RN732ATTD3971B10 Equivalent & Substitute Parts

Part Overview

The RN732ATTD3971B10 is a 3.97 kOhms ±0.1% thin film chip resistor manufactured by KOA Speer Electronics, Inc. in 0805 (2012 Metric) package format. This component is rated for 0.1W (1/10W) power dissipation with a temperature coefficient of ±10ppm/°C and operates across -55°C to 155°C. The part features moisture-resistant construction and is ROHS3 compliant with MSL 1 rating.

The RN732ATTD3971B10 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for applications utilizing this resistor specification.

Substiute Parts

RN732ATTD3971B10

KOA Speer Electronics, Inc.In Stock: 1118RN732ATTD3971B10 Datasheet

Current PartRFQ

RN73R2ATTD3971B10

KOA Speer Electronics, Inc.In Stock: 1094RN73R2ATTD3971B10 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN732ATTD3971B10 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 3.97 kOhms
• Tolerance: ±0.1%
• Package / Case: 0805 (2012 Metric)
• Composition: Thin Film
• Temperature Coefficient: ±10ppm/°C
• Operating Temperature Range: -55°C ~ 155°C
• Moisture Resistant feature

Allowable Variation Parameters:

• Power Rating: The substitute may have equal or higher power rating (0.1W or greater)
• Product Status: Active status preferred for obsolete parts
• Certifications and Compliance: Additional certifications (such as AEC-Q200) are allowable additions

The substitute part RN73R2ATTD3971B10 meets all mandatory matching parameters while providing enhanced power rating (0.125W vs. 0.1W) and automotive qualification (AEC-Q200), making it a valid substitute for the obsolete RN732ATTD3971B10.

Parameter Comparison

Engineering Selection Recommendations

The RN73R2ATTD3971B10 is the direct substitute for the obsolete RN732ATTD3971B10. Both parts are manufactured by KOA Speer Electronics, Inc. and share identical electrical specifications (3.97 kOhms ±0.1%, ±10ppm/°C temperature coefficient) and physical package dimensions (0805 / 2012 Metric).

The substitute part provides the following advantages:

Active Product Status: The RN73R2ATTD3971B10 is currently active in production, ensuring long-term availability and supply chain continuity compared to the obsolete RN732ATTD3971B10.

Enhanced Power Rating: The substitute offers 0.125W (1/8W) power rating versus the original 0.1W (1/10W), providing additional thermal margin in applications without requiring design modification.

Automotive Qualification: The RN73R2ATTD3971B10 carries AEC-Q200 automotive qualification, meeting stringent reliability and quality standards. This certification is applicable to automotive and high-reliability applications.

Regulatory Compliance: Both parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 rating, ensuring compatibility with current environmental and regulatory requirements.

The substitute part is electrically and mechanically interchangeable with the original part for all applications within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the RN73R2ATTD3971B10 directly replace the RN732ATTD3971B10 in existing designs?

A: Yes. The RN73R2ATTD3971B10 is electrically and mechanically equivalent to the RN732ATTD3971B10. Both parts have identical resistance (3.97 kOhms), tolerance (±0.1%), temperature coefficient (±10ppm/°C), operating temperature range (-55°C ~ 155°C), and 0805 package dimensions. The substitute part is a direct replacement.

Q: What is the difference in power rating between these parts?

A: The RN732ATTD3971B10 is rated for 0.1W (1/10W), while the RN73R2ATTD3971B10 is rated for 0.125W (1/8W). The substitute part has a higher power rating, which provides additional thermal headroom. This difference does not affect compatibility; the substitute can be used in applications designed for the original part.

Q: Are the physical dimensions identical?

A: Yes. Both parts use the 0805 (2012 Metric) package with identical dimensions: 0.079" L x 0.049" W (2.00mm x 1.25mm) and maximum seated height of 0.024" (0.60mm). They are footprint-compatible on PCBs designed for the original part.

Q: What does AEC-Q200 qualification mean?

A: AEC-Q200 is an automotive industry standard qualification that certifies component reliability and quality for automotive applications. The RN73R2ATTD3971B10 carries this certification, making it suitable for automotive and high-reliability environments. The original RN732ATTD3971B10 does not carry this certification.

Q: Are both parts RoHS compliant?

A: Yes. Both the RN732ATTD3971B10 and RN73R2ATTD3971B10 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the MSL rating, and why does it matter?

A: Both parts have MSL (Moisture Sensitivity Level) rating of 1, which means unlimited shelf life with no special moisture control requirements during storage or handling. This simplifies inventory management and logistics.

Q: Why is the original part listed as obsolete?

A: The RN732ATTD3971B10 is obsolete, meaning it is no longer in active production. The RN73R2ATTD3971B10 from the RN73R series is the active replacement, offering the same electrical performance with enhanced specifications and automotive qualification.