RC1608F684CS Equivalent & Substitute Parts Reference

Part Overview

The RC1608F684CS is a 680 kOhms ±1% 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 ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). The part is specified for general-purpose applications requiring precision resistive elements with moisture resistance in compact surface-mount form factors. Equivalent and substitute parts are identified based on matching electrical specifications, mechanical dimensions, and compliance certifications to enable component sourcing flexibility and supply chain continuity.

Key Parameters

Parameter	Specification
Resistance Value	680 kOhms
Tolerance	±1%
Power Rating	0.1W (1/10W)
Package / Case	0603 (1608 Metric)
Composition	Thick Film
Temperature Coefficient	±100ppm/°C
Operating Temperature Range	-55°C to 155°C
Physical Dimensions	0.063" L x 0.031" W (1.60mm x 0.80mm)
Height (Seated Max)	0.022" (0.55mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)
Number of Terminations	2

Substitute Part Grouping Explanation

Substitute parts for the RC1608F684CS are classified into three categories based on functional equivalence and application suitability:

Direct Equivalents share identical electrical specifications (680 kOhms ±1%, 0.1W), mechanical package (0603), composition (thick film), temperature coefficient (±100ppm/°C), and operating range (-55°C to 155°C). These parts are interchangeable in standard applications without design modification. Direct equivalents include CR0603-FX-6803ELF (Bourns Inc.), CRG0603F680K (TE Connectivity), and RC0603FR-07680KL (YAGEO).

Upgrade Substitutes maintain all electrical and mechanical parameters while adding enhanced features such as Automotive AEC-Q200 qualification and high-voltage capability. The KTR03EZPF6803 (Rohm Semiconductor) is classified as an upgrade substitute, suitable for applications requiring automotive-grade reliability without design changes.

Similar Alternatives match core electrical specifications and package dimensions while incorporating automotive AEC-Q200 certification or minor dimensional variations within tolerance. These include AC0603FR-07680KL (YAGEO), CRCW0603680KFKEA (Vishay Dale), ERJ-3EKF6803V (Panasonic), and RMCF0603FT680K (Stackpole Electronics).

Substitution eligibility is determined by: (1) Resistance value and tolerance match, (2) Power rating equivalence, (3) Package/case compatibility, (4) Temperature coefficient alignment, (5) Operating temperature range coverage, and (6) RoHS/REACH compliance status.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Resistance	Tolerance	Power (W)	Package	Temp Coeff	Op Temp Range	Dimensions (mm)	Height Max (mm)	Features	RoHS	MSL	Packaging Type
RC1608F684CS	Samsung Electro-Mechanics	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.60 x 0.80	0.55	Moisture Resistant	ROHS3	1	Cut Tape (CT)
CR0603-FX-6803ELF	Bourns Inc.	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.60 x 0.80	0.55	Moisture Resistant	ROHS3	1	Tape & Reel (TR)
CRG0603F680K	TE Connectivity Passive Product	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.60 x 0.80	0.55	—	ROHS3	1	Tape & Reel (TR)
RC0603FR-07680KL	YAGEO	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.60 x 0.80	0.55	Moisture Resistant	ROHS3	1	Cut Tape (CT) & Digi-Reel®
KTR03EZPF6803	Rohm Semiconductor	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.60 x 0.80	0.55	Automotive AEC-Q200, High Voltage	ROHS3	1	Tape & Reel (TR)
AC0603FR-07680KL	YAGEO	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.60 x 0.80	0.55	Automotive AEC-Q200, Moisture Resistant	ROHS3	1	Cut Tape (CT) & Digi-Reel®
CRCW0603680KFKEA	Vishay Dale	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.55 x 0.85	0.50	Automotive AEC-Q200	ROHS3	1	Tape & Reel (TR)
ERJ-3EKF6803V	Panasonic Electronic Components	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.60 x 0.80	0.55	Automotive AEC-Q200	ROHS3	1	Tape & Reel (TR)
RMCF0603FT680K	Stackpole Electronics Inc	680 kΩ	±1%	0.1	0603	±100ppm/°C	-55 to 155°C	1.55 x 0.80	0.55	Automotive AEC-Q200	ROHS3	1	Tape & Reel (TR)

