RN732ATTD40R7C50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD40R7C50 is a 40.7 Ohm ±0.25% thin film chip resistor manufactured by KOA Speer Electronics, Inc. in 0805 (2012 Metric) package format with 0.1W power rating. This component is classified as obsolete product status, necessitating identification of active equivalent alternatives for ongoing design requirements and procurement continuity.

Substiute Parts

RN732ATTD40R7C50

KOA Speer Electronics, Inc.In Stock: 1103RN732ATTD40R7C50 Datasheet

Current PartRFQ

RN73R2ATTD40R7C50

KOA Speer Electronics, Inc.In Stock: 818RN73R2ATTD40R7C50 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN732ATTD40R7C50 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 40.7 Ohms
• Tolerance: ±0.25%
• Package / Case: 0805 (2012 Metric)
• Composition: Thin Film
• Temperature Coefficient: ±50ppm/°C
• Operating Temperature Range: -55°C ~ 155°C
• Moisture Resistant feature

Allowable Variation Parameters:

• Power Rating: Equal or greater than 0.1W
• Product Status: Active preferred over obsolete
• Compliance certifications: ROHS3 and additional automotive ratings acceptable

The RN73R2ATTD40R7C50 qualifies as a direct substitute based on identical electrical specifications and package dimensions, with the allowable difference of increased power rating (0.125W vs 0.1W) and active product status.

Parameter Comparison

Engineering Selection Recommendations

The RN73R2ATTD40R7C50 is the direct substitute for the obsolete RN732ATTD40R7C50. Selection rationale is based on the following engineering factors:

Product Status Transition: The main part is classified as obsolete, while the substitute maintains active product status from KOA Speer Electronics, Inc., ensuring long-term availability and supply chain continuity.

Electrical Equivalence: All critical electrical parameters are identical, including resistance value, tolerance, temperature coefficient, and operating temperature range. These parameters determine functional performance in circuit applications.

Package Compatibility: Both parts utilize the 0805 (2012 Metric) package with identical physical dimensions and termination configuration, enabling direct PCB footprint compatibility without layout modifications.

Power Rating Enhancement: The substitute part features a higher power rating (0.125W vs 0.1W), which provides additional thermal margin in the application without introducing any functional incompatibility.

Compliance Alignment: Both parts maintain ROHS3 compliance. The substitute includes AEC-Q200 automotive qualification, which represents an enhancement in reliability certification without creating incompatibility for non-automotive applications.

Moisture Resistance: Both parts incorporate moisture-resistant thin film construction, maintaining environmental performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can RN73R2ATTD40R7C50 be used as a direct replacement for RN732ATTD40R7C50 in existing designs?

A: Yes. The substitute part meets all mandatory electrical and mechanical parameters. Identical resistance, tolerance, package dimensions, and operating temperature range ensure functional equivalence. The higher power rating and active product status present no compatibility issues.

Q: What is the significance of the power rating difference (0.1W vs 0.125W)?

A: The substitute part has a higher power dissipation capability. In applications where the original 0.1W rating was adequate, the 0.125W rating provides additional thermal margin. This represents an enhancement, not a limitation.

Q: Are there packaging differences between these parts?

A: Both parts are supplied in 0805 (2012 Metric) package format with identical physical dimensions (0.079" L x 0.049" W, 2.00mm x 1.25mm) and maximum seated height (0.024", 0.60mm). The substitute is available in Tape & Reel (TR) packaging format, which is standard for active production parts.

Q: Does the AEC-Q200 automotive qualification on the substitute part affect non-automotive applications?

A: No. AEC-Q200 qualification represents an additional reliability certification that does not restrict use in non-automotive applications. The part remains fully compatible with all applications suitable for the original component.

Q: What is the basis for substitution compatibility?

A: Substitution is based on matching resistance value (40.7 Ohms), tolerance (±0.25%), package type (0805), composition (thin film), temperature coefficient (±50ppm/°C), operating temperature range (-55°C ~ 155°C), and moisture-resistant feature. The substitute meets or exceeds all these parameters.

Q: Is the obsolete status of the main part a concern for new designs?

A: Yes. The main part is classified as obsolete, indicating discontinued production. The substitute part maintains active status, ensuring availability for new designs and ongoing procurement requirements.