RN732ATTD4123F50 Equivalent & Substitute Parts

Part Overview

The RN732ATTD4123F50 is a 412 kOhms ±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 the temperature range of -55°C to 155°C. The part is RoHS3 compliant with MSL 1 (Unlimited) rating.

The RN732ATTD4123F50 is classified as Obsolete. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements. Substitute components must maintain electrical compatibility while meeting or exceeding the original specifications.

Key Parameters

Parameter	Value
Resistance	412 kOhms
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 to 155°C
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the RN732ATTD4123F50 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Resistance value: 412 kOhms (exact match required)
Package format: 0805 (2012 Metric) (physical and electrical compatibility)
Composition: Thin Film (electrical performance characteristics)
Operating temperature range: -55°C to 155°C (minimum requirement)
Tolerance: ±1% or better (equal or tighter tolerance acceptable)
Power rating: 0.1W or higher (equal or greater power dissipation capability)

Compliance Parameters:

RoHS3 compliance (regulatory requirement)
MSL 1 rating (moisture sensitivity compatibility)

Substitute parts are grouped into two categories:

Direct Substitutes: Parts with identical or equivalent electrical specifications (412 kOhms ±1%, 0.1W or 0.125W, thin film, 0805 package).

Upgrade Substitutes: Parts with enhanced specifications (lower tolerance, higher power rating, or automotive qualification) that maintain full backward compatibility while providing improved performance margins.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Status	AEC-Q200
RN732ATTD4123F50	KOA Speer	412 kΩ	±1%	0.1	±50	-55 to 155	Obsolete	No
RN73R2ATTD4123F50	KOA Speer	412 kΩ	±1%	0.125	±50	-55 to 155	Active	Yes
RT0805FRE07412KL	YAGEO	412 kΩ	±1%	0.125	±50	-55 to 155	Active	No
AT0805DRE07412KL	YAGEO	412 kΩ	±0.5%	0.125	±50	-55 to 155	Active	Yes
RNCF0805BTC412K	Stackpole	412 kΩ	±0.1%	0.25	±50	-55 to 155	Active	Yes
RNCF0805DTC412K	Stackpole	412 kΩ	±0.5%	0.25	±50	-55 to 155	Active	Yes
RT0805BRE07412KL	YAGEO	412 kΩ	±0.1%	0.125	±50	-55 to 155	Active	No
RT0805CRE07412KL	YAGEO	412 kΩ	±0.25%	0.125	±50	-55 to 155	Active	No
RT0805DRE07412KL	YAGEO	412 kΩ	±0.5%	0.125	±50	-55 to 155	Active	No
RT0805FRD07412KL	YAGEO	412 kΩ	±1%	0.125	±25	-55 to 155	Active	No

Engineering Selection Recommendations

For Direct Replacement (Equivalent Specifications):

RN73R2ATTD4123F50 (KOA Speer) is the primary direct substitute. It maintains the same resistance value, tolerance, and temperature coefficient as the original part while offering a higher power rating (0.125W vs. 0.1W). This part is Active status and includes AEC-Q200 automotive qualification, providing enhanced reliability for production environments.

RT0805FRE07412KL (YAGEO) provides equivalent electrical specifications with Active status. It offers the same 412 kOhms ±1% tolerance and 0.125W power rating, making it suitable for direct substitution in non-automotive applications.

For Enhanced Performance (Upgrade Specifications):

RT0805BRE07412KL (YAGEO) offers improved tolerance (±0.1%) while maintaining the same power rating and temperature range. This upgrade is suitable for applications requiring tighter resistance tolerances.

AT0805DRE07412KL (YAGEO) combines improved tolerance (±0.5%), AEC-Q200 automotive qualification, and anti-sulfur features. This part is recommended for automotive or harsh environment applications.

RNCF0805BTC412K and RNCF0805DTC412K (Stackpole) provide the highest performance margins with 0.25W power rating and AEC-Q200 qualification. RNCF0805BTC412K offers ±0.1% tolerance, while RNCF0805DTC412K provides ±0.5% tolerance. Both are suitable for applications requiring enhanced thermal headroom and automotive reliability standards.

RT0805FRD07412KL (YAGEO) offers improved temperature coefficient (±25ppm/°C vs. ±50ppm/°C) with Active status, suitable for temperature-sensitive applications.

Selection Criteria:

Standard replacement: RN73R2ATTD4123F50 or RT0805FRE07412KL
Automotive applications: AT0805DRE07412KL, RNCF0805BTC412K, or RNCF0805DTC412K
Tight tolerance requirement: RT0805BRE07412KL or RNCF0805BTC412K
High thermal margin: RNCF0805BTC412K or RNCF0805DTC412K
Temperature stability: RT0805FRD07412KL

All substitute parts maintain RoHS3 compliance and MSL 1 rating, ensuring regulatory and environmental compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating than the original RN732ATTD4123F50?

A: Yes. A higher power rating (0.125W or 0.25W) is fully compatible and provides additional thermal margin. The physical dimensions remain identical in the 0805 package format, and higher power rating does not negatively affect circuit performance.

Q: What is the difference between ±1%, ±0.5%, ±0.25%, and ±0.1% tolerance parts?

A: Tolerance specifies the maximum deviation from the nominal 412 kOhms value. ±1% allows ±4.12 kOhms deviation; ±0.5% allows ±2.06 kOhms; ±0.25% allows ±1.03 kOhms; ±0.1% allows ±0.412 kOhms. Tighter tolerance parts are suitable for precision circuits requiring more accurate resistance values. All tolerances are backward compatible with the original ±1% specification.

Q: Are YAGEO RT series parts compatible with the original KOA Speer RN732ATTD4123F50?

A: Yes. YAGEO RT series parts with 412 kOhms ±1% (or better) tolerance, 0.125W power rating, and 0805 package are fully compatible. They maintain identical electrical performance and physical form factor.

Q: What does AEC-Q200 qualification mean?

A: AEC-Q200 is an automotive industry standard qualification for passive components. Parts with this certification have undergone rigorous testing for automotive applications, including temperature cycling, moisture resistance, and reliability validation. AEC-Q200 parts are suitable for both automotive and general industrial applications.

Q: Can I substitute a part with ±50ppm/°C temperature coefficient with one having ±25ppm/°C?

A: Yes. A lower (tighter) temperature coefficient indicates better stability across temperature variations. RT0805FRD07412KL with ±25ppm/°C provides improved temperature stability compared to the original ±50ppm/°C specification and is fully compatible.

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

A: Yes. All substitute parts use the 0805 (2012 Metric) package format with identical dimensions: 0.079" L × 0.049" W (2.00mm × 1.25mm). Physical compatibility is guaranteed for PCB layout and assembly.

Q: What is MSL 1 (Unlimited) moisture sensitivity level?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All substitute parts maintain MSL 1 rating, ensuring identical moisture sensitivity characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant, matching the regulatory compliance of the original RN732ATTD4123F50.

Q: Which substitute part should I choose for a new design?

A: For new designs, select from Active status parts. RN73R2ATTD4123F50 (KOA Speer) or RT0805FRE07412KL (YAGEO) provide direct equivalence. For automotive applications or enhanced reliability, select RNCF0805BTC412K or AT0805DRE07412KL. For precision applications, select RT0805BRE07412KL.

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