RC2012F1211CS Equivalent & Substitute Parts Reference

Part Overview

The RC2012F1211CS is a 1.21 kOhm ±1% 0.125W thick film chip resistor manufactured by Samsung Electro-Mechanics in 0805 (2012 Metric) package format. This component is classified as Active product status with 1,068 pieces currently in stock. The RC2012F1211CS serves as a precision resistor for general-purpose circuit applications requiring moisture resistance and stable performance across the -55°C to 155°C operating temperature range. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and application-specific feature options such as automotive AEC-Q200 qualification or enhanced power ratings.

Key Parameters

Parameter	Value
Resistance	1.21 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
Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RC2012F1211CS are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes maintain identical electrical specifications (1.21 kOhms, ±1% tolerance, 0.125W power rating, ±100ppm/°C temperature coefficient, -55°C to 155°C operating range) and mechanical package (0805 / 2012 Metric). These parts differ only in manufacturer, series designation, and minor physical dimensions (height variation of 0.020" to 0.028"). Direct substitutes include CR0805-FX-1211ELF (Bourns), ERJ-6ENF1211V (Panasonic), RC0805FR-071K21L (YAGEO), and RMCF0805FT1K21 (Stackpole).

Similar Substitutes maintain the same electrical specifications and package but introduce additional features or certifications. AC0805FR-071K21L and CRCW08051K21FKEA add AEC-Q200 automotive qualification. CRCW08051K21FKEAHP and RCS08051K21FKEA increase power rating to 0.5W (1/2W) while maintaining the 0805 package and AEC-Q200 certification. MCR10ERTF1211 (Rohm) is discontinued at DiGi Electronics but remains functionally equivalent.

Substitution eligibility is determined by:

Resistance value: 1.21 kOhms (exact match required)
Tolerance: ±1% (exact match required)
Package: 0805 (2012 Metric) (exact match required)
Temperature coefficient: ±100ppm/°C (exact match required)
Operating temperature: -55°C ~ 155°C (exact match required)
Composition: Thick Film (exact match required)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	Height Max (in)	Features	Product Status	RoHS
RC2012F1211CS	Samsung Electro-Mechanics	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.026	Moisture Resistant	Active	ROHS3
CR0805-FX-1211ELF	Bourns Inc.	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.024	Moisture Resistant	Active	ROHS3
ERJ-6ENF1211V	Panasonic Electronic Components	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.028	Automotive AEC-Q200	Active	ROHS3
RC0805FR-071K21L	YAGEO	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.024	Moisture Resistant	Active	ROHS3
RMCF0805FT1K21	Stackpole Electronics Inc	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.026	Automotive AEC-Q200	Active	ROHS3
AC0805FR-071K21L	YAGEO	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.024	Automotive AEC-Q200, Moisture Resistant	Active	ROHS3
CRCW08051K21FKEA	Vishay Dale	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.020	Automotive AEC-Q200	Active	ROHS3
CRCW08051K21FKEAHP	Vishay Dale	1.21 kΩ	±1%	0.5	0805	±100ppm/°C	-55~155°C	0.020	Automotive AEC-Q200, Pulse Withstanding	Active	ROHS3
CRCW08051K21FKTA	Vishay Dale	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.020	Automotive AEC-Q200	Active	RoHS non-compliant
MCR10ERTF1211	Rohm Semiconductor	1.21 kΩ	±1%	0.125	0805	±100ppm/°C	-55~155°C	0.026	—	Discontinued	ROHS3
RCS08051K21FKEA	Vishay Dale	1.21 kΩ	±1%	0.5	0805	±100ppm/°C	-55~155°C	0.020	Automotive AEC-Q200, Pulse Withstanding	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

CR0805-FX-1211ELF (Bourns), RC0805FR-071K21L (YAGEO), and RMCF0805FT1K21 (Stackpole) are functionally equivalent to RC2012F1211CS with all electrical and mechanical parameters matching. All three are Active status products with ROHS3 compliance. Selection among these direct substitutes depends on supply availability and inventory levels. Bourns CR0805-FX-1211ELF offers 49,944 pieces in stock. YAGEO RC0805FR-071K21L provides the highest inventory at 337,239 pieces. Stackpole RMCF0805FT1K21 stocks 229,411 pieces.

