RC1608J122CS Equivalent & Substitute Parts

Part Overview

The RC1608J122CS is a 1.2 kOhms ±5% 0.1W thick film chip resistor in 0603 (1608 Metric) package manufactured by Samsung Electro-Mechanics. This component is classified as Active product status with 785 pieces currently in stock. The RC1608J122CS serves as a standard general-purpose resistor for applications requiring moisture-resistant thick film construction. Equivalent and substitute parts are identified to address inventory availability, extended lead times, or specific application requirements such as improved tolerance grades or automotive-grade certifications.

Key Parameters

Parameter	Value
Resistance	1.2 kOhms
Tolerance	±5%
Power Rating	0.1W (1/10W)
Package / Case	0603 (1608 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C ~ 155°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	ROHS3 Compliant
Packaging Type	Cut Tape (CT)

Substitute Part Grouping Explanation

Substitute parts for the RC1608J122CS are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Equivalent Parameters): Parts that maintain identical resistance value (1.2 kOhms), tolerance (±5%), power rating (0.1W), package (0603), and operating temperature range (-55°C ~ 155°C). These parts are interchangeable without circuit redesign.

Upgrade Substitutes (Enhanced Tolerance): Parts that maintain the same resistance, power rating, and package but feature improved tolerance (±1% instead of ±5%). These parts provide tighter tolerance specifications while maintaining full mechanical and thermal compatibility. Upgrade substitutes also include automotive-grade variants with AEC-Q200 certification.

Key Parameters Determining Substitution:

Resistance value: 1.2 kOhms (fixed)
Power rating: 0.1W (fixed)
Package: 0603 (1608 Metric) (fixed)
Operating temperature: -55°C ~ 155°C (fixed)
Tolerance: ±5% (direct) or ±1% (upgrade)
Composition: Thick Film (fixed)
Termination count: 2 (fixed)

Parameter Comparison

Part Number	Manufacturer	Resistance	Tolerance	Power	Temp Coeff	Package	Features	Product Status	Inventory
RC1608J122CS	Samsung Electro-Mechanics	1.2 kΩ	±5%	0.1W	±100ppm/°C	0603	Moisture Resistant	Active	785 Pcs
RC0603JR-071K2L	YAGEO	1.2 kΩ	±5%	0.1W	±100ppm/°C	0603	Moisture Resistant	Active	5655 Pcs
RMCF0603JT1K20	Stackpole Electronics Inc	1.2 kΩ	±5%	0.1W	±200ppm/°C	0603	Automotive AEC-Q200	Active	135972 Pcs
ERJ-3GEYJ122V	Panasonic Electronic Components	1.2 kΩ	±5%	0.1W	±200ppm/°C	0603	Automotive AEC-Q200	Active	160390 Pcs
AC0603JR-071K2L	YAGEO	1.2 kΩ	±5%	0.1W	±100ppm/°C	0603	Automotive AEC-Q200, Moisture Resistant	Active	7445 Pcs
CRG0603F1K2	TE Connectivity Passive Product	1.2 kΩ	±1%	0.1W	±100ppm/°C	0603	—	Active	30432 Pcs
RC0603FR-071K2L	YAGEO	1.2 kΩ	±1%	0.1W	±100ppm/°C	0603	Moisture Resistant	Active	8887 Pcs
ERJ-3EKF1201V	Panasonic Electronic Components	1.2 kΩ	±1%	0.1W	±100ppm/°C	0603	Automotive AEC-Q200	Active	147252 Pcs
RMCF0603FT1K20	Stackpole Electronics Inc	1.2 kΩ	±1%	0.1W	±100ppm/°C	0603	Automotive AEC-Q200	Active	129625 Pcs
MCR03ERTF1201	Rohm Semiconductor	1.2 kΩ	±1%	0.1W	±100ppm/°C	0603	—	Discontinued at DiGi Electronics	648 Pcs

Engineering Selection Recommendations

For Direct Equivalent Selection (±5% Tolerance):

RC0603JR-071K2L (YAGEO) is the primary direct substitute. This part maintains identical electrical specifications (1.2 kΩ ±5%, 0.1W, ±100ppm/°C) and mechanical compatibility (0603 package, moisture resistant). Inventory availability is significantly higher (5655 pieces) compared to the main part. Both parts are Active status and ROHS3 compliant.

