RMCS0805FT40R2 Equivalent & Substitute Parts

Part Overview

The RMCS0805FT40R2 is a 40.2 Ohm ±1% 1/8W thick film chip resistor in 0805 (2012 Metric) package manufactured by Stackpole Electronics Inc. This anti-sulfur resistor is currently active in production with 888 pieces in stock. Substitute parts are necessary to address supply chain flexibility, application-specific requirements such as automotive qualification, enhanced power ratings, or moisture resistance features that may be required for specific circuit implementations.

Key Parameters

Parameter	Value
Resistance	40.2 Ohms
Tolerance	±1%
Power Rating	0.125W (1/8W)
Package	0805 (2012 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the RMCS0805FT40R2 is determined by the following core parameters:

Resistance Value: Must be 40.2 Ohms
Tolerance: Must be ±1%
Package: Must be 0805 (2012 Metric)
Composition: Must be Thick Film
Temperature Coefficient: Must be ±100ppm/°C
Operating Temperature Range: Must be -55°C to 155°C
Termination Count: Must be 2

All substitute parts listed meet these core electrical and mechanical requirements. Variations in power rating, special features (automotive qualification, pulse withstanding, moisture resistance), and physical height are secondary parameters that define specific use cases but do not prevent substitution when the core parameters align.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power Rating	Package	Temp Coeff	Operating Temp	Features	Height (Max)
RMCS0805FT40R2	Stackpole Electronics Inc	40.2 Ω	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur	0.024" (0.60mm)
RMCF0805FT40R2	Stackpole Electronics Inc	40.2 Ω	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	0.026" (0.65mm)
CRCW080540R2FKEA	Vishay Dale	40.2 Ω	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	0.020" (0.50mm)
ERJ-6ENF40R2V	Panasonic Electronic Components	40.2 Ω	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	0.028" (0.70mm)
ERJ-P06F40R2V	Panasonic Electronic Components	40.2 Ω	±1%	0.5W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Pulse Withstanding	0.028" (0.70mm)
RC0805FR-0740R2L	YAGEO	40.2 Ω	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	0.024" (0.60mm)

Engineering Selection Recommendations

Direct Equivalent (Same Specifications)

RMCF0805FT40R2 and RC0805FR-0740R2L are direct equivalents with identical electrical specifications to the RMCS0805FT40R2. RMCF0805FT40R2 adds automotive AEC-Q200 qualification. RC0805FR-0740R2L adds moisture resistance. Both are ROHS3 compliant with MSL 1 rating.

Automotive-Qualified Alternatives

CRCW080540R2FKEA (Vishay Dale) and ERJ-6ENF40R2V (Panasonic) both provide AEC-Q200 automotive qualification with identical electrical parameters. CRCW080540R2FKEA offers the lowest maximum height at 0.020". ERJ-6ENF40R2V is available in higher inventory volume (126,012 pieces).

Enhanced Power Rating Option

ERJ-P06F40R2V provides a 0.5W power rating (4× the standard 0.125W) while maintaining all other electrical specifications. This part is suitable for applications requiring higher pulse withstanding capability and thermal margin. AEC-Q200 qualified.

Compliance Status

All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity level) rating, matching the original part's environmental compliance profile.

Frequently Asked Questions (FAQ)

Q: Can I substitute RMCS0805FT40R2 with any of these parts directly?

A: Yes, all listed parts meet the core electrical and mechanical requirements (40.2 Ω, ±1%, 0805 package, thick film, ±100ppm/°C, -55°C to 155°C). Physical height variations are minor and typically do not affect PCB layout compatibility for standard 0805 footprints.

Q: What is the difference between the anti-sulfur feature of RMCS0805FT40R2 and the moisture-resistant feature of RC0805FR-0740R2L?

A: Anti-sulfur protection targets sulfur contamination in high-sulfur environments. Moisture resistance targets humidity and moisture ingress. These are distinct environmental protection mechanisms. Selection depends on the specific environmental exposure of the application.

Q: Should I use ERJ-P06F40R2V if my circuit only requires 0.125W?

A: ERJ-P06F40R2V's 0.5W rating provides additional thermal margin and pulse withstanding capability. It is a valid substitute even for 0.125W applications, as higher power rating does not degrade performance in lower-power circuits. Use this part if supply of standard 0.125W variants is constrained.

Q: Are automotive-qualified parts (AEC-Q200) suitable for non-automotive applications?

A: Yes. AEC-Q200 qualification indicates enhanced reliability testing and stricter manufacturing controls. These parts are fully compatible with non-automotive applications and provide equivalent or superior performance.

Q: What is the significance of the height differences shown in the parameter table?

A: Height variations (0.020" to 0.028") are within standard 0805 package tolerances and do not affect electrical performance. Verify PCB clearance if the application has height-constrained assembly requirements (e.g., under-component routing, low-profile enclosures).

Q: Are all parts available in Tape & Reel packaging?

A: Yes, all listed parts are supplied in Tape & Reel (TR) packaging, suitable for automated assembly processes.

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