Equivalent & Substitute Parts for RCS2012F5490CS

Part Overview

The RCS2012F5490CS is a 549 Ohm ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics, rated at 0.125W (1/8W) 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 based on matching electrical specifications, mechanical dimensions, and packaging standards to ensure direct circuit board compatibility and functional interchangeability.

Key Parameters

Parameter	Specification
Resistance Value	549 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
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the RCS2012F5490CS is determined by strict equivalence across the following critical parameters:

Electrical Equivalence Requirements:

Resistance value: 549 Ohms (exact match)
Tolerance: ±1% (exact match)
Power rating: 0.125W / 1/8W (exact match)
Temperature coefficient: ±100ppm/°C (exact match)
Operating temperature range: -55°C ~ 155°C (exact match)

Mechanical & Package Equivalence Requirements:

Package type: 0805 (2012 Metric) (exact match)
Number of terminations: 2 (exact match)
Composition: Thick Film (exact match)

Compliance & Environmental Requirements:

RoHS3 Compliant (all substitutes)
Moisture Sensitivity Level: 1 (Unlimited) (all substitutes)
REACH Status: REACH Unaffected (all substitutes)

All identified substitute parts meet these criteria. Additional features such as Automotive AEC-Q200 certification or anti-sulfur properties represent enhanced capabilities beyond the base specification and do not disqualify substitution.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op. Temp Range	Height Max (mm)	RoHS	MSL
RCS2012F5490CS	Samsung Electro-Mechanics	549 Ω	±1%	0.125	0805	±100ppm/°C	-55 ~ 155°C	0.66	ROHS3	1
AC0805FR-07549RL	YAGEO	549 Ω	±1%	0.125	0805	±100ppm/°C	-55 ~ 155°C	0.60	ROHS3	1
CRCW0805549RFKEA	Vishay Dale	549 Ω	±1%	0.125	0805	±100ppm/°C	-55 ~ 155°C	0.50	ROHS3	1
ERJ-6ENF5490V	Panasonic Electronic Components	549 Ω	±1%	0.125	0805	±100ppm/°C	-55 ~ 155°C	0.70	ROHS3	1
RC0805FR-07549RL	YAGEO	549 Ω	±1%	0.125	0805	±100ppm/°C	-55 ~ 155°C	0.60	ROHS3	1
RMCF0805FT549R	Stackpole Electronics Inc	549 Ω	±1%	0.125	0805	±100ppm/°C	-55 ~ 155°C	0.65	ROHS3	1

Engineering Selection Recommendations

All five substitute parts are functionally equivalent to the RCS2012F5490CS based on electrical and mechanical parameters. Selection among these alternatives should be based on the following factors:

Product Status & Availability: All substitute parts maintain Active product status, ensuring continued supply and manufacturing support.

Compliance Certifications:

AC0805FR-07549RL, CRCW0805549RFKEA, ERJ-6ENF5490R, and RMCF0805FT549R include Automotive AEC-Q200 certification, suitable for automotive and high-reliability applications.
RC0805FR-07549RL and RCS2012F5490CS do not carry AEC-Q200 certification but remain ROHS3 compliant for general industrial applications.

Physical Dimensions: All parts conform to 0805 (2012 Metric) package dimensions (0.079" L x 0.049" W / 2.00mm x 1.25mm). Seated height varies between 0.50mm and 0.70mm; verify PCB assembly equipment clearance specifications if height-constrained applications exist.

Inventory Availability: Substitute parts demonstrate higher inventory levels (10,939 to 81,492 units) compared to the main part (824 units), providing supply chain flexibility.

Frequently Asked Questions (FAQ)

Q: Can AC0805FR-07549RL be used as a direct replacement for RCS2012F5490CS?

A: Yes. Both parts share identical electrical specifications (549 Ω, ±1%, 0.125W, ±100ppm/°C, -55°C ~ 155°C) and mechanical package (0805). The AC0805FR-07549RL includes additional Automotive AEC-Q200 certification, which does not prevent substitution in non-automotive applications.

Q: What is the difference between the substitute parts?

A: All substitute parts meet the core electrical and mechanical requirements. Differences exist only in manufacturer identity, seated height (0.50mm to 0.70mm), and certification status. AC0805FR-07549RL, CRCW0805549RFKEA, ERJ-6ENF5490V, and RMCF0805FT549R carry AEC-Q200 certification; RC0805FR-07549RL does not.

Q: Are there any compatibility concerns with PCB assembly?

A: No compatibility concerns exist for standard 0805 package assembly processes. Verify that PCB design accommodates the maximum seated height of 0.70mm (ERJ-6ENF5490V) if space constraints exist. All parts use identical 2-termination configuration and footprint.

Q: Does the RoHS3 compliance apply to all substitutes?

A: Yes. All substitute parts and the main part are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited) and REACH Unaffected status, meeting current environmental and regulatory requirements.

Q: Which substitute part should be selected for automotive applications?

A: AC0805FR-07549RL, CRCW0805549RFKEA, ERJ-6ENF5490V, and RMCF0805FT549R all carry Automotive AEC-Q200 certification and are suitable for automotive circuit designs. Selection among these four should be based on inventory availability and supplier preference.

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