RN732ATTD3903D25 Equivalent & Substitute Parts

Part Overview

The RN732ATTD3903D25 is a 390 kOhms ±0.5% thin film chip resistor in 0805 (2012 Metric) package rated for 0.1W (1/10W) power dissipation. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design support and procurement continuity. The part features moisture-resistant construction with ±25ppm/°C temperature coefficient and operates across -55°C to 155°C temperature range.

Substiute Parts

RN732ATTD3903D25

KOA Speer Electronics, Inc.In Stock: 1181RN732ATTD3903D25 Datasheet

Current PartRFQ

RN73R2ATTD3903D25

KOA Speer Electronics, Inc.In Stock: 1179RN73R2ATTD3903D25 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RN732ATTD3903D25 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Resistance value: 390 kOhms
• Tolerance: ±0.5%
• Package / Case: 0805 (2012 Metric)
• Composition: Thin Film
• Temperature Coefficient: ±25ppm/°C
• Operating Temperature Range: -55°C to 155°C
• Number of Terminations: 2

Allowable Variation Parameters:

• Power Rating: Substitute parts may have equal or higher power rating (0.1W or greater)
• Product Status: Active parts are preferred over obsolete parts
• Certifications and Features: Additional certifications (such as AEC-Q200) do not disqualify substitution

The RN73R2ATTD3903D25 qualifies as a direct substitute based on matching all mandatory parameters while offering higher power rating (0.125W vs 0.1W) and active product status with automotive qualification.

Parameter Comparison

Engineering Selection Recommendations

The RN73R2ATTD3903D25 is the qualified substitute for the obsolete RN732ATTD3903D25. Selection rationale is based on the following engineering factors:

Product Status: The substitute part maintains active production status, ensuring long-term availability and supply chain continuity compared to the obsolete main part.

Electrical Equivalence: Both parts maintain identical resistance value (390 kOhms), tolerance (±0.5%), temperature coefficient (±25ppm/°C), and operating temperature range (-55°C to 155°C). These parameters ensure functional equivalence in circuit applications.

Power Rating: The substitute's higher power rating (0.125W vs 0.1W) provides additional thermal margin without affecting circuit performance or introducing incompatibility.

Compliance: Both parts are ROHS3 compliant with MSL 1 rating. The substitute includes AEC-Q200 automotive qualification, which does not restrict use in non-automotive applications.

Physical Compatibility: Identical package dimensions (0805 / 2012 Metric) and footprint ensure direct PCB layout compatibility without redesign requirements.

Frequently Asked Questions (FAQ)

Q: Can RN73R2ATTD3903D25 be used as a direct replacement for RN732ATTD3903D25?

A: Yes. Both parts share identical resistance value, tolerance, package, composition, temperature coefficient, and operating temperature range. The substitute's higher power rating (0.125W vs 0.1W) is compatible with applications designed for the original 0.1W part.

Q: What is the significance of the higher power rating in the substitute part?

A: The 0.125W rating in RN73R2ATTD3903D25 provides additional thermal dissipation capability. In applications where the original 0.1W part was adequate, the higher rating introduces no adverse effects and may improve thermal performance margins.

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

A: No. AEC-Q200 certification represents additional qualification testing and does not restrict the part's use in non-automotive circuits. The part remains fully compatible with general industrial and consumer applications.

Q: Are the physical dimensions identical between the main part and substitute?

A: Yes. Both parts are packaged in 0805 (2012 Metric) format with identical dimensions: 0.079" L x 0.049" W (2.00mm x 1.25mm) and maximum seated height of 0.024" (0.60mm). PCB footprints are interchangeable.

Q: What is the difference between the RN73 and RN73R series designations?

A: The RN73R series represents the active production line with enhanced features (automotive qualification) and higher power ratings. The RN73 series (including RN732A base number) is obsolete. Both series maintain identical electrical specifications for equivalent resistance values and tolerances.

Q: Are moisture sensitivity levels the same for both parts?

A: Yes. Both parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions for storage, handling, or reflow processes.