Ohmite 91J4R7 Equivalent & Substitute Parts

Part Overview

The Ohmite 91J4R7 is a 4.7 Ohm, 1.5W wirewound axial resistor with ±5% tolerance and flame retardant coating. This component is designed for through-hole applications requiring reliable power dissipation and safety features. The part is currently in active production status with 970 units available in inventory. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same product series, enabling procurement flexibility while preserving circuit performance.

Substiute Parts

91J4R7

OhmiteIn Stock: 101691J4R7 Datasheet

Current PartRFQ

91J4R7E

OhmiteIn Stock: 73291J4R7E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 91J4R7 are identified based on strict parametric equivalence within the Ohmite 90 series. The substitution criteria are:

• Identical resistance value: 4.7 Ohms
• Matching tolerance: ±5%
• Equal power rating: 1.5W
• Same composition: Wirewound
• Identical package configuration: Axial
• Matching temperature coefficient: ±100ppm/°C
• Equivalent physical dimensions: 0.142" Dia x 0.453" L
• Same safety features: Flame retardant coating

The 91J4R7E qualifies as a parametric equivalent based on these criteria. Packaging differences (Bulk vs. standard) do not affect electrical or mechanical compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the 91J4R7 and 91J4R7E are active production components from Ohmite's 90 series with identical electrical and mechanical specifications. Selection between these parts should be based on regulatory compliance requirements. The 91J4R7E offers ROHS3 compliance, making it suitable for applications subject to RoHS directives. The 91J4R7 remains available for applications where RoHS compliance is not required. Both parts maintain equivalent performance characteristics for circuit design purposes.

Frequently Asked Questions (FAQ)

Q: Can the 91J4R7E be used as a direct replacement for the 91J4R7?

A: Yes. The 91J4R7E is a parametric equivalent with identical resistance, tolerance, power rating, composition, package type, temperature coefficient, and physical dimensions. The parts are electrically and mechanically interchangeable.

Q: What is the difference between the 91J4R7 and 91J4R7E?

A: The primary differences are packaging format (standard vs. Bulk) and regulatory compliance. The 91J4R7E is ROHS3 compliant, while the 91J4R7 is RoHS non-compliant. Electrical and mechanical performance are identical.

Q: Are there any package or footprint differences?

A: No. Both parts use the same axial package configuration with identical physical dimensions of 0.142" Dia x 0.453" L (3.60mm x 11.50mm). PCB layout and mounting procedures are identical.

Q: Which part should be selected for new designs?

A: Selection depends on regulatory requirements. For applications requiring RoHS compliance, use the 91J4R7E. For applications without RoHS requirements, either part is suitable based on availability and procurement preferences.

Q: Are the temperature coefficients identical?

A: Yes. Both parts have a temperature coefficient of ±100ppm/°C, ensuring equivalent thermal performance across the operating range.