RC1005F3921CS Equivalent & Substitute Parts

Part Overview

The RC1005F3921CS is a 3.92 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in the 0402 (1005 Metric) package format. This surface-mount device is rated for 0.063W (1/16W) power dissipation and features moisture-resistant construction. The part is currently in active production status with 859 units available in inventory. Equivalent and substitute parts are necessary to address supply chain continuity, alternative sourcing options, and application-specific requirements such as automotive qualification or enhanced power ratings.

Key Parameters

Parameter	Value
Resistance	3.92 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	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the RC1005F3921CS is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Resistance value: 3.92 kOhms
Tolerance: ±1%
Package / Case: 0402 (1005 Metric)
Composition: Thick Film
Temperature Coefficient: ±100ppm/°C
Operating Temperature Range: -55°C ~ 155°C
Moisture Sensitivity Level: 1 (Unlimited)

Allowable Variation Parameters:

Power Rating: Substitutes with equal or higher power ratings are acceptable
Features: Additional certifications (AEC-Q200 automotive qualification) do not disqualify substitution
Manufacturer: Different manufacturers producing identical electrical and mechanical specifications are valid substitutes

Substitute parts are categorized as follows:

Direct Substitutes: Parts with identical electrical specifications, package dimensions, and power ratings.

Upgrade Substitutes: Parts with identical electrical specifications and package but higher power ratings, suitable for applications requiring enhanced thermal performance.

Similar Substitutes: Parts with identical core specifications but additional certifications or feature enhancements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Temp Coeff	Op Temp Range	Features	RoHS Status	Inventory
RC1005F3921CS	Samsung Electro-Mechanics	3.92 kOhms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	ROHS3 Compliant	859 Pcs
CR0402-FX-3921GLF	Bourns Inc.	3.92 kOhms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	—	ROHS3 Compliant	42886 Pcs
RC0402FR-073K92L	YAGEO	3.92 kOhms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	ROHS3 Compliant	18045 Pcs
ERJ-2RKF3921X	Panasonic Electronic Components	3.92 kOhms	±1%	0.1W	0402	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3 Compliant	164283 Pcs
AC0402FR-073K92L	YAGEO	3.92 kOhms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Moisture Resistant	ROHS3 Compliant	81369 Pcs
CRCW04023K92FKED	Vishay Dale	3.92 kOhms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3 Compliant	32577 Pcs
CRCW04023K92FKTD	Vishay Dale	3.92 kOhms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	RoHS non-compliant	20136 Pcs
RMCF0402FT3K92	Stackpole Electronics Inc	3.92 kOhms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	ROHS3 Compliant	86903 Pcs

Engineering Selection Recommendations

Direct Substitutes (Equivalent Replacement):

CR0402-FX-3921GLF (Bourns Inc.) and RC0402FR-073K92L (YAGEO) are direct functional equivalents to the RC1005F3921CS. Both parts maintain identical electrical specifications, package dimensions, power ratings, and temperature characteristics. CR0402-FX-3921GLF offers significantly higher inventory availability (42886 units). RC0402FR-073K92L includes moisture-resistant construction matching the original part specification.

Upgrade Substitute (Enhanced Performance):

ERJ-2RKF3921X (Panasonic Electronic Components) provides a higher power rating of 0.1W (1/10W) while maintaining all other electrical parameters. This part is suitable for applications requiring improved thermal margin or higher dissipation capability. The part carries Automotive AEC-Q200 qualification and offers the highest inventory level (164283 units).

Automotive-Qualified Alternatives:

AC0402FR-073K92L (YAGEO), CRCW04023K92FKED (Vishay Dale), and RMCF0402FT3K92 (Stackpole Electronics Inc) are all AEC-Q200 automotive-qualified alternatives. AC0402FR-073K92L combines automotive qualification with moisture-resistant construction. RMCF0402FT3K92 offers the second-highest inventory availability (86903 units) among qualified options.

Compliance Consideration:

CRCW04023K92FKTD (Vishay Dale) is not ROHS3 compliant and is REACH affected. This part is not recommended for applications requiring regulatory compliance with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can I substitute the RC1005F3921CS with a part having a higher power rating?

A: Yes. The ERJ-2RKF3921X rated at 0.1W (1/10W) is a valid substitute. Higher power ratings provide additional thermal margin without affecting electrical performance in the circuit. All other parameters remain identical.

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

A: Yes. Automotive-qualified parts meet or exceed the electrical and reliability specifications of standard industrial-grade parts. They are fully compatible with non-automotive applications and provide enhanced quality assurance.

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

A: Moisture-resistant construction provides enhanced protection against humidity and environmental exposure. The RC1005F3921CS, RC0402FR-073K92L, and AC0402FR-073K92L all feature moisture-resistant construction. Non-moisture-resistant alternatives (CR0402-FX-3921GLF, CRCW04023K92FKED, RMCF0402FT3K92, ERJ-2RKF3921X) are suitable for standard operating environments but may require additional protection in high-humidity applications.

Q: Are all substitute parts available in the same packaging format?

A: Yes. All listed substitute parts are supplied in Tape & Reel (TR) packaging in the 0402 (1005 Metric) package format, ensuring compatibility with standard pick-and-place assembly equipment.

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

A: The temperature coefficient indicates the resistance change per degree Celsius across the operating temperature range. All listed parts maintain identical ±100ppm/°C specifications, ensuring consistent performance across the -55°C to 155°C operating range.

Q: Can I use CRCW04023K92FKTD in new designs?

A: CRCW04023K92FKTD is not ROHS3 compliant and is REACH affected. It is not recommended for new designs or applications requiring regulatory compliance with current environmental standards. Use CRCW04023K92FKED (ROHS3 compliant variant) instead.

Q: Which substitute offers the best inventory availability?

A: ERJ-2RKF3921X (Panasonic Electronic Components) offers the highest inventory level at 164283 units. RMCF0402FT3K92 (Stackpole Electronics Inc) provides the second-highest availability at 86903 units.

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