RC1005F123CS Equivalent & Substitute Parts Reference

Part Overview

The RC1005F123CS is a 12 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in the 0402 (1005 Metric) package format. This surface mount device (SMD) is rated at 0.063W (1/16W) power dissipation with moisture resistant characteristics and operates across the temperature range of -55°C to 155°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and package compatibility to ensure direct circuit board replacement capability.

Key Parameters

Parameter	Value
Resistance	12 kOhms
Tolerance	±1%
Power Rating	0.063W (1/16W)
Package / Case	0402 (1005 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 155°C
Size / Dimension	0.039" L x 0.020" W (1.00mm x 0.50mm)
Height - Seated (Max)	0.016" (0.40mm)
Number of Terminations	2
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the RC1005F123CS are classified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Core Matching Parameters:

Resistance value: 12 kOhms
Tolerance: ±1%
Package format: 0402 (1005 Metric)
Composition: Thick Film
Temperature coefficient: ±100ppm/°C
Operating temperature range: -55°C to 155°C
Number of terminations: 2

Substitution Categories:

Direct Equivalents maintain identical electrical specifications and power rating (0.063W / 1/16W) with full parameter compatibility:

CR0402-FX-1202GLF (Bourns Inc.)
CRG0402F12K (TE Connectivity Passive Product)
RC0402FR-0712KL (YAGEO)

Upgrade Option provides higher power rating (0.1W / 1/10W) with automotive qualification:

ERJ-2RKF1202X (Panasonic Electronic Components)

Similar Parts match core electrical and mechanical specifications with additional features such as automotive AEC-Q200 certification or anti-sulfur treatment:

AC0402FR-0712KL (YAGEO)
AF0402FR-0712KL (YAGEO)
CRCW040212K0FKED (Vishay Dale)
CRCW040212K0FKTD (Vishay Dale)
RMCF0402FT12K0 (Stackpole Electronics Inc)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (Watts)	Package / Case	Temperature Coefficient	Operating Temperature	Size / Dimension	Height - Seated (Max)	RoHS Status	MSL	Packaging Type
RC1005F123CS	Samsung Electro-Mechanics	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.016" (0.40mm)	ROHS3 Compliant	1	Cut Tape (CT)
CR0402-FX-1202GLF	Bourns Inc.	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.016" (0.40mm)	ROHS3 Compliant	1	Tape & Reel (TR)
CRG0402F12K	TE Connectivity Passive Product	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.016" (0.40mm)	ROHS3 Compliant	1	Tape & Reel (TR)
RC0402FR-0712KL	YAGEO	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.016" (0.40mm)	ROHS3 Compliant	1	Cut Tape (CT) & Digi-Reel®
ERJ-2RKF1202X	Panasonic Electronic Components	12 kOhms	±1%	0.1W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.016" (0.40mm)	ROHS3 Compliant	1	Cut Tape (CT) & Digi-Reel®
AC0402FR-0712KL	YAGEO	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.015" (0.37mm)	ROHS3 Compliant	1	Cut Tape (CT) & Digi-Reel®
AF0402FR-0712KL	YAGEO	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.015" (0.37mm)	ROHS3 Compliant	1	Tape & Reel (TR)
CRCW040212K0FKED	Vishay Dale	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.016" (0.40mm)	ROHS3 Compliant	1	Cut Tape (CT) & Digi-Reel®
CRCW040212K0FKTD	Vishay Dale	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.016" (0.40mm)	RoHS non-compliant	1	Tape & Reel (TR)
RMCF0402FT12K0	Stackpole Electronics Inc	12 kOhms	±1%	0.063W	0402 (1005 Metric)	±100ppm/°C	-55°C ~ 155°C	0.039" L x 0.020" W (1.00mm x 0.50mm)	0.016" (0.40mm)	ROHS3 Compliant	1	Tape & Reel (TR)

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

CR0402-FX-1202GLF, CRG0402F12K, and RC0402FR-0712KL are direct electrical and mechanical equivalents to the RC1005F123CS. All three parts maintain the 12 kOhms ±1% resistance, 0.063W power rating, 0402 package format, and ROHS3 compliance. These parts are suitable for one-to-one substitution in applications where the original part is unavailable. RC0402FR-0712KL offers the highest inventory availability (5,000,200 pcs) among direct equivalents.