RMCF0603JT1K20 (Stackpole Electronics Inc) and ERJ-3GEYJ122V (Panasonic Electronic Components) are functionally equivalent alternatives with automotive AEC-Q200 certification. These parts are suitable for applications requiring automotive-grade reliability. Temperature coefficient differs at ±200ppm/°C. Inventory levels are substantially higher (135972 and 160390 pieces respectively).

AC0603JR-071K2L (YAGEO) combines moisture resistance with automotive AEC-Q200 certification while maintaining ±5% tolerance and ±100ppm/°C temperature coefficient. This part is suitable for automotive applications requiring moisture-resistant construction.

For Upgraded Tolerance Selection (±1% Tolerance):

RC0603FR-071K2L (YAGEO) provides improved ±1% tolerance while retaining moisture resistance and identical temperature coefficient (±100ppm/°C). This upgrade is suitable for precision circuit applications requiring tighter component tolerances.

ERJ-3EKF1201V (Panasonic Electronic Components) and RMCF0603FT1K20 (Stackpole Electronics Inc) offer ±1% tolerance with automotive AEC-Q200 certification. These parts are appropriate for automotive applications requiring precision resistor specifications.

CRG0603F1K2 (TE Connectivity Passive Product) provides ±1% tolerance with the highest inventory availability (30432 pieces) among upgrade options. This part is suitable for high-volume production requiring precision specifications.

Parts to Avoid:

MCR03ERTF1201 (Rohm Semiconductor) is discontinued at DiGi Electronics and should not be selected for new designs despite adequate remaining inventory (648 pieces).

Frequently Asked Questions (FAQ)

Q: Can RC0603JR-071K2L directly replace RC1608J122CS without circuit modification?

A: Yes. RC0603JR-071K2L maintains identical resistance (1.2 kΩ), tolerance (±5%), power rating (0.1W), package (0603), and operating temperature range (-55°C ~ 155°C). Both parts are thick film, moisture-resistant components with equivalent electrical performance.

Q: What is the difference between direct substitutes and upgrade substitutes?

A: Direct substitutes maintain ±5% tolerance matching the original part. Upgrade substitutes feature improved ±1% tolerance, providing tighter resistance specifications. Upgrade substitutes are electrically compatible but offer enhanced precision for applications requiring closer tolerance control.

Q: Are automotive-grade parts (AEC-Q200) compatible with non-automotive applications?

A: Yes. Automotive-grade parts meet or exceed general-purpose specifications and are fully compatible with non-automotive circuits. AEC-Q200 certification indicates enhanced reliability testing and qualification standards. These parts can be used in any application where the original part is specified.

Q: What is the significance of temperature coefficient differences (±100ppm/°C vs ±200ppm/°C)?

A: Temperature coefficient indicates resistance change per degree Celsius. Lower values (±100ppm/°C) indicate more stable resistance across temperature variations. For most general-purpose applications, both specifications are acceptable. Precision circuits may require the lower ±100ppm/°C specification.

Q: Can I use a ±1% tolerance part where ±5% is specified?

A: Yes. A ±1% tolerance part is a superior specification and is fully compatible with circuits designed for ±5% tolerance. The tighter tolerance provides improved circuit performance without requiring design changes.

Q: What packaging options are available for these substitutes?

A: The main part (RC1608J122CS) is supplied in Cut Tape (CT) packaging. Substitute parts are available in Cut Tape (CT) and Digi-Reel® or Tape & Reel (TR) formats. Verify packaging compatibility with your assembly process before selection.

Q: Are all listed parts ROHS3 compliant?

A: All active parts listed are ROHS3 compliant. MCR03ERTF1201 is also ROHS3 compliant but is discontinued and should not be selected for new designs.

Q: What is Moisture Sensitivity Level (MSL) 1?

A: MSL 1 indicates unlimited shelf life without moisture exposure precautions. All listed parts carry MSL 1 rating, requiring no special moisture control during storage or handling.

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