RCS2012F4021CS Equivalent & Substitute Parts

Part Overview

The RCS2012F4021CS is a 4.02 kOhms ±1% 0.125W (1/8W) chip resistor manufactured by Samsung Electro-Mechanics in 0805 (2012 Metric) package format. This thick film resistor features anti-sulfur and moisture-resistant properties with a temperature coefficient of ±100ppm/°C and operating range of -55°C to 155°C. The part is ROHS3 compliant with MSL 1 (Unlimited) rating and is currently in active production status with 914 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, design redundancy, and supply chain continuity when the primary part becomes unavailable or when alternative specifications better suit application requirements.

Key Parameters

Parameter	Value
Resistance	4.02 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 to 155°C
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	ROHS3 Compliant
Packaging Format	Tape & Reel (TR)

Substitute Part Grouping Explanation

Substitute parts for the RCS2012F4021CS are grouped based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters (Must Match):

Resistance value: 4.02 kOhms
Tolerance: ±1%
Package / Case: 0805 (2012 Metric)
Composition: Thick Film
Temperature Coefficient: ±100ppm/°C
Operating Temperature Range: -55°C to 155°C
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Parameters (Allowable Variation):

Power Rating: 0.125W (1/8W) as primary specification; higher power ratings (0.4W, 0.5W) are acceptable as they provide equal or greater capability
Physical Height: Variation within 0.020" to 0.028" seated height is acceptable within 0805 package constraints
Compliance Certifications: ROHS3 compliance required; AEC-Q200 automotive rating is optional enhancement
Packaging Format: Tape & Reel (TR) primary; Cut Tape (CT) acceptable for equivalent electrical performance

Substitutes are organized into two categories: Direct Equivalents (matching all parameters including power rating) and Enhanced Substitutes (higher power rating or additional certifications while maintaining core electrical specifications).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	Height Max (mm)	RoHS Status	AEC-Q200	Inventory
RCS2012F4021CS	Samsung Electro-Mechanics	4.02 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155°C	0.66	ROHS3	No	914
AC0805FR-074K02L	YAGEO	4.02 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155°C	0.60	ROHS3	Yes	10732
CRCW08054K02FKEA	Vishay Dale	4.02 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155°C	0.50	ROHS3	Yes	36993
CRCW08054K02FKEAHP	Vishay Dale	4.02 kΩ	±1%	0.5	0805	±100ppm/°C	-55 to 155°C	0.50	ROHS3	Yes	19414
CRCW08054K02FKTA	Vishay Dale	4.02 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155°C	0.50	RoHS Non-compliant	Yes	2058
ERJ-6ENF4021V	Panasonic Electronic Components	4.02 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155°C	0.70	ROHS3	Yes	134286
ESR10EZPF4021	Rohm Semiconductor	4.02 kΩ	±1%	0.4	0805	±100ppm/°C	-55 to 155°C	0.65	ROHS3	Yes	27440
RC0805FR-074K02L	YAGEO	4.02 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155°C	0.60	ROHS3	No	96894
RCS08054K02FKEA	Vishay Dale	4.02 kΩ	±1%	0.5	0805	±100ppm/°C	-55 to 155°C	0.50	ROHS3	Yes	7375
RMCF0805FT4K02	Stackpole Electronics Inc	4.02 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155°C	0.65	ROHS3	Yes	8415

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical and Power Specifications):

The following parts provide direct substitution with matching 0.125W power rating and all core electrical parameters:

AC0805FR-074K02L (YAGEO): ROHS3 compliant with AEC-Q200 automotive qualification. High inventory availability (10,732 units). Suitable for automotive and industrial applications requiring automotive-grade reliability.
CRCW08054K02FKEA (Vishay Dale): ROHS3 compliant with AEC-Q200 automotive qualification. Highest inventory availability (36,993 units). Compact 0.50mm seated height. Recommended for high-volume procurement and automotive applications.
ERJ-6ENF4021V (Panasonic Electronic Components): ROHS3 compliant with AEC-Q200 automotive qualification. Largest inventory availability (134,286 units). Excellent supply chain security. Recommended as primary substitute for continuous availability.
RC0805FR-074K02L (YAGEO): ROHS3 compliant without automotive certification. High inventory (96,894 units). Suitable for non-automotive consumer and industrial applications.
RMCF0805FT4K02 (Stackpole Electronics Inc): ROHS3 compliant with AEC-Q200 automotive qualification. Adequate inventory (8,415 units). Suitable for automotive applications.

