Equivalent & Substitute Parts for RC1608F2102CS

Part Overview

The RC1608F2102CS is a 21 kOhms ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0603 (1608 Metric) package format. This component is rated for 0.1W (1/10W) power dissipation with moisture-resistant construction and operates across the temperature range of -55°C to 155°C. The part maintains Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary manufacturer part becomes unavailable, when supply chain optimization is required, or when design specifications permit alternative qualified sources. Substitute parts must maintain electrical equivalence across resistance value, tolerance, power rating, and temperature coefficient while meeting the same environmental and compliance standards.

Key Parameters

Parameter	Value	Criticality for Substitution
Resistance Value	21 kOhms	Critical - Must Match Exactly
Tolerance	±1%	Critical - Must Match Exactly
Power Rating	0.1W (1/10W)	Critical - Must Match or Exceed
Package / Case	0603 (1608 Metric)	Critical - Must Match Exactly
Temperature Coefficient	±100ppm/°C	Critical - Must Match Exactly
Operating Temperature Range	-55°C ~ 155°C	Critical - Must Match or Exceed
Composition	Thick Film	Critical - Must Match Exactly
RoHS Status	ROHS3 Compliant	Critical - Must Match or Exceed
Moisture Sensitivity Level	MSL 1 (Unlimited)	Important - Must Match or Better
Number of Terminations	2	Critical - Must Match Exactly

Substitute Part Grouping Explanation

Substitution logic for the RC1608F2102CS is based on strict electrical and mechanical parameter matching. All substitute parts must satisfy the following criteria:

Mandatory Matching Parameters:

Resistance: 21 kOhms (exact match)
Tolerance: ±1% (exact match)
Power Rating: 0.1W / 1/10W (exact match or higher)
Package: 0603 (1608 Metric) (exact match)
Temperature Coefficient: ±100ppm/°C (exact match)
Operating Temperature: -55°C to 155°C (exact match or wider range)
Composition: Thick Film (exact match)
Terminations: 2 (exact match)

Compliance Parameters:

RoHS Status: ROHS3 Compliant or equivalent
Moisture Sensitivity: MSL 1 or better
REACH Status: REACH Unaffected or REACH Compliant

Substitute parts are grouped into two categories:

Direct Substitutes: Parts meeting all mandatory parameters with identical compliance status (ROHS3 Compliant, REACH Unaffected).

Similar Substitutes: Parts meeting all mandatory parameters but with additional certifications (AEC-Q200 automotive qualification) or minor compliance variations. These parts are electrically and mechanically equivalent but may have enhanced qualification levels or different regulatory status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	RoHS Status	MSL	AEC-Q200
RC1608F2102CS	Samsung Electro-Mechanics	21 kOhms	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	ROHS3	1	No
CR0603-FX-2102ELF	Bourns Inc.	21 kOhms	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	ROHS3	1	No
RC0603FR-0721KL	YAGEO	21 kOhms	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	ROHS3	1	No
AC0603FR-0721KL	YAGEO	21 kOhms	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	ROHS3	1	Yes
CRCW060321K0FKEA	Vishay Dale	21 kOhms	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	ROHS3	1	Yes
CRCW060321K0FKTA	Vishay Dale	21 kOhms	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	RoHS Non-Compliant	1	Yes
ERJ-3EKF2102V	Panasonic Electronic Components	21 kOhms	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	ROHS3	1	Yes
RMCF0603FT21K0	Stackpole Electronics Inc	21 kOhms	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	ROHS3	1	Yes

Engineering Selection Recommendations

Direct Substitutes (Preferred for Non-Automotive Applications):

CR0603-FX-2102ELF (Bourns Inc.) and RC0603FR-0721KL (YAGEO) are direct electrical and mechanical equivalents to the RC1608F2102CS. Both parts maintain identical electrical specifications, ROHS3 compliance, and MSL 1 rating without additional automotive qualification. These parts are suitable for general industrial and consumer applications where AEC-Q200 certification is not required.

Qualified Substitutes (For Automotive and High-Reliability Applications):

AC0603FR-0721KL (YAGEO), CRCW060321K0FKEA (Vishay Dale), ERJ-3EKF2102V (Panasonic Electronic Components), and RMCF0603FT21K0 (Stackpole Electronics Inc) are electrically and mechanically equivalent to the RC1608F2102CS with the addition of AEC-Q200 automotive qualification. These parts meet all mandatory electrical parameters and maintain ROHS3 compliance with MSL 1 rating. AEC-Q200 certification indicates qualification for automotive applications with enhanced reliability testing and traceability requirements.

Non-Compliant Substitute (Not Recommended for New Designs):

CRCW060321K0FKTA (Vishay Dale) meets all electrical and mechanical specifications but carries RoHS non-compliant status and REACH Affected designation. This part is electrically equivalent but does not satisfy current environmental compliance requirements and is not suitable for new product designs or applications requiring ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can I substitute RC1608F2102CS with CR0603-FX-2102ELF in my design?

A: Yes. CR0603-FX-2102ELF is a direct substitute meeting all electrical parameters (21 kOhms ±1%, 0.1W, ±100ppm/°C), package specification (0603), and compliance requirements (ROHS3, MSL 1). No design changes are required.

Q: What is the difference between the YAGEO RC0603FR-0721KL and AC0603FR-0721KL?

A: Both parts are electrically and mechanically identical with 21 kOhms ±1% resistance, 0.1W power rating, and 0603 package. The AC0603FR-0721KL includes AEC-Q200 automotive qualification, making it suitable for automotive applications. The RC0603FR-0721KL is suitable for general industrial applications. Both maintain ROHS3 compliance and MSL 1 rating.

Q: Are all substitute parts available in the same packaging format?

A: All listed substitute parts are available in Tape & Reel (TR) or Cut Tape (CT) & Digi-Reel packaging. The ERJ-3EKF2102V (Panasonic) is supplied in Cut Tape and Digi-Reel format, while other substitutes are supplied in Tape & Reel format. Verify packaging requirements with your procurement specification before selection.

Q: Can I use CRCW060321K0FKTA as a substitute for new product designs?

A: No. CRCW060321K0FKTA carries RoHS non-compliant status and REACH Affected designation, which does not meet current environmental compliance standards. This part is not suitable for new product designs. Use CRCW060321K0FKEA (ROHS3 compliant version) instead.

Q: What does AEC-Q200 certification mean for resistor selection?

A: AEC-Q200 is an automotive industry qualification standard indicating the component has undergone enhanced reliability testing, including thermal cycling, moisture resistance, and mechanical stress testing. Parts with AEC-Q200 certification are suitable for automotive applications and high-reliability environments. Non-automotive applications do not require AEC-Q200 certification.

Q: Are there any physical dimension differences between substitute parts?

A: All substitute parts conform to the 0603 (1608 Metric) package standard. Minor dimensional variations exist within tolerance: length ranges from 0.061" to 0.063" (1.55mm to 1.60mm), width ranges from 0.031" to 0.033" (0.80mm to 0.85mm), and height ranges from 0.020" to 0.022" (0.50mm to 0.55mm). These variations are within standard PCB assembly tolerances and do not affect interchangeability.

Q: Which substitute part has the highest inventory availability?

A: ERJ-3EKF2102V (Panasonic Electronic Components) has the highest inventory with 92,845 pieces in stock, followed by CRCW060321K0FKEA (Vishay Dale) with 35,705 pieces. CR0603-FX-2102ELF (Bourns Inc.) has 31,329 pieces available.

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