Equivalent & Substitute Parts for RC2012J684CS

Part Overview

The RC2012J684CS is a 680 kOhms ±5% 0.125W thick film chip resistor in 0805 (2012 Metric) package manufactured by Samsung Electro-Mechanics. This component is classified as Active product status with moisture-resistant properties and ROHS3 compliance. The part is supplied in Tape & Reel packaging with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the original manufacturer part becomes unavailable, when design requirements demand enhanced specifications such as tighter tolerance or automotive qualification, or when supply chain optimization requires alternative sourcing from qualified manufacturers.

Key Parameters

Parameter	Value	Criticality for Substitution
Resistance Value	680 kOhms	Critical - Must match exactly
Tolerance	±5%	Critical - Defines acceptable variance
Power Rating	0.125W (1/8W)	Critical - Minimum thermal requirement
Package Type	0805 (2012 Metric)	Critical - PCB footprint compatibility
Composition	Thick Film	Critical - Electrical characteristics
Temperature Coefficient	±100ppm/°C	Important - Temperature stability
Operating Temperature Range	-55°C to 155°C	Important - Environmental limits
RoHS Status	ROHS3 Compliant	Important - Regulatory requirement
Moisture Sensitivity Level	MSL 1 (Unlimited)	Important - Storage and handling

Substitute Part Grouping Explanation

Substitute parts for the RC2012J684CS are categorized into three groups based on electrical and mechanical compatibility:

Direct Substitutes (Equivalent Specifications): Parts with identical resistance value (680 kOhms), tolerance (±5%), power rating (0.125W), package (0805), composition (thick film), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C to 155°C). These parts maintain all original electrical and thermal characteristics.

Upgrade Substitutes (Enhanced Specifications): Parts with identical resistance, power rating, package, and operating temperature range, but with improved tolerance (±1% instead of ±5%). These parts provide tighter tolerance performance while maintaining backward compatibility. Some upgrade substitutes include automotive AEC-Q200 qualification or additional features such as high voltage capability.

Similar Parts (Modified Specifications): Parts with identical resistance, tolerance, package, and operating temperature range, but with different power ratings (0.333W instead of 0.125W) or different feature sets. These parts are functionally compatible but with enhanced thermal capacity or different application focus.

The key parameters determining substitution eligibility are: resistance value, tolerance grade, power rating, package type, composition type, temperature coefficient, and operating temperature range. All substitute parts maintain ROHS3 compliance and MSL 1 rating.

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp (°C)	Features	Product Status
RC2012J684CS	Samsung Electro-Mechanics	680 kΩ	±5%	0.125	0805	±100ppm/°C	-55 to 155	Moisture Resistant	Active
RC0805JR-07680KL	YAGEO	680 kΩ	±5%	0.125	0805	±100ppm/°C	-55 to 155	Moisture Resistant	Active
AC0805FR-07680KL	YAGEO	680 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155	Automotive AEC-Q200, Moisture Resistant	Active
ERJ-6ENF6803V	Panasonic Electronic Components	680 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155	Automotive AEC-Q200	Active
KTR10EZPF6803	Rohm Semiconductor	680 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155	Automotive AEC-Q200, High Voltage	Active
MCR10ERTF6803	Rohm Semiconductor	680 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155	None listed	Discontinued at DiGi Electronics
RC0805FR-07680KL	YAGEO	680 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155	Moisture Resistant	Active
RMCF0805FT680K	Stackpole Electronics Inc	680 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155	Automotive AEC-Q200	Active
AC0805JR-07680KL	YAGEO	680 kΩ	±5%	0.125	0805	±100ppm/°C	-55 to 155	Automotive AEC-Q200, Moisture Resistant	Active
CRCW0805680KFKEA	Vishay Dale	680 kΩ	±1%	0.125	0805	±100ppm/°C	-55 to 155	Automotive AEC-Q200	Active
CRGH0805J680K	TE Connectivity Passive Product	680 kΩ	±5%	0.333	0805	±100ppm/°C	-55 to 155	None listed	Active

Engineering Selection Recommendations

For Direct Equivalent Replacement: Select RC0805JR-07680KL from YAGEO or AC0805JR-07680KL from YAGEO. Both parts maintain the original ±5% tolerance specification and are classified as Active products. RC0805JR-07680KL provides standard moisture-resistant thick film construction. AC0805JR-07680KL adds automotive AEC-Q200 qualification while maintaining the same tolerance and power rating, suitable for applications requiring automotive-grade reliability.

