RN732ATTD4020F25 Equivalent & Substitute Parts

Part Overview

The RN732ATTD4020F25 is a 402 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 component features moisture-resistant construction with a temperature coefficient of ±25ppm/°C and operates across -55°C to 155°C. The part is currently classified as obsolete, necessitating identification of functionally equivalent alternatives from active product lines that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Resistance	402 Ohms
Tolerance	±1%
Power Rating	0.1W (1/10W)
Package	0805 (2012 Metric)
Composition	Thin Film
Temperature Coefficient	±25ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the RN732ATTD4020F25 is determined by the following critical parameters:

Mandatory Compatibility Parameters:

Resistance value: 402 Ohms (exact match required)
Package format: 0805 (2012 Metric) (physical and electrical compatibility)
Composition: Thin Film (electrical performance characteristics)
Temperature coefficient: ±25ppm/°C or better (±10ppm/°C acceptable)
Operating temperature range: Minimum -55°C ~ 155°C coverage
Moisture Sensitivity Level: 1 (Unlimited)
RoHS3 Compliant status

Flexible Parameters (Substitution Allowed):

Tolerance: ±1% or tighter (±0.1%, ±0.05%, ±0.5% acceptable)
Power rating: Equal to or greater than 0.1W (0.125W, 0.25W acceptable)
Product status: Active preferred (obsolete parts not suitable for new designs)
Additional features: Automotive AEC-Q200, Anti-Sulfur, Moisture Resistant (value-added, not required)

Substitute parts are grouped into three categories based on tolerance and power rating enhancements while maintaining core electrical and mechanical specifications.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Temp Range (°C)	Status	Features
RN732ATTD4020F25	KOA Speer	402 Ω	±1%	0.1	±25	-55 ~ 155	Obsolete	Moisture Resistant
RN73R2ATTD4020F25	KOA Speer	402 Ω	±1%	0.125	±25	-55 ~ 155	Active	Automotive AEC-Q200, Moisture Resistant
8-2176091-0	TE Connectivity	402 Ω	±0.1%	0.25	±25	-55 ~ 155	Active	Thin Film
CPF0805B402RE1	TE Connectivity	402 Ω	±0.1%	0.1	±25	-55 ~ 155	Active	Thin Film
ERA-6AEB4020V	Panasonic	402 Ω	±0.1%	0.125	±25	-55 ~ 155	Active	Automotive AEC-Q200, Thin Film
MCU08050D4020BP100	Vishay	402 Ω	±0.1%	0.125	±25	-55 ~ 125	Active	Anti-Sulfur, Thin Film
MCU08050D4020BP500	Vishay	402 Ω	±0.1%	0.125	±25	-55 ~ 125	Active	Anti-Sulfur, Thin Film
MCU08050D4020DP500	Vishay	402 Ω	±0.5%	0.125	±25	-55 ~ 155	Active	Anti-Sulfur, Thin Film
RG2012N-4020-B-T5	Susumu	402 Ω	±0.1%	0.125	±10	-55 ~ 155	Active	Anti-Sulfur, Automotive AEC-Q200
RG2012N-4020-D-T5	Susumu	402 Ω	±0.5%	0.125	±10	-55 ~ 155	Active	Anti-Sulfur, Automotive AEC-Q200
RG2012N-4020-W-T1	Susumu	402 Ω	±0.05%	0.125	±10	-55 ~ 155	Active	Anti-Sulfur, Automotive AEC-Q200

Engineering Selection Recommendations

Direct Replacement (Same Tolerance & Power):

CPF0805B402RE1 (TE Connectivity) provides direct electrical equivalence with identical 0.1W power rating and ±1% tolerance specification. This part maintains the same operating temperature range (-55°C ~ 155°C) and achieves superior tolerance (±0.1%) while remaining in active production status. Selection of this part eliminates obsolescence risk without requiring circuit re-qualification.

