What load capacitance (CL) should I choose for FCT-3T?

Select CL to match your oscillator’s effective load requirement. FCT-3T supports CL options of 6, 7, 9, and 12.5 pF (or specify). If you need help matching CL to your MCU/RTC oscillator, contact FCom@fujicrystal.com.

What is the maximum drive level for FCT-3T?

The maximum drive level is 1.0 µW. Staying below the drive limit helps preserve long-term stability and avoid crystal stress.

FCT-3T 32.768kHz φ3×8mm RTC Crystal

Q: What operating temperature range does FCT-3T cover?

FCT-3T supports −40 to +85 °C operating temperature (Topr). Tolerance may be specified over −20 to +70 °C or −40 to +85 °C depending on your requirement.

Q: Do you provide samples and what is the lead time?

Yes—samples are available for evaluation. Lead time depends on option set (CL/tolerance/packaging) and volume. Send your target spec and quantity to FCom@fujicrystal.com for the latest schedule.

Q: What is the MOQ and do you publish pricing?

Pricing is provided via RFQ to match your exact specification and volume. MOQ varies by option and supply plan (sample, pilot, mass production). Contact us with your requirements for a fast quote.

Q: Can FCT-3T be customized (CL, tolerance, packaging, test report)?

Yes. In addition to common CL (6/7/9/12.5 pF) and tolerance options, we support specification matching for projects that need custom requirements. Tell us your oscillator conditions, temperature range, and compliance/test documentation needs.

Key Features

FCT-3T is a 32.768 kHz tuning fork quartz crystal targeted at RTC/reference clock use-cases. It supports multiple load capacitance and tolerance options for mainstream consumer and industrial designs. For selection guidance, see our 32.768 kHz RTC Crystal Guide for Industrial, Auto & Medical and the RTC Crystal Family (Industrial / Automotive / Medical).

Why FCT-3T

Small cylinder package: φ3×8 mm
Designed for cost-efficient mass production
Low-power RTC/reference clock use-cases with stable long-term behavior
RoHS and REACH compliant, Pb-free
Common applications: PCs and consumer products reference clocks

Key Specs

Key specs are measured under standard conditions (typically 25 ± 5°C unless otherwise noted). See Detailed Specifications for full test conditions.

Nominal frequency

32.768 kHz

Operating temperature

−40 to +85 °C

Frequency tolerance (options)

±5 / ±10 / ±20 ppm

Load capacitance (options)

6 / 7 / 9 / 12.5 pF

Max ESR

30 kΩ

Max drive level

1.0 µW

Detailed Specifications

All specifications are per datasheet common spec and test conditions. For custom requirements, please contact our sales team.

Parameter	Symbol	Min.	Typ.	Max.	Units	Notes
Nominal Frequency	F		32.768		kHz
Frequency Tolerance (at 25°C)	FT		±5, ±10, ±20		ppm	@ −20 to +70°C
Frequency Tolerance (at 25°C)	FT		±5, ±10, ±20		ppm	@ −40 to +85°C
Operating Temperature	Topr	−40	25	85	°C
Load Capacitance	CL	6, 7, 9, 12.5 or specify			pF
Drive Level	DL			1.0	µW
Equivalent Series Resistance	ESR			30	kΩ
Shunt Capacitance	C0	1.65 – 1.75			pF
Temperature Coefficient	—	−0.035 ± 0.01			ppm/T²
Insulation Resistance	—	500			MΩ	DC 100V ± 15V
Aging	—		±3		ppm	1st year
Test Conditions	—	Ambient temperature: 25 ± 5°C; Relative humidity: 40% to 70%

Note: The table shows common specification. If you have special specification requirements, please contact our salesperson.

Package Outline & Dimensions

Mechanical outline is provided for layout and mechanical clearance. If your design uses formed leads, confirm the target footprint and assembly process with our team.

