RC1005F4321CS Equivalent & Substitute Parts Reference

Part Overview

The RC1005F4321CS is a 4.32 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 with moisture resistant construction and operates across the -55°C to 155°C temperature range. The part maintains Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified to address inventory availability, supply chain continuity, and application-specific requirements such as automotive qualification or enhanced power ratings.

Key Parameters

Parameter	Value
Resistance	4.32 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
Terminations	2
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RC1005F4321CS are classified based on electrical and mechanical parameter alignment with the main part. All identified substitutes maintain identical resistance value (4.32 kOhms), tolerance (±1%), package format (0402), composition (thick film), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C ~ 155°C). The primary differentiators among substitute groups are:

Direct Equivalents: Parts with matching power rating (0.063W / 1/16W), moisture resistant features, and standard industrial compliance.

Upgrade Category: Parts with enhanced power rating (0.1W / 1/10W) suitable for applications requiring higher thermal dissipation capacity while maintaining all other electrical specifications.

Automotive-Qualified Variants: Parts certified to AEC-Q200 automotive standards with or without moisture resistant construction, applicable to automotive and high-reliability applications.

Substitution eligibility is determined by matching resistance, tolerance, package, composition, temperature coefficient, and operating temperature range. Power rating upgrades are permissible in applications where higher dissipation capacity does not create thermal or layout constraints. Automotive qualification is application-dependent and does not affect electrical interchangeability for non-automotive use cases.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Temp Coeff	Op Temp Range	Moisture Resistant	AEC-Q200	RoHS Status
RC1005F4321CS	Samsung Electro-Mechanics	4.32 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Yes	No	ROHS3
CR0402-FX-4321GLF	Bourns Inc.	4.32 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	No	No	ROHS3
RC0402FR-074K32L	YAGEO	4.32 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Yes	No	ROHS3
ERJ-2RKF4321X	Panasonic Electronic Components	4.32 kΩ	±1%	0.1W	0402	±100ppm/°C	-55°C ~ 155°C	No	Yes	ROHS3
AC0402FR-074K32L	YAGEO	4.32 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	Yes	Yes	ROHS3
CRCW04024K32FKTD	Vishay Dale	4.32 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	No	Yes	RoHS non-compliant
RMCF0402FT4K32	Stackpole Electronics Inc	4.32 kΩ	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	No	Yes	ROHS3

Engineering Selection Recommendations

For Standard Industrial Applications: RC0402FR-074K32L (YAGEO) or CR0402-FX-4321GLF (Bourns Inc.) provide direct electrical and mechanical equivalence to the RC1005F4321CS. Both maintain ROHS3 compliance and identical electrical specifications. RC0402FR-074K32L includes moisture resistant construction matching the original part.

For Automotive Applications: AC0402FR-074K32L (YAGEO) or RMCF0402FT4K32 (Stackpole Electronics Inc.) are suitable selections, both certified to AEC-Q200 automotive standards with ROHS3 compliance. AC0402FR-074K32L additionally provides moisture resistant construction. ERJ-2RKF4321X (Panasonic Electronic Components) offers automotive qualification with enhanced 0.1W power rating for applications requiring higher thermal margin.

For High-Reliability or Moisture-Sensitive Environments: RC0402FR-074K32L (YAGEO) or AC0402FR-074K32L (YAGEO) are recommended due to moisture resistant construction combined with ROHS3 compliance.

Compliance Consideration: CRCW04024K32FKTD (Vishay Dale) is RoHS non-compliant and REACH affected. Selection of this part requires explicit compliance verification against application and regional regulatory requirements.

Power Rating Upgrade Path: ERJ-2RKF4321X (Panasonic Electronic Components) with 0.1W rating is suitable for applications where the standard 0.063W rating presents thermal constraints, provided circuit layout accommodates the component without thermal management issues.

Frequently Asked Questions (FAQ)

Q: Can RC0402FR-074K32L be used as a direct replacement for RC1005F4321CS?

A: Yes. RC0402FR-074K32L maintains identical resistance (4.32 kΩ), tolerance (±1%), power rating (0.063W), package (0402), temperature coefficient (±100ppm/°C), operating temperature range (-55°C ~ 155°C), and includes moisture resistant construction. Both are ROHS3 compliant. Electrical and mechanical interchangeability is confirmed.

Q: What is the difference between the standard 0.063W and the 0.1W power-rated ERJ-2RKF4321X?

A: The ERJ-2RKF4321X provides higher power dissipation capacity (0.1W versus 0.063W) while maintaining all other electrical parameters. This upgrade is applicable only in applications where thermal dissipation requirements exceed the standard rating. The higher power rating does not affect electrical performance in standard applications but may introduce thermal considerations in high-density layouts.

Q: Is CRCW04024K32FKTD suitable for new designs?

A: CRCW04024K32FKTD is RoHS non-compliant and REACH affected. Selection requires explicit verification against application regulatory requirements and customer compliance mandates. For new designs targeting RoHS3 compliance, alternative parts such as RC0402FR-074K32L, AC0402FR-074K32L, or RMCF0402FT4K32 are recommended.

Q: Which substitute part is recommended for automotive applications?

A: AC0402FR-074K32L (YAGEO) or RMCF0402FT4K32 (Stackpole Electronics Inc.) are recommended for automotive applications, both certified to AEC-Q200 standards with ROHS3 compliance. AC0402FR-074K32L additionally includes moisture resistant construction. ERJ-2RKF4321X (Panasonic Electronic Components) is also automotive-qualified with enhanced 0.1W power rating.

Q: Does moisture resistant construction affect electrical performance?

A: Moisture resistant construction does not alter electrical performance. It provides enhanced reliability in humid or moisture-exposed environments. Parts with moisture resistant features (RC1005F4321CS, RC0402FR-074K32L, AC0402FR-074K32L) maintain identical electrical specifications to non-moisture-resistant equivalents.

Q: Are all substitute parts available in Tape & Reel (TR) packaging?

A: Yes. All identified substitute parts are supplied in Tape & Reel (TR) packaging format, consistent with the original RC1005F4321CS packaging specification.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity level?

A: MSL 1 indicates unlimited shelf life and moisture sensitivity. Components with this rating do not require special moisture control during storage or handling, simplifying supply chain management and reducing storage costs compared to higher MSL ratings.

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