RN732ATTD40R2D100 Equivalent & Substitute Parts

Part Overview

The RN732ATTD40R2D100 is a 40.2 Ohm ±0.5% thin film chip resistor manufactured by KOA Speer Electronics, Inc., specified for 0.1W (1/10W) power dissipation in 0805 (2012 Metric) surface mount package. This part is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The RN732ATTD40R2D100 features moisture-resistant construction, operates across -55°C to 155°C, and maintains a temperature coefficient of ±100ppm/°C. Current inventory availability is 652 pieces in new original condition.

Substitute parts are identified based on electrical parameter compatibility (resistance value, tolerance, power rating) and mechanical compatibility (package dimensions, termination type). Active production alternatives with enhanced specifications or automotive qualification are available.

Key Parameters

Parameter	Value	Specification Basis
Resistance	40.2 Ohms	Exact match required
Tolerance	±0.5%	Exact match required
Power Rating	0.1W (1/10W)	Minimum acceptable; higher ratings acceptable
Package / Case	0805 (2012 Metric)	Exact match required
Composition	Thin Film	Exact match required
Operating Temperature Range	-55°C to 155°C	Minimum acceptable
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Exact match required
RoHS Status	ROHS3 Compliant	Exact match required
Packaging	Tape & Reel (TR)	Standard format

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on power rating and product status:

Category 1: Direct Upgrade (Same Resistance, Higher Power Rating, Active Status) Parts with 0.125W (1/8W) or 0.25W (1/4W) power ratings provide enhanced thermal margin while maintaining identical electrical characteristics (40.2 Ohms ±0.5%). These parts are suitable for direct substitution in applications where the original 0.1W rating is adequate, as higher power ratings do not degrade performance in lower-power applications.

Category 2: Same Power Rating (0.1W), Active Status The RR1220Q-40R2-D-M maintains the original 0.1W specification with active production status and improved availability (11,241 pieces in stock).

Substitution Criteria:

Resistance: 40.2 Ohms (exact)
Tolerance: ±0.5% (exact)
Package: 0805 (2012 Metric) (exact)
Composition: Thin Film (exact)
Power Rating: ≥0.1W (equal or higher acceptable)
Operating Temperature: ≥-55°C to 155°C (equal or wider acceptable)
MSL: 1 (Unlimited) (exact)
RoHS: ROHS3 Compliant (exact)

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff (ppm/°C)	Operating Temp (°C)	Product Status	Inventory (Pcs)
RN732ATTD40R2D100	KOA Speer	40.2 Ω	±0.5%	0.1	±100	-55 to 155	Obsolete	652
RN73R2ATTD40R2D100	KOA Speer	40.2 Ω	±0.5%	0.125	±100	-55 to 155	Active	718
AT0805DRD0740R2L	YAGEO	40.2 Ω	±0.5%	0.125	±25	-55 to 155	Active	1,131
AT0805DRE0740R2L	YAGEO	40.2 Ω	±0.5%	0.125	±50	-55 to 155	Active	879
RG2012Q-40R2-D-T5	Susumu	40.2 Ω	±0.5%	0.125	±50	-55 to 155	Active	965
RNCF0805DKE40R2	Stackpole	40.2 Ω	±0.5%	0.25	±25	-55 to 155	Active	785
RNCF0805DTC40R2	Stackpole	40.2 Ω	±0.5%	0.25	±50	-55 to 155	Active	763
RNCF0805DTE40R2	Stackpole	40.2 Ω	±0.5%	0.25	±25	-55 to 155	Active	948
RR1220Q-40R2-D-M	Susumu	40.2 Ω	±0.5%	0.1	±50	-55 to 125	Active	11,241
RT0805DRD0740R2L	YAGEO	40.2 Ω	±0.5%	0.125	±25	-55 to 155	Active	1,087
RT0805DRE0740R2L	YAGEO	40.2 Ω	±0.5%	0.125	±50	-55 to 155	Active	10,450

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Discontinuation):

Select from active production parts maintaining identical electrical specifications. The RN73R2ATTD40R2D100 (KOA Speer, 0.125W) provides the closest functional equivalent with enhanced power rating and active manufacturing status. This part is ROHS3 compliant, AEC-Q200 qualified, and maintains the same operating temperature range (-55°C to 155°C).