For Upgraded Performance: Select from AC0805FR-07680KL (YAGEO), ERJ-6ENF6803V (Panasonic), RMCF0805FT680K (Stackpole), or CRCW0805680KFKEA (Vishay Dale). All upgrade substitutes feature ±1% tolerance, providing tighter resistance accuracy. All are Active products with ROHS3 compliance. AC0805FR-07680KL and RMCF0805FT680K include automotive AEC-Q200 qualification. ERJ-6ENF6803V and CRCW0805680KFKEA also carry AEC-Q200 rating. These parts are suitable for applications where improved tolerance performance is required without changing the thermal or package specifications.

For High-Voltage Applications: Select KTR10EZPF6803 from Rohm Semiconductor. This part combines ±1% tolerance with high-voltage capability and automotive AEC-Q200 qualification, maintaining all other electrical and thermal parameters.

Avoid: MCR10ERTF6803 from Rohm Semiconductor is listed as Discontinued at DiGi Electronics and should not be selected for new designs.

For Enhanced Thermal Capacity: Select CRGH0805J680K from TE Connectivity. This part provides 0.333W power rating (compared to 0.125W standard) while maintaining ±5% tolerance and all other electrical parameters. Use only when thermal requirements exceed the standard 0.125W rating.

Frequently Asked Questions (FAQ)

Q: Can I substitute RC0805JR-07680KL for RC2012J684CS without design changes?

A: Yes. RC0805JR-07680KL is a direct equivalent with identical resistance (680 kOhms), tolerance (±5%), power rating (0.125W), package (0805), temperature coefficient (±100ppm/°C), and operating temperature range (-55°C to 155°C). Both are thick film, moisture-resistant, ROHS3 compliant, and MSL 1 rated. No PCB layout or circuit modifications are required.

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

A: Tolerance defines the acceptable variance from the nominal resistance value. The RC2012J684CS with ±5% tolerance allows resistance values between 646 kOhms and 714 kOhms. Upgrade substitutes with ±1% tolerance allow values between 673.2 kOhms and 686.8 kOhms, providing significantly tighter accuracy. Select ±1% parts when circuit performance requires precise resistance values or when tolerance stack-up across multiple resistors must be minimized.

Q: Are automotive AEC-Q200 qualified parts backward compatible with standard applications?

A: Yes. Automotive AEC-Q200 qualified parts such as AC0805FR-07680KL, ERJ-6ENF6803V, RMCF0805FT680K, and CRCW0805680KFKEA meet or exceed standard industrial specifications. These parts can be used in non-automotive applications without functional issues. AEC-Q200 qualification indicates enhanced reliability testing and stricter manufacturing controls, making these parts suitable for demanding environments.

Q: Can I use CRGH0805J680K (0.333W) in place of RC2012J684CS (0.125W)?

A: CRGH0805J680K is physically compatible in the 0805 package footprint and maintains all electrical parameters except power rating. Use this part only if your circuit requires higher thermal capacity. The higher power rating does not degrade performance in applications designed for 0.125W; however, it may result in unnecessary cost and board space considerations. Verify that the higher power rating does not conflict with thermal design constraints.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. Both the original RC2012J684CS and all substitute parts listed carry MSL 1 rating, meaning they can be stored at standard ambient conditions without desiccant packaging or moisture bake-out procedures prior to soldering.

Q: Why is MCR10ERTF6803 listed but marked as discontinued?

A: MCR10ERTF6803 is included in the substitute list for reference purposes only, showing historical availability. This part is discontinued at DiGi Electronics and should not be selected for new designs or procurement. Use active alternatives such as RMCF0805FT680K or KTR10EZPF6803 from Rohm Semiconductor instead.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Most substitute parts are available in Tape & Reel (TR) packaging, matching the original RC2012J684CS. RC0805FR-07680KL and CRCW0805680KFKEA are available in Cut Tape (CT) & Digi-Reel® packaging. Verify packaging format with your supplier to ensure compatibility with your assembly process requirements.

Q: What is the height difference between substitute parts, and does it matter?

A: Height variations range from 0.020" (0.50mm) for CRCW0805680KFKEA to 0.028" (0.70mm) for ERJ-6ENF6803V, compared to 0.026" (0.65mm) for the original RC2012J684CS. These variations are within typical 0805 package tolerances and do not affect PCB assembly or electrical performance. Height differences become relevant only in space-constrained applications with minimal clearance above the component.

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