Equivalent & Substitute Parts for RN732ATTD39R7B50

Part Overview

The RN732ATTD39R7B50 is a 39.7 Ohm ±0.1% thin film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.1W (1/10W) in 0805 (2012 Metric) package format. This component is classified as obsolete product status. Due to its obsolete designation, identifying equivalent and substitute parts from active product lines is necessary to maintain design continuity and ensure long-term component availability for new production runs and field replacements.

Substiute Parts

RN732ATTD39R7B50

KOA Speer Electronics, Inc.In Stock: 849RN732ATTD39R7B50 Datasheet

Current PartRFQ

RN73R2ATTD39R7B50

KOA Speer Electronics, Inc.In Stock: 904RN73R2ATTD39R7B50 Datasheet

DirectRFQ

RT0805BRD0739R7L

YAGEOIn Stock: 1148RT0805BRD0739R7L Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the RN732ATTD39R7B50 is determined by strict equivalence across the following critical parameters:

Mandatory Equivalence Parameters:

• Resistance value: 39.7 Ohms
• Tolerance: ±0.1%
• Package format: 0805 (2012 Metric)
• Composition: Thin Film
• Operating temperature range: -55°C ~ 155°C
• Moisture Sensitivity Level: 1 (Unlimited)
• RoHS compliance: ROHS3 Compliant

Allowable Variation Parameters:

• Power rating: Substitutes may have equal or higher power ratings (0.125W or greater is acceptable for 0.1W applications)
• Temperature coefficient: Substitutes may have equal or lower temperature coefficient values (±25ppm/°C is acceptable for ±50ppm/°C applications)
• Product status: Active product substitutes are preferred over obsolete designations
• Automotive qualification: Additional certifications such as AEC-Q200 do not disqualify substitution

Two substitute parts meet these criteria and are grouped as follows:

Direct Substitute (Same Manufacturer Series): RN73R2ATTD39R7B50 from KOA Speer Electronics, Inc. (RN73R series, active status)

Upgrade Substitute (Alternative Manufacturer): RT0805BRD0739R7L from YAGEO (RT series, active status)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Same Manufacturer Continuity): Select RN73R2ATTD39R7B50 when maintaining KOA Speer Electronics component lineage is required. This part is from the active RN73R series and provides identical electrical specifications with higher power rating (0.125W vs. 0.1W). The addition of AEC-Q200 automotive qualification provides enhanced reliability documentation. This substitute is suitable for applications requiring manufacturer consistency and automotive-grade component traceability.

For Upgrade Substitution (Alternative Manufacturer): Select RT0805BRD0739R7L from YAGEO when sourcing flexibility and improved temperature coefficient performance are priorities. This part offers superior temperature stability (±25ppm/°C vs. ±50ppm/°C) and higher power rating (0.125W). The RT series is actively produced with established supply chain availability. This substitute is suitable for applications where temperature coefficient performance enhancement is beneficial and multi-source component strategy is implemented.

Selection Criteria: Both substitutes maintain full electrical and mechanical compatibility with the original RN732ATTD39R7B50. Selection between them depends on supply chain strategy, manufacturer preference, and whether enhanced temperature coefficient performance is advantageous for the application. Both parts carry ROHS3 compliance and MSL 1 rating, ensuring regulatory and moisture handling equivalence.

Frequently Asked Questions (FAQ)

Q: Can RN73R2ATTD39R7B50 directly replace RN732ATTD39R7B50 in existing designs? A: Yes. Both parts share identical resistance (39.7 Ohms), tolerance (±0.1%), package format (0805), composition (thin film), and operating temperature range (-55°C ~ 155°C). The substitute has higher power rating (0.125W vs. 0.1W), which is acceptable for applications designed for 0.1W. Footprint and pinout are identical.

Q: What is the difference between the two substitute parts? A: RN73R2ATTD39R7B50 is from KOA Speer Electronics (same manufacturer as original) with ±50ppm/°C temperature coefficient and AEC-Q200 automotive qualification. RT0805BRD0739R7L is from YAGEO with superior ±25ppm/°C temperature coefficient. Both have 0.125W power rating and identical package dimensions.

Q: Is the higher power rating (0.125W) of the substitutes a concern? A: No. Higher power rating is a beneficial characteristic that does not create compatibility issues. A 0.125W-rated resistor can be used in applications designed for 0.1W without derating or performance degradation.

Q: Are there any packaging differences between these parts? A: The main part (RN732ATTD39R7B50) is supplied in standard packaging. RN73R2ATTD39R7B50 and RT0805BRD0739R7L are supplied in Tape & Reel (TR) format, which is standard for production environments. Physical dimensions and footprint remain identical (0.079" L x 0.049" W, 2.00mm x 1.25mm).

Q: Do all three parts meet RoHS and regulatory requirements? A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. Regulatory and environmental compliance is equivalent across all options.

Q: Which substitute should be selected for new production designs? A: For new production, either active substitute is appropriate. RN73R2ATTD39R7B50 maintains manufacturer continuity with KOA Speer Electronics. RT0805BRD0739R7L offers improved temperature coefficient performance and alternative sourcing. Selection depends on supply chain strategy and whether enhanced temperature stability is required.