RN732ATTD4373C25 Equivalent & Substitute Parts

Part Overview

The RN732ATTD4373C25 is a 437 kOhms ±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 features moisture-resistant construction and operates across the temperature range of -55°C to 155°C. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement requirements.

Substiute Parts

RN732ATTD4373C25

KOA Speer Electronics, Inc.In Stock: 967RN732ATTD4373C25 Datasheet

Current PartRFQ

RN73R2ATTD4373C25

KOA Speer Electronics, Inc.In Stock: 770RN73R2ATTD4373C25 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN732ATTD4373C25 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 437 kOhms
• Tolerance: ±0.25%
• Package / Case: 0805 (2012 Metric)
• Composition: Thin Film
• Temperature Coefficient: ±25ppm/°C
• Operating Temperature Range: -55°C ~ 155°C
• Moisture Sensitivity Level: 1 (Unlimited)
• RoHS Status: ROHS3 Compliant

Allowable Variation:

• Power Rating: The substitute part may have equal or higher power rating than the original 0.1W specification, provided all other electrical and mechanical parameters remain identical.

The RN73R2ATTD4373C25 qualifies as a direct substitute based on these criteria. It maintains all mandatory electrical specifications while offering an increased power rating of 0.125W (1/8W) and includes automotive AEC-Q200 qualification, representing an enhancement over the original obsolete part.

Parameter Comparison

Engineering Selection Recommendations

The RN73R2ATTD4373C25 is the qualified substitute for the obsolete RN732ATTD4373C25. Selection of this substitute is supported by the following factors:

Product Status: The substitute part maintains active production status with KOA Speer Electronics, Inc., ensuring long-term availability and supply chain continuity compared to the obsolete original part.

Compliance & Certifications: Both parts maintain ROHS3 compliance and REACH unaffected status. The substitute part additionally carries AEC-Q200 automotive qualification, which extends application scope without compromising existing specifications.

Electrical Equivalence: All critical electrical parameters—resistance value, tolerance, temperature coefficient, and operating temperature range—are identical between the original and substitute parts.

Mechanical Compatibility: Package dimensions, termination count, and physical footprint are identical, enabling direct PCB layout compatibility without design modification.

Power Rating Enhancement: The increased power rating of 0.125W versus 0.1W provides additional thermal margin in circuit operation while maintaining all other specifications.

Frequently Asked Questions (FAQ)

Q: Can the RN73R2ATTD4373C25 be used as a direct replacement for the RN732ATTD4373C25 on existing PCBs?

A: Yes. The substitute part is mechanically and electrically compatible. Identical package dimensions (0805), footprint, and termination configuration enable direct PCB substitution without layout modification.

Q: What is the significance of the higher power rating (0.125W vs 0.1W) in the substitute part?

A: The increased power rating provides additional thermal dissipation capability. This represents an enhancement that does not compromise the original design requirements. Applications requiring 0.1W operation remain fully supported.

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

A: No. AEC-Q200 qualification represents an additional quality and reliability standard. The part remains suitable for all applications where the original part was specified, including non-automotive uses.

Q: Are the electrical characteristics identical between the two parts?

A: Yes. Resistance value (437 kOhms), tolerance (±0.25%), temperature coefficient (±25ppm/°C), and operating temperature range (-55°C ~ 155°C) are identical.

Q: What is the packaging difference between these parts?

A: The main part (RN732ATTD4373C25) is supplied in standard packaging, while the substitute (RN73R2ATTD4373C25) is supplied in Tape & Reel (TR) format. Both contain identical components; packaging format differs only in delivery method.

Q: Are both parts RoHS compliant?

A: Yes. Both the RN732ATTD4373C25 and RN73R2ATTD4373C25 are ROHS3 compliant and REACH unaffected.

Q: Why is the original part classified as obsolete?

A: Product obsolescence is determined by the manufacturer based on production discontinuation. The RN73R2ATTD4373C25 from the active RN73R series provides equivalent functionality with enhanced specifications and continued availability.