RC1005F4121CS Equivalent & Substitute Parts Reference

Part Overview

The RC1005F4121CS is a 4.12 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0402 (1005 Metric) package format. This surface mount device is rated at 0.063W (1/16W) power dissipation and features moisture-resistant construction. The part is currently in active production status with 1,006 pieces available in inventory. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design requirements necessitate alternative sourcing options while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Resistance	4.12 kOhms
Tolerance	±1%
Power Rating	0.063W (1/16W)
Package / Case	0402 (1005 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant
Number of Terminations	2
Size / Dimension	0.039" L x 0.020" W (1.00mm x 0.50mm)
Height - Seated (Max)	0.016" (0.40mm)

Substitute Part Grouping Explanation

Substitution eligibility for the RC1005F4121CS is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Resistance value: 4.12 kOhms (exact match required)
Tolerance: ±1% (exact match required)
Package / Case: 0402 (1005 Metric) (exact match required)
Power Rating: 0.063W (1/16W) minimum (equal or higher acceptable)
Temperature Coefficient: ±100ppm/°C (exact match required)
Operating Temperature Range: -55°C ~ 155°C (exact match or wider range acceptable)
Composition: Thick Film (exact match required)
Number of Terminations: 2 (exact match required)
Moisture Sensitivity Level: 1 (Unlimited) (exact match required)

Substitution Categories:

Direct Equivalents maintain all electrical and mechanical parameters identical to the main part, including power rating, composition, and environmental specifications.

Upgrade Substitutes provide enhanced performance characteristics such as higher power ratings or automotive-grade certifications (AEC-Q200) while maintaining all other critical parameters.

Similar Substitutes match all core electrical specifications and package dimensions but may include additional features such as automotive qualification or alternative moisture-resistant properties.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Temp Coeff	Op Temp Range	MSL	RoHS Status	Features	Inventory
RC1005F4121CS	Samsung Electro-Mechanics	4.12 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1	ROHS3	Moisture Resistant	1,006
CR0402-FX-4121GLF	Bourns Inc.	4.12 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1	ROHS3	—	40,954
RC0402FR-074K12L	YAGEO	4.12 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1	ROHS3	Moisture Resistant	437,438
ERJ-2RKF4121X	Panasonic Electronic Components	4.12 kΩ	±1%	0.1W	0402	±100ppm/°C	-55°C ~ 155°C	1	ROHS3	Automotive AEC-Q200	107,721
AC0402FR-074K12L	YAGEO	4.12 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1	ROHS3	Automotive AEC-Q200, Moisture Resistant	46,649
CRCW04024K12FKED	Vishay Dale	4.12 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1	ROHS3	Automotive AEC-Q200	4,100
CRCW04024K12FKTD	Vishay Dale	4.12 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1	RoHS non-compliant	Automotive AEC-Q200	5,974
RMCF0402FT4K12	Stackpole Electronics Inc	4.12 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1	ROHS3	Automotive AEC-Q200	472,439

Engineering Selection Recommendations

Direct Equivalent Selection:

CR0402-FX-4121GLF (Bourns Inc.) and RC0402FR-074K12L (YAGEO) are direct functional equivalents to RC1005F4121CS. Both parts maintain identical electrical specifications, package dimensions, and environmental ratings. RC0402FR-074K12L offers significantly higher inventory availability (437,438 units) and includes moisture-resistant construction matching the original part specification. Both are ROHS3 compliant with MSL 1 rating.

Upgrade Selection for Enhanced Reliability:

ERJ-2RKF4121X (Panasonic Electronic Components) provides an upgrade path with increased power rating (0.1W versus 0.063W) and automotive AEC-Q200 qualification. This part is suitable for applications requiring higher thermal margin or automotive-grade component certification while maintaining all other electrical parameters. Inventory availability is substantial at 107,721 units.

Automotive-Grade Alternatives:

AC0402FR-074K12L (YAGEO) and RMCF0402FT4K12 (Stackpole Electronics Inc) both provide automotive AEC-Q200 certification with identical electrical specifications to the main part. AC0402FR-074K12L includes moisture-resistant features. RMCF0402FT4K12 offers the highest inventory level (472,439 units) among automotive-qualified options. Both are ROHS3 compliant.

Compliance Consideration:

CRCW04024K12FKTD (Vishay Dale) is RoHS non-compliant and REACH affected. This part is not recommended for new designs or applications requiring regulatory compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can I substitute RC1005F4121CS with a part having different power rating?

A: Yes, substitution with higher power ratings is acceptable. ERJ-2RKF4121X (0.1W) can replace RC1005F4121CS (0.063W) as the higher rating provides additional thermal margin. Substitution with lower power ratings is not acceptable.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All listed substitute parts use the 0402 (1005 Metric) package with identical dimensions: 0.039" L x 0.020" W (1.00mm x 0.50mm). Maximum seated height is 0.016" (0.40mm) for all parts except AC0402FR-074K12L at 0.015" (0.37mm), which is within acceptable tolerance for standard 0402 footprints.

Q: What is the difference between moisture-resistant and non-moisture-resistant versions?

A: RC1005F4121CS and RC0402FR-074K12L include moisture-resistant thick film construction. CR0402-FX-4121GLF does not specify moisture-resistant features. For applications in high-humidity environments or with extended storage requirements, moisture-resistant versions are preferred.

Q: Which substitute offers the best inventory availability?

A: RC0402FR-074K12L (YAGEO) provides the highest inventory at 437,438 units, followed by RMCF0402FT4K12 (Stackpole Electronics Inc) at 472,439 units. Both are suitable for high-volume production requirements.

Q: Can I use automotive-grade parts in non-automotive applications?

A: Yes. Automotive AEC-Q200 qualified parts (ERJ-2RKF4121X, AC0402FR-074K12L, CRCW04024K12FKED, RMCF0402FT4K12) meet or exceed standard commercial specifications and are fully compatible with non-automotive applications. These parts provide enhanced reliability margins.

Q: What is MSL 1 rating and why does it matter?

A: MSL (Moisture Sensitivity Level) 1 indicates unlimited shelf life without moisture bake-out requirements. All listed parts carry MSL 1 rating, eliminating moisture-related handling constraints during assembly and storage.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts except CRCW04024K12FKTD are ROHS3 compliant. CRCW04024K12FKTD is RoHS non-compliant and REACH affected, making it unsuitable for applications requiring regulatory compliance.

Q: What temperature coefficient specification means for circuit performance?

A: All parts including RC1005F4121CS maintain ±100ppm/°C temperature coefficient across the -55°C to 155°C operating range. This specification ensures resistance value stability across temperature variations, with maximum resistance change of ±0.41% across the full operating temperature range for the 4.12 kOhm value.

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