RN732ATTD4022F25 Equivalent & Substitute Parts

Part Overview

The RN732ATTD4022F25 is a 40.2 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 is classified as obsolete product status. Due to its obsolete designation, equivalent and substitute parts with active product status are necessary to ensure continued design support, procurement availability, and long-term supply chain reliability. Substitute parts maintain the core electrical specifications while offering enhanced features, improved tolerances, or active manufacturing status.

Key Parameters

Parameter	Value	Specification Type
Resistance	40.2 kOhms	Mandatory
Tolerance	±1%	Mandatory
Power Rating	0.1W (1/10W)	Mandatory
Package / Case	0805 (2012 Metric)	Mandatory
Composition	Thin Film	Mandatory
Temperature Coefficient	±25ppm/°C	Mandatory
Operating Temperature Range	-55°C ~ 155°C	Mandatory
RoHS Status	ROHS3 Compliant	Mandatory
Moisture Sensitivity Level	1 (Unlimited)	Mandatory

Substitute Part Grouping Explanation

Substitution logic for the RN732ATTD4022F25 is based on strict electrical and mechanical parameter matching within the 0805 package format. All substitute parts must maintain:

Core Electrical Parameters (Non-Negotiable):

Resistance value: 40.2 kOhms
Package format: 0805 (2012 Metric)
Composition: Thin Film
Temperature coefficient: ±25ppm/°C
Operating temperature range: -55°C ~ 155°C
RoHS3 compliance
MSL rating: 1 (Unlimited)

Tolerance and Power Rating Flexibility: Substitute parts are grouped into two categories based on tolerance and power rating enhancements:

Direct Substitutes (Same Tolerance ±1%, Equal or Higher Power Rating): Parts maintaining ±1% tolerance with 0.125W (1/8W) or higher power ratings provide direct functional replacement with improved thermal margin.
Upgrade Substitutes (Improved Tolerance ±0.1% to ±0.5%, Equal or Higher Power Rating): Parts with tighter tolerance specifications (±0.1%, ±0.25%, ±0.5%) and equal or higher power ratings offer enhanced precision and reliability for applications requiring stricter component performance.

All substitute parts are active product status, ensuring procurement availability and manufacturer support.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff	Op Temp Range	Package	Status	Features
RN732ATTD4022F25	KOA Speer	40.2 kΩ	±1%	0.1	±25ppm/°C	-55~155°C	0805	Obsolete	Moisture Resistant
RN73R2ATTD4022F25	KOA Speer	40.2 kΩ	±1%	0.125	±25ppm/°C	-55~155°C	0805	Active	Automotive AEC-Q200, Moisture Resistant
RT0805FRD0740K2L	YAGEO	40.2 kΩ	±1%	0.125	±25ppm/°C	-55~155°C	0805	Active	Thin Film
5-2176093-8	TE Connectivity	40.2 kΩ	±0.1%	0.25	±25ppm/°C	-55~155°C	0805	Active	Thin Film
AT0805BRD0740K2L	YAGEO	40.2 kΩ	±0.1%	0.125	±25ppm/°C	-55~155°C	0805	Active	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant
AT0805CRD0740K2L	YAGEO	40.2 kΩ	±0.25%	0.125	±25ppm/°C	-55~155°C	0805	Active	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant
AT0805DRD0740K2L	YAGEO	40.2 kΩ	±0.5%	0.125	±25ppm/°C	-55~155°C	0805	Active	Anti-Sulfur, Automotive AEC-Q200, Moisture Resistant
CPF0805B40K2E1	TE Connectivity	40.2 kΩ	±0.1%	0.1	±25ppm/°C	-55~155°C	0805	Active	Thin Film
CRT0805-BY-4022ELF	Bourns Inc.	40.2 kΩ	±0.1%	0.125	±25ppm/°C	-55~155°C	0805	Active	Current Sense Thin Film
ERA-6AEB4022V	Panasonic	40.2 kΩ	±0.1%	0.125	±25ppm/°C	-55~155°C	0805	Active	Automotive AEC-Q200
MCU08050D4022BP100	Vishay Beyschlag	40.2 kΩ	±0.1%	0.125	±25ppm/°C	-55~125°C	0805	Active	Anti-Sulfur

Engineering Selection Recommendations

For Direct Replacement (Same Tolerance ±1%):

RN73R2ATTD4022F25 (KOA Speer) is the primary direct substitute, maintaining ±1% tolerance with increased power rating (0.125W) and active product status. This part includes Automotive AEC-Q200 qualification and moisture resistance, providing enhanced reliability over the obsolete original. RT0805FRD0740K2L (YAGEO) offers equivalent electrical performance with active status and identical tolerance specification.

For Precision Applications (Improved Tolerance ±0.1%):

CPF0805B40K2E1 (TE Connectivity) maintains the original 0.1W power rating while providing ±0.1% tolerance and active product status. This selection is appropriate when the original power specification must be preserved without tolerance compromise.

AT0805BRD0740K2L (YAGEO) combines ±0.1% tolerance with Automotive AEC-Q200 qualification, anti-sulfur coating, and moisture resistance. This part is suitable for automotive or harsh environment applications requiring precision performance.

