RCS2012J681CS Equivalent & Substitute Parts Reference

Part Overview

The RCS2012J681CS is a 680 Ohm ±5% thick film chip resistor manufactured by Samsung Electro-Mechanics, rated at 0.125W (1/8W) in 0805 (2012 Metric) package format. This component features anti-sulfur and moisture-resistant construction with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The part is currently in active production status with 965 pieces available in inventory. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and environmental ratings to ensure direct circuit board compatibility and functional interchangeability.

Key Parameters

Parameter	Value
Resistance	680 Ohms
Tolerance	±5%
Power Rating	0.125W (1/8W)
Package / Case	0805 (2012 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 155°C
Size / Dimension	0.079" L x 0.049" W (2.00mm x 1.25mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RCS2012J681CS are grouped based on the following critical parameters that determine functional interchangeability:

Primary Matching Criteria:

Resistance value: 680 Ohms (exact match required)
Package format: 0805 (2012 Metric) (exact match required)
Operating temperature range: -55°C to 155°C (exact match required)
Composition: Thick Film (exact match required)
Temperature coefficient: ±100ppm/°C (exact match required)
RoHS3 compliance and MSL 1 rating (exact match required)

Secondary Variation Parameters:

Tolerance: ±5% (main part) or ±1% (substitute options available)
Power rating: 0.125W (1/8W) primary, or 0.5W (1/2W) for higher power applications
Packaging format: Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel®
Manufacturer certifications: AEC-Q200 automotive qualification (optional enhancement)
Additional features: Anti-sulfur, moisture resistant, pulse withstanding capabilities

Substitutes are valid when all primary matching criteria are met. Tolerance upgrades from ±5% to ±1% represent improved precision without functional compromise. Power rating increases from 0.125W to 0.5W provide additional thermal margin. Automotive AEC-Q200 certification indicates enhanced reliability for demanding applications.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp (°C)	Height Max (mm)	RoHS3	MSL	AEC-Q200
RCS2012J681CS	Samsung Electro-Mechanics	680Ω	±5%	0.125	0805	±100ppm/°C	-55 to 155	0.66	Yes	1	No
AC0805FR-07680RL	YAGEO	680Ω	±1%	0.125	0805	±100ppm/°C	-55 to 155	0.60	Yes	1	Yes
AC0805JR-07680RL	YAGEO	680Ω	±5%	0.125	0805	±100ppm/°C	-55 to 155	0.60	Yes	1	Yes
CRCW0805680RFKEA	Vishay Dale	680Ω	±1%	0.125	0805	±100ppm/°C	-55 to 155	0.50	Yes	1	Yes
CRCW0805680RFKEAHP	Vishay Dale	680Ω	±1%	0.5	0805	±100ppm/°C	-55 to 155	0.50	Yes	1	Yes
ERJ-6ENF6800V	Panasonic Electronic Components	680Ω	±1%	0.125	0805	±100ppm/°C	-55 to 155	0.70	Yes	1	Yes
ERJ-UP6F6800V	Panasonic Electronic Components	680Ω	±1%	0.5	0805	±100ppm/°C	-55 to 155	0.70	Yes	1	Yes
RC0805FR-07680RL	YAGEO	680Ω	±1%	0.125	0805	±100ppm/°C	-55 to 155	0.60	Yes	1	No
RC0805JR-07680RL	YAGEO	680Ω	±5%	0.125	0805	±100ppm/°C	-55 to 155	0.60	Yes	1	No
RCS0805680RFKEA	Vishay Dale	680Ω	±1%	0.5	0805	±100ppm/°C	-55 to 155	0.50	Yes	1	Yes
RMCF0805FT680R	Stackpole Electronics Inc	680Ω	±1%	0.125	0805	±100ppm/°C	-55 to 155	0.65	Yes	1	Yes

Engineering Selection Recommendations

Direct Equivalents (±5% Tolerance, 0.125W):

AC0805JR-07680RL and RC0805JR-07680RL are direct functional equivalents to RCS2012J681CS, maintaining identical electrical specifications and power rating. Both parts carry ROHS3 compliance and MSL 1 rating. AC0805JR-07680RL includes AEC-Q200 automotive qualification, providing enhanced reliability for automotive and industrial applications. RC0805JR-07680RL offers equivalent performance without automotive certification. Both are available in high inventory quantities.

