RN732ATTD3742B50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD3742B50 is a 37.4 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 ±50ppm/°C and operates across -55°C to 155°C. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value
Resistance	37.4 kOhms
Tolerance	±0.1%
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

Substitute Part Grouping Explanation

Substitution of the RN732ATTD3742B50 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Resistance value: 37.4 kOhms (exact match required)
Tolerance: ±0.1% (exact match required)
Package: 0805 (2012 Metric) (exact match required)
Composition: Thin Film (exact match required)
Operating temperature range: -55°C minimum and 155°C maximum (minimum requirement)
Moisture Sensitivity Level: 1 (Unlimited) (minimum requirement)

Secondary Compatibility Factors:

Power rating: Equal to or greater than 0.1W (1/10W) is acceptable
Temperature coefficient: Equal to or lower absolute value is acceptable
RoHS compliance: ROHS3 Compliant preferred for regulatory alignment

Substitute parts are classified into two categories:

Direct Substitutes maintain identical power ratings (0.1W) and all primary electrical parameters.

Upgrade Substitutes feature equal or higher power ratings (0.125W, 0.2W, or 0.25W), improved temperature coefficients, or enhanced features (automotive qualification, anti-sulfur treatment) while maintaining all primary electrical parameters and package compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Features	Product Status	RoHS Status
RN732ATTD3742B50	KOA Speer Electronics	37.4k	±0.1%	0.1	±50	-55 ~ 155	Moisture Resistant	Obsolete	ROHS3
RN73R2ATTD3742B50	KOA Speer Electronics	37.4k	±0.1%	0.125	±50	-55 ~ 155	Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
RT0805BRE0737K4L	YAGEO	37.4k	±0.1%	0.125	±50	-55 ~ 155	—	Active	ROHS3
5-2176093-6	TE Connectivity Passive Product	37.4k	±0.1%	0.25	±25	-55 ~ 155	—	Active	Non-compliant
AT0805BRD0737K4L	YAGEO	37.4k	±0.1%	0.125	±25	-55 ~ 155	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
CPF0805B37K4E1	TE Connectivity Passive Product	37.4k	±0.1%	0.1	±25	-55 ~ 155	—	Active	ROHS3
CRT0805-BY-3742ELF	Bourns Inc.	37.4k	±0.1%	0.125	±25	-55 ~ 155	Current Sense	Active	ROHS3
ERA-6AEB3742V	Panasonic Electronic Components	37.4k	±0.1%	0.125	±25	-55 ~ 155	Automotive AEC-Q200	Active	ROHS3
MCU08050D3742BP100	Vishay Beyschlag/Draloric/BC Components	37.4k	±0.1%	0.125	±25	-55 ~ 125	Anti-Sulfur	Active	ROHS3
MCU08050D3742BP500	Vishay Beyschlag/Draloric/BC Components	37.4k	±0.1%	0.125	±25	-55 ~ 125	Anti-Sulfur	Active	ROHS3
PAT0805E3742BST1	Vishay Dale Thin Film	37.4k	±0.1%	0.2	±25	-55 ~ 155	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

CPF0805B37K4E1 (TE Connectivity Passive Product) is the primary direct replacement, maintaining the 0.1W power rating and all electrical parameters of the original RN732ATTD3742B50. This part is ROHS3 compliant and currently in active production status with 833 units in stock.

For Upgraded Performance (Higher Power Rating):

RN73R2ATTD3742B50 (KOA Speer Electronics) provides a direct manufacturer upgrade path, increasing power rating to 0.125W while maintaining all other specifications. This part includes automotive AEC-Q200 qualification and is available in active production status.

AT0805BRD0737K4L (YAGEO) offers 0.125W power rating with improved temperature coefficient (±25ppm/°C), anti-sulfur treatment, automotive AEC-Q200 qualification, and moisture resistance. ROHS3 compliant with active production status.

ERA-6AEB3742V (Panasonic Electronic Components) provides 0.125W power rating with automotive AEC-Q200 qualification and improved temperature coefficient (±25ppm/°C). ROHS3 compliant with the highest inventory availability (7929 units).