FCT-3T package outline and lead / pin configuration drawing for the φ3×8mm cylinder tuning fork crystal. — Package outline & lead / pin configuration (mm).

Applications

PC reference clocks
Consumer products reference clocks
General RTC timekeeping circuits (MCU/RTC oscillator inputs)
Industrial sensors, meters, gateways (stable low-power time base)
Automotive modules requiring robust RTC timing (spec-driven selection)
Medical/portable electronics requiring consistent timekeeping

Why these specs matter: RTC oscillators are sensitive to ESR/start-up margin and CL matching. Use FCT-3T when you need a proven 32.768 kHz cylinder solution with clear option sets for volume programs. For circuit-level selection, see Tuning-Fork vs AT-cut: Choosing the Right Quartz for Low Power.

For smaller footprints and reflow assembly, you may also compare our SMD tuning fork crystal family (e.g., 2.0×1.2 mm and 1.2×1.0 mm) based on your RTC oscillator start-up margin and PCB area.

If you are migrating from legacy 32.768 kHz cylinder parts, reference our drop-in guides: MC-306 NRND Drop-In Replacement and MC-146 NRND Drop-In Replacement.

Ordering Code / Options

Standard Options

Frequency: 32.768 kHz
Package: Cylinder, φ3×8 mm
Load capacitance (CL): 6 / 7 / 9 / 12.5 pF (or specify)
Frequency tolerance (25°C): ±5 / ±10 / ±20 ppm
Operating temperature: −40 to +85 °C (or specify)
ESR: up to 30 kΩ (verify oscillator start-up margin)
Supply mode: samples, pilot builds, mass production; customization available

Selection Path / Upgrade Options

If you are choosing a 32.768 kHz RTC crystal for long lifecycle programs, use the links below to align CL/ESR margin, temperature requirement, and supply planning.

For option confirmation (CL, tolerance over temperature, lead form, packaging, and test report), email FCom@fujicrystal.com.

Downloads

Related Products & Resources

If you are comparing footprint, stability, and assembly options for a 32.768 kHz RTC crystal, the pages below provide common alternatives and selection guidance.

Datasheet: FCT-3T 32.768kHz tuning fork crystal (φ3.0×8.0mm).pdf

Design Notes (Implementation Guidance)

Load capacitance (CL): choose CL to match your oscillator’s effective load. If external capacitors are used, include PCB stray capacitance in the calculation.
Drive level: keep drive power ≤ 1.0 µW to avoid long-term drift or crystal damage.
ESR margin: verify that the oscillator has sufficient start-up margin with ESR up to 30 kΩ.
Layout: place the crystal close to the MCU/RTC pins, keep traces short and symmetric, and guard against high-noise nets.

FAQ

What load capacitance (CL) options are supported?

Common CL options are 6, 7, 9, and 12.5 pF, or you can specify your requirement when ordering.

What operating temperature range does FCT-3T cover?

−40 to +85 °C (Topr).

What is the maximum allowable drive level?

1.0 µW maximum drive level (DL).

Do you provide samples and what is the lead time?

Yes—samples are available. Lead time depends on option set (CL/tolerance/packaging) and volume. Email your target spec and quantity to FCom@fujicrystal.com.

What is the MOQ and do you publish pricing?

We provide quotes via RFQ to match your exact specification and volume. MOQ varies by option and supply plan (sample, pilot, mass production). Contact us with your requirements for a fast quote.

Can FCT-3T be customized (CL, tolerance, packaging, test report)?

Yes. Beyond common options, we support specification matching for projects that need custom requirements and documentation. Share your oscillator conditions, temperature range, and compliance/report needs.

Does FCT-3T support custom specifications?

Yes. The datasheet lists common specifications. For special requirements, please contact our sales team.

Is FCT-3T RoHS/REACH compliant?

Yes. FCT-3T is RoHS and REACH compliant and is Pb-free.

FCT-3T 32.768 kHz Tuning Fork Crystal