RN732ATTD3920B50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD3920B50 is a 392 Ohms ±0.1% 0.1W (1/10W) chip resistor in 0805 (2012 Metric) package manufactured by KOA Speer Electronics, Inc. This thin film, moisture-resistant component operates across -55°C to 155°C with a temperature coefficient of ±50ppm/°C. The part is currently obsolete, with 1112 pieces available in new original stock. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for production and repair applications.

Key Parameters

Parameter	Value
Resistance	392 Ohms
Tolerance	±0.1%
Power Rating	0.1W (1/10W)
Package / Case	0805 (2012 Metric)
Composition	Thin Film
Operating Temperature Range	-55°C ~ 155°C
Temperature Coefficient	±50ppm/°C
Features	Moisture Resistant
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the RN732ATTD3920B50 is determined by the following critical parameters:

Mandatory Matching Parameters:

Resistance value: 392 Ohms
Tolerance: ±0.1%
Package / Case: 0805 (2012 Metric)
Composition: Thin Film
Operating Temperature Range: -55°C ~ 155°C minimum
RoHS3 Compliance
Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variation Parameters:

Power Rating: Equal or greater than 0.1W (1/10W)
Temperature Coefficient: ±50ppm/°C or better (lower values acceptable)
Features: Additional features (Automotive AEC-Q200, Anti-Sulfur) do not disqualify substitution

Substitute parts are grouped into two categories:

Direct Substitutes (Same Power Rating): Parts with 0.1W (1/10W) power rating that maintain identical electrical and mechanical specifications.

Upgrade Substitutes (Higher Power Rating): Parts with power ratings of 0.125W (1/8W), 0.2W (1/5W), 0.25W (1/4W), or 0.63W (5/8W) that provide enhanced thermal performance while maintaining all other critical parameters.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Status	AEC-Q200
RN732ATTD3920B50	KOA Speer	392 Ω	±0.1%	0.1	±50	-55 ~ 155	Obsolete	No
RN73R2ATTD3920B50	KOA Speer	392 Ω	±0.1%	0.125	±50	-55 ~ 155	Active	Yes
RNCF0805BTC392R	Stackpole Electronics	392 Ω	±0.1%	0.25	±50	-55 ~ 155	Active	Yes
7-2176091-9	TE Connectivity	392 Ω	±0.1%	0.25	±25	-55 ~ 155	Active	No
AT0805BRD07392RL	YAGEO	392 Ω	±0.1%	0.125	±25	-55 ~ 155	Active	Yes
CPF0805B392RE1	TE Connectivity	392 Ω	±0.1%	0.1	±25	-55 ~ 155	Active	No
ERA-6AEB3920V	Panasonic	392 Ω	±0.1%	0.125	±25	-55 ~ 155	Active	Yes
MCU08050D3920BP100	Vishay Beyschlag	392 Ω	±0.1%	0.125	±25	-55 ~ 125	Active	No
MCU08050D3920BP500	Vishay Beyschlag	392 Ω	±0.1%	0.125	±25	-55 ~ 125	Active	No
PAT0805E3920BST1	Vishay Dale	392 Ω	±0.1%	0.2	±25	-55 ~ 155	Active	Yes
PHP00805E3920BBT1	Vishay Dale	392 Ω	±0.1%	0.63	±25	-55 ~ 155	Active	No

Engineering Selection Recommendations

Primary Recommendation for Active Designs:

ERA-6AEB3920V (Panasonic Electronic Components) is the preferred substitute. This part maintains full compatibility with the RN732ATTD3920B50 across all critical parameters: 392 Ohms ±0.1%, 0.125W power rating, 0805 package, -55°C to 155°C operating range, and ROHS3 compliance. The part holds Automotive AEC-Q200 certification, indicating qualification for automotive applications. With 8099 pieces in stock, availability is assured. The improved temperature coefficient of ±25ppm/°C provides superior stability compared to the original ±50ppm/°C specification.