PAT0805E3742BST1 (Vishay Dale Thin Film) offers the highest power rating at 0.2W (1/5W) with automotive AEC-Q200 qualification, anti-sulfur treatment, and moisture resistance. Temperature coefficient improved to ±25ppm/°C. ROHS3 compliant.

For Extended Temperature Range Applications:

All recommended substitutes maintain the full -55°C to 155°C operating range except MCU08050D3742BP100 and MCU08050D3742BP500 (Vishay), which operate to -55°C to 125°C maximum. These Vishay parts include anti-sulfur treatment and improved temperature coefficient (±25ppm/°C).

Regulatory Compliance Consideration:

5-2176093-6 (TE Connectivity Passive Product) is not ROHS3 compliant and should be avoided for new designs requiring regulatory compliance, despite offering 0.25W power rating and improved temperature coefficient.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating than the original RN732ATTD3742B50?

A: Yes. The original part is rated at 0.1W (1/10W). Substitute parts rated at 0.125W (1/8W), 0.2W (1/5W), or 0.25W (1/4W) are electrically compatible and will function correctly in the circuit. Higher power ratings provide additional thermal margin and do not negatively affect circuit performance.

Q: What is the significance of the ±0.1% tolerance specification?

A: The ±0.1% tolerance is a precision specification that must be maintained in all substitutes. This tight tolerance is critical for applications requiring accurate resistance values, such as precision measurement circuits, reference networks, or high-accuracy analog signal conditioning. All listed substitutes maintain this ±0.1% tolerance.

Q: Are automotive-qualified parts (AEC-Q200) suitable for non-automotive applications?

A: Yes. Automotive AEC-Q200 qualified parts exceed standard reliability requirements and are fully compatible with non-automotive applications. These parts undergo more rigorous qualification testing and typically offer improved performance characteristics such as lower temperature coefficients and enhanced environmental resistance.

Q: What is the difference between the RN73R2ATTD3742B50 and the original RN732ATTD3742B50?

A: The RN73R2ATTD3742B50 is the active production equivalent from the same manufacturer (KOA Speer Electronics). It increases power rating from 0.1W to 0.125W, adds automotive AEC-Q200 qualification, and maintains all other electrical specifications. The "R" designation in the series name indicates the automotive-qualified variant.

Q: Can I substitute CPF0805B37K4E1 for the original part without any circuit modifications?

A: Yes. The CPF0805B37K4E1 maintains identical power rating (0.1W), resistance value (37.4 kOhms), tolerance (±0.1%), package (0805), and operating temperature range (-55°C to 155°C). The only difference is the improved temperature coefficient (±25ppm/°C versus ±50ppm/°C), which provides better performance stability across temperature variations.

Q: What does "Moisture Resistant" mean in the feature list?

A: Moisture Resistant indicates the resistor has enhanced protection against moisture absorption and environmental degradation. This is particularly important for applications exposed to humid environments or subjected to thermal cycling. The Moisture Sensitivity Level (MSL) rating of 1 (Unlimited) indicates the component can be stored indefinitely without special moisture control measures.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitute parts are packaged in 0805 (2012 Metric) format with identical footprint dimensions (0.079" L x 0.049" W / 2.00mm x 1.25mm). Physical board layout compatibility is maintained across all substitutes. Minor variations in seated height (0.022" to 0.026") do not affect PCB assembly or functionality.

Q: Which substitute offers the best overall performance upgrade?

A: PAT0805E3742BST1 (Vishay Dale Thin Film) provides the most comprehensive performance upgrade with 0.2W power rating, improved temperature coefficient (±25ppm/°C), automotive AEC-Q200 qualification, anti-sulfur treatment, and moisture resistance. This part is suitable for demanding applications requiring enhanced reliability and environmental resistance.

Q: Why is the temperature coefficient specification important for substitution?

A: Temperature coefficient (ppm/°C) specifies how much the resistance value changes per degree Celsius of temperature change. The original part has ±50ppm/°C, while most substitutes offer ±25ppm/°C. Lower temperature coefficients provide better resistance stability across the operating temperature range, reducing circuit performance drift in temperature-sensitive applications. Substitutes with equal or lower temperature coefficients are fully compatible.

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