Ohmite 40F4K7 Equivalent & Substitute Parts

Part Overview

The Ohmite 40F4K7 is a 4.7 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 736 units in new original stock. The 40F4K7 operates with a temperature coefficient of ±20ppm/°C and is housed in a 0.406" diameter by 1.902" length axial package. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same resistance value, tolerance, power rating, and physical form factor.

Substiute Parts

40F4K7

OhmiteIn Stock: 79840F4K7 Datasheet

Current PartRFQ

40F4K7E

OhmiteIn Stock: 112440F4K7E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 40F4K7 are qualified based on strict parametric equivalence. The following criteria determine substitutability:

• Resistance value: 4.7 kOhms (exact match required)
• Tolerance: ±1% (exact match required)
• Power rating: 10W (exact match required)
• Composition: Wirewound (exact match required)
• Package: Axial through-hole (exact match required)
• Temperature coefficient: ±20ppm/°C (exact match required)
• Physical dimensions: 0.406" Dia x 1.902" L (exact match required)
• Number of terminations: 2 (exact match required)

The 40F4K7E qualifies as a parametric equivalent substitute, maintaining all electrical and mechanical specifications identical to the primary part number while differing only in packaging configuration and RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

Both the 40F4K7 and 40F4K7E are active production components from Ohmite with identical electrical and mechanical specifications. Selection between these parts should be based on compliance requirements and packaging needs.

The 40F4K7E is ROHS3 compliant, making it suitable for applications subject to RoHS directives. The 40F4K7 is RoHS non-compliant and appropriate for applications without RoHS requirements. The 40F4K7E is supplied in bulk packaging, while the 40F4K7 uses standard packaging. Both parts carry EAR99 ECCN classification and are REACH unaffected. Inventory availability is higher for the 40F4K7E at 1018 units compared to 736 units for the 40F4K7.

Frequently Asked Questions (FAQ)

Q: Can the 40F4K7E replace the 40F4K7 in existing designs?

A: Yes. The 40F4K7E is a parametric equivalent with identical resistance, tolerance, power rating, composition, package type, temperature coefficient, and physical dimensions. Substitution is electrically and mechanically valid.

Q: What is the difference between the 40F4K7 and 40F4K7E?

A: The primary differences are RoHS compliance status and packaging configuration. The 40F4K7E is ROHS3 compliant and supplied in bulk packaging, while the 40F4K7 is RoHS non-compliant with standard packaging. All electrical and mechanical parameters are identical.

Q: Does RoHS compliance affect component performance?

A: RoHS compliance relates to material composition and environmental regulations, not electrical performance. Both parts deliver identical electrical characteristics and performance in circuit applications.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both the 40F4K7 and 40F4K7E measure 0.406" diameter by 1.902" length (10.30mm x 48.30mm) and use identical axial through-hole packaging.

Q: Which part should I select for new designs?

A: Selection depends on regulatory requirements. For applications requiring RoHS compliance, use the 40F4K7E. For applications without RoHS requirements, either part is suitable based on availability and packaging preferences.