RMCS0805FT40K2 Equivalent & Substitute Parts

Part Overview

The RMCS0805FT40K2 is a 40.2 kOhms ±1% 0.125W (1/8W) chip resistor in 0805 (2012 Metric) package manufactured by Stackpole Electronics Inc. This thick film resistor features anti-sulfur construction and operates across -55°C to 155°C. The part is active and in stock with 1106 units available. Equivalent and substitute parts are identified to support procurement flexibility, design optimization, and supply chain continuity.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: resistance value (40.2 kOhms), tolerance (±1%), package type (0805), composition (thick film), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C ~ 155°C). Parts are grouped into two categories based on power rating compatibility:

Category 1: 0.125W (1/8W) Rating — Direct electrical and mechanical equivalents with identical power dissipation capability. These parts maintain the same thermal and electrical performance envelope as the main part.

Category 2: 0.5W (1/2W) Rating — Higher power rating substitutes. These parts exceed the original power specification and are suitable for applications requiring enhanced thermal margin or pulse withstanding capability. Selection depends on circuit board layout constraints and thermal management requirements.

Additional differentiation includes automotive AEC-Q200 certification, moisture resistance features, and packaging format (Tape & Reel vs. Cut Tape & Digi-Reel).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Temperature Coefficient	Operating Temperature	Features	RoHS Status	Height - Seated (Max)
RMCS0805FT40K2	Stackpole Electronics Inc	40.2 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur	ROHS3 Compliant	0.024" (0.60mm)
RMCF0805FT40K2	Stackpole Electronics Inc	40.2 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3 Compliant	0.026" (0.65mm)
AC0805FR-0740K2L	YAGEO	40.2 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Moisture Resistant	ROHS3 Compliant	0.024" (0.60mm)
CRCW080540K2FKEA	Vishay Dale	40.2 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3 Compliant	0.020" (0.50mm)
CRCW080540K2FKEAHP	Vishay Dale	40.2 kOhms	±1%	0.5W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Pulse Withstanding	ROHS3 Compliant	0.020" (0.50mm)
CRCW080540K2FKTA	Vishay Dale	40.2 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	RoHS non-compliant	0.020" (0.50mm)
ERJ-6ENF4022V	Panasonic Electronic Components	40.2 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3 Compliant	0.028" (0.70mm)
RC0805FR-0740K2L	YAGEO	40.2 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	ROHS3 Compliant	0.024" (0.60mm)
RCS080540K2FKEA	Vishay Dale	40.2 kOhms	±1%	0.5W	0805	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Pulse Withstanding	ROHS3 Compliant	0.020" (0.50mm)

Engineering Selection Recommendations

For ROHS3 Compliant Applications: RMCF0805FT40K2, AC0805FR-0740K2L, CRCW080540K2FKEA, ERJ-6ENF4022V, RC0805FR-0740K2L, and RCS080540K2FKEA are all ROHS3 compliant and suitable for applications requiring environmental compliance.

For Automotive Applications: RMCF0805FT40K2, AC0805FR-0740K2L, CRCW080540K2FKEA, CRCW080540K2FKEAHP, CRCW080540K2FKTA, ERJ-6ENF4022V, and RCS080540K2FKEA carry AEC-Q200 automotive qualification.

For Moisture-Sensitive Environments: AC0805FR-0740K2L and RC0805FR-0740K2L feature moisture-resistant construction.

For Enhanced Thermal Performance: CRCW080540K2FKEAHP and RCS080540K2FKEA provide 0.5W (1/2W) power rating with pulse withstanding capability, suitable for circuits requiring higher thermal margin.

For Non-Compliant Legacy Designs: CRCW080540K2FKTA is available for applications not subject to RoHS requirements, though ROHS3 compliant alternatives are preferred for new designs.

For Space-Constrained Layouts: CRCW080540K2FKEA and RCS080540K2FKEA offer the lowest seated height at 0.020" (0.50mm).

Frequently Asked Questions (FAQ)

Q: Can I substitute RMCS0805FT40K2 with any of the listed parts?

A: Yes, all listed parts match the critical electrical parameters: 40.2 kOhms resistance, ±1% tolerance, 0.125W or higher power rating, 0805 package, ±100ppm/°C temperature coefficient, and -55°C to 155°C operating range. Selection depends on compliance requirements, feature needs, and physical constraints.

Q: What is the difference between 0.125W and 0.5W rated parts?

A: The 0.125W parts (RMCS0805FT40K2, RMCF0805FT40K2, AC0805FR-0740K2L, CRCW080540K2FKEA, ERJ-6ENF4022V, RC0805FR-0740K2L) dissipate lower power and are suitable for standard applications. The 0.5W parts (CRCW080540K2FKEAHP, RCS080540K2FKEA) provide higher thermal capacity and pulse withstanding capability for demanding circuits. Both are mechanically compatible in 0805 packages.

Q: Are there packaging format differences I should consider?

A: Yes. RMCS0805FT40K2, AC0805FR-0740K2L, CRCW080540K2FKEA, CRCW080540K2FKEAHP, CRCW080540K2FKTA, and RCS080540K2FKEA are supplied in Tape & Reel (TR) format. RMCF0805FT40K2, ERJ-6ENF4022V, and RC0805FR-0740K2L are supplied in Cut Tape (CT) & Digi-Reel format. Verify your assembly equipment compatibility before selection.

Q: Which substitute offers the best compliance profile?

A: RMCF0805FT40K2, AC0805FR-0740K2L, CRCW080540K2FKEA, ERJ-6ENF4022V, RC0805FR-0740K2L, and RCS080540K2FKEA all meet ROHS3 compliance and REACH unaffected status. AC0805FR-0740K2L and RC0805FR-0740K2L additionally feature moisture-resistant construction.

Q: What is the seated height consideration for PCB layout?

A: Seated heights range from 0.020" (0.50mm) for Vishay Dale CRCW and RCS series to 0.028" (0.70mm) for Panasonic ERJ-6ENF4022V. Verify your PCB clearance requirements and select accordingly. Lower profile parts may be preferred for space-constrained designs.

Q: Is CRCW080540K2FKTA suitable for new designs?

A: CRCW080540K2FKTA is RoHS non-compliant and REACH affected. It is suitable only for legacy applications or designs not subject to environmental regulations. For new designs, select from the ROHS3 compliant alternatives.

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