Tuning Fork Crystal · Cylinder Type

FCT-2T 32.768kHz RTC Tuning Fork Crystal (Φ2×6mm)

A 32.768kHz reference crystal for RTC tuning-fork oscillator circuits and consumer reference clocks. Designed for low-power oscillators with standard CL options and stable performance across industrial temperature. For system-level selection, see our timing devices overview.

32.768 kHz Cylinder Φ2×6 mm -40 to +85 °C operation CL 6/7/9/12.5 pF (or specified) ESR ≤ 40 kΩ Drive level ≤ 1.0 µW RoHS / REACH / Pb-free

Test conditions: 25 ± 5°C; RH 40%–70% unless otherwise specified.

Request Quote Ordering Guide Datasheet
FAQ

FCT-2T 32.768kHz RTC tuning-fork crystal, cylinder Φ2×6mm — Product image of FCT-2T (Φ2×6mm cylinder package).

Downloads & Resources

Datasheet (PDF): FCT-2T 32.768kHz Tuning Fork Crystal
Category hub: Tuning Fork Crystals
Product family: RTC Crystal Family (Industrial / Automotive / Medical)
Application guide: 32.768 kHz RTC Crystal Guide for Industrial, Auto & Medical
Knowledge (Why 32.768 kHz): Why 32,768 Hz Rules: From Quartz Watches to RTCs
Knowledge (Selection): Tuning-Fork vs AT-cut: Choosing the Right Quartz for Low Power
Drop-in migration guides: MC-306 NRND Drop-In Replacement | MC-146 NRND Drop-In Replacement

Recommended RFQ attachments

Please attach your BOM line (CL / tolerance / temp range / lead form), any PCB footprint constraints, and inspection documentation requirements.

Features & Value

Compact cylinder package: Φ2×6 mm for space-constrained RTC designs.
Low-power ready: maximum drive level 1.0 µW, suitable for typical RTC oscillator ICs.
CL options: 6 / 7 / 9 / 12.5 pF (or customer-specified) to match common RTC inputs.
Wide operating range: -40 to +85 °C for consumer and industrial environments.
Compliance: RoHS and REACH compliant, Pb-free.

Typically specify

Series (FCT-2T), frequency (32.768 kHz), CL option, frequency tolerance + temperature range, lead form (straight or formed), and requested inspection documentation.

Electrical Specifications

Values below represent common catalog specifications. For tighter tolerances or special requirements, contact sales.

Parameter	Symbol	Typical / Limit	Units	Notes
Nominal frequency	F	32.768	kHz	Reference clock for RTC
Frequency tolerance (over temperature)	FT	±5 / ±10 / ±20	ppm	Option A: -20 to +70 °C; Option B: -40 to +85 °C
Operating temperature	Topr	-40 to +85	°C
Load capacitance	CL	6 / 7 / 9 / 12.5 (or specified)	pF	Match RTC oscillator input requirement
Drive level (maximum)	DL	1.0 (max)	µW	Keep within limit to prevent aging / fracture
Equivalent series resistance	ESR	40 (max)	kΩ
Shunt capacitance	C0	1.5–0.85	pF	Typical range (by lot / measurement setup)
Temperature coefficient	—	-0.035 ± 0.01	ppm/°C²	Typical tuning-fork parabolic behavior
Insulation resistance	—	≥ 500	MΩ	DC 100V ± 15V
Aging	—	±3 (typ.)	ppm	1st year
Test condition	—	25 ± 5°C; RH 40%–70%	—	Catalog test reference

Mechanical Outline

Item	Typical	Units
Body diameter	Φ2.0 ± 0.1	mm
Body length	6.0 ± 0.2	mm
Lead diameter	Φ0.25 ± 0.05	mm
Lead length (straight)	6.0 min	mm
Lead standoff (formed option)	0.7 ± 0.2 (reference)	mm
Lead spacing (formed option)	2.54 ± 0.3 (reference)	mm

For PCB footprint definition (through-hole pitch, keep-out, and forming), share your target land pattern or assembly constraints with us.