Engineering Selection Recommendations

For Standard Applications: CR0603-FX-6803ELF (Bourns Inc.), CRG0603F680K (TE Connectivity), and RC0603FR-07680KL (YAGEO) are direct functional equivalents. All three maintain identical electrical specifications, package dimensions, and ROHS3 compliance. Selection among these direct equivalents is based on packaging preference (Cut Tape vs. Tape & Reel) and inventory availability.

For Automotive Applications: KTR03EZPF6803 (Rohm Semiconductor), AC0603FR-07680KL (YAGEO), ERJ-3EKF6803V (Panasonic), CRCW0603680KFKEA (Vishay Dale), and RMCF0603FT680K (Stackpole Electronics) incorporate Automotive AEC-Q200 qualification. These parts are suitable for automotive-grade designs without modification to electrical or mechanical specifications. KTR03EZPF6803 additionally specifies high-voltage capability.

Dimensional Considerations: CRCW0603680KFKEA (Vishay Dale) and RMCF0603FT680K (Stackpole Electronics) exhibit minor dimensional variations (length 1.55mm vs. 1.60mm standard; height 0.50mm vs. 0.55mm standard). These variations remain within 0603 package tolerance but should be verified against PCB layout constraints in space-critical applications.

Compliance Status: All listed substitute parts maintain ROHS3 compliance, REACH unaffected status, and MSL 1 (unlimited) moisture sensitivity level, matching the original RC1608F684CS specification.

Frequently Asked Questions (FAQ)

Q: Can I substitute RC1608F684CS with CR0603-FX-6803ELF in my design?

A: Yes. CR0603-FX-6803ELF is a direct equivalent with identical resistance (680 kΩ ±1%), power rating (0.1W), package (0603), temperature coefficient (±100ppm/°C), and operating range (-55°C to 155°C). The only difference is packaging format (Tape & Reel vs. Cut Tape). No design changes are required.

Q: What is the difference between standard and automotive-qualified substitutes?

A: Automotive-qualified parts (KTR03EZPF6803, AC0603FR-07680KL, ERJ-3EKF6803V, CRCW0603680KFKEA, RMCF0603FT680K) carry AEC-Q200 certification, indicating compliance with automotive reliability and qualification standards. Standard parts (CR0603-FX-6803ELF, CRG0603F680K, RC0603FR-07680KL) do not carry this certification. Use automotive-qualified parts only when AEC-Q200 compliance is a design requirement.

Q: Are there dimensional differences between substitute parts?

A: Most substitutes maintain standard 0603 dimensions (1.60mm L x 0.80mm W, 0.55mm height max). CRCW0603680KFKEA and RMCF0603FT680K show minor variations: CRCW0603680KFKEA is 1.55mm x 0.85mm with 0.50mm height; RMCF0603FT680K is 1.55mm x 0.80mm. Verify these dimensions against your PCB layout before substitution.

Q: Can I use KTR03EZPF6803 as a direct replacement for RC1608F684CS?

A: Yes. KTR03EZPF6803 matches all electrical and mechanical specifications of RC1608F684CS and adds automotive AEC-Q200 qualification and high-voltage capability. It is a functional upgrade with no design modifications required.

Q: What packaging options are available for substitutes?

A: Substitute parts are supplied in two packaging formats: Cut Tape (CT) or Digi-Reel® for manual assembly and small-volume applications, and Tape & Reel (TR) for automated pick-and-place assembly. RC1608F684CS is supplied in Cut Tape format. Select packaging based on assembly process requirements.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original RC1608F684CS specification.

Q: Which substitute has the highest inventory availability?

A: RC0603FR-07680KL (YAGEO) has the highest inventory at 269,891 pieces. RMCF0603FT680K (Stackpole Electronics) has 315,100 pieces available. Both are suitable for high-volume production requirements.

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