RN732ATTD38R3F50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD38R3F50 is a 38.3 Ohms ±1% thin film chip resistor manufactured by KOA Speer Electronics, Inc., rated at 0.1W (1/10W) in 0805 (2012 Metric) package format. This part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design requirements and procurement needs. The resistor features moisture-resistant construction, operates across -55°C to 155°C, and complies with ROHS3 and REACH standards.

Key Parameters

Parameter	Value
Resistance	38.3 Ohms
Tolerance	±1%
Power Rating	0.1W (1/10W)
Package / Case	0805 (2012 Metric)
Composition	Thin Film
Temperature Coefficient	±50ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the RN732ATTD38R3F50 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Parameters (Must Match):

Resistance value: 38.3 Ohms
Package format: 0805 (2012 Metric)
Composition: Thin Film
Temperature coefficient: ±50ppm/°C
Operating temperature range: -55°C ~ 155°C (minimum requirement)
Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variations:

Tolerance: May be equal to or tighter than ±1% (upgrades to ±0.5%, ±0.25%, ±0.1% are acceptable)
Power rating: May be equal to or greater than 0.1W (upgrades to 0.125W or 0.25W are acceptable)
Features: Additional certifications (AEC-Q200, Anti-Sulfur) are acceptable enhancements

Substitute parts are grouped into two categories: direct equivalents (matching tolerance and power rating) and upgrades (improved tolerance and/or power rating with enhanced features).

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Temp Range (°C)	Product Status	Features
RN732ATTD38R3F50	KOA Speer	38.3 Ω	±1%	0.1	±50	-55 ~ 155	Obsolete	Moisture Resistant
RN73R2ATTD38R3F50	KOA Speer	38.3 Ω	±1%	0.125	±50	-55 ~ 155	Active	Automotive AEC-Q200, Moisture Resistant
RT0805FRE0738R3L	YAGEO	38.3 Ω	±1%	0.125	±50	-55 ~ 155	Active	Thin Film
AT0805DRE0738R3L	YAGEO	38.3 Ω	±0.5%	0.125	±50	-55 ~ 155	Active	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant
RG2012Q-38R3-D-T5	Susumu	38.3 Ω	±0.5%	0.125	±50	-55 ~ 155	Active	Anti-Sulfur, Automotive AEC-Q200
RNCF0805BTC38R3	Stackpole Electronics	38.3 Ω	±0.1%	0.25	±50	-55 ~ 155	Active	Automotive AEC-Q200
RNCF0805DTC38R3	Stackpole Electronics	38.3 Ω	±0.5%	0.25	±50	-55 ~ 155	Active	Automotive AEC-Q200
RR1220Q-38R3-D-M	Susumu	38.3 Ω	±0.5%	0.1	±50	-55 ~ 125	Active	Thin Film
RT0805BRE0738R3L	YAGEO	38.3 Ω	±0.1%	0.125	±50	-55 ~ 155	Active	Thin Film
RT0805CRE0738R3L	YAGEO	38.3 Ω	±0.25%	0.125	±50	-55 ~ 155	Active	Thin Film
RT0805DRE0738R3L	YAGEO	38.3 Ω	±0.5%	0.125	±50	-55 ~ 155	Active	Thin Film

Engineering Selection Recommendations

Direct Equivalent (Active Status):

RN73R2ATTD38R3F50 (KOA Speer) serves as the direct active equivalent. It maintains the same resistance, tolerance, and temperature coefficient as the obsolete RN732ATTD38R3F50 while offering increased power rating (0.125W vs. 0.1W) and active product status. This part includes automotive AEC-Q200 certification and moisture-resistant construction, making it suitable for direct replacement in most applications.

Standard Substitutes (Tolerance ±1%, Active Status):

RT0805FRE0738R3L (YAGEO) provides equivalent electrical performance with ±1% tolerance and 0.125W power rating. This part maintains full compatibility with the original specification and is actively manufactured.

Enhanced Tolerance Substitutes (±0.5%, Active Status):

AT0805DRE0738R3L (YAGEO) and RG2012Q-38R3-D-T5 (Susumu) offer improved tolerance (±0.5%) with 0.125W power rating. Both include automotive AEC-Q200 certification. AT0805DRE0738R3L adds anti-sulfur protection and moisture resistance. These parts are suitable for applications requiring tighter tolerance specifications.

High-Precision Substitutes (±0.1%, Active Status):

RNCF0805BTC38R3 (Stackpole Electronics) and RT0805BRE0738R3L (YAGEO) provide ±0.1% tolerance. RNCF0805BTC38R3 offers 0.25W power rating with automotive AEC-Q200 certification. These parts address applications requiring precision resistor performance.

Intermediate Tolerance Substitute (±0.25%, Active Status):

RT0805CRE0738R3L (YAGEO) offers ±0.25% tolerance with 0.125W power rating, positioned between standard and high-precision requirements.

Tolerance-Enhanced, Same Power Rating:

RR1220Q-38R3-D-M (Susumu) maintains the original 0.1W power rating with improved ±0.5% tolerance. Operating temperature range is -55°C to 125°C, which is acceptable for applications not requiring the full 155°C upper limit.

All substitute parts comply with ROHS3 and REACH standards, matching the regulatory compliance of the original component.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating than the original 0.1W specification?

A: Yes. Higher power ratings (0.125W or 0.25W) are acceptable substitutes. The resistor will function correctly in circuits designed for 0.1W components. Higher power ratings provide additional thermal margin and do not negatively impact circuit performance.

Q: What is the difference between direct equivalents and upgrades?

A: Direct equivalents maintain the same tolerance (±1%) and power rating (0.1W or 0.125W) as the original part. Upgrades offer improved tolerance (tighter than ±1%) and/or higher power ratings. Both categories maintain the same resistance value, package format, and operating temperature range.

Q: Are all substitute parts suitable for automotive applications?

A: Substitute parts with AEC-Q200 certification (RN73R2ATTD38R3F50, AT0805DRE0738R3L, RG2012Q-38R3-D-T5, RNCF0805BTC38R3, RNCF0805DTC38R3) are qualified for automotive use. Parts without this certification (YAGEO RT series, RR1220Q-38R3-D-M) are suitable for general industrial and consumer applications.

Q: Does tolerance improvement affect circuit compatibility?

A: Tighter tolerance (±0.5%, ±0.25%, ±0.1%) improves circuit accuracy without affecting compatibility. Applications designed for ±1% tolerance will function correctly with tighter tolerance components.

Q: What is the significance of the 0805 (2012 Metric) package format?

A: All substitute parts use the same 0805 (2012 Metric) package format, ensuring mechanical and electrical compatibility with PCB layouts designed for the original RN732ATTD38R3F50. Physical dimensions (0.079" L x 0.049" W / 2.00mm x 1.25mm) are consistent across all listed parts.

Q: Can I use RR1220Q-38R3-D-M if my application requires operation at 155°C?

A: No. RR1220Q-38R3-D-M operates to 125°C maximum. For applications requiring full -55°C to 155°C range, select from parts with this extended temperature specification.

Q: Are moisture-resistant features important for my selection?

A: Moisture resistance is beneficial in humid or high-moisture environments. The original part includes moisture-resistant construction. Substitute parts RN73R2ATTD38R3F50 and AT0805DRE0738R3L explicitly include this feature. Other substitutes maintain standard thin-film construction suitable for controlled environments.

Q: What does Moisture Sensitivity Level (MSL) 1 mean?

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. All listed parts maintain MSL 1 classification, ensuring no special storage or handling procedures are necessary.

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