FCT-2T lead form and pin layout drawing for Φ2×6mm cylinder tuning fork crystal — Lead / pin diagram of the FCT-2T.

Typical Applications

Real-time clock (RTC) reference oscillators
Consumer products reference clocks
Wearables, meters, remote controls, and IoT endpoints
Low-power timekeeping for battery-powered devices

Selection tips

Choose the CL that matches your oscillator IC; specify tolerance over your temperature range; keep drive level below 1.0 µW; confirm lead form for your assembly flow.

Need smaller SMD options? See FCT-2M (2.0×1.2mm SMD).

Ordering Guide

Template

FCT-2T / 32.768 kHz / CL=__ pF / FT=±__ ppm over (__ to __ °C) / Lead form: __ / Qty: __ / Required docs: __

Common FT options: ±5 / ±10 / ±20 ppm over -20~+70°C, or ±5 / ±10 / ±20 ppm over -40~+85°C.

Checklist

CL: 6 / 7 / 9 / 12.5 pF (or specified)
Frequency tolerance: ppm + temperature range (must both be specified)
Lead form: straight vs formed (per your assembly)
Compliance: RoHS/REACH; request CoC if needed
Inspection docs: outgoing inspection report / sampling plan (if required)

Selection Path / Upgrade Options

If you are migrating from legacy RTC crystals or need a footprint change, start from the RTC Crystal Family, review the 32.768 kHz selection guide, and use our drop-in migration notes when replacement compatibility is required.

Engineering Notes

Load capacitance (CL) and external capacitors

For a Pierce oscillator with two external capacitors, the effective load seen by the crystal is approximately:
CL ≈ (C1 × C2) / (C1 + C2) + Cpar
where Cpar is total parasitic capacitance (PCB + pins + package). Choose C1/C2 to meet the crystal’s specified CL.

Drive level management

Maintain crystal drive below 1.0 µW. Excessive drive can accelerate aging or induce mechanical stress. If your RTC IC supports drive strength settings, start low and validate start-up margin across temperature.

ESR and start-up margin

With a maximum ESR of 40 kΩ, ensure your oscillator IC supports this ESR class for 32.768 kHz tuning fork crystals. Validate start-up at cold temperature and at end-of-life battery voltage.

Layout and mechanical handling

Keep oscillator loop traces short; isolate from fast edges and RF aggressors.
Avoid PCB bending stress near the crystal leads; keep a small keep-out around the package.
Confirm lead forming requirements early (assembly tooling impacts dimensional targets).

FAQ

What load capacitance (CL) options are available for FCT-2T?

Common CL options are 6, 7, 9, and 12.5 pF. Customer-specified CL is also available upon request.

Which frequency tolerance should I specify on my PO?

Specify both ppm and temperature range. Common options are ±5/±10/±20 ppm over -20~+70°C, or ±5/±10/±20 ppm over -40~+85°C.

Is this crystal RoHS/REACH compliant?

Yes. FCT-2T is RoHS and REACH compliant and Pb-free.

Can I request samples and what is the typical lead time?

Yes—samples are available for qualification. Lead time depends on CL option, tolerance, lead form, and order volume. Email FCom@fujicrystal.com with your target spec and quantity for a confirmed schedule.

Do you support customization (CL/tolerance/lead forming)?

Yes. We can support custom CL, tighter tolerance packages, temperature requirements, lead forming, and documentation requests based on your application and qualification plan.

What documents can be provided for B2B procurement?

Typical documents include RoHS/REACH statements, Certificate of Conformance (CoC), and outgoing inspection information upon request. Share your vendor requirements when you RFQ.

Need samples, a quote, or a tighter spec?

Email FCom@fujicrystal.com with your target CL, tolerance, temperature range, lead form, and quantity. We will confirm availability, lead time, and documentation.

Request Samples Review Specs Technical Support

Quality & Engineering Support

We support design-in reviews (oscillator startup margin, CL matching, layout guidance) and B2B documentation workflows. Certifications: ISO9001 | ISO14001.