RCS2012F4992CS Equivalent & Substitute Parts

Part Overview

The RCS2012F4992CS is a 49.9 kOhms ±1% 0.125W (1/8W) thick film chip resistor in 0805 (2012 Metric) package manufactured by Samsung Electro-Mechanics. This component is classified as Active product status with anti-sulfur and moisture-resistant properties. The part is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating.

Substitute parts are identified when equivalent electrical specifications, mechanical dimensions, and compliance certifications align with the original component, enabling direct replacement in circuit applications without performance degradation.

Key Parameters

Parameter	Value
Resistance	49.9 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
Size / Dimension	0.079" L x 0.049" W (2.00mm x 1.25mm)
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of the following critical parameters:

Electrical Specifications:

Resistance value: 49.9 kOhms
Tolerance: ±1%
Power rating: 0.125W (1/8W)
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C ~ 155°C

Mechanical Specifications:

Package type: 0805 (2012 Metric)
Physical dimensions: 0.079" L x 0.049" W (2.00mm x 1.25mm)
Termination count: 2

Compliance & Environmental:

RoHS3 compliance
MSL 1 (Unlimited) rating
Thick film composition

Substitute parts are grouped into two categories based on power rating alignment:

Category A - Direct Equivalents (0.125W / 1/8W): Parts with identical power rating to the main component.

Category B - Higher Power Rating (0.5W / 1/2W): Parts with increased power dissipation capability, suitable for applications requiring additional thermal margin.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Temp Coeff	Op Temp Range	Height Max	RoHS Status	MSL	Packaging Type
RCS2012F4992CS	Samsung Electro-Mechanics	49.9 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.026" (0.66mm)	ROHS3	1	Tape & Reel
AC0805FR-0749K9L	YAGEO	49.9 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024" (0.60mm)	ROHS3	1	Tape & Reel
CRCW080549K9FKEA	Vishay Dale	49.9 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.020" (0.50mm)	ROHS3	1	Tape & Reel
CRCW080549K9FKEAHP	Vishay Dale	49.9 kOhms	±1%	0.5W	0805	±100ppm/°C	-55°C ~ 155°C	0.020" (0.50mm)	ROHS3	1	Tape & Reel
CRCW080549K9FKTA	Vishay Dale	49.9 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.020" (0.50mm)	RoHS non-compliant	1	Tape & Reel
ERJ-6ENF4992V	Panasonic Electronic Components	49.9 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.028" (0.70mm)	ROHS3	1	Cut Tape & Digi-Reel
RC0805FR-0749K9L	YAGEO	49.9 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024" (0.60mm)	ROHS3	1	Cut Tape & Digi-Reel
RCS080549K9FKEA	Vishay Dale	49.9 kOhms	±1%	0.5W	0805	±100ppm/°C	-55°C ~ 155°C	0.020" (0.50mm)	ROHS3	1	Tape & Reel
RMCF0805FT49K9	Stackpole Electronics Inc	49.9 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.026" (0.65mm)	ROHS3	1	Tape & Reel

Engineering Selection Recommendations

Primary Substitutes (Full Compliance Equivalents):

The following parts meet all electrical, mechanical, and compliance requirements identical to RCS2012F4992CS:

AC0805FR-0749K9L (YAGEO): ROHS3 compliant, AEC-Q200 rated, 33,270 units in stock
CRCW080549K9FKEA (Vishay Dale): ROHS3 compliant, AEC-Q200 rated, 128,837 units in stock
ERJ-6ENF4992V (Panasonic): ROHS3 compliant, AEC-Q200 rated, 129,423 units in stock
RC0805FR-0749K9L (YAGEO): ROHS3 compliant, 2,745,332 units in stock
RMCF0805FT49K9 (Stackpole Electronics): ROHS3 compliant, AEC-Q200 rated, 351,923 units in stock

Secondary Substitutes (Higher Power Rating):

The following parts provide increased power dissipation (0.5W vs 0.125W) while maintaining all other specifications:

CRCW080549K9FKEAHP (Vishay Dale): ROHS3 compliant, AEC-Q200 rated, pulse withstanding capability, 14,954 units in stock
RCS080549K9FKEA (Vishay Dale): ROHS3 compliant, AEC-Q200 rated, pulse withstanding capability, 10,632 units in stock

Non-Recommended Substitute:

CRCW080549K9FKTA (Vishay Dale): RoHS non-compliant and REACH affected; use only in applications where RoHS3 compliance is not required

Selection Criteria:

For applications requiring ROHS3 compliance and standard 0.125W power rating, AC0805FR-0749K9L, CRCW080549K9FKEA, ERJ-6ENF4992V, RC0805FR-0749K9L, and RMCF0805FT49K9 are functionally equivalent. Selection among these should be based on packaging preference (Tape & Reel vs Cut Tape & Digi-Reel), inventory availability, and supply chain considerations.

For applications requiring thermal margin or pulse withstanding capability, CRCW080549K9FKEAHP and RCS080549K9FKEA provide 0.5W power rating while maintaining ROHS3 compliance and AEC-Q200 automotive qualification.

Frequently Asked Questions (FAQ)

Q: Can CRCW080549K9FKEAHP (0.5W) be used as a direct replacement for RCS2012F4992CS (0.125W)?

A: Yes. The 0.5W part is electrically and mechanically compatible. The higher power rating provides additional thermal margin and does not degrade circuit performance. The physical dimensions remain identical (0805 package, 2.00mm x 1.25mm), ensuring PCB layout compatibility.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging?

A: Tape & Reel packaging is supplied on continuous carrier tape in reel format, suitable for high-volume automated assembly. Cut Tape & Digi-Reel packaging is supplied in shorter tape segments or alternative reel formats. Both formats contain identical components; packaging selection depends on assembly equipment and order quantity requirements.

Q: Why is CRCW080549K9FKTA not recommended?

A: CRCW080549K9FKTA is RoHS non-compliant and REACH affected. It should only be used in applications where RoHS3 compliance is not a requirement. For new designs or applications requiring regulatory compliance, use ROHS3-compliant alternatives.

Q: Are all substitute parts AEC-Q200 qualified?

A: Most substitute parts carry AEC-Q200 automotive qualification (AC0805FR-0749K9L, CRCW080549K9FKEA, CRCW080549K9FKEAHP, ERJ-6ENF4992V, RMCF0805FT49K9, RCS080549K9FKEA). RC0805FR-0749K9L does not list AEC-Q200 qualification. Verify AEC-Q200 requirement for your specific application before selection.

Q: What does MSL 1 (Unlimited) mean?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture-controlled storage or handling. All listed parts carry this rating, eliminating moisture sensitivity concerns during storage and assembly.

Q: Can I substitute based on resistance value alone?

A: No. Substitution requires alignment of resistance value (49.9 kOhms), tolerance (±1%), power rating (0.125W or higher), package type (0805), temperature coefficient (±100ppm/°C), operating temperature range (-55°C ~ 155°C), and compliance status (ROHS3). All parameters must match or exceed the original specification.

Q: What is the significance of temperature coefficient ±100ppm/°C?

A: Temperature coefficient defines resistance change per degree Celsius. All listed parts maintain ±100ppm/°C, ensuring consistent performance across the -55°C ~ 155°C operating range. This parameter must remain constant for direct substitution in precision applications.

Q: Are there inventory considerations for part selection?

A: Yes. RC0805FR-0749K9L has the highest inventory (2,745,332 units), followed by ERJ-6ENF4992V (129,423 units) and CRCW080549K9FKEA (128,837 units). For applications with extended lead time requirements, parts with higher inventory levels provide supply chain security.

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