Precision Upgrades (±1% Tolerance, 0.125W):

AC0805FR-07680RL, CRCW0805680RFKEA, ERJ-6ENF6800V, RC0805FR-07680RL, and RMCF0805FT680R provide improved tolerance specification at ±1% while maintaining 0.125W power rating and 0805 package format. These parts are suitable for applications requiring tighter resistance tolerances. AC0805FR-07680RL, CRCW0805680RFKEA, ERJ-6ENF6800V, and RMCF0805FT680R carry AEC-Q200 certification for automotive applications. RC0805FR-07680RL does not include automotive certification but maintains full ROHS3 and MSL 1 compliance.

Higher Power Options (0.5W, 1/2W):

CRCW0805680RFKEAHP, ERJ-UP6F6800V, and RCS0805680RFKEA provide increased power dissipation capability at 0.5W (1/2W) rating while maintaining 680 Ohm resistance and ±1% tolerance. These parts are applicable to circuits requiring additional thermal margin or higher power handling. All three carry AEC-Q200 automotive qualification and full ROHS3 compliance. ERJ-UP6F6800V includes anti-sulfur and pulse withstanding features.

Inventory and Availability:

All substitute parts maintain active production status. YAGEO RC0805FR-07680RL offers the highest inventory availability at 500,200 pieces. Stackpole RMCF0805FT680R provides 342,887 pieces. Panasonic ERJ-6ENF6800V stocks 182,406 pieces. Vishay Dale CRCW0805680RFKEAHP maintains 98,161 pieces. All parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8533.21.0030.

Frequently Asked Questions (FAQ)

Q: Can I substitute RCS2012J681CS with a ±1% tolerance part?

A: Yes. Parts with ±1% tolerance (AC0805FR-07680RL, CRCW0805680RFKEA, ERJ-6ENF6800V, RC0805FR-07680RL, RMCF0805FT680R) are direct substitutes. The ±1% tolerance represents improved precision and is functionally compatible with circuits designed for ±5% tolerance components. No circuit redesign is required.

Q: What is the difference between 0.125W and 0.5W rated parts?

A: Power rating indicates maximum continuous power dissipation capability. A 0.5W part can safely dissipate more heat than a 0.125W part in the same 0805 package. Substituting a 0.5W part (CRCW0805680RFKEAHP, ERJ-UP6F6800V, RCS0805680RFKEA) for a 0.125W part provides additional thermal margin and is functionally compatible. The reverse substitution (0.125W for 0.5W) is not recommended if the circuit requires 0.5W capability.

Q: Are AEC-Q200 certified parts required for my application?

A: AEC-Q200 certification indicates automotive-grade reliability and enhanced qualification testing. Parts with AEC-Q200 certification (AC0805FR-07680RL, AC0805JR-07680RL, CRCW0805680RFKEA, CRCW0805680RFKEAHP, ERJ-6ENF6800V, ERJ-UP6F6800V, RCS0805680RFKEA, RMCF0805FT680R) are suitable for automotive, industrial, and high-reliability applications. Parts without AEC-Q200 certification (RC0805FR-07680RL, RC0805JR-07680RL) are suitable for general-purpose consumer and commercial applications. Selection depends on application requirements and design specifications.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: Tape & Reel packaging is supplied on continuous carrier tape suitable for automated pick-and-place assembly equipment. Cut Tape & Digi-Reel® packaging is supplied in smaller quantities on cut tape segments. Both formats contain identical components. Selection depends on manufacturing process requirements and order quantities. RCS2012J681CS is supplied in Tape & Reel format.

Q: Can I use RC0805JR-07680RL as a direct replacement for RCS2012J681CS?

A: Yes. RC0805JR-07680RL is a direct functional equivalent with identical 680 Ohm resistance, ±5% tolerance, 0.125W power rating, and 0805 package format. Both parts operate across -55°C to 155°C temperature range with ±100ppm/°C temperature coefficient. Both are ROHS3 compliant with MSL 1 rating. The primary difference is manufacturer (YAGEO versus Samsung Electro-Mechanics) and optional AEC-Q200 automotive certification on the YAGEO part.

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

A: MSL 1 indicates unlimited shelf life without moisture baking requirements. Components rated MSL 1 can be stored indefinitely at standard conditions without special moisture control measures. All listed substitute parts maintain MSL 1 rating, ensuring compatibility with standard component storage and handling procedures.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification. RCS2012J681CS and all equivalent and substitute parts are free from restricted substances (lead, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, and bis(2-ethylhexyl) phthalate) as specified in ROHS3 regulations.

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