RN732ATTD3970A25 Equivalent & Substitute Parts

Part Overview

The RN732ATTD3970A25 is a 397 Ohms ±0.05% thin film chip resistor manufactured by KOA Speer Electronics, Inc. in the 0805 (2012 Metric) package format. This component is rated for 0.1W (1/10W) power dissipation with 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 continuity.

Substiute Parts

RN732ATTD3970A25

KOA Speer Electronics, Inc.In Stock: 818RN732ATTD3970A25 Datasheet

Current PartRFQ

RN73R2ATTD3970A25

KOA Speer Electronics, Inc.In Stock: 931RN73R2ATTD3970A25 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN732ATTD3970A25 is determined by strict equivalence in the following critical parameters:

Mandatory Equivalence Parameters:

• Resistance value: 397 Ohms
• Tolerance: ±0.05%
• Package / Case: 0805 (2012 Metric)
• Composition: Thin Film
• Temperature Coefficient: ±25ppm/°C
• Operating Temperature Range: -55°C to 155°C
• Moisture Resistant construction

Allowable Variation Parameters:

• Power Rating: Substitute parts may have equal or higher power ratings (0.125W or greater is acceptable for 0.1W applications)
• Product Status: Active status parts are preferred over obsolete classifications
• Certifications: Additional automotive or industrial certifications do not disqualify substitution

The RN73R2ATTD3970A25 meets all mandatory equivalence criteria while offering enhanced specifications through higher power rating (0.125W) and active product status with AEC-Q200 automotive qualification.

Parameter Comparison

Engineering Selection Recommendations

The RN73R2ATTD3970A25 is the direct substitute for the obsolete RN732ATTD3970A25. Selection of this substitute is based on the following engineering factors:

Product Status Consideration: The RN732ATTD3970A25 is classified as obsolete, creating supply chain risk. The RN73R2ATTD3970A25 maintains active product status, ensuring long-term availability and manufacturing continuity.

Electrical Equivalence: Both parts maintain identical resistance (397 Ohms), tolerance (±0.05%), temperature coefficient (±25ppm/°C), and operating temperature range (-55°C to 155°C). These parameters ensure functional interchangeability in circuit applications.

Power Rating Enhancement: The substitute part provides 0.125W power rating compared to the main part's 0.1W rating. This represents a 25% increase in power dissipation capability, which is compatible with applications designed for the lower-rated component.

Compliance and Certifications: Both parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. The substitute part includes AEC-Q200 automotive qualification, which does not restrict use in non-automotive applications and provides additional quality assurance.

Physical Compatibility: Identical 0805 (2012 Metric) package dimensions and termination configuration ensure direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the RN73R2ATTD3970A25 be used as a direct replacement for the RN732ATTD3970A25?

A: Yes. The RN73R2ATTD3970A25 is electrically and mechanically equivalent to the RN732ATTD3970A25. Both parts share identical resistance value, tolerance, temperature coefficient, operating temperature range, package format, and thin film composition. The substitute part is suitable for direct PCB substitution without circuit redesign.

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

A: The RN73R2ATTD3970A25 is rated for 0.125W compared to the main part's 0.1W. This higher rating provides additional thermal margin in the same physical package. Applications designed for 0.1W operation will operate within the thermal limits of the 0.125W-rated substitute part.

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

A: No. AEC-Q200 qualification represents an additional quality and reliability standard. Parts meeting automotive standards are suitable for general industrial and commercial applications without restriction.

Q: Are there any package or footprint differences between these parts?

A: No. 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). PCB footprints are identical.

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

A: The RN73R series represents an enhanced product line with active manufacturing status and automotive qualification. The RN73 series includes the obsolete RN732ATTD3970A25. Both series share identical electrical and mechanical specifications for equivalent part numbers.

Q: Are both parts RoHS compliant?

A: Yes. Both the RN732ATTD3970A25 and RN73R2ATTD3970A25 are ROHS3 compliant with REACH unaffected status, suitable for applications requiring environmental compliance.