For Enhanced Thermal Performance:

The RNCF0805DTE40R2 (Stackpole Electronics, 0.25W) or RNCF0805DKE40R2 (Stackpole Electronics, 0.25W) offer doubled power dissipation capacity. Both are AEC-Q200 qualified, ROHS3 compliant, and suitable for applications requiring improved thermal margin. Temperature coefficient of ±25ppm/°C provides superior stability.

For Maximum Availability:

The RT0805DRE0740R2L (YAGEO, 0.125W) offers the highest inventory level (10,450 pieces) among 0.125W alternatives. This part maintains full compliance with ROHS3 and operating temperature specifications.

For Equivalent Power Rating (0.1W):

The RR1220Q-40R2-D-M (Susumu, 0.1W) maintains the original power specification with significantly higher inventory availability (11,241 pieces). Operating temperature range is -55°C to 125°C, which is acceptable for applications not requiring the full 155°C upper limit of the original part.

All substitute parts are ROHS3 compliant, MSL 1 (Unlimited), and packaged in Tape & Reel format. Selection should be based on application thermal requirements, temperature range constraints, and AEC-Q200 qualification necessity.

Frequently Asked Questions (FAQ)

Q: Can I use a 0.125W or 0.25W rated resistor in place of the 0.1W RN732ATTD40R2D100?

A: Yes. Higher power ratings are acceptable substitutes. A resistor with higher power dissipation capacity operates within its thermal limits when used in an application designed for lower power. The electrical characteristics (resistance, tolerance, temperature coefficient) remain the same. Physical dimensions remain identical within the 0805 package specification.

Q: What is the difference between the YAGEO AT and RT series parts?

A: Both AT and RT series parts are 0805 thin film resistors with 40.2 Ohm ±0.5% specifications. The AT series includes anti-sulfur and automotive AEC-Q200 features. The RT series provides standard thin film construction. Both maintain identical package dimensions and operating temperature ranges. Selection depends on environmental exposure requirements and automotive qualification necessity.

Q: Why does the RR1220Q-40R2-D-M have a lower maximum operating temperature (125°C vs. 155°C)?

A: The RR1220Q-40R2-D-M is specified for -55°C to 125°C operation. Applications requiring operation above 125°C must use alternative parts with -55°C to 155°C ratings. For applications with maximum operating temperature at or below 125°C, this part is fully compatible and offers superior inventory availability.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the original RN732ATTD40R2D100 specification.

Q: What is the significance of temperature coefficient differences (±25ppm/°C vs. ±50ppm/°C vs. ±100ppm/°C)?

A: Temperature coefficient indicates resistance value drift across the operating temperature range. Lower values (±25ppm/°C) provide superior stability. The original part specifies ±100ppm/°C. Substitute parts with ±25ppm/°C or ±50ppm/°C offer improved temperature stability without affecting compatibility. Selection should be based on circuit tolerance requirements.

Q: Can I substitute the RN732ATTD40R2D100 with a different resistance value?

A: No. Substitutes must maintain exactly 40.2 Ohms ±0.5% resistance. Different resistance values are not compatible and will alter circuit performance.

Q: Are Stackpole RNCF series parts suitable for automotive applications?

A: Yes. The RNCF0805DKE40R2, RNCF0805DTC40R2, and RNCF0805DTE40R2 are all AEC-Q200 qualified, meeting automotive reliability standards. These parts are suitable for automotive and industrial applications requiring enhanced qualification.

Q: What is the difference between Tape & Reel packaging and other formats?

A: Tape & Reel (TR) is the standard surface mount component packaging format for automated assembly. All listed parts use this format, ensuring compatibility with standard pick-and-place equipment and reflow soldering processes.

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