EPSON FC-12D 32.7680KA-AC3 Equivalent & Substitute Parts

Part Overview

The EPSON FC-12D 32.7680KA-AC3 is a 32.768 kHz tuning fork crystal designed for real-time clock (RTC) and timing applications. This component operates at a fundamental frequency of 32.768 kHz with a load capacitance of 9pF and an equivalent series resistance (ESR) of 75 kOhms. The part is packaged in a 4-SMD, No Lead surface mount configuration with dimensions of 2.05mm x 1.25mm.

The FC-12D 32.7680KA-AC3 is classified as obsolete. Locating equivalent or substitute parts is necessary to support ongoing production, maintenance, and design updates where this component is specified.

Substiute Parts

FC-12D 32.7680KA-AC3

EPSONIn Stock: 1156FC-12D 32.7680KA-AC3 Datasheet

Current PartRFQ

FC1610AN 32.7680KA-AC0

EPSONIn Stock: 902FC1610AN 32.7680KA-AC0 Datasheet

SimilarRFQ

FC2012AN 32.768K-90NN60KC7

EPSONIn Stock: 38356FC2012AN 32.768K-90NN60KC7 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FC-12D 32.7680KA-AC3 is determined by the following critical parameters:

• Frequency and Tolerance: All substitute parts must operate at 32.768 kHz with ±20ppm tolerance to maintain timing accuracy in RTC applications.
• Load Capacitance: All parts must have 9pF load capacitance for circuit compatibility.
• Operating Mode: All parts must operate in fundamental mode.
• ESR Range: The ESR of substitute parts may vary (60 kOhms to 90 kOhms) while maintaining functional compatibility with standard RTC oscillator circuits.
• Operating Temperature: Substitute parts must support the minimum temperature range of -40°C ~ 85°C; extended ranges are acceptable.
• Mounting and Package: Surface mount configuration is required; package footprint variations (2-SMD vs. 4-SMD) require PCB layout verification.
• Compliance: All parts must maintain ROHS3 compliance and MSL 1 rating.

Parameter Comparison

Engineering Selection Recommendations

FC1610AN 32.7680KA-AC0: This part is classified as active and maintains full compliance with ROHS3 and MSL 1 requirements. The ESR of 90 kOhms is within acceptable tolerance for standard RTC oscillator circuits. The primary consideration is the package footprint change from 4-SMD to 2-SMD and the reduced physical dimensions (1.65mm x 1.05mm). PCB layout modification is required to accommodate this smaller footprint.

FC2012AN 32.768K-90NN60KC7: This part is classified as active with ROHS3 and MSL 1 compliance. The ESR of 60 kOhms provides improved performance characteristics compared to the main part. The operating temperature range extends to 105°C, offering broader environmental capability. The package footprint is 2-SMD with dimensions of 2.05mm x 1.20mm, which is closer to the original part's length but requires PCB layout verification due to the package type change and increased height (0.60mm vs. 0.35mm).

Both substitute parts are currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete main part.

Frequently Asked Questions (FAQ)

Q: Can the FC1610AN 32.7680KA-AC0 be used as a direct replacement for the FC-12D 32.7680KA-AC3?

A: The FC1610AN maintains electrical compatibility through matching frequency, tolerance, load capacitance, and operating mode. However, the package footprint differs (2-SMD vs. 4-SMD), and physical dimensions are smaller. PCB layout modification is required.

Q: What is the impact of ESR variation between the main part (75 kOhms) and substitute parts (60-90 kOhms)?

A: ESR variation within this range is acceptable for standard RTC oscillator circuits. The ESR affects oscillation startup time and power consumption but does not compromise frequency accuracy or tolerance specifications. Circuit simulation or testing may be warranted for applications with specific power budget constraints.

Q: Is the FC2012AN 32.768K-90NN60KC7 suitable for applications requiring extended temperature operation?

A: Yes. The FC2012AN supports an operating temperature range of -40°C ~ 105°C, which exceeds the original part's -40°C ~ 85°C range. This part is suitable for applications requiring operation at elevated temperatures.

Q: What are the packaging implications of switching from 4-SMD to 2-SMD configuration?

A: The 2-SMD package uses a different footprint and pin configuration. PCB layout, solder pad design, and assembly process parameters must be updated accordingly. Physical dimensions and height also differ, requiring verification of clearance and mechanical constraints.

Q: Are both substitute parts available in the same packaging format as the main part?

A: No. Both substitute parts are supplied in Tape & Reel (TR) packaging, while the main part's original packaging format is not specified in the provided data. Confirm packaging requirements with your procurement process.

Q: Do the substitute parts maintain the same compliance certifications as the main part?

A: Yes. Both substitute parts are ROHS3 compliant with MSL 1 (Unlimited) rating, matching the main part's compliance profile.