5-2176093-8 (TE Connectivity) offers the highest power rating (0.25W) with ±0.1% tolerance, providing maximum thermal margin and precision for demanding applications.

For Automotive Applications:

ERA-6AEB4022V (Panasonic) provides Automotive AEC-Q200 qualification with ±0.1% tolerance and active product status. This part is recommended for automotive circuit designs requiring certified component qualification.

AT0805CRD0740K2L and AT0805DRD0740K2L (YAGEO) offer Automotive AEC-Q200 qualification with ±0.25% and ±0.5% tolerances respectively, providing cost-effective alternatives for automotive applications with relaxed tolerance requirements.

For Current Sensing Applications:

CRT0805-BY-4022ELF (Bourns Inc.) is designated as a current sense resistor with ±0.1% tolerance and active product status, suitable for precision current measurement circuits.

Operating Temperature Consideration:

MCU08050D4022BP100 (Vishay Beyschlag) operates to 125°C maximum, compared to 155°C for all other parts. This part is suitable for applications with maximum operating temperature not exceeding 125°C.

All recommended substitutes maintain ROHS3 compliance and MSL rating 1 (Unlimited), ensuring compatibility with standard manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q1: Can RN73R2ATTD4022F25 directly replace RN732ATTD4022F25 in existing designs?

A: Yes. RN73R2ATTD4022F25 maintains identical electrical specifications (40.2 kOhms ±1%, ±25ppm/°C, -55°C to 155°C operating range) and package format (0805). The increased power rating (0.125W vs. 0.1W) provides additional thermal margin without affecting circuit performance. Both parts are thin film composition with moisture resistance. The primary advantage is active product status and Automotive AEC-Q200 qualification.

Q2: What is the difference between direct substitutes and upgrade substitutes?

A: Direct substitutes (RN73R2ATTD4022F25, RT0805FRD0740K2L) maintain the original ±1% tolerance specification with equal or higher power ratings. Upgrade substitutes offer improved tolerance specifications (±0.1%, ±0.25%, ±0.5%) with equal or higher power ratings, providing enhanced precision for applications requiring tighter component performance. Both categories maintain identical resistance value, package format, and operating temperature range.

Q3: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL rating 1 (Unlimited), ensuring compatibility with standard manufacturing processes and storage conditions.

Q4: Which substitute part should be selected for automotive applications?

A: ERA-6AEB4022V (Panasonic), AT0805BRD0740K2L, AT0805CRD0740K2L, and AT0805DRD0740K2L (YAGEO) all carry Automotive AEC-Q200 qualification. ERA-6AEB4022V and AT0805BRD0740K2L provide ±0.1% tolerance for precision requirements. AT0805CRD0740K2L and AT0805DRD0740K2L offer ±0.25% and ±0.5% tolerances respectively for cost-optimized designs. RN73R2ATTD4022F25 also includes AEC-Q200 qualification with ±1% tolerance.

Q5: What is the significance of the 0805 package format?

A: The 0805 (2012 Metric) package format specifies physical dimensions of 0.079" L x 0.049" W (2.00mm x 1.25mm) with maximum seated height of 0.024" to 0.026" depending on manufacturer. All substitute parts maintain this identical package format, ensuring mechanical compatibility with existing PCB layouts and assembly equipment without design modification.

Q6: Can parts with different tolerance specifications be mixed in the same circuit?

A: Tolerance specifications determine component value accuracy. Parts with ±1% tolerance (RN732ATTD4022F25, RN73R2ATTD4022F25, RT0805FRD0740K2L) have wider acceptable value ranges than ±0.1% parts. Mixing different tolerance specifications in the same circuit is permissible only if circuit design tolerates the combined tolerance stack-up. For precision analog circuits, consistent tolerance specifications across all resistors are recommended.

Q7: What does "current sense" designation mean for CRT0805-BY-4022ELF?

A: Current sense resistors are precision thin film components designed for accurate current measurement in power management and monitoring circuits. CRT0805-BY-4022ELF maintains ±0.1% tolerance and ±25ppm/°C temperature coefficient, providing stable performance for current measurement applications. This part is suitable for circuits requiring precision current monitoring in addition to standard resistive functions.

Q8: Why does MCU08050D4022BP100 have a lower maximum operating temperature (125°C vs. 155°C)?

A: MCU08050D4022BP100 is specified with -55°C to 125°C operating range, compared to -55°C to 155°C for other parts. This part is suitable for applications with maximum operating temperature not exceeding 125°C. For designs requiring operation to 155°C, select alternative parts with extended temperature range.

Q9: What is the advantage of anti-sulfur coating in YAGEO AT series parts?

A: Anti-sulfur coating protects resistor elements from sulfur contamination in harsh environments, extending component reliability and lifespan. AT0805BRD0740K2L, AT0805CRD0740K2L, and AT0805DRD0740K2L include this feature along with Automotive AEC-Q200 qualification and moisture resistance, making them suitable for automotive and industrial applications.

Q10: Is inventory availability a factor in part selection?

A: Inventory levels provided indicate current stock status. ERA-6AEB4022V (Panasonic) shows highest inventory (15,814 pcs), followed by 5-2176093-8 (TE Connectivity, 1,797 pcs). For long-term supply chain planning, parts with active product status and established manufacturer support are recommended regardless of current inventory levels.

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