ES3WR07J Equivalent & Substitute Parts

Part Overview

The ES3WR07J is a 70 mOhms ±5% 3W axial wirewound resistor manufactured by TE Connectivity Passive Product. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing procurement and design requirements. The part features flame-proof and safety-rated construction suitable for through-hole applications requiring low-resistance current-limiting or sensing functionality.

Substiute Parts

ES3WR07J

TE Connectivity Passive ProductIn Stock: 976ES3WR07J Datasheet

Current PartRFQ

MT2B-0R07F2

RiedonIn Stock: 1354MT2B-0R07F2 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ES3WR07J is determined by the following critical parameters:

Electrical Parameters:

• Resistance value: 70 mOhms (exact match required)
• Power rating: 3W (minimum requirement)
• Package configuration: Axial through-hole (mechanical compatibility)

Compliance Parameters:

• RoHS3 compliance (regulatory requirement)
• Flame-proof and safety-rated construction (application safety requirement)

The MT2B-0R07F2 from Riedon qualifies as a substitute based on matching resistance value, power rating, and axial package configuration. While the substitute exhibits superior tolerance (±1% versus ±5%) and enhanced features (current sense, moisture resistant, non-inductive, pulse withstanding), these represent functional improvements rather than deviations from the core substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

The MT2B-0R07F2 is suitable for direct substitution of the obsolete ES3WR07J based on the following factors:

Electrical Compatibility: Both components provide identical 70 mOhms resistance at 3W power rating, meeting the core functional requirements of the application.

Regulatory Compliance: Both parts maintain ROHS3 compliance and carry flame-proof, safety-rated construction, satisfying regulatory and safety mandates.

Product Availability: The MT2B-0R07F2 maintains active product status with 1294 units in stock, compared to the obsolete ES3WR07J with limited remaining inventory of 882 units.

Physical Compatibility: Both components utilize axial through-hole packaging with two terminations, enabling direct mechanical substitution in existing PCB layouts. Minor dimensional variations (diameter and length) fall within typical component placement tolerances for through-hole applications.

Composition Difference: The MT2B-0R07F2 employs thick-film construction versus the wirewound composition of the ES3WR07J. This compositional difference, combined with the superior ±1% tolerance and additional features (current sense, moisture resistant, non-inductive, pulse withstanding), represents an enhancement for applications requiring improved precision and environmental robustness.

Frequently Asked Questions (FAQ)

Q: Can the MT2B-0R07F2 directly replace the ES3WR07J in existing designs?

A: Yes. Both components share identical resistance (70 mOhms), power rating (3W), and axial through-hole package configuration. The MT2B-0R07F2 provides equivalent electrical performance with improved tolerance and additional protective features.

Q: What is the significance of the tolerance difference between ±5% and ±1%?

A: The ES3WR07J specifies ±5% tolerance, while the MT2B-0R07F2 specifies ±1% tolerance. The tighter tolerance of the substitute part provides greater precision in resistance value, which is advantageous for applications requiring accurate current sensing or voltage division. Applications designed for ±5% tolerance operate within the ±1% specification without modification.

Q: Are there physical placement considerations due to dimensional differences?

A: The MT2B-0R07F2 exhibits slightly different dimensions (0.200" Dia x 0.580" L) compared to the ES3WR07J (0.217" Dia x 0.512" L). These variations are minor and fall within standard through-hole component placement tolerances. PCB layouts designed for axial components accommodate this dimensional range without modification.

Q: What does "current sense" mean in the context of the MT2B-0R07F2?

A: Current sense indicates the component is designed for applications where the voltage drop across the resistor is measured to determine circuit current. This is a standard application for low-value precision resistors and does not restrict use in other applications.

Q: Are both components RoHS compliant?

A: Yes. Both the ES3WR07J and MT2B-0R07F2 are ROHS3 compliant, meeting regulatory requirements for hazardous substance restrictions.

Q: Why is the ES3WR07J classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The MT2B-0R07F2 provides an active, readily available alternative with equivalent core specifications and enhanced performance characteristics.