RC1608F6651CS Equivalent & Substitute Parts Reference

Part Overview

The RC1608F6651CS is a 6.65 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0603 (1608 Metric) package format with 0.1W power rating. This component is classified as Active product status with moisture-resistant construction and unlimited moisture sensitivity level (MSL 1). The part is RoHS3 compliant and REACH unaffected, suitable for general industrial and consumer applications requiring standard tolerance resistive elements. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and environmental compliance certifications.

Key Parameters

Parameter	Value	Specification Basis
Resistance Value	6.65 kOhms	Primary electrical specification
Tolerance	±1%	Precision classification
Power Rating	0.1W (1/10W)	Thermal dissipation capacity
Package / Case	0603 (1608 Metric)	Physical footprint and mounting
Composition	Thick Film	Construction technology
Temperature Coefficient	±100ppm/°C	Stability over temperature range
Operating Temperature Range	-55°C to +155°C	Environmental operating limits
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Handling and storage requirements
RoHS Status	ROHS3 Compliant	Environmental compliance

Substitute Part Grouping Explanation

Substitute parts for the RC1608F6651CS are classified into three categories based on substitution compatibility:

Direct Substitutes (Functionally Equivalent): Parts that match all critical electrical parameters (6.65 kOhms, ±1% tolerance, 0.1W power rating), mechanical dimensions (0603 package), composition (thick film), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C to +155°C). These parts are interchangeable without circuit redesign or performance impact.

Upgrade Substitutes (Enhanced or Discontinued): Parts that meet all electrical and mechanical specifications but may have different product status or availability. The MCR03ERTF6651 from Rohm Semiconductor is classified as discontinued at DiGi Electronics but maintains full electrical and mechanical compatibility.

Similar Substitutes (Application-Specific Variants): Parts that match all core electrical and mechanical parameters but include additional certifications or features. Automotive AEC-Q200 qualified variants (AC0603FR-076K65L, CRCW06036K65FKEA, ERJ-3EKF6651V, RMCF0603FT6K65) are suitable for applications requiring automotive-grade reliability but are not required for standard industrial use.

Substitution logic is based strictly on: resistance value, tolerance, power rating, package type, composition, temperature coefficient, operating temperature range, and compliance certifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Composition	Temp Coeff	Op Temp Range	MSL	RoHS	Product Status	Packaging Type
RC1608F6651CS	Samsung Electro-Mechanics	6.65 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55 to +155°C	1	ROHS3	Active	Tape & Reel
CR0603-FX-6651ELF	Bourns Inc.	6.65 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55 to +155°C	1	ROHS3	Active	Tape & Reel
RC0603FR-076K65L	YAGEO	6.65 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55 to +155°C	1	ROHS3	Active	Cut Tape & Digi-Reel
MCR03ERTF6651	Rohm Semiconductor	6.65 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55 to +155°C	1	ROHS3	Discontinued	Cut Tape & Digi-Reel
AC0603FR-076K65L	YAGEO	6.65 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55 to +155°C	1	ROHS3	Active	Cut Tape & Digi-Reel
CRCW06036K65FKEA	Vishay Dale	6.65 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55 to +155°C	1	ROHS3	Active	Cut Tape & Digi-Reel
ERJ-3EKF6651V	Panasonic Electronic Components	6.65 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55 to +155°C	1	ROHS3	Active	Tape & Reel
RMCF0603FT6K65	Stackpole Electronics Inc	6.65 kΩ	±1%	0.1	0603	Thick Film	±100ppm/°C	-55 to +155°C	1	ROHS3	Active	Tape & Reel

Engineering Selection Recommendations

For Standard Industrial Applications: CR0603-FX-6651ELF (Bourns Inc.) and RC0603FR-076K65L (YAGEO) are direct substitutes with active product status and equivalent electrical specifications. Both are available in high inventory quantities and maintain identical performance characteristics to the RC1608F6651CS.

For Automotive Applications: AC0603FR-076K65L, CRCW06036K65FKEA, ERJ-3EKF6651V, and RMCF0603FT6K65 are suitable alternatives when AEC-Q200 automotive qualification is required. These parts meet all electrical and mechanical specifications of the primary part while providing additional automotive-grade reliability certification.

For Discontinued Part Replacement: MCR03ERTF6651 (Rohm Semiconductor) is classified as discontinued at DiGi Electronics but remains electrically and mechanically compatible. This part should be selected only when existing inventory is available and long-term supply is not a concern.

Packaging Consideration: The RC1608F6651CS is supplied in Tape & Reel format. Equivalent parts are available in both Tape & Reel (CR0603-FX-6651ELF, ERJ-3EKF6651V, RMCF0603FT6K65) and Cut Tape & Digi-Reel formats (RC0603FR-076K65L, MCR03ERTF6651, AC0603FR-076K65L, CRCW06036K65FKEA). Packaging format selection depends on assembly equipment and procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can CR0603-FX-6651ELF be used as a direct replacement for RC1608F6651CS?

A: Yes. CR0603-FX-6651ELF matches all critical electrical parameters (6.65 kOhms ±1%, 0.1W), mechanical dimensions (0603 package), composition (thick film), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C to +155°C). Both parts are RoHS3 compliant with MSL 1 rating. No circuit modification is required.

Q: What is the difference between direct substitutes and automotive-qualified variants?

A: Direct substitutes (CR0603-FX-6651ELF, RC0603FR-076K65L) match all electrical and mechanical specifications without additional certifications. Automotive-qualified variants (AC0603FR-076K65L, CRCW06036K65FKEA, ERJ-3EKF6651V, RMCF0603FT6K65) include AEC-Q200 certification for automotive reliability but are electrically identical. Use automotive variants only when application requirements specify AEC-Q200 qualification.

Q: Are there dimensional differences between substitute parts?

A: All parts use 0603 (1608 Metric) package format with standard footprint compatibility. Minor dimensional variations exist: CRCW06036K65FKEA measures 0.061" L x 0.033" W (1.55mm x 0.85mm) versus standard 0.063" L x 0.031" W (1.60mm x 0.80mm), and RMCF0603FT6K65 measures 0.061" L x 0.031" W (1.55mm x 0.80mm). These variations are within 0603 package tolerance and do not affect PCB footprint compatibility.

Q: Why is MCR03ERTF6651 listed as discontinued?

A: MCR03ERTF6651 is classified as discontinued at DiGi Electronics but remains electrically and mechanically equivalent to RC1608F6651CS. This part should be used only when existing inventory is available. For new designs or long-term supply requirements, select from active status alternatives.

Q: What packaging formats are available for equivalent parts?

A: Equivalent parts are supplied in two formats: Tape & Reel (TR) for automated assembly lines, and Cut Tape (CT) & Digi-Reel for mixed-volume production. RC1608F6651CS is supplied in Tape & Reel format. Equivalent Tape & Reel options include CR0603-FX-6651ELF, ERJ-3EKF6651V, and RMCF0603FT6K65.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant and REACH unaffected, matching the environmental compliance status of RC1608F6651CS.

Q: Can automotive-qualified parts be used in non-automotive applications?

A: Yes. Automotive-qualified parts (AC0603FR-076K65L, CRCW06036K65FKEA, ERJ-3EKF6651V, RMCF0603FT6K65) are fully compatible with non-automotive applications. AEC-Q200 certification represents enhanced reliability and does not restrict use in standard industrial or consumer applications.

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