RMCS1206FT40K2 Equivalent & Substitute Parts

Part Overview

The RMCS1206FT40K2 is a 40.2 kOhms ±1% 0.25W thick film chip resistor in 1206 (3216 Metric) package manufactured by Stackpole Electronics Inc. This anti-sulfur resistor operates across -55°C to 155°C and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements call for enhanced features such as automotive qualification or increased power ratings while maintaining electrical equivalence.

Key Parameters

Parameter	Value
Resistance	40.2 kOhms
Tolerance	±1%
Power Rating	0.25W (1/4W)
Package	1206 (3216 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 strict electrical and mechanical parameter matching:

Primary Substitution Criteria:

Resistance value: 40.2 kOhms (exact match required)
Tolerance: ±1% (exact match required)
Package: 1206 (3216 Metric) (exact match required)
Composition: Thick Film (exact match required)
Temperature Coefficient: ±100ppm/°C (exact match required)
Operating Temperature Range: -55°C ~ 155°C (exact match required)

Secondary Considerations:

Power rating: 0.25W minimum (higher ratings acceptable for drop-in replacement)
RoHS compliance: ROHS3 (maintained across all substitutes)
Moisture Sensitivity Level: 1 (maintained across all substitutes)

All listed substitute parts meet these criteria. Variations exist in manufacturer-specific features (automotive AEC-Q200 qualification, pulse withstanding capability, moisture resistance enhancements) and physical dimensions within the 1206 package specification.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Operating Temp	Features	Product Status
RMCS1206FT40K2	Stackpole Electronics Inc	40.2 kOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur	Active
RMCF1206FT40K2	Stackpole Electronics Inc	40.2 kOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active
CR1206-FX-4022ELF	Bourns Inc.	40.2 kOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active
CRCW120640K2FKEA	Vishay Dale	40.2 kOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active
CRCW120640K2FKEAHP	Vishay Dale	40.2 kOhms	±1%	0.75	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Pulse Withstanding	Active
ERJ-8ENF4022V	Panasonic Electronic Components	40.2 kOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Not For New Designs
RC1206FR-0740K2L	YAGEO	40.2 kOhms	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active

Engineering Selection Recommendations

For General Applications (Active Status Required): RMCF1206FT40K2, CR1206-FX-4022ELF, CRCW120640K2FKEA, and RC1206FR-0740K2L are all active products with full production support. Selection among these depends on supply availability and specific feature requirements.

For Automotive Applications: RMCF1206FT40K2, CRCW120640K2FKEA, and CRCW120640K2FKEAHP carry AEC-Q200 automotive qualification. CRCW120640K2FKEAHP provides increased power rating (0.75W) with pulse withstanding capability for demanding automotive circuits.

For Moisture-Sensitive Environments: CR1206-FX-4022ELF and RC1206FR-0740K2L feature explicit moisture resistance enhancements beyond standard MSL 1 rating.

Avoid for New Designs: ERJ-8ENF4022V carries "Not For New Designs" status and should be used only for legacy system maintenance or repair.

Frequently Asked Questions (FAQ)

Q: Can CRCW120640K2FKEAHP (0.75W) replace RMCS1206FT40K2 (0.25W)? A: Yes. The 0.75W rating exceeds the 0.25W requirement, providing additional thermal margin. All other electrical parameters (resistance, tolerance, temperature coefficient, operating range) are identical. Physical dimensions remain within 1206 package specification.

Q: What is the difference between anti-sulfur and moisture-resistant features? A: Anti-sulfur protection (RMCS1206FT40K2) targets sulfur contamination in industrial environments. Moisture-resistant variants (CR1206-FX-4022ELF, RC1206FR-0740K2L) provide enhanced protection against humidity. Both maintain MSL 1 rating. Feature selection depends on specific environmental exposure.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), matching the original part specifications.

Q: Why is ERJ-8ENF4022V marked "Not For New Designs"? A: This designation indicates the manufacturer has discontinued active development for this part. While electrically equivalent and currently in stock, it should not be selected for new product designs due to uncertain long-term availability.

Q: Do physical dimension variations within the 1206 package affect PCB layout? A: No. All parts conform to 1206 (3216 Metric) package specification. Minor variations in seated height (0.024" to 0.030") and length/width (within ±0.004") do not impact standard PCB footprint design or assembly processes.

Q: Which substitute offers the best supply availability? A: CRCW120640K2FKEAHP shows the highest inventory (53,999 pcs), followed by RMCF1206FT40K2 (65,595 pcs). Verify current availability with your supplier, as inventory levels change continuously.

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