Ohmite 43J7R5E Equivalent & Substitute Parts

Part Overview

The Ohmite 43J7R5E is a 7.5 Ohms ±5% 3W through-hole resistor with axial wirewound composition, part of the Ohmicone® 40 series. This component is actively manufactured and widely used in applications requiring precision power dissipation in compact form factors. Substitute parts are identified based on matching core electrical specifications: resistance value, power rating, tolerance, and physical package compatibility.

Substiute Parts

43J7R5E

OhmiteIn Stock: 76243J7R5E Datasheet

Current PartRFQ

53J7R5E

OhmiteIn Stock: 74253J7R5E Datasheet

SimilarRFQ

43F7R5E

OhmiteIn Stock: 111643F7R5E Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Resistance value must be 7.5 Ohms
• Power rating must be 3W
• Composition must be wirewound
• Package must be axial through-hole
• Temperature coefficient ±50ppm/°C
• Tolerance may vary (±5% or ±1%)

The 43J7R5E has two identified substitutes: the 53J7R5E (same series tolerance, different physical length) and the 43F7R5E (tighter tolerance upgrade option). Both maintain identical electrical core specifications while differing in dimensional characteristics and tolerance grades.

Parameter Comparison

Engineering Selection Recommendations

43J7R5E (Primary Part): Active product status with RoHS compliance. Suitable for standard applications requiring ±5% tolerance. Ohmicone® 40 series designation indicates established design maturity.

53J7R5E (Direct Substitute): Maintains identical electrical specifications with ROHS3 compliance. Physical length is 0.551" versus 0.594", resulting in a 0.043" shorter profile. This dimension difference may affect board layout compatibility in space-constrained designs. Series designation differs (50 versus Ohmicone® 40), though electrical performance remains equivalent.

43F7R5E (Upgrade Option): Provides tighter tolerance (±1% versus ±5%) while maintaining identical power rating and physical dimensions to the main part. ROHS3 compliance and Ohmicone® 40 series alignment. Suitable for applications requiring improved resistance accuracy without dimensional changes.

Frequently Asked Questions (FAQ)

Q: Can 53J7R5E replace 43J7R5E in any application? A: Electrical substitution is valid. The 0.043" length difference (14.00mm versus 15.10mm) must be verified against PCB layout constraints and lead-forming requirements before implementation.

Q: What is the primary difference between 43J7R5E and 43F7R5E? A: Tolerance grade differs: 43J7R5E is ±5%, while 43F7R5E is ±1%. Physical dimensions and power rating are identical. The 43F7R5E is suitable for precision applications requiring tighter resistance values.

Q: Are all three parts RoHS compliant? A: Yes. The 43J7R5E carries RoHS compliance; both 53J7R5E and 43F7R5E carry ROHS3 compliance, indicating enhanced environmental standards.

Q: Does series designation (Ohmicone® 40 versus 50) affect compatibility? A: Series designation reflects product line classification. Electrical and mechanical specifications determine functional compatibility. The 53J7R5E (Series 50) is electrically equivalent despite different series designation.

Q: What is the temperature coefficient significance? A: All three parts share ±50ppm/°C temperature coefficient, ensuring consistent thermal performance across the operating range. This parameter is critical for precision applications and remains constant across all substitutes.