RCS2012F4990CS Equivalent & Substitute Parts

Part Overview

The RCS2012F4990CS is a 499 Ohm ±1% 0.125W (1/8W) thick film chip resistor manufactured by Samsung Electro-Mechanics in 0805 (2012 Metric) package format. This component is classified as Active product status with anti-sulfur and moisture-resistant construction. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and application-specific feature matching while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Resistance	499 Ohms
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
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution compatibility for the RCS2012F4990CS is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Resistance value: 499 Ohms (exact match required)
Tolerance: ±1% (exact match required)
Power rating: 0.125W (1/8W) minimum
Package: 0805 (2012 Metric) form factor
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C ~ 155°C minimum
Composition: Thick film construction
Terminations: 2-terminal configuration
MSL rating: 1 (Unlimited)

Substitution Categories:

Category A - Direct Electrical & Mechanical Equivalents (1/8W Rating): Parts with identical electrical specifications and 0805 package dimensions. These include CRCW0805499RFKTA, AC0805FR-07499RL, CRCW0805499RFKEA, ERJ-6ENF4990V, RC0805FR-07499RL, and RMCF0805FT499R. All maintain the 0.125W power rating and ±1% tolerance.

Category B - Higher Power Rating Substitutes (1/2W Rating): Parts with identical resistance and tolerance but elevated power rating of 0.5W (1/2W). These include CRCW0805499RFKEAHP and RCS0805499RFKEA. These components provide thermal margin in applications where power dissipation may approach rated limits.

All substitute parts maintain the 0805 package footprint, two-terminal configuration, and -55°C to 155°C operating temperature range.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Temp Coeff	Op Temp Range	Package	Height Max (mm)	RoHS Status	Features
RCS2012F4990CS	Samsung Electro-Mechanics	499 Ω	±1%	0.125	±100ppm/°C	-55 ~ 155°C	0805	0.66	ROHS3	Anti-Sulfur, Moisture Resistant
AC0805FR-07499RL	YAGEO	499 Ω	±1%	0.125	±100ppm/°C	-55 ~ 155°C	0805	0.60	ROHS3	Automotive AEC-Q200, Moisture Resistant
CRCW0805499RFKEA	Vishay Dale	499 Ω	±1%	0.125	±100ppm/°C	-55 ~ 155°C	0805	0.50	ROHS3	Automotive AEC-Q200
CRCW0805499RFKEAHP	Vishay Dale	499 Ω	±1%	0.5	±100ppm/°C	-55 ~ 155°C	0805	0.50	ROHS3	Automotive AEC-Q200, Pulse Withstanding
CRCW0805499RFKTA	Vishay Dale	499 Ω	±1%	0.125	±100ppm/°C	-55 ~ 155°C	0805	0.50	RoHS Non-compliant	Automotive AEC-Q200
ERJ-6ENF4990V	Panasonic Electronic Components	499 Ω	±1%	0.125	±100ppm/°C	-55 ~ 155°C	0805	0.70	ROHS3	Automotive AEC-Q200
RC0805FR-07499RL	YAGEO	499 Ω	±1%	0.125	±100ppm/°C	-55 ~ 155°C	0805	0.60	ROHS3	Moisture Resistant
RCS0805499RFKEA	Vishay Dale	499 Ω	±1%	0.5	±100ppm/°C	-55 ~ 155°C	0805	0.50	ROHS3	Automotive AEC-Q200, Pulse Withstanding
RMCF0805FT499R	Stackpole Electronics Inc	499 Ω	±1%	0.125	±100ppm/°C	-55 ~ 155°C	0805	0.65	ROHS3	Automotive AEC-Q200

Engineering Selection Recommendations

For Direct Replacement (Identical 1/8W Specification):

CRCW0805499RFKEA (Vishay Dale), AC0805FR-07499RL (YAGEO), ERJ-6ENF4990V (Panasonic), RC0805FR-07499RL (YAGEO), and RMCF0805FT499R (Stackpole) are electrically and mechanically equivalent to the RCS2012F4990CS. All maintain ROHS3 compliance, ±1% tolerance, 0.125W power rating, and -55°C to 155°C operating range. These parts are suitable for direct substitution in applications where the original specification is maintained.

For Automotive Applications:

AC0805FR-07499RL, CRCW0805499RFKEA, CRCW0805499RFKEAHP, ERJ-6ENF4990V, RCS0805499RFKEA, and RMCF0805FT499R carry AEC-Q200 automotive qualification. These parts are appropriate for automotive-grade circuit designs requiring enhanced reliability standards.

For Elevated Power Dissipation:

CRCW0805499RFKEAHP (Vishay Dale) and RCS0805499RFKEA (Vishay Dale) provide 0.5W (1/2W) power rating while maintaining the 0805 package footprint. These components are suitable for applications where thermal margin is required beyond the standard 0.125W specification.

Compliance Considerations:

CRCW0805499RFKTA (Vishay Dale) is RoHS non-compliant and REACH Affected. This part is not recommended for new designs or applications requiring regulatory compliance.

All ROHS3-compliant alternatives maintain REACH Unaffected status and are suitable for regulated applications.

Frequently Asked Questions (FAQ)

Q: Can CRCW0805499RFKEAHP (1/2W) be used in place of RCS2012F4990CS (1/8W)?

A: Yes. The CRCW0805499RFKEAHP maintains identical resistance (499 Ω), tolerance (±1%), temperature coefficient (±100ppm/°C), operating range (-55°C to 155°C), and 0805 package dimensions. The higher power rating (0.5W vs. 0.125W) provides additional thermal capacity and does not create incompatibility. The component will function correctly in circuits designed for the lower power rating.

Q: What is the difference between AC0805FR-07499RL and RC0805FR-07499RL?

A: Both are YAGEO 499 Ω ±1% 0.125W 0805 resistors with ROHS3 compliance. AC0805FR-07499RL includes Automotive AEC-Q200 qualification and moisture resistance. RC0805FR-07499RL includes moisture resistance but does not carry AEC-Q200 certification. Selection depends on automotive qualification requirements.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: No. CRCW0805499RFKEA and ERJ-6ENF4990V are supplied in Cut Tape (CT) & Digi-Reel® packaging. CRCW0805499RFKTA, CRCW0805499RFKEAHP, RCS0805499RFKEA, and RMCF0805FT499R are supplied in Tape & Reel (TR). AC0805FR-07499RL and RC0805FR-07499RL are supplied in Tape & Reel (TR). Packaging selection should align with assembly process requirements.

Q: Why is CRCW0805499RFKTA not recommended?

A: CRCW0805499RFKTA is RoHS non-compliant and REACH Affected. For applications requiring regulatory compliance with RoHS3 and REACH standards, alternative parts with compliant status are available.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes, provided the PCB footprint is 0805 (2012 Metric) and the circuit design accommodates the component height variations. Maximum seated heights range from 0.50mm to 0.70mm across substitute parts. PCB clearance and assembly equipment capabilities should be verified for height-sensitive applications.

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

A: All listed parts maintain ±100ppm/°C temperature coefficient, ensuring consistent resistance stability across the -55°C to 155°C operating range. This specification is identical across all substitutes and does not differentiate selection criteria.

Q: Are there inventory considerations for substitute selection?

A: Inventory levels vary significantly. CRCW0805499RFKEA (Vishay Dale) has 113,589 units in stock, while CRCW0805499RFKTA has 10,200 units. Inventory availability should be evaluated based on project timeline and supply chain requirements.

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