40FR40E Equivalent & Substitute Parts

Part Overview

The Ohmite 40FR40E is a 10W wirewound axial resistor with 400 mOhms (0.4 Ohms) resistance and ±1% tolerance. This component is designed for through-hole applications requiring precision low-resistance dissipation in industrial and electronic equipment. The part is currently Active in product status and RoHS Compliant, making it suitable for modern manufacturing environments where regulatory compliance is mandatory.

Substitute parts are identified when equivalent electrical and mechanical parameters allow direct replacement without circuit performance degradation. The primary substitute for the 40FR40E is the 40FR40, which shares identical electrical specifications but differs in regulatory compliance status.

Substiute Parts

40FR40E

OhmiteIn Stock: 111440FR40E Datasheet

Current PartRFQ

40FR40

OhmiteIn Stock: 90340FR40 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 40FR40E is determined by the following critical parameters:

• Electrical Parameters: Resistance value (400 mOhms), tolerance (±1%), power rating (10W), and temperature coefficient (±90 ppm/°C) must be identical
• Mechanical Parameters: Package type (Axial), physical dimensions (0.406" Dia × 1.902" L), and termination count (2) must match for PCB and through-hole compatibility
• Composition: Wirewound construction must be maintained to ensure thermal and frequency response characteristics

The 40FR40 meets all electrical and mechanical substitution criteria. However, it differs in RoHS compliance status and operating temperature range specification, which may affect suitability depending on application requirements and regional regulations.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (40FR40E): Use the 40FR40E for applications requiring RoHS compliance, particularly in regulated industries, consumer electronics, and markets with environmental restrictions. The specified operating temperature range of -55°C to 275°C provides explicit thermal performance documentation.

Substitute Selection (40FR40): The 40FR40 is electrically and mechanically equivalent and may be selected for applications where RoHS compliance is not a requirement. The absence of a specified operating temperature range in the datasheet requires verification against application thermal demands before deployment.

Both parts are Active products from Ohmite's Ohmicone® 40 series, ensuring continued availability and manufacturing consistency.

Frequently Asked Questions (FAQ)

Q: Can the 40FR40 directly replace the 40FR40E in all applications?

A: Electrical and mechanical substitution is possible due to identical resistance, tolerance, power rating, composition, and physical dimensions. However, RoHS compliance requirements and operating temperature range specifications must be evaluated for your specific application before substitution.

Q: What is the significance of the RoHS compliance difference?

A: The 40FR40E is RoHS Compliant, meeting Restriction of Hazardous Substances regulations. The 40FR40 is RoHS Non-compliant. Selection depends on end-market requirements, regional regulations, and customer specifications. RoHS-regulated applications must use the 40FR40E.

Q: Are the physical dimensions identical between both parts?

A: Yes. Both the 40FR40E and 40FR40 share identical axial package dimensions of 0.406" Dia × 1.902" L (10.30 mm × 48.30 mm), ensuring compatibility with existing PCB layouts and through-hole mounting.

Q: Why is the operating temperature range not specified for the 40FR40?

A: The 40FR40 datasheet does not provide an explicit operating temperature range. The 40FR40E specifies -55°C to 275°C. Applications requiring operation outside standard ambient conditions should prioritize the 40FR40E or obtain temperature specifications from the manufacturer for the 40FR40.

Q: Are both parts from the same manufacturer and series?

A: Yes. Both the 40FR40E and 40FR40 are manufactured by Ohmite and belong to the Ohmicone® 40 series, ensuring design consistency and performance alignment.