For Automotive Applications:

ERJ-6ENF1211V (Panasonic), RMCF0805FT1K21 (Stackpole), AC0805FR-071K21L (YAGEO), CRCW08051K21FKEA (Vishay Dale), and RCS08051K21FKEA (Vishay Dale) carry AEC-Q200 automotive qualification. These parts are suitable for automotive circuit designs requiring industry-standard reliability ratings. All maintain identical electrical specifications to RC2012F1211CS.

For Enhanced Power Dissipation:

CRCW08051K21FKEAHP (Vishay Dale) and RCS08051K21FKEA (Vishay Dale) increase power rating to 0.5W (1/2W) while maintaining the 0805 package footprint and AEC-Q200 certification. These parts are selected when circuit design requires higher power dissipation capability within the same physical package constraints.

Compliance Considerations:

CRCW08051K21FKTA (Vishay Dale) is RoHS non-compliant and REACH Affected. This part is not recommended for new designs or applications requiring regulatory compliance. MCR10ERTF1211 (Rohm) is discontinued at DiGi Electronics and should not be selected for new production designs.

Recommended Primary Substitutes (Active, ROHS3 Compliant):

RC0805FR-071K21L (YAGEO) — highest inventory availability
RMCF0805FT1K21 (Stackpole) — AEC-Q200 qualified, high inventory
CR0805-FX-1211ELF (Bourns) — established manufacturer, active status

Frequently Asked Questions (FAQ)

Q: Can RC0805FR-071K21L replace RC2012F1211CS directly?

A: Yes. RC0805FR-071K21L (YAGEO) is a direct substitute with identical resistance (1.21 kOhms), tolerance (±1%), power rating (0.125W), package (0805), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C to 155°C). Physical height differs by 0.002 inches (0.60mm vs. 0.65mm), which does not affect PCB assembly compatibility.

Q: What is the difference between direct substitutes and similar substitutes?

A: Direct substitutes maintain all electrical and mechanical specifications identical to RC2012F1211CS. Similar substitutes add features such as AEC-Q200 automotive certification or increased power rating (0.5W instead of 0.125W) while preserving the core electrical parameters and 0805 package format.

Q: Are AEC-Q200 qualified parts (ERJ-6ENF1211V, RMCF0805FT1K21) suitable for non-automotive applications?

A: Yes. AEC-Q200 qualification indicates enhanced reliability testing and quality standards. These parts exceed standard requirements and are fully compatible with general-purpose circuit applications. AEC-Q200 parts can be used as direct replacements in any application where standard parts are specified.

Q: Can CRCW08051K21FKEAHP (0.5W) be used in place of RC2012F1211CS (0.125W)?

A: CRCW08051K21FKEAHP is electrically compatible (same resistance, tolerance, temperature coefficient, operating range) and physically compatible (0805 package). The higher power rating (0.5W vs. 0.125W) provides additional thermal margin and does not create incompatibility. However, circuit design must account for the different power dissipation capability. Use CRCW08051K21FKEAHP only when the application requires or benefits from the increased power rating.

Q: Why is CRCW08051K21FKTA not recommended?

A: CRCW08051K21FKTA is RoHS non-compliant and REACH Affected. These regulatory status indicators restrict use in applications subject to environmental compliance requirements. New designs should select ROHS3 compliant alternatives.

Q: What is the significance of package height variation (0.020" to 0.028")?

A: Package height variation among substitutes (ranging from 0.020 inches to 0.028 inches maximum seated height) does not affect PCB assembly compatibility. All parts use the same 0805 (2012 Metric) footprint. Height differences are within standard manufacturing tolerances and do not impact solder reflow, component placement, or circuit performance.

Q: Is MCR10ERTF1211 available for new designs?

A: MCR10ERTF1211 (Rohm Semiconductor) is discontinued at DiGi Electronics and should not be selected for new production designs. Alternative active-status substitutes with equivalent specifications are available from Bourns, YAGEO, Panasonic, Stackpole, and Vishay Dale.

Q: How do I verify substitute part compatibility before design implementation?

A: Verify that the substitute part matches all critical parameters: resistance value (1.21 kOhms), tolerance (±1%), power rating (0.125W minimum), package (0805), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C to 155°C). Cross-reference the substitute part number in the manufacturer datasheet to confirm these specifications. Confirm product status is Active and compliance requirements (RoHS, REACH) align with application requirements.

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