RN732ATTD3902A25 Equivalent & Substitute Parts

Part Overview

The RN732ATTD3902A25 is a 39 kOhms ±0.05% thin film chip resistor in 0805 (2012 Metric) package rated for 0.1W (1/10W) power dissipation. This component is manufactured by KOA Speer Electronics, Inc. as part of the RN73 series and is classified as obsolete. The part features moisture-resistant construction with a temperature coefficient of ±25ppm/°C and operates across the temperature range of -55°C to 155°C. Due to its obsolete status, identifying equivalent and substitute parts is necessary for ongoing design support, production continuity, and component sourcing.

Substiute Parts

RN732ATTD3902A25

KOA Speer Electronics, Inc.In Stock: 829RN732ATTD3902A25 Datasheet

Current PartRFQ

RN73R2ATTD3902A25

KOA Speer Electronics, Inc.In Stock: 1001RN73R2ATTD3902A25 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN732ATTD3902A25 is determined by strict equivalence in the following parameters:

Critical Parameters for Substitution:

• Resistance value: 39 kOhms (exact match required)
• Tolerance: ±0.05% (exact match required)
• Package / Case: 0805 (2012 Metric) (exact match required)
• Composition: Thin Film (exact match required)
• Temperature Coefficient: ±25ppm/°C (exact match required)
• Operating Temperature Range: -55°C to 155°C (exact match required)

Allowable Variation:

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

The RN73R2ATTD3902A25 qualifies as a substitute because it maintains identical resistance, tolerance, package, composition, temperature coefficient, and operating temperature range. The power rating increase from 0.1W to 0.125W (1/8W) represents an uprating that does not compromise circuit performance. Additionally, the substitute part carries active product status and includes automotive AEC-Q200 qualification, providing enhanced availability and reliability assurance.

Parameter Comparison

Engineering Selection Recommendations

The RN73R2ATTD3902A25 is the direct substitute for the obsolete RN732ATTD3902A25. Selection of this substitute part is based on the following engineering factors:

Product Status: The main part RN732ATTD3902A25 is classified as obsolete, making the active-status RN73R2ATTD3902A25 the appropriate choice for new designs and production continuity.

Electrical Equivalence: Both parts maintain identical resistance (39 kOhms), tolerance (±0.05%), temperature coefficient (±25ppm/°C), and operating temperature range (-55°C to 155°C). The substitute's increased power rating (0.125W versus 0.1W) provides additional thermal margin without altering circuit behavior.

Compliance and Certifications: Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. The substitute part includes automotive AEC-Q200 qualification, indicating enhanced reliability screening and suitability for demanding applications.

Physical Compatibility: Identical package dimensions (0805 / 2012 Metric), footprint, and termination count ensure direct PCB-level compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the RN73R2ATTD3902A25 be used as a direct replacement for the RN732ATTD3902A25 in existing designs?

A: Yes. The substitute part maintains identical electrical specifications (resistance, tolerance, temperature coefficient, operating temperature range) and physical package dimensions. Direct PCB substitution is possible without circuit redesign.

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

A: The substitute part's higher power rating (0.125W) represents an uprating that increases thermal headroom. In applications where the original 0.1W part was operating within its power budget, the 0.125W substitute will operate at lower junction temperature, enhancing reliability. No circuit modification is required.

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

A: No. AEC-Q200 qualification indicates additional reliability screening and quality assurance. This certification does not restrict use in non-automotive applications; it only confirms the part meets automotive industry standards. The substitute is suitable for any application requiring the specified electrical and thermal characteristics.

Q: Are the physical dimensions and PCB footprints identical between the two parts?

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 (0.024" / 0.60mm). PCB footprints are interchangeable without modification.

Q: What is the moisture sensitivity level, and does it affect handling or storage?

A: Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special moisture control requirements.

Q: Are both parts RoHS compliant?

A: Yes. Both the RN732ATTD3902A25 and RN73R2ATTD3902A25 are ROHS3 compliant, meeting environmental and regulatory requirements for lead-free construction.