RC1608F681CS Equivalent & Substitute Parts Reference

Part Overview

The RC1608F681CS is a 680 Ohm ±1% thick film chip resistor manufactured by Samsung Electro-Mechanics in 0603 (1608 Metric) package format with 0.1W power rating. This component is classified as Active product status with moisture resistant characteristics and unlimited moisture sensitivity level (MSL 1). The part is ROHS3 compliant and suitable for general industrial applications operating across -55°C to 155°C temperature range.

Equivalent and substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative packaging formats are required, or when application-specific certifications such as automotive AEC-Q200 qualification are mandated for design requirements.

Substiute Parts

RC1608F681CS

Samsung Electro-MechanicsIn Stock: 1158RC1608F681CS Datasheet

Current PartRFQ

CR0603-FX-6800ELF

Bourns Inc.In Stock: 109618CR0603-FX-6800ELF Datasheet

DirectRFQ

RC0603FR-07680RL

YAGEOIn Stock: 500494RC0603FR-07680RL Datasheet

DirectRFQ

KTR03EZPF6800

Rohm SemiconductorIn Stock: 5648KTR03EZPF6800 Datasheet

UpgradeRFQ

MCR03ERTF6800

Rohm SemiconductorIn Stock: 1058MCR03ERTF6800 Datasheet

UpgradeRFQ

AC0603FR-07680RL

YAGEOIn Stock: 24915AC0603FR-07680RL Datasheet

SimilarRFQ

CRCW0603680RFKEA

Vishay DaleIn Stock: 1000303CRCW0603680RFKEA Datasheet

SimilarRFQ

CRCW0603680RFKEB

Vishay DaleIn Stock: 28296CRCW0603680RFKEB Datasheet

SimilarRFQ

CRCW0603680RFKTA

Vishay DaleIn Stock: 5835CRCW0603680RFKTA Datasheet

SimilarRFQ

ERJ-3EKF6800V

Panasonic Electronic ComponentsIn Stock: 194408ERJ-3EKF6800V Datasheet

SimilarRFQ

RMCF0603FG680R

Stackpole Electronics IncIn Stock: 1059RMCF0603FG680R Datasheet

SimilarRFQ

RMCF0603FT680R

Stackpole Electronics IncIn Stock: 33729RMCF0603FT680R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RC1608F681CS is determined by strict equivalence across the following mandatory parameters:

Electrical Parameters (Non-negotiable):

• Resistance: 680 Ohms
• Tolerance: ±1%
• Power Rating: 0.1W (1/10W)
• Temperature Coefficient: ±100ppm/°C
• Operating Temperature Range: -55°C ~ 155°C

Physical Parameters (Non-negotiable):

• Package / Case: 0603 (1608 Metric)
• Number of Terminations: 2
• Composition: Thick Film

Compliance Parameters (Application-dependent):

• RoHS Status: ROHS3 Compliant (preferred)
• Moisture Sensitivity Level: 1 (Unlimited)
• REACH Status: REACH Unaffected (preferred)

Substitute parts are categorized into three groups based on functional equivalence and feature enhancement:

Direct Substitutes: Parts meeting all mandatory electrical, physical, and compliance parameters with identical or compatible packaging formats.

Upgrade Substitutes: Parts meeting all mandatory parameters with additional certifications (AEC-Q200 automotive qualification) or enhanced features (high voltage capability) suitable for applications requiring higher reliability standards.

Similar Substitutes: Parts meeting all mandatory electrical and physical parameters with alternative packaging formats or modified compliance status, applicable when specific packaging or certification requirements differ from the primary part.

Parameter Comparison

Engineering Selection Recommendations

For General Industrial Applications (Non-Automotive):

CR0603-FX-6800ELF (Bourns Inc.) and RC0603FR-07680RL (YAGEO) are direct functional equivalents to RC1608F681CS. Both parts maintain identical electrical specifications, 0603 package format, and ROHS3 compliance. Selection between these options depends on packaging format preference: CR0603-FX-6800ELF is supplied in Cut Tape & Digi-Reel format, while RC0603FR-07680RL offers the same format with higher inventory availability (500,400 units).

For Automotive Applications (AEC-Q200 Required):

KTR03EZPF6800 (Rohm Semiconductor), AC0603FR-07680RL (YAGEO), CRCW0603680RFKEA (Vishay Dale), ERJ-3EKF6800V (Panasonic), and RMCF0603FG680R (Stackpole Electronics) all meet automotive AEC-Q200 qualification requirements while maintaining full electrical and physical equivalence to the primary part. These parts are suitable for applications requiring automotive-grade reliability standards.