For Applications Requiring Higher Power Dissipation:

ERJ-2RKF1202X provides an upgrade path with increased power rating of 0.1W (1/10W) while maintaining all other electrical parameters. This part includes Automotive AEC-Q200 certification and is suitable for circuits requiring enhanced thermal performance. The higher power rating does not affect circuit functionality in applications designed for the standard 0.063W rating.

For Automotive and Enhanced Reliability Applications:

AC0402FR-0712KL, AF0402FR-0712KL, CRCW040212K0FKED, and RMCF0402FT12K0 all carry Automotive AEC-Q200 certification. AF0402FR-0712KL additionally includes anti-sulfur treatment. These parts are appropriate for automotive-grade circuit designs and applications requiring enhanced environmental protection. All maintain ROHS3 compliance except CRCW040212K0FKTD, which is RoHS non-compliant and REACH affected.

Compliance Considerations:

All recommended direct equivalents and upgrades maintain ROHS3 compliance and REACH unaffected status, matching the original RC1005F123CS specifications. CRCW040212K0FKTD should be avoided in applications requiring RoHS3 compliance or REACH compliance.

Packaging Format Selection:

Cut Tape (CT) packaging is suitable for manual assembly and small-volume production. Tape & Reel (TR) packaging is optimized for automated pick-and-place assembly. Selection between packaging formats depends on manufacturing process requirements rather than electrical performance.

Frequently Asked Questions (FAQ)

Q: Can CR0402-FX-1202GLF be used as a direct replacement for RC1005F123CS?

A: Yes. CR0402-FX-1202GLF is a direct equivalent with identical resistance (12 kOhms), tolerance (±1%), power rating (0.063W), package format (0402), temperature coefficient (±100ppm/°C), operating temperature range (-55°C to 155°C), and ROHS3 compliance. The only difference is the packaging format (Tape & Reel vs. Cut Tape), which does not affect electrical performance.

Q: What is the difference between the 0.063W and 0.1W power ratings?

A: Power rating indicates the maximum continuous power dissipation the resistor can handle without exceeding temperature limits. The 0.1W rating of ERJ-2RKF1202X provides higher thermal capacity than the 0.063W rating of the RC1005F123CS. In circuits designed for 0.063W dissipation, either rating functions identically. The higher rating is beneficial in applications with marginal thermal design or potential power surges.

Q: Are all substitute parts suitable for automotive applications?

A: Not all. Only AC0402FR-0712KL, AF0402FR-0712KL, ERJ-2RKF1202X, CRCW040212K0FKED, CRCW040212K0FKTD, and RMCF0402FT12K0 carry Automotive AEC-Q200 certification. The RC1005F123CS, CR0402-FX-1202GLF, CRG0402F12K, and RC0402FR-0712KL do not have automotive certification and should not be used in automotive-grade designs unless the circuit design does not require AEC-Q200 qualification.

Q: What does MSL 1 (Unlimited) mean?

A: Moisture Sensitivity Level 1 indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. All listed substitute parts maintain MSL 1 rating, ensuring compatibility with standard component storage and assembly processes.

Q: Can I substitute a part with different packaging (Cut Tape vs. Tape & Reel)?

A: Yes, from an electrical and mechanical standpoint. Both packaging formats contain identical components. The choice depends on manufacturing equipment and assembly process. Cut Tape is suitable for manual or small-batch assembly. Tape & Reel is optimized for automated assembly lines. The component itself functions identically regardless of packaging format.

Q: Why is CRCW040212K0FKTD marked as RoHS non-compliant?

A: CRCW040212K0FKTD does not meet ROHS3 compliance requirements and is REACH affected. This part should not be used in applications or markets requiring RoHS3 compliance. Use CRCW040212K0FKED instead, which is the RoHS3 compliant equivalent from the same manufacturer.

Q: Are all substitute parts available in the same quantities?

A: No. Inventory levels vary significantly. RC0402FR-0712KL has the highest availability (5,000,200 pcs), while AC0402FR-0712KL has the lowest (2,300 pcs). Inventory status should be verified at the time of procurement, as availability is subject to change.

Q: What is the temperature coefficient ±100ppm/°C specification?

A: Temperature coefficient indicates how much the resistance value changes with temperature. ±100ppm/°C means the resistance can change by up to 100 parts per million for each degree Celsius change in operating temperature. All listed parts share this specification, ensuring consistent thermal performance across the operating range of -55°C to 155°C.

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