Tolerance-Enhanced Substitutes (±0.1% Tolerance):

Parts 8-2176091-0, ERA-6AEB4020V, RG2012N-4020-B-T5, and MCU08050D4020BP100/BP500 offer improved tolerance specifications (±0.1%) with increased power ratings (0.125W or 0.25W). These components are suitable for applications requiring tighter resistance tolerance while maintaining full backward compatibility. ERA-6AEB4020V and RG2012N-4020-B-T5 include Automotive AEC-Q200 certification for automotive-grade applications.

Tolerance-Relaxed Substitutes (±0.5% Tolerance):

MCU08050D4020DP500 and RG2012N-4020-D-T5 provide ±0.5% tolerance with enhanced power ratings. These parts are applicable where tolerance relaxation is acceptable and additional thermal margin is beneficial. Both maintain full temperature range coverage and active product status.

Premium Precision Option (±0.05% Tolerance):

RG2012N-4020-W-T1 (Susumu) represents the highest precision option with ±0.05% tolerance, ±10ppm/°C temperature coefficient, and Automotive AEC-Q200 qualification. This part is suitable for precision measurement and automotive applications requiring superior stability.

Automotive-Grade Alternatives:

RN73R2ATTD4020F25 (KOA Speer) provides same-manufacturer continuity with Automotive AEC-Q200 certification and active status. ERA-6AEB4020V, RG2012N-4020-B-T5, and RG2012N-4020-W-T1 offer automotive-qualified alternatives with enhanced tolerance specifications.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher power rating (0.125W or 0.25W) in place of the 0.1W RN732ATTD4020F25?

A: Yes. Higher power ratings provide additional thermal margin and are electrically compatible. The 0805 package dimensions remain identical across all listed substitutes. Circuit performance is not affected by increased power rating capacity.

Q: What is the difference between ±1%, ±0.1%, and ±0.05% tolerance specifications?

A: Tolerance defines the maximum deviation from the nominal 402 Ohm resistance value. ±1% allows ±4.02 Ohms deviation; ±0.1% allows ±0.402 Ohms; ±0.05% allows ±0.201 Ohms. Tighter tolerances are suitable for precision circuits; relaxed tolerances are acceptable for general applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 Compliant status, ensuring regulatory compliance for electronic equipment manufacturing.

Q: What does Automotive AEC-Q200 certification indicate?

A: AEC-Q200 certification confirms the component meets automotive industry reliability and performance standards. Parts with this certification (RN73R2ATTD4020F25, ERA-6AEB4020V, RG2012N-4020-B-T5, RG2012N-4020-W-T1) are suitable for automotive applications requiring enhanced qualification.

Q: Can I substitute a part with ±10ppm/°C temperature coefficient for the original ±25ppm/°C specification?

A: Yes. Lower temperature coefficients (±10ppm/°C) provide superior stability across temperature variations and represent an improvement over the original specification. Parts RG2012N-4020-B-T5, RG2012N-4020-D-T5, and RG2012N-4020-W-T1 offer this enhanced performance.

Q: Which substitute offers the best overall compatibility with the RN732ATTD4020F25?

A: CPF0805B402RE1 provides the closest electrical match with identical 0.1W power rating and same operating temperature range. For applications requiring enhanced specifications, ERA-6AEB4020V or RG2012N-4020-B-T5 offer Automotive AEC-Q200 certification with improved tolerance and active product status.

Q: Are there any operating temperature range limitations I should consider?

A: MCU08050D4020BP100 and MCU08050D4020BP500 operate to -55°C ~ 125°C, which is 30°C narrower than the original -55°C ~ 155°C range. All other substitutes maintain the full original temperature range. Verify application requirements before selecting Vishay MCU parts for high-temperature environments.

Q: What is the significance of "Anti-Sulfur" feature in substitute parts?

A: Anti-Sulfur construction protects against sulfur contamination in industrial environments. This feature is present in Vishay MCU series and Susumu RG series parts, providing enhanced reliability in harsh conditions without affecting standard circuit operation.

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