RCS2012J684CS Equivalent & Substitute Parts Reference

Part Overview

The RCS2012J684CS is a 680 kOhms ±5% 0.125W (1/8W) thick film chip resistor manufactured by Samsung Electro-Mechanics in 0805 (2012 Metric) package format. This component is classified as Active product status with anti-sulfur and moisture-resistant construction. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and operates across the temperature range of -55°C to 155°C. Equivalent and substitute parts are identified based on matching resistance value, power rating, package format, and electrical performance characteristics within the 0805 form factor.

Key Parameters

Parameter	Value
Resistance	680 kOhms
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 ~ 155°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RCS2012J684CS are grouped based on the following substitution criteria:

Primary Matching Parameters:

Resistance value: 680 kOhms (exact match required)
Package format: 0805 (2012 Metric) (exact match required)
Power rating: 0.125W (1/8W) (exact match required)
Composition: Thick Film (exact match required)
Temperature coefficient: ±100ppm/°C (exact match required)
Operating temperature range: -55°C ~ 155°C (exact match required)
RoHS compliance: ROHS3 Compliant (exact match required)

Secondary Consideration:

Tolerance: ±5% (primary specification) or ±1% (tighter tolerance acceptable as direct substitute)

Substitute parts meeting all primary parameters are electrically and mechanically interchangeable with the RCS2012J684CS. Parts with ±1% tolerance provide enhanced precision while maintaining full compatibility with circuit requirements specified for ±5% tolerance components.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package	Composition	Temp Coeff	Operating Temp	Height Max	RoHS Status	MSL
RCS2012J684CS	Samsung Electro-Mechanics	680 kOhms	±5%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.66mm	ROHS3	1
AC0805FR-07680KL	YAGEO	680 kOhms	±1%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.60mm	ROHS3	1
AC0805JR-07680KL	YAGEO	680 kOhms	±5%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.60mm	ROHS3	1
CRCW0805680KFKEA	Vishay Dale	680 kOhms	±1%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.50mm	ROHS3	1
ERJ-6ENF6803V	Panasonic Electronic Components	680 kOhms	±1%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.70mm	ROHS3	1
KTR10EZPF6803	Rohm Semiconductor	680 kOhms	±1%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.65mm	ROHS3	1
RC0805FR-07680KL	YAGEO	680 kOhms	±1%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.60mm	ROHS3	1
RC0805JR-07680KL	YAGEO	680 kOhms	±5%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.60mm	ROHS3	1
RMCF0805FT680K	Stackpole Electronics Inc	680 kOhms	±1%	0.125W	0805	Thick Film	±100ppm/°C	-55°C ~ 155°C	0.65mm	ROHS3	1

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance identical to the RCS2012J684CS. Selection among equivalent parts is determined by the following factors:

Tolerance Matching: AC0805JR-07680KL and RC0805JR-07680KL provide exact tolerance specification (±5%) matching the original RCS2012J684CS. These parts are direct functional equivalents with no circuit performance differentiation.

Enhanced Precision Alternatives: AC0805FR-07680KL, CRCW0805680KFKEA, ERJ-6ENF6803V, KTR10EZPF6803, RC0805FR-07680KL, and RMCF0805FT680K offer ±1% tolerance specification. These components are electrically compatible with circuits designed for ±5% tolerance and provide superior precision for applications requiring tighter resistance control.

Packaging Considerations: All substitute parts are packaged in 0805 (2012 Metric) format with identical footprint dimensions (0.079" L x 0.049" W / 2.00mm x 1.25mm). Height variations range from 0.50mm to 0.70mm maximum seated height. Component height must be verified against specific PCB assembly clearance requirements.

Automotive Applications: AC0805FR-07680KL, AC0805JR-07680KL, CRCW0805680KFKEA, ERJ-6ENF6803V, KTR10EZPF6803, and RMCF0805FT680K carry AEC-Q200 automotive qualification. These parts are suitable for automotive-grade circuit applications.

Frequently Asked Questions (FAQ)

Q: Can AC0805JR-07680KL directly replace RCS2012J684CS in production?

A: Yes. AC0805JR-07680KL matches all primary electrical and mechanical parameters: 680 kOhms ±5% tolerance, 0.125W power rating, 0805 package, thick film composition, ±100ppm/°C temperature coefficient, -55°C to 155°C operating range, and ROHS3 compliance. Direct substitution is supported without circuit redesign.

Q: What is the difference between ±5% and ±1% tolerance parts?

A: Tolerance specification defines the maximum allowable deviation from the nominal 680 kOhm resistance value. ±5% tolerance permits resistance between 646 kOhms and 714 kOhms. ±1% tolerance permits resistance between 673.2 kOhms and 686.8 kOhms. Parts with ±1% tolerance are compatible with circuits designed for ±5% tolerance and provide enhanced precision. Circuits requiring ±5% tolerance can use ±1% parts without performance degradation.

Q: Are all substitute parts suitable for automotive applications?

A: Not all. AC0805JR-07680KL, RC0805JR-07680KL, and RC0805FR-07680KL do not carry AEC-Q200 automotive qualification. AC0805FR-07680KL, CRCW0805680KFKEA, ERJ-6ENF6803V, KTR10EZPF6803, and RMCF0805FT680K are AEC-Q200 qualified. Automotive circuit applications require AEC-Q200 certified components.

Q: Does component height affect PCB assembly compatibility?

A: Component height must be verified against specific PCB assembly equipment and clearance specifications. RCS2012J684CS maximum seated height is 0.66mm. Substitute parts range from 0.50mm to 0.70mm maximum seated height. Height variations within this range are typically compatible with standard 0805 assembly processes. Verify against specific assembly equipment specifications for applications with height-critical constraints.

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

A: MSL 1 classification indicates unlimited shelf life without moisture absorption precautions. All listed substitute parts carry identical MSL 1 rating. No special moisture control procedures are required during storage, handling, or assembly for any of these components.

Q: Can ERJ-UP6F6803V substitute for RCS2012J684CS?

A: No. ERJ-UP6F6803V has 0.5W (1/2W) power rating, which differs from the 0.125W (1/8W) specification of RCS2012J684CS. Although resistance, tolerance, package, and temperature specifications match, the power rating difference disqualifies this part as a direct substitute. Power rating must match circuit design specifications.

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