Alternative Recommendations by Application:

For applications requiring Automotive AEC-Q200 certification with enhanced thermal performance, select from:

AT0805BRD07392RL (YAGEO): 0.125W, Anti-Sulfur, AEC-Q200, ±25ppm/°C
RN73R2ATTD3920B50 (KOA Speer): 0.125W, AEC-Q200, ±50ppm/°C (maintains original temperature coefficient)
PAT0805E3920BST1 (Vishay Dale): 0.2W, Anti-Sulfur, AEC-Q200, ±25ppm/°C

For applications requiring maximum thermal margin with 0.25W power rating:

RNCF0805BTC392R (Stackpole Electronics): AEC-Q200 certified
7-2176091-9 (TE Connectivity): ±25ppm/°C temperature coefficient

For applications requiring exact power rating match (0.1W):

CPF0805B392RE1 (TE Connectivity): Active status, ±25ppm/°C temperature coefficient

Temperature Range Consideration:

MCU08050D3920BP100 and MCU08050D3920BP500 (Vishay Beyschlag) operate only to 125°C maximum, which is below the original specification of 155°C. These parts are suitable only for applications with maximum operating temperature not exceeding 125°C.

RoHS and Compliance Status:

All recommended substitutes maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited). PHP00805E3920BBT1 is RoHS non-compliant and should be selected only when RoHS exemption is documented and approved.

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, 0.2W, 0.25W, or 0.63W) are acceptable substitutes. The higher power rating provides improved thermal performance and does not affect electrical function. The resistor will operate at lower junction temperature under identical current conditions, extending component life and improving reliability.

Q: What is the significance of the temperature coefficient difference between ±50ppm/°C and ±25ppm/°C?

A: Temperature coefficient defines the fractional change in resistance per degree Celsius. A ±25ppm/°C coefficient indicates superior stability across the operating temperature range compared to ±50ppm/°C. For precision applications requiring tight tolerance maintenance across temperature extremes, the lower coefficient is advantageous. For general-purpose applications, both values are acceptable.

Q: Are Automotive AEC-Q200 certified parts required for non-automotive applications?

A: No. AEC-Q200 certification is not mandatory for non-automotive designs. However, AEC-Q200 parts undergo rigorous qualification testing and are suitable for any application. Selection of AEC-Q200 parts is optional and depends on application requirements and design specifications.

Q: Can I substitute the RN732ATTD3920B50 with MCU08050D3920BP100 or MCU08050D3920BP500?

A: These parts are compatible with the RN732ATTD3920B50 for applications with maximum operating temperature not exceeding 125°C. The original part specification extends to 155°C. If your circuit operates above 125°C, these Vishay parts are not suitable. Verify your application's maximum operating temperature before selection.

Q: What is the difference between the two Vishay MCU parts (BP100 vs. BP500)?

A: Both MCU08050D3920BP100 and MCU08050D3920BP500 are electrically and mechanically identical. The designation suffix indicates packaging quantity. Both parts meet the same electrical specifications and are interchangeable for circuit design purposes.

Q: Is the 0805 package dimension identical across all substitute parts?

A: The 0805 (2012 Metric) package is standardized at 0.079" L x 0.049" W (2.00mm x 1.25mm). All listed substitutes conform to this standard. Height variation exists: most parts are 0.024" (0.60mm) maximum seated height, while some reach 0.026" (0.65mm) or 0.033" (0.84mm) for higher power ratings. Verify PCB clearance for high-power variants in space-constrained designs.

Q: Why is the RN732ATTD3920B50 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The part remains available through existing inventory (1112 pieces in stock). For new designs or long-term production, selection of an active substitute part is recommended to ensure continued availability and supply chain stability.

Q: Can I use ERA-6AEB3920V as a direct replacement without circuit redesign?

A: Yes. ERA-6AEB3920V is a direct functional replacement. The 0805 package footprint is identical, electrical specifications are compatible, and the higher power rating (0.125W vs. 0.1W) provides improved thermal performance. No circuit redesign is required. PCB layout remains unchanged.

Q: What does ROHS3 compliance mean?

A: ROHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates the component contains no lead, cadmium, mercury, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers above specified thresholds. All recommended substitutes are ROHS3 compliant, meeting environmental and regulatory requirements for most markets.

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