE

OhmiteIn Stock: 102940F56RE Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 40F56R is determined by strict equivalence across the following critical parameters:

• Resistance value: 56 Ohms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 10W (exact match required)
• Composition: Wirewound (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Package configuration: Axial (exact match required)
• Physical dimensions: 0.406" Dia x 1.902" L (exact match required)
• Number of terminations: 2 (exact match required)

The identified substitute part meets all electrical and mechanical parameters without deviation, ensuring direct functional interchangeability in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 40F56R and 40F56RE are active production components from Ohmite's Ohmicone® 40 series with identical electrical and mechanical specifications. Selection between these parts should be based on regulatory compliance requirements and packaging needs.

The 40F56RE offers ROHS3 compliance, making it suitable for applications subject to RoHS directives. The 40F56R is RoHS non-compliant and should be selected only for applications where RoHS compliance is not required. Both parts maintain REACH Unaffected status and EAR99 export classification.

Packaging differs between the two parts: the 40F56R uses standard packaging while the 40F56RE is supplied in bulk packaging. Inventory availability is higher for the 40F56RE (946 units) compared to the 40F56R (708 units).

Frequently Asked Questions (FAQ)

Q: Can the 40F56RE be used as a direct replacement for the 40F56R?

A: Yes. The 40F56RE is a parametric equivalent with identical resistance value (56 Ohms), tolerance (±1%), power rating (10W), temperature coefficient (±20ppm/°C), composition (wirewound), package type (axial), and physical dimensions (0.406" Dia x 1.902" L). Direct substitution is electrically and mechanically compatible.

Q: What is the difference between these two parts?

A: The primary differences are RoHS compliance status and packaging format. The 40F56RE is ROHS3 compliant while the 40F56R is RoHS non-compliant. The 40F56RE is supplied in bulk packaging versus standard packaging for the 40F56R. All electrical and mechanical parameters are identical.

Q: Which part should I select for a new design?

A: Selection depends on regulatory requirements. For applications requiring RoHS compliance, specify the 40F56RE. For applications without RoHS requirements, either part is acceptable based on availability and packaging preferences.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions of 0.406" diameter by 1.902" length (10.30mm x 48.30mm), ensuring compatibility with existing PCB layouts and mechanical assemblies.

Q: What is the temperature coefficient specification?

A: Both parts have a temperature coefficient of ±20ppm/°C, indicating stable resistance performance across the operating temperature range.