Equivalent & Substitute Parts for RMCS1206FT2K21

Part Overview

The RMCS1206FT2K21 is a 2.21 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 is unavailable, when design requirements demand automotive qualification, or when enhanced performance features such as pulse withstanding capability or moisture resistance are required.

Key Parameters

Parameter	Value
Resistance	2.21 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 to 155°C
Terminations	2
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: resistance value (2.21 kOhms), tolerance (±1%), package type (1206), composition (thick film), temperature coefficient (±100ppm/°C), operating temperature range (-55°C to 155°C), and termination count (2). All listed substitute parts meet these core electrical and mechanical requirements.

Substitute parts are grouped into three categories based on additional features:

Category 1: Standard Equivalents — Parts matching all core parameters without additional certifications or enhanced features.

Category 2: Automotive AEC-Q200 Qualified — Parts meeting automotive qualification standards, suitable for applications requiring automotive-grade reliability.

Category 3: Enhanced Performance — Parts with additional features such as pulse withstanding capability, moisture resistance, or higher power ratings while maintaining the 1206 package footprint.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Operating Temp	Features	Product Status	RoHS Status
RMCS1206FT2K21	Stackpole Electronics Inc	2.21 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Anti-Sulfur	Active	ROHS3
RMCF1206FT2K21	Stackpole Electronics Inc	2.21 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	ROHS3
AC1206FR-072K21L	YAGEO	2.21 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
CR1206-FX-2211ELF	Bourns Inc.	2.21 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	ROHS3
CRCW12062K21FKEA	Vishay Dale	2.21 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	ROHS3
CRCW12062K21FKEAHP	Vishay Dale	2.21 kΩ	±1%	0.75	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Pulse Withstanding	Active	ROHS3
CRCW12062K21FKTA	Vishay Dale	2.21 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active	RoHS Non-compliant
ERJ-8ENF2211V	Panasonic Electronic Components	2.21 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Not For New Designs	ROHS3
RC1206FR-072K21L	YAGEO	2.21 kΩ	±1%	0.25	1206	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Active Status, ROHS3 Compliant): RMCF1206FT2K21, AC1206FR-072K21L, CR1206-FX-2211ELF, CRCW12062K21FKEA, and RC1206FR-072K21L are all active products with ROHS3 compliance. RMCF1206FT2K21 from the same manufacturer (Stackpole) provides the closest functional equivalence with automotive AEC-Q200 qualification.

For Automotive Applications: RMCF1206FT2K21, AC1206FR-072K21L, CRCW12062K21FKEA, CRCW12062K21FKTA, and ERJ-8ENF2211V carry AEC-Q200 automotive qualification. CRCW12062K21FKEAHP offers enhanced pulse withstanding capability for demanding automotive environments, though at 0.75W power rating.

For Moisture-Sensitive Environments: AC1206FR-072K21L, CR1206-FX-2211ELF, and RC1206FR-072K21L include moisture-resistant features while maintaining standard electrical parameters.

Parts to Avoid for New Designs: ERJ-8ENF2211V carries "Not For New Designs" status. CRCW12062K21FKTA is RoHS non-compliant and REACH affected, making it unsuitable for applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can RMCF1206FT2K21 replace RMCS1206FT2K21 directly? A: Yes. Both parts share identical electrical specifications (2.21 kΩ, ±1%, 0.25W, 1206 package, ±100ppm/°C, -55°C to 155°C). RMCF1206FT2K21 adds automotive AEC-Q200 qualification and is from the same manufacturer, making it a direct functional equivalent.

Q: What is the difference between CRCW12062K21FKEA and CRCW12062K21FKEAHP? A: Both are Vishay Dale automotive AEC-Q200 qualified resistors in 1206 package with 2.21 kΩ resistance and ±1% tolerance. The primary difference is power rating: FKEA is rated 0.25W while FKEAHP is rated 0.75W and includes pulse withstanding capability. FKEAHP is suitable for applications requiring higher transient energy absorption.

Q: Are all substitute parts available in the same packaging? A: Most substitute parts are supplied in Tape & Reel (TR) packaging. CRCW12062K21FKTA is available in Cut Tape (CT) & Digi-Reel® packaging. Verify packaging requirements with your procurement specification before selection.

Q: Why is ERJ-8ENF2211V marked "Not For New Designs"? A: This designation indicates the part is in mature or end-of-life phase. While electrically equivalent and currently in stock, Panasonic recommends using alternative sources for new product development to ensure long-term supply continuity.

Q: Can I use CRCW12062K21FKTA as a substitute? A: CRCW12062K21FKTA is electrically equivalent but is RoHS non-compliant and REACH affected. Use only if your application does not require regulatory compliance with ROHS3 or REACH standards.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity? A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitute parts carry this rating, ensuring compatibility with standard manufacturing processes.

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