Enhanced Substitutes (Higher Power Rating):

The following parts provide increased power dissipation capability while maintaining all core electrical specifications:

CRCW08054K02FKEAHP (Vishay Dale): 0.5W power rating with pulse withstanding capability. ROHS3 compliant with AEC-Q200 automotive qualification. Inventory: 19,414 units. Use when circuit design requires higher power margin or pulse withstanding performance.
ESR10EZPF4021 (Rohm Semiconductor): 0.4W power rating with pulse withstanding capability. ROHS3 compliant with AEC-Q200 automotive qualification. Inventory: 27,440 units. Use when circuit design requires higher power margin or pulse withstanding performance.
RCS08054K02FKEA (Vishay Dale): 0.5W power rating with pulse withstanding capability. ROHS3 compliant with AEC-Q200 automotive qualification. Inventory: 7,375 units. Use when circuit design requires higher power margin or pulse withstanding performance.

Non-Recommended Substitute:

CRCW08054K02FKTA (Vishay Dale): RoHS non-compliant status and REACH affected status make this part unsuitable for new designs or applications requiring regulatory compliance. Use only for legacy system maintenance where original compliance status is not required.

Frequently Asked Questions (FAQ)

Q1: Can I use a substitute part with higher power rating (0.4W or 0.5W) in place of the 0.125W RCS2012F4021CS?

A: Yes. Higher power-rated resistors are electrically compatible substitutes. The 0.4W and 0.5W variants (ESR10EZPF4021, CRCW08054K02FKEAHP, RCS08054K02FKEA) maintain identical resistance, tolerance, temperature coefficient, and operating temperature range. Higher power rating provides additional thermal margin and does not negatively impact circuit performance. Physical dimensions remain within 0805 package constraints.

Q2: What is the difference between parts with and without AEC-Q200 certification?

A: AEC-Q200 is an automotive industry qualification standard indicating the part has undergone rigorous reliability testing for automotive applications. Parts with AEC-Q200 certification (AC0805FR-074K02L, CRCW08054K02FKEA, ERJ-6ENF4021V, ESR10EZPF4021, RCS08054K02FKEA, RMCF0805FT4K02) are suitable for automotive and high-reliability industrial applications. Parts without AEC-Q200 (RCS2012F4021CS, RC0805FR-074K02L) are suitable for consumer and general industrial applications. Selection depends on application requirements, not electrical performance.

Q3: Are there physical dimension differences between substitute parts?

A: Yes. While all parts conform to 0805 (2012 Metric) package specification, seated height varies from 0.50mm to 0.70mm. This variation is within normal 0805 package tolerance and does not affect PCB layout or assembly. Specific height values are provided in the Parameter Comparison table for applications with tight vertical clearance constraints.

Q4: Which substitute part offers the best supply chain security?

A: ERJ-6ENF4021V (Panasonic Electronic Components) offers the highest inventory availability at 134,286 units, providing superior supply chain security. CRCW08054K02FKEA (Vishay Dale) with 36,993 units and RC0805FR-074K02L (YAGEO) with 96,894 units are also strong alternatives for continuous availability.

Q5: Can I use CRCW08054K02FKTA as a substitute?

A: CRCW08054K02FKTA is not recommended for new designs. This part is RoHS non-compliant and REACH affected, making it unsuitable for applications requiring regulatory compliance. Use only for legacy system maintenance where original compliance status is not required and regulatory compliance is not a design constraint.

Q6: What packaging formats are available for these substitutes?

A: Most substitutes are supplied in Tape & Reel (TR) format, standard for high-volume production. CRCW08054K02FKTA is available in Cut Tape (CT) & Digi-Reel® format. Packaging format does not affect electrical performance; selection depends on assembly process requirements and order quantity.

Q7: Are all substitute parts ROHS3 compliant?

A: All substitute parts except CRCW08054K02FKTA are ROHS3 compliant. ROHS3 compliance is required for applications subject to European Union Restriction of Hazardous Substances regulations. Verify compliance requirements for your specific application before part selection.

Q8: Do substitute parts have the same moisture sensitivity level?

A: Yes. All parts listed have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity and no special storage or handling requirements. This specification is consistent across all substitutes and the primary part.

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