Equivalent & Substitute Parts for RC1608J681CS

Part Overview

The RC1608J681CS is a 680 Ohms ±5% 0.1W thick film chip resistor manufactured by Samsung Electro-Mechanics in 0603 (1608 Metric) package format. This component is classified as Active product status with moisture resistant properties and RoHS3 compliance. Substitute parts are necessary when the original manufacturer part becomes unavailable, when alternative packaging formats are required, or when enhanced specifications such as improved tolerance or automotive qualification are needed for specific applications.

Key Parameters

Parameter	Value
Resistance	680 Ohms
Tolerance	±5%
Power Rating	0.1W (1/10W)
Package / Case	0603 (1608 Metric)
Composition	Thick Film
Operating Temperature Range	-55°C ~ 155°C
Temperature Coefficient	±100ppm/°C
Moisture Sensitivity Level	1 (Unlimited)
RoHS Status	RoHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the RC1608J681CS are classified into three categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Specifications): Parts that match all critical parameters including 680 Ohms resistance, ±5% tolerance, 0.1W power rating, 0603 package, and -55°C to 155°C operating temperature range. These parts maintain the same electrical performance and physical form factor.

Upgrade Substitutes (Enhanced Tolerance): Parts that maintain 680 Ohms resistance, 0.1W power rating, and 0603 package but feature improved ±1% tolerance instead of ±5%. These parts provide tighter resistance accuracy while maintaining full electrical and thermal compatibility.

Upgrade Substitutes (Automotive Qualified): Parts that maintain core electrical specifications but add AEC-Q200 automotive qualification. These include both ±1% and ±5% tolerance variants with automotive-grade reliability ratings.

The substitution logic is strictly based on: resistance value match (680 Ohms), power rating compatibility (0.1W), package format (0603), operating temperature range (-55°C to 155°C), and composition (thick film). Tolerance improvements and automotive certifications represent enhancements rather than deviations from the original specification.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power	Package	Temp Coeff	Operating Temp	Features	Product Status
RC1608J681CS	Samsung Electro-Mechanics	680 Ω	±5%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active
RC0603JR-07680RL	YAGEO	680 Ω	±5%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active
ERJ-3EKF6800V	Panasonic Electronic Components	680 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active
ERJ-3GEYJ681V	Panasonic Electronic Components	680 Ω	±5%	0.1W	0603	±200ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active
KTR03EZPF6800	Rohm Semiconductor	680 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, High Voltage	Active
MCR03ERTF6800	Rohm Semiconductor	680 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	None Listed	Discontinued at DiGi Electronics
RC0603FR-07680RL	YAGEO	680 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Moisture Resistant	Active
RMCF0603FT680R	Stackpole Electronics Inc	680 Ω	±1%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active
RMCF0603JT680R	Stackpole Electronics Inc	680 Ω	±5%	0.1W	0603	±200ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200	Active
AC0603JR-07680RL	YAGEO	680 Ω	±5%	0.1W	0603	±100ppm/°C	-55°C ~ 155°C	Automotive AEC-Q200, Moisture Resistant	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): RC0603JR-07680RL from YAGEO is the primary direct substitute for RC1608J681CS. Both parts share identical electrical specifications: 680 Ohms ±5% tolerance, 0.1W power rating, ±100ppm/°C temperature coefficient, and -55°C to 155°C operating range. Both feature moisture resistant thick film construction and RoHS3 compliance. YAGEO RC0603JR-07680RL maintains Active product status with higher inventory availability (2206 pcs) compared to the original part.

For Tolerance Upgrade (±1% Specification): RC0603FR-07680RL from YAGEO provides improved ±1% tolerance while maintaining all other electrical and thermal parameters identical to the original. This part is suitable when circuit design requires tighter resistance accuracy. RC0603FR-07680RL is Active status with substantial inventory (500400 pcs). Alternative ±1% options include ERJ-3EKF6800V from Panasonic and RMCF0603FT680R from Stackpole Electronics, both with AEC-Q200 automotive qualification.

For Automotive Applications: When AEC-Q200 automotive qualification is required, select from: ERJ-3EKF6800V (Panasonic, ±1% tolerance), ERJ-3GEYJ681V (Panasonic, ±5% tolerance), RMCF0603JT680R (Stackpole, ±5% tolerance), or RMCF0603FT680R (Stackpole, ±1% tolerance). All maintain the 0603 package and -55°C to 155°C operating range. KTR03EZPF6800 from Rohm Semiconductor adds high voltage capability with ±1% tolerance and AEC-Q200 rating.

Avoid: MCR03ERTF6800 from Rohm Semiconductor is discontinued at DiGi Electronics and should not be selected for new designs despite meeting electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can RC0603JR-07680RL directly replace RC1608J681CS without circuit modification? A: Yes. RC0603JR-07680RL from YAGEO is electrically and mechanically identical to RC1608J681CS. Both are 680 Ohms ±5%, 0.1W, 0603 package, with -55°C to 155°C operating range and ±100ppm/°C temperature coefficient. No circuit redesign is required.

Q: What is the difference between ±5% and ±1% tolerance parts? A: Tolerance specifies the maximum deviation from the nominal 680 Ohm resistance value. ±5% tolerance allows resistance between 646 and 714 Ohms. ±1% tolerance restricts resistance between 673 and 687 Ohms. Select ±1% parts when circuit performance requires tighter resistance accuracy. Both tolerance grades are electrically compatible in the 0603 package.

Q: Are automotive AEC-Q200 qualified parts suitable for non-automotive applications? A: Yes. AEC-Q200 qualification represents enhanced reliability testing and quality standards. Parts meeting AEC-Q200 (such as ERJ-3EKF6800V, RMCF0603JT680R, or AC0603JR-07680RL) are fully compatible with non-automotive circuits and provide equivalent or superior performance compared to non-qualified alternatives.

Q: What packaging formats are available for 680 Ohm 0603 resistors? A: The provided substitute parts are available in two packaging formats: Cut Tape (CT) and Digi-Reel for component-level procurement, or Tape & Reel (TR) for high-volume manufacturing. Physical dimensions remain identical at 0.063" L x 0.031" W (1.60mm x 0.80mm) across all parts. Select packaging based on procurement volume and assembly requirements.

Q: Can I use RMCF0603JT680R (±5%, ±200ppm/°C) instead of RC1608J681CS (±5%, ±100ppm/°C)? A: RMCF0603JT680R is electrically compatible but has a higher temperature coefficient (±200ppm/°C versus ±100ppm/°C). This means resistance changes more significantly with temperature variations. Use RMCF0603JT680R only if circuit design tolerates the increased temperature sensitivity. For applications requiring ±100ppm/°C performance, select RC0603JR-07680RL or AC0603JR-07680RL instead.

Q: Is moisture resistance a critical parameter for substitution? A: Moisture resistance is a feature, not a substitution requirement. RC1608J681CS and RC0603JR-07680RL both include moisture resistant properties. Parts without explicit moisture resistant designation (such as MCR03ERTF6800) remain electrically compatible but may have different environmental performance characteristics. Verify moisture resistance requirements based on application environment.

Q: What is the significance of RoHS3 compliance? A: All listed substitute parts maintain RoHS3 compliance, indicating compliance with Restriction of Hazardous Substances regulations. This is a regulatory requirement for most commercial and industrial applications. All parts in this comparison meet this standard.

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