FC-13F 32.7680KA-AC Equivalent & Substitute Parts

Part Overview

The FC-13F 32.7680KA-AC is a 32.768 kHz tuning fork crystal manufactured by EPSON, designed for real-time clock (RTC) and timing applications requiring precise frequency stability. This component operates at ±20ppm frequency tolerance with a 9pF load capacitance and 80 kOhms equivalent series resistance (ESR). The part is classified as obsolete, necessitating identification of active substitute components that maintain electrical and mechanical compatibility for continued system support and new design implementations.

Substiute Parts

FC-13F 32.7680KA-AC

EPSONIn Stock: 1040FC-13F 32.7680KA-AC Datasheet

Current PartRFQ

FC-12M 32.7680KA-AC

EPSONIn Stock: 808FC-12M 32.7680KA-AC Datasheet

SimilarRFQ

FC-12M 32.7680KA-AG

EPSONIn Stock: 1161FC-12M 32.7680KA-AG Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FC-13F 32.7680KA-AC is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Frequency: 32.768 kHz (exact match required)
• Frequency Tolerance: ±20ppm (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, No Lead (exact match required)
• Height - Seated (Max): 0.024" (0.60mm) (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)
• Moisture Sensitivity Level (MSL): 1 (Unlimited) (exact match required)

Secondary Substitution Parameters (Allowable Variation):

• Load Capacitance: 9pF or 7pF (circuit design dependent)
• ESR (Equivalent Series Resistance): 80 kOhms or 90 kOhms (within acceptable oscillator circuit tolerance)
• Physical Dimensions (Length/Width): Variation permitted within SMD footprint compatibility

The FC-12M series from EPSON meets all primary substitution criteria. Two variants are available: FC-12M 32.7680KA-AC (9pF load capacitance, 90 kOhms ESR) and FC-12M 32.7680KA-AG (7pF load capacitance, 90 kOhms ESR). Both are active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

FC-12M 32.7680KA-AC Selection: This substitute is recommended for applications where the original 9pF load capacitance specification is required. The FC-12M 32.7680KA-AC maintains identical electrical parameters to the FC-13F 32.7680KA-AC with the exception of ESR (90 kOhms versus 80 kOhms), which remains within acceptable oscillator circuit tolerance margins. The part is currently in active production status with ROHS3 compliance and MSL 1 rating. Physical dimensions are reduced (2.05mm x 1.20mm versus 3.20mm x 1.50mm), enabling improved PCB layout density while maintaining identical mounting height and package type.

FC-12M 32.7680KA-AG Selection: This substitute is applicable for designs where 7pF load capacitance is acceptable or preferred. Circuit design verification is required to confirm compatibility with the reduced load capacitance specification. The part is currently in active production status with ROHS3 compliance and MSL 1 rating. Selection of this variant provides identical frequency, tolerance, temperature range, and compliance certifications as the main part.

Both FC-12M variants are manufactured by EPSON and maintain full regulatory compliance with ROHS3 and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can FC-12M 32.7680KA-AC directly replace FC-13F 32.7680KA-AC without circuit modification?

A: The FC-12M 32.7680KA-AC is electrically compatible with the FC-13F 32.7680KA-AC for applications designed to operate with 9pF load capacitance. The 10 kOhms ESR difference (90 kOhms versus 80 kOhms) is within typical oscillator circuit tolerance. Physical dimensions are smaller, but mounting height and package type are identical. PCB layout adjustment may be required due to reduced footprint dimensions.

Q: What is the difference between FC-12M 32.7680KA-AC and FC-12M 32.7680KA-AG?

A: The primary difference is load capacitance: FC-12M 32.7680KA-AC specifies 9pF, while FC-12M 32.7680KA-AG specifies 7pF. Both maintain identical frequency (32.768 kHz), frequency tolerance (±20ppm), ESR (90 kOhms), operating temperature range (-40°C ~ 85°C), and package specifications. Selection depends on circuit design requirements for load capacitance.

Q: Are the FC-12M substitutes physically compatible with the FC-13F footprint?

A: Both FC-12M variants use the same 2-SMD, No Lead package type and identical mounting height (0.024" / 0.60mm) as the FC-13F. However, the FC-12M footprint is smaller (2.05mm x 1.20mm versus 3.20mm x 1.50mm). PCB layout modification is required to accommodate the reduced dimensions. Existing FC-13F pads cannot be directly reused without redesign.

Q: Do the FC-12M substitutes maintain the same regulatory compliance as the FC-13F?

A: Yes. Both FC-12M 32.7680KA-AC and FC-12M 32.7680KA-AG are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the FC-13F 32.7680KA-AC specifications. Both are classified as EAR99 for export purposes.

Q: What is the current availability status of these substitute parts?

A: FC-12M 32.7680KA-AC is in active production (754 Pcs inventory). FC-12M 32.7680KA-AG is in active production (1075 Pcs inventory). The original FC-13F 32.7680KA-AC is obsolete with limited remaining stock (1003 Pcs).