RN732ATTD3972B25 Equivalent & Substitute Parts

Part Overview

The RN732ATTD3972B25 is a 39.7 kOhms ±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 features moisture-resistant construction with a temperature coefficient of ±25ppm/°C and operates across -55°C to 155°C. The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Resistance	39.7 kOhms
Tolerance	±0.1%
Power Rating	0.1W (1/10W)
Package / Case	0805 (2012 Metric)
Composition	Thin Film
Temperature Coefficient	±25ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Resistance	Yes
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RN732ATTD3972B25 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Resistance value: 39.7 kOhms
Tolerance: ±0.1%
Package format: 0805 (2012 Metric)
Composition: Thin Film
Temperature coefficient: ±25ppm/°C (or tighter)
Operating temperature range: Minimum -55°C ~ 155°C
Moisture sensitivity level: MSL 1

Allowable Variations:

Power rating: Equal to or greater than 0.1W
Manufacturer: Different manufacturers acceptable if all electrical and mechanical parameters align
Product status: Active parts acceptable as substitutes for obsolete parts
Packaging format: Tape & Reel acceptable for Tape & Reel or bulk applications
Additional features: Anti-sulfur, automotive AEC-Q200, or military ratings are acceptable enhancements

Substitutes are categorized as direct equivalents (matching power rating) or upgrades (higher power rating or enhanced features).

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Temp Range (°C)	Package	Status	RoHS
RN732ATTD3972B25	KOA Speer	39.7k	±0.1%	0.1	±25	-55 ~ 155	0805	Obsolete	ROHS3
RN73R2ATTD3972B25	KOA Speer	39.7k	±0.1%	0.125	±25	-55 ~ 155	0805	Active	ROHS3
RT0805BRD0739K7L	YAGEO	39.7k	±0.1%	0.125	±25	-55 ~ 155	0805	Active	ROHS3
TNPW080539K7BETY	Vishay Dale	39.7k	±0.1%	0.125	±25	-55 ~ 125	0805	Active	Non-compliant
PAT0805E3972BST1	Vishay Dale	39.7k	±0.1%	0.2	±25	-55 ~ 155	0805	Active	ROHS3
PHP00805E3972BBT1	Vishay Dale	39.7k	±0.1%	0.63	±25	-55 ~ 155	0805	Active	Non-compliant
TNPW080539K7BEEN	Vishay Dale	39.7k	±0.1%	0.26	±25	-55 ~ 175	0805	Active	ROHS3
TNPW080539K7BETA	Vishay Dale	39.7k	±0.1%	0.125	±25	-55 ~ 125	0805	Active	Non-compliant
TNPW080539K7BXEA	Vishay Dale	39.7k	±0.1%	0.26	±15	-55 ~ 175	0805	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

RN73R2ATTD3972B25 and RT0805BRD0739K7L are the primary direct equivalents. Both maintain the 39.7 kOhms ±0.1% specification with increased power rating (0.125W vs. 0.1W), full -55°C to 155°C operating range, and ROHS3 compliance. RN73R2ATTD3972B25 is from the original manufacturer (KOA Speer) with automotive AEC-Q200 qualification. RT0805BRD0739K7L is from YAGEO and provides equivalent electrical performance with active product status.

Upgrade Options (Enhanced Performance):

TNPW080539K7BEEN and TNPW080539K7BXEA offer increased power dissipation (0.26W) with extended operating temperature to 175°C, anti-sulfur coating, and automotive AEC-Q200 qualification. TNPW080539K7BXEA provides superior temperature coefficient (±15ppm/°C vs. ±25ppm/°C) with ROHS3 compliance. PAT0805E3972BST1 delivers 0.2W power rating with anti-sulfur and AEC-Q200 features, maintaining full temperature range and ROHS3 compliance. PHP00805E3972BBT1 provides maximum power dissipation (0.63W) with flame-proof and safety certifications for demanding applications.

