RC1005F681CS Equivalent & Substitute Parts Reference

Part Overview

The RC1005F681CS is a 680 Ohm ±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 temperature range of -55°C to 155°C. The part maintains Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and package compatibility to ensure direct circuit board integration without design modification.

Key Parameters

Parameter	Value
Resistance	680 Ohms
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 to 155°C
Size / Dimension	0.039" L x 0.020" W (1.00mm x 0.50mm)
Height - Seated (Max)	0.016" (0.40mm)
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RC1005F681CS are classified based on strict electrical and mechanical parameter matching. All identified substitutes maintain the following core specifications: 680 Ohm resistance value, ±1% tolerance, 0402 (1005 Metric) package format, thick film composition, ±100ppm/°C temperature coefficient, and -55°C to 155°C operating temperature range. Substitution eligibility is determined by these parameters alone. Parts are grouped into three categories:

Direct Equivalents share identical electrical ratings (0.063W power), packaging format (Tape & Reel), and core construction without additional certifications or features.

Upgrade Substitutes provide enhanced power rating (0.1W instead of 0.063W) while maintaining all other core specifications, offering improved thermal performance in the same package footprint.

Similar Substitutes match all core electrical and mechanical parameters but include additional automotive certifications (AEC-Q200) or enhanced features (anti-sulfur, moisture resistant) and may differ in packaging format (Tape & Reel versus Cut Tape & Digi-Reel).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Temperature Coefficient	Operating Temperature	Size (mm)	Height Max (mm)	RoHS Status	MSL	Packaging Type
RC1005F681CS	Samsung Electro-Mechanics	680 Ohms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1.00 x 0.50	0.40	ROHS3	1	Tape & Reel
CR0402-FX-6800GLF	Bourns Inc.	680 Ohms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1.00 x 0.50	0.40	ROHS3	1	Tape & Reel
RC0402FR-07680RL	YAGEO	680 Ohms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1.00 x 0.50	0.40	ROHS3	1	Cut Tape & Digi-Reel
ERJ-2RKF6800X	Panasonic Electronic Components	680 Ohms	±1%	0.1W	0402	±100ppm/°C	-55°C ~ 155°C	1.00 x 0.50	0.40	ROHS3	1	Cut Tape & Digi-Reel
AC0402FR-07680RL	YAGEO	680 Ohms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1.00 x 0.50	0.37	ROHS3	1	Tape & Reel
AF0402FR-07680RL	YAGEO	680 Ohms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1.00 x 0.50	0.37	ROHS3	1	Tape & Reel
CRCW0402680RFKED	Vishay Dale	680 Ohms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1.00 x 0.50	0.40	ROHS3	1	Tape & Reel
RMCF0402FT680R	Stackpole Electronics Inc	680 Ohms	±1%	0.063W	0402	±100ppm/°C	-55°C ~ 155°C	1.00 x 0.50	0.40	ROHS3	1	Cut Tape & Digi-Reel

Engineering Selection Recommendations

Direct Equivalent Selection: CR0402-FX-6800GLF (Bourns Inc.) provides identical electrical specifications and Tape & Reel packaging matching the RC1005F681CS. Both parts maintain ROHS3 compliance and MSL 1 rating with equivalent thermal and dimensional characteristics. This part is suitable for direct substitution in applications where packaging format consistency is required.

Alternative Direct Equivalent: RC0402FR-07680RL (YAGEO) matches all core electrical parameters and offers moisture resistant construction identical to the main part. The Cut Tape & Digi-Reel packaging format differs from the original Tape & Reel format but maintains mechanical compatibility for board assembly.

Upgrade Option: ERJ-2RKF6800X (Panasonic Electronic Components) provides enhanced power rating at 0.1W (1/10W) compared to the 0.063W (1/16W) specification of the RC1005F681CS. This part includes AEC-Q200 automotive certification and maintains all other core specifications. Selection of this upgrade is appropriate for applications requiring improved thermal margin or automotive-grade reliability.

Automotive-Qualified Alternatives: AC0402FR-07680RL, AF0402FR-07680RL, CRCW0402680RFKED, and RMCF0402FT680R all incorporate AEC-Q200 automotive certification while maintaining the 0.063W power rating and core electrical specifications. AC0402FR-07680RL and AF0402FR-07680RL feature reduced seated height (0.37mm versus 0.40mm). AF0402FR-07680RL includes anti-sulfur protection. These parts are suitable for applications requiring automotive-grade component qualification.

Frequently Asked Questions (FAQ)

Q: Can CR0402-FX-6800GLF directly replace RC1005F681CS without circuit modification?

A: Yes. CR0402-FX-6800GLF matches all core electrical specifications (680 Ohms ±1%, 0.063W power rating, ±100ppm/°C temperature coefficient, -55°C to 155°C operating range) and package format (0402). Both parts are ROHS3 compliant with MSL 1 rating. Direct substitution is supported at the component level.

Q: What is the difference between the 0.063W and 0.1W power ratings?

A: Power rating indicates maximum continuous power dissipation capability. The ERJ-2RKF6800X upgrade at 0.1W (1/10W) provides higher thermal capacity than the 0.063W (1/16W) specification of the RC1005F681CS. In applications where resistor power dissipation approaches the rated limit, the higher power rating offers improved thermal margin and reliability. All other electrical parameters remain identical.

Q: Are packaging format differences (Tape & Reel versus Cut Tape & Digi-Reel) significant for substitution?

A: Packaging format affects supply and handling but does not impact electrical or mechanical compatibility on the circuit board. Both Tape & Reel and Cut Tape & Digi-Reel formats contain identical 0402 package components with matching footprints and solder pad configurations. Format selection depends on assembly process requirements and supply chain availability.

Q: What does AEC-Q200 certification indicate?

A: AEC-Q200 is an automotive industry standard qualification for passive components. Parts bearing this certification (AC0402FR-07680RL, AF0402FR-07680RL, CRCW0402680RFKED, RMCF0402FT680R, and ERJ-2RKF6800X) have undergone enhanced reliability testing and are approved for automotive applications. Non-automotive applications do not require this certification, but automotive-qualified parts are acceptable substitutes in non-automotive circuits.

Q: Does the 0.03mm difference in seated height (0.40mm versus 0.37mm) affect board assembly?

A: The 0.03mm height difference is within typical PCB assembly tolerances and does not affect reflow soldering, component placement, or board-level functionality. Both dimensions are acceptable for standard surface mount assembly processes.

Q: Why are multiple substitute options provided?

A: Multiple substitutes reflect different manufacturer offerings with identical core specifications. Selection among CR0402-FX-6800GLF, RC0402FR-07680RL, AC0402FR-07680RL, AF0402FR-07680RL, CRCW0402680RFKED, and RMCF0402FT680R depends on supply availability, cost considerations, packaging format preference, and whether automotive certification is required. All are electrically and mechanically compatible with the RC1005F681CS.

Q: Can I use ERJ-2RKF6800X as a general replacement for all applications?

A: ERJ-2RKF6800X is suitable for all applications where the RC1005F681CS is used. The higher 0.1W power rating provides additional thermal capacity without introducing any compatibility issues. The AEC-Q200 certification adds automotive qualification but does not restrict use in non-automotive circuits. This part represents an upgrade option with enhanced specifications.

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