Equivalent & Substitute Parts for Ohmite 40FR75

Part Overview

The Ohmite 40FR75 is a 750 mOhms ±1% 10W through-hole resistor with axial wirewound construction, part of the Ohmicone® 40 series. This component is designed for applications requiring precision current-sensing and power dissipation in axial package format. The part maintains active product status with 692 units in current inventory. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across alternative series offerings from the same manufacturer.

Substiute Parts

40FR75

OhmiteIn Stock: 76040FR75 Datasheet

Current PartRFQ

80FR75

OhmiteIn Stock: 117380FR75 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Ohmite 80FR75 qualifies as a manufacturer-recommended substitute for the 40FR75 based on the following critical parameters:

• Electrical Equivalence: Identical resistance value (750 mOhms), tolerance (±1%), power rating (10W), and temperature coefficient (±90ppm/°C)
• Mechanical Compatibility: Both parts utilize axial wirewound construction with two terminations and identical body diameter (0.406" / 10.30mm)
• Functional Interchangeability: The substitute maintains the same electrical performance characteristics required for current-sensing and power dissipation applications
• Series Differentiation: The 80FR75 belongs to the Acrasil® 80 series, while the 40FR75 belongs to the Ohmicone® 40 series; both are active Ohmite product lines

The primary distinction between these parts is the axial length: the 40FR75 measures 1.902" (48.30mm) while the 80FR75 measures 1.843" (46.80mm), a difference of 0.059" that may be relevant in space-constrained applications.

Parameter Comparison

Engineering Selection Recommendations

Both the 40FR75 and 80FR75 maintain active product status with Ohmite and share identical electrical specifications. Selection between these parts should be based on:

• PCB Layout Constraints: The 80FR75 provides a 0.059" shorter axial length, which may accommodate tighter board layouts or component spacing requirements
• Inventory Availability: The 80FR75 currently maintains higher inventory (1,104 units) compared to the 40FR75 (692 units)
• Compliance Requirements: Both parts carry identical RoHS non-compliant status and are subject to the same regulatory classifications (ECCN: EAR99; HTSUS: 8533.21.0080)
• Series Continuity: If series-specific performance characteristics are required, the original Ohmicone® 40 series should be maintained; otherwise, the Acrasil® 80 series provides equivalent functionality

Frequently Asked Questions (FAQ)

Q: Are the 40FR75 and 80FR75 electrically identical? A: Yes. Both parts provide 750 mOhms resistance at ±1% tolerance with 10W power rating and ±90ppm/°C temperature coefficient. Electrical performance is equivalent.

Q: What is the primary difference between these parts? A: The axial length differs by 0.059 inches (1.902" versus 1.843"). Both maintain identical body diameter and all electrical specifications.

Q: Can the 80FR75 be used as a direct replacement in existing designs? A: The 80FR75 can be substituted where axial length tolerance permits. Verify PCB layout and component spacing accommodate the slightly shorter dimension.

Q: Do both parts have the same RoHS compliance status? A: Both parts are RoHS non-compliant. Regulatory status is identical between the two options.

Q: Which part should be selected for new designs? A: Selection depends on available inventory, PCB layout requirements, and series preference. Both parts are active products suitable for new applications.

Q: Are there any thermal or reliability differences between the series? A: No differences are specified in the provided parameters. Both parts maintain identical temperature coefficient and operating characteristics.