RCS2012F4993CS Equivalent & Substitute Parts Reference

Part Overview

The RCS2012F4993CS is a 499 kOhms ±1% 0.125W 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 characteristics. The part is ROHS3 compliant and carries MSL 1 (Unlimited) moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching electrical specifications (resistance value, tolerance, power rating) and mechanical compatibility (package type, dimensions, termination count). Substitutes may vary in manufacturer-specific features such as automotive qualification levels, pulse withstanding capability, or packaging format while maintaining functional interchangeability within the specified electrical and thermal operating parameters.

Key Parameters

Parameter	Value
Resistance	499 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 equivalence across the following critical parameters:

Mandatory Matching Parameters:

Resistance value: 499 kOhms
Tolerance: ±1%
Package / Case: 0805 (2012 Metric)
Composition: Thick Film
Temperature Coefficient: ±100ppm/°C
Operating Temperature Range: -55°C ~ 155°C
Number of Terminations: 2

Allowable Variations:

Power rating: Substitute parts rated at 0.125W (1/8W) or higher (0.5W / 1/2W) are acceptable. Higher power ratings provide additional thermal margin.
Packaging format: Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® formats are interchangeable for component procurement.
Manufacturer-specific features: Automotive AEC-Q200 qualification, pulse withstanding capability, and anti-sulfur coating are optional enhancements that do not affect base electrical compatibility.
Height variation: Seated height differences within the 0805 package specification (0.020" to 0.028") do not affect PCB assembly compatibility.
Compliance status: ROHS3 compliance is maintained across all listed substitutes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Temp Coeff	Operating Temp	Height Max	RoHS Status	Features
RCS2012F4993CS	Samsung Electro-Mechanics	499 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.026" (0.66mm)	ROHS3	Anti-Sulfur, Moisture Resistant
AC0805FR-07499KL	YAGEO	499 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024" (0.60mm)	ROHS3	Automotive AEC-Q200, Moisture Resistant
CRCW0805499KFKEA	Vishay Dale	499 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.020" (0.50mm)	ROHS3	Automotive AEC-Q200
CRCW0805499KFKEAHP	Vishay Dale	499 kOhms	±1%	0.5W	0805	±100ppm/°C	-55°C ~ 155°C	0.020" (0.50mm)	ROHS3	Automotive AEC-Q200, Pulse Withstanding
CRCW0805499KFKTA	Vishay Dale	499 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.020" (0.50mm)	RoHS non-compliant	Automotive AEC-Q200
ERJ-6ENF4993V	Panasonic Electronic Components	499 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.028" (0.70mm)	ROHS3	Automotive AEC-Q200
RC0805FR-07499KL	YAGEO	499 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.024" (0.60mm)	ROHS3	Moisture Resistant
RCS0805499KFKEA	Vishay Dale	499 kOhms	±1%	0.5W	0805	±100ppm/°C	-55°C ~ 155°C	0.020" (0.50mm)	ROHS3	Automotive AEC-Q200, Pulse Withstanding
RMCF0805FT499K	Stackpole Electronics Inc	499 kOhms	±1%	0.125W	0805	±100ppm/°C	-55°C ~ 155°C	0.026" (0.65mm)	ROHS3	Automotive AEC-Q200

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

Parts AC0805FR-07499KL, CRCW0805499KFKEA, ERJ-6ENF4993V, RC0805FR-07499KL, and RMCF0805FT499K maintain full electrical and mechanical compatibility with RCS2012F4993CS. All are ROHS3 compliant with MSL 1 rating. Selection among these options depends on packaging availability (Tape & Reel vs. Cut Tape) and manufacturer preference. Automotive AEC-Q200 qualified variants (AC0805FR-07499KL, CRCW0805499KFKEA, ERJ-6ENF4993V, RMCF0805FT499K) provide additional qualification for automotive applications without affecting general-purpose circuit performance.

Higher Power Rating Alternatives:

CRCW0805499KFKEAHP and RCS0805499KFKEA are rated at 0.5W (1/2W) instead of 0.125W. These parts are mechanically and electrically compatible and provide enhanced thermal performance. Selection of higher power-rated components is appropriate when circuit design margins require additional power dissipation capability or when thermal stress analysis indicates benefit from increased power rating.

Compliance Consideration:

CRCW0805499KFKTA is RoHS non-compliant and REACH affected. This part is functionally equivalent but should be selected only when legacy or non-regulated applications explicitly permit non-compliant components. For new designs and regulated applications, ROHS3 compliant alternatives are required.

Frequently Asked Questions (FAQ)

Q: Can CRCW0805499KFKEAHP (0.5W) be used as a direct replacement for RCS2012F4993CS (0.125W)?

A: Yes. The 0.5W part is mechanically and electrically compatible. Higher power rating provides additional thermal margin and does not degrade circuit performance. PCB layout and thermal management remain unchanged.

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

A: Both formats contain identical components. Tape & Reel packaging is supplied on continuous carrier tape suitable for automated pick-and-place assembly. Cut Tape & Digi-Reel® format provides smaller quantities on cut tape segments. Selection depends on production volume and assembly equipment compatibility.

Q: Are automotive AEC-Q200 qualified parts suitable for non-automotive applications?

A: Yes. AEC-Q200 qualification indicates additional testing and reliability screening. These parts meet or exceed general-purpose specifications and are fully compatible with non-automotive circuits.

Q: Does height variation (0.020" to 0.028") affect PCB assembly?

A: No. All listed parts conform to 0805 (2012 Metric) package specification. Height variations within this range do not affect reflow soldering, component placement, or PCB clearance.

Q: Is CRCW0805499KFKTA acceptable for new designs?

A: CRCW0805499KFKTA is RoHS non-compliant. For new designs subject to ROHS3 requirements or environmental regulations, use ROHS3 compliant alternatives. Legacy system repairs may permit non-compliant components if original design specifications allow.

Q: Can I substitute RC0805FR-07499KL (non-automotive) for automotive applications?

A: RC0805FR-07499KL lacks AEC-Q200 automotive qualification. For automotive applications requiring AEC-Q200 compliance, select qualified alternatives: AC0805FR-07499KL, CRCW0805499KFKEA, ERJ-6ENF4993V, or RMCF0805FT499K.

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

A: Temperature coefficient indicates resistance change per degree Celsius. ±100ppm/°C is standard for thick film resistors and ensures stable performance across the -55°C to 155°C operating range. All listed substitutes maintain this specification.

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