RN732ATTD3970D100 Equivalent & Substitute Parts

Part Overview

The RN732ATTD3970D100 is a 397 Ohms ±0.5% thin film chip resistor rated at 0.1W (1/10W) in 0805 (2012 Metric) package format. This component is manufactured by KOA Speer Electronics, Inc. and features moisture-resistant construction with a temperature coefficient of ±100ppm/°C and operating range of -55°C to 155°C.

The RN732ATTD3970D100 is classified as obsolete. Locating equivalent or substitute components becomes necessary when original stock is depleted or when design flexibility permits the use of active production alternatives that maintain electrical and mechanical compatibility.

Substiute Parts

RN732ATTD3970D100

KOA Speer Electronics, Inc.In Stock: 1051RN732ATTD3970D100 Datasheet

Current PartRFQ

RN73R2ATTD3970D100

KOA Speer Electronics, Inc.In Stock: 863RN73R2ATTD3970D100 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN732ATTD3970D100 is determined by the following critical parameters:

Electrical Parameters:

• Resistance value: 397 Ohms (exact match required)
• Tolerance: ±0.5% (exact match required)
• Temperature coefficient: ±100ppm/°C (exact match required)
• Operating temperature range: -55°C to 155°C (minimum requirement)

Mechanical Parameters:

• Package / Case: 0805 (2012 Metric) (exact match required)
• Physical dimensions: 0.079" L x 0.049" W (2.00mm x 1.25mm) (exact match required)
• Height - Seated (Max): 0.024" (0.60mm) (exact match required)

Material & Composition:

• Composition: Thin Film (exact match required)
• Features: Moisture Resistant (minimum requirement)

Compliance:

• RoHS Status: ROHS3 Compliant (minimum requirement)
• Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

The substitute part RN73R2ATTD3970D100 meets all critical electrical, mechanical, and compliance parameters. The power rating difference (0.125W vs. 0.1W) represents an upgrade that does not compromise circuit performance, as the substitute can safely operate in applications designed for the lower power rating.

Parameter Comparison

Engineering Selection Recommendations

The RN73R2ATTD3970D100 is a direct substitute for the RN732ATTD3970D100 based on electrical and mechanical equivalence. The substitute part is currently in active production status, ensuring long-term availability and supply chain continuity.

The RN73R2ATTD3970D100 incorporates Automotive AEC-Q200 qualification, which exceeds the compliance requirements of the original part. This additional qualification does not introduce incompatibility and provides enhanced reliability documentation for applications requiring automotive-grade components.

The power rating increase from 0.1W to 0.125W in the substitute part represents a design margin improvement. This upgrade is functionally transparent in circuits designed for the original 0.1W specification, as the substitute component operates within the same thermal and electrical envelope.

Both parts maintain identical mechanical footprints, electrical characteristics, and environmental compliance, enabling direct substitution without circuit redesign or PCB layout modification.

Frequently Asked Questions (FAQ)

Q: Can the RN73R2ATTD3970D100 be used as a direct replacement for the RN732ATTD3970D100?

A: Yes. Both parts share identical resistance values (397 Ohms), tolerance (±0.5%), temperature coefficient (±100ppm/°C), operating temperature range (-55°C to 155°C), package format (0805), physical dimensions, and compliance certifications (ROHS3, MSL 1). The substitute part is electrically and mechanically equivalent.

Q: What is the significance of the power rating difference between the two parts?

A: The RN73R2ATTD3970D100 is rated at 0.125W (1/8W) compared to the RN732ATTD3970D100 at 0.1W (1/10W). This represents a 25% increase in power dissipation capability. In applications designed for the original 0.1W specification, the substitute part operates with additional thermal margin and does not introduce any functional or compatibility issues.

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 RN73R2ATTD3970D100 is available in Tape & Reel (TR) packaging, while the RN732ATTD3970D100 was supplied in standard packaging. Both formats are compatible with automated assembly processes.

Q: What does the Automotive AEC-Q200 qualification on the substitute part indicate?

A: AEC-Q200 is an automotive industry qualification standard for passive components. The RN73R2ATTD3970D100 meets this qualification, indicating compliance with automotive reliability and environmental stress testing requirements. This certification is applicable to automotive applications and does not restrict use in non-automotive circuits.

Q: Why is the original part classified as obsolete?

A: The RN732ATTD3970D100 is no longer in active production. The RN73R2ATTD3970D100 represents the current production equivalent from KOA Speer Electronics, Inc., offering identical electrical performance with enhanced compliance documentation and active supply chain support.

Q: Are there any circuit design considerations when substituting these parts?

A: No circuit redesign is required. The substitute part maintains all critical electrical parameters and mechanical compatibility. PCB layouts, schematic designations, and assembly processes remain unchanged.