Compliance Considerations:

For applications requiring ROHS3 compliance, select from: RN73R2ATTD3972B25, RT0805BRD0739K7L, PAT0805E3972BST1, TNPW080539K7BEEN, or TNPW080539K7BXEA. TNPW080539K7BETY and TNPW080539K7BETA are RoHS non-compliant and REACH-affected; use only where regulatory exemptions apply. PHP00805E3972BBT1 is RoHS non-compliant but REACH-unaffected.

Temperature Range Considerations:

The original part operates to 155°C. TNPW080539K7BETY and TNPW080539K7BETA limit operation to 125°C. TNPW080539K7BEEN and TNPW080539K7BXEA extend to 175°C for high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can RN73R2ATTD3972B25 directly replace RN732ATTD3972B25?

A: Yes. Both components share identical resistance (39.7 kOhms), tolerance (±0.1%), package (0805), temperature coefficient (±25ppm/°C), and operating range (-55°C to 155°C). RN73R2ATTD3972B25 has higher power rating (0.125W vs. 0.1W), which is acceptable for direct substitution. RN73R2ATTD3972B25 is active and ROHS3 compliant.

Q: What is the difference between direct equivalents and upgrade parts?

A: Direct equivalents maintain the original power rating or provide marginally higher power (0.125W). Upgrade parts offer enhanced specifications such as higher power dissipation (0.2W or 0.26W), extended temperature range (to 175°C), improved temperature coefficient (±15ppm/°C), or additional certifications (anti-sulfur, flame-proof, AEC-Q200). Upgrades are backward-compatible but provide additional design margin.

Q: Are Vishay Dale TNPW parts suitable replacements?

A: TNPW080539K7BEEN and TNPW080539K7BXEA are suitable for applications requiring enhanced performance and ROHS3 compliance. Both offer 0.26W power rating and extended temperature range to 175°C. TNPW080539K7BXEA provides tighter temperature coefficient (±15ppm/°C). TNPW080539K7BETY and TNPW080539K7BETA are not recommended for new designs due to RoHS non-compliance and REACH-affected status, though they remain electrically compatible.

Q: Can I use a higher power-rated resistor in place of the 0.1W original?

A: Yes. All substitute parts with equal or higher power ratings (0.125W, 0.2W, 0.26W, or 0.63W) are electrically compatible. Higher power ratings provide additional thermal margin and do not affect circuit performance when resistance, tolerance, and temperature coefficient remain constant.

Q: What packaging format should I specify for procurement?

A: The original part is available in bulk. All substitute parts listed are available in Tape & Reel (TR) format, which is standard for automated assembly. Tape & Reel packaging is compatible with both manual and automated placement processes.

Q: Which substitute offers the best temperature stability?

A: TNPW080539K7BXEA provides the tightest temperature coefficient at ±15ppm/°C compared to ±25ppm/°C for the original and most substitutes. This part also extends operating temperature to 175°C and maintains ROHS3 compliance with AEC-Q200 automotive qualification.

Q: Are there any substitutes with military specifications?

A: TNPW080539K7BETY and TNPW080539K7BETA carry military thin film designations. However, both are RoHS non-compliant and REACH-affected, limiting their use in commercial and regulated applications. For military applications requiring RoHS compliance, TNPW080539K7BEEN or TNPW080539K7BXEA with AEC-Q200 automotive qualification provide equivalent performance.

Q: What is the inventory status for substitute parts?

A: All substitute parts listed have confirmed inventory availability: RN73R2ATTD3972B25 (980 pcs), RT0805BRD0739K7L (804 pcs), TNPW080539K7BETY (663 pcs), PAT0805E3972BST1 (665 pcs), PHP00805E3972BBT1 (994 pcs), TNPW080539K7BEEN (1032 pcs), TNPW080539K7BETA (699 pcs), and TNPW080539K7BXEA (991 pcs).

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