FC-12D 32.7680KA-AC Equivalent & Substitute Parts

Part Overview

The FC-12D 32.7680KA-AC is a 32.768 kHz tuning fork crystal manufactured by EPSON, designed for real-time clock 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 currently classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for ongoing production and maintenance requirements.

Substiute Parts

FC-12D 32.7680KA-AC

EPSONIn Stock: 919FC-12D 32.7680KA-AC 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 for the FC-12D 32.7680KA-AC is determined by the following critical electrical parameters: frequency (32.768 kHz), frequency tolerance (±20ppm), and load capacitance (9pF). These parameters define the functional equivalence of tuning fork crystals in real-time clock applications.

The identified substitute parts maintain identical frequency, frequency tolerance, and load capacitance specifications. Variations in ESR (75 kOhms vs. 90 kOhms vs. 60 kOhms) and package configuration (4-SMD vs. 2-SMD) represent acceptable substitution criteria when circuit design accommodates the specified ESR range. Operating temperature range differences and package size variations must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both FC1610AN 32.7680KA-AC0 and FC2012AN 32.768K-90NN60KC7 are active products suitable for substitution of the obsolete FC-12D 32.7680KA-AC. Selection between these alternatives depends on specific application constraints:

The FC1610AN 32.7680KA-AC0 maintains the same operating temperature range (-40°C ~ 85°C) as the original part and offers a smaller footprint (1.65mm x 1.05mm). The ESR specification of 90 kOhms is within acceptable tolerance for most real-time clock applications.

The FC2012AN 32.768K-90NN60KC7 provides an extended operating temperature range (-40°C ~ 105°C) and the lowest ESR specification (60 kOhms) among available substitutes. The package dimensions (2.05mm x 1.20mm) closely match the original part length, facilitating PCB layout compatibility. This part is available in significantly higher inventory quantities.

Both substitute parts are ROHS3 compliant and maintain the critical electrical parameters (frequency, tolerance, and load capacitance) required for functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can FC1610AN 32.7680KA-AC0 or FC2012AN 32.768K-90NN60KC7 directly replace FC-12D 32.7680KA-AC?

A: Both parts are electrically equivalent based on frequency (32.768 kHz), frequency tolerance (±20ppm), and load capacitance (9pF) specifications. Physical substitution requires PCB layout evaluation due to package configuration differences (4-SMD vs. 2-SMD) and dimensional variations.

Q: What is the significance of ESR differences (75 kOhms vs. 90 kOhms vs. 60 kOhms)?

A: ESR affects crystal oscillator circuit performance, including startup time and power consumption. The specified ESR values for all three parts are within acceptable ranges for standard real-time clock applications. Circuit design must accommodate the ESR specification of the selected substitute.

Q: Does the operating temperature range difference affect substitution suitability?

A: The FC-12D operates from -40°C to 85°C, while FC1610AN maintains this range and FC2012AN extends to 105°C. Selection depends on application temperature requirements. The extended range of FC2012AN provides additional operational margin for demanding environments.

Q: Are package size differences critical for substitution?

A: Package dimensions vary between the 4-SMD original part and the 2-SMD substitutes. PCB footprint compatibility must be verified. The FC2012AN dimensions (2.05mm x 1.20mm length) are closer to the original part than FC1610AN (1.65mm x 1.05mm), potentially simplifying layout modifications.

Q: What compliance certifications apply to these substitute parts?

A: All three parts are ROHS3 compliant. FC1610AN includes REACH Unaffected status. Both substitute parts carry EAR99 ECCN classification and HTSUS code 8541.60.0010, matching the original part's regulatory profile.