kHz Tuning Fork Crystals — Find Your Series

A specialized selection of low-frequency quartz crystal resonators tailored for real-time clock (RTC) and ultra-low-power timing applications. Browse our kHz series, match your packaging and electrical requirements, and request free engineering samples within 72 hours. 1 piece is acceptable for prototype evaluation.

Not sure where to start?

Three ways to narrow down our series to the ones that match your design.

By Mounting & Size

From ultra-miniature SMD configurations (down to 1.2 × 1.0 mm) optimized for high-density modern layouts, to classic cylinder through-hole designs (such as 2×6 mm or 3×8 mm) for legacy system maintenance.

SMD kHz Table

Through-Hole Table

By Performance Need

Select by critical electrical parameters including low equivalent series resistance (ESR) to ensure rapid oscillation startup in low-drive circuits, and low load capacitance (CL) options down to 3 pF to maximize battery operational lifespan.

Low ESR Series

Low CL (3 pF)

AEC-Q200 Automotive

By Application

Align your design with specialized industry standards. Access low-power configurations for consumer IoT and smart wearables, or select AEC-Q200 automotive-grade options for tire pressure monitoring systems (TPMS) and body control units.

Consumer / IoT

Smart Metering / Utility

Automotive Grade

Series Parametric Table

Series	Package	Frequency Range	Tolerance	Temp. Range	CL	ESR	Mount	Contact
FCT-1S	1210 2-SMD	32.768 kHz	±5 ppm	-40 to +95℃	6 - 12.5 pF	70 - 90 KΩ	SMD	Inquiry
FCT-1D	1210 4-SMD	32.768 kHz	±20 ppm	-40 to +95℃	6 - 12.5 pF	70 - 90 KΩ	SMD	Inquiry
FCT-1M	1610 2-SMD	32.768 kHz	±5 ppm	-40 to +125℃	6 - 12.5 pF	70 - 90 KΩ	SMD	Inquiry
FCT-2M	2012 2-SMD	32.768 kHz	±5 ppm	-40 to +125℃	6 - 12.5 pF	70 - 90 KΩ	SMD	Inquiry
FSX-215	2012 2-SMD	32.768 kHz	±5 ppm	-40 to +125℃	6 - 12.5 pF	70 - 90 KΩ	SMD	Inquiry
FCT-3M	3215 2-SMD	32.768 kHz	±5 ppm	-40 to +125℃	6 - 12.5 pF	70 - 90 KΩ	SMD	Inquiry
FSX-3215	3215 2-SMD	32.768 kHz	±5 ppm	-40 to +125℃	6 - 12.5 pF	70 - 90 KΩ	SMD	Inquiry
FCT-6M	4-SMD, Flat Leads	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	65 KΩ	SMD	Inquiry
FSX-145	4-SMD, Flat Leads	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	65 KΩ	SMD	Inquiry
FCT-8M	4-SOJ, 5.50mm pitch	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	50 KΩ	SMD	Inquiry
FTS-26M	4-SOJ, 5.50mm pitch	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	50 KΩ	SMD	Inquiry
FTS-26B	2 x 6 Cylindrical Can, SMD	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	40 KΩ	SMD	Inquiry

Picture	Series	Package	Frequency Range	Tolerance	Temp. Range	CL	ESR	Mount	Contact
	FCT-2M-LC	2012 2-SMD	32.768 kHz	±20 ppm	-40 to +125℃	3 pF	80 KΩ	SMD	Inquiry
	FCT-3M-LC	3215 2-SMD	32.768 kHz	±20 ppm	-40 to +125℃	3 pF	70 KΩ	SMD	Inquiry

Series	Package	Frequency Range	Tolerance	Temp. Range	CL	ESR	Mount	Contact
FCT-2T	2 x 6 Cylindrical Can	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	40 KΩ	DIP	Inquiry
FTS-26	2 x 6 Cylindrical Can	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	40 KΩ	DIP	Inquiry
FCT-3T	3 x 8 Cylindrical Can	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	30 KΩ	DIP	Inquiry
FTS-38	3 x 8 Cylindrical Can	32.768 kHz	±5 ppm	-40 to +90℃	6 - 12.5 pF	30 KΩ	DIP	Inquiry

Picture	Series	Package	Frequency Range	Tolerance	Temp. Range	CL	ESR	Mount	Contact
	FCT-3M-A	3215 2-SMD	32.768 kHz	±10 ppm	-40 to +125℃	6 - 12.5 pF	70 KΩ	SMD	Inquiry

Matched a series? Here's what comes next.

Once you’ve narrowed it down, the real work is confirming it works on your board not just on the datasheet. To advance your prototype manufacturing, we offer the following support:

Phase 01 // Product Selection

Download Selection Guide

Compare 19 series of 32.768 kHz tuning fork crystals by package, tolerance, temperature, load capacitance and ESR.

Phase 02 // Engineering

Validate Circuit Match

Submit your target parameters and IC model. Our laboratory verifies drive-level margins, startup conditions, and negative resistance stability.

Full-Cycle Engineering Services

Beyond standard verification, our laboratory provides complete technical support throughout your entire product lifecycle:

Contact an FCom Engineer