Compliance Considerations:

CRCW0603680RFKTA (Vishay Dale) is Active product status but carries RoHS non-compliant designation and REACH Affected status. This part is not recommended for new designs targeting ROHS3 compliance or REACH-regulated markets.

MCR03ERTF6800 (Rohm Semiconductor) is discontinued at DiGi Electronics. While inventory remains available (1,022 units), this part should not be selected for new production designs.

CRCW0603680RFKEB (Vishay Dale) is discontinued at DiGi Electronics despite ROHS3 compliance. Remaining inventory (28,187 units) may support legacy production requirements only.

Recommended Primary Selections:

1. RC0603FR-07680RL (YAGEO) for general industrial applications with maximum inventory availability
2. ERJ-3EKF6800V (Panasonic) for automotive applications with AEC-Q200 certification and high inventory (194,326 units)
3. CRCW0603680RFKEA (Vishay Dale) for automotive applications with largest inventory pool (1,000,200 units)

Frequently Asked Questions (FAQ)

Q: Can RC1608F681CS be directly replaced with CR0603-FX-6800ELF?

A: Yes. CR0603-FX-6800ELF is a direct functional equivalent. Both parts share identical resistance (680 Ohms), tolerance (±1%), power rating (0.1W), package format (0603), composition (thick film), temperature coefficient (±100ppm/°C), operating range (-55°C to 155°C), and ROHS3 compliance. The only difference is packaging format: CR0603-FX-6800ELF uses Cut Tape & Digi-Reel while RC1608F681CS uses Tape & Reel. This difference does not affect electrical performance or board-level compatibility.

Q: What is the difference between "Direct Substitutes" and "Upgrade Substitutes"?

A: Direct substitutes (CR0603-FX-6800ELF, RC0603FR-07680RL) meet all mandatory electrical and physical specifications without additional certifications. Upgrade substitutes (KTR03EZPF6800, AC0603FR-07680RL, CRCW0603680RFKEA, ERJ-3EKF6800V, RMCF0603FG680R) include automotive AEC-Q200 qualification or high voltage capability. Upgrade substitutes are suitable for applications requiring higher reliability standards but are not necessary for general industrial use.

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

A: Yes. AEC-Q200 qualified parts exceed general industrial specifications and are fully compatible with non-automotive applications. Using automotive-grade components in non-automotive designs introduces no compatibility issues and may provide enhanced reliability margins.

Q: Why is CRCW0603680RFKTA not recommended despite Active product status?

A: CRCW0603680RFKTA carries RoHS non-compliant designation and REACH Affected status. These regulatory designations indicate the part does not meet current environmental compliance requirements for most markets. New designs should not incorporate this part unless legacy production support is specifically required.

Q: What is the significance of MSL 1 (Unlimited) moisture sensitivity level?

A: MSL 1 indicates unlimited shelf life without moisture absorption concerns. This classification means the part requires no special moisture control during storage, handling, or assembly. All substitute parts listed maintain MSL 1 rating, ensuring equivalent moisture handling requirements.

Q: Can I substitute RC1608F681CS with a part having different physical dimensions?

A: No. All substitute parts maintain identical 0603 (1608 Metric) package dimensions: 0.063" L x 0.031" W (1.60mm x 0.80mm) with maximum seated height of 0.022" (0.55mm). Minor dimensional variations exist among manufacturers (for example, CRCW series shows 0.061" L x 0.033" W), but these fall within standard 0603 package tolerance ranges and do not affect PCB footprint compatibility or assembly processes.

Q: Which substitute part offers the highest inventory availability?

A: CRCW0603680RFKEA (Vishay Dale) provides the largest inventory pool with 1,000,200 units in stock. RC0603FR-07680RL (YAGEO) offers 500,400 units. Both parts are Active status with ROHS3 compliance and suitable for immediate production deployment.

Q: Is temperature coefficient specification identical across all substitute parts?

A: Yes. All listed substitute parts maintain ±100ppm/°C temperature coefficient, identical to RC1608F681CS. This specification ensures equivalent frequency stability and thermal performance across the -55°C to 155°C operating range.

Q: What packaging format should I select for high-volume production?

A: For high-volume production, Tape & Reel (TR) format is standard. RC1608F681CS, KTR03EZPF6800, AC0603FR-07680RL, CRCW0603680RFKEB, CRCW0603680RFKTA, ERJ-3EKF6800V, and RMCF0603FG680R all use Tape & Reel format. Cut Tape & Digi-Reel format (CR0603-FX-6800ELF, RC0603FR-07680RL, MCR03ERTF6800, CRCW0603680RFKEA) is suitable for lower-volume or prototype applications.