FCT-1M 32.768kHz 1610 SMD RTC Crystal
SMD 1.6 x 1.0 mm, 32.768kHz, AEC-Q200
FEATURE
Product Description
FCT-1M — 32.768 kHz SMD Tuning Fork RTC Crystal (1.6×1.0 mm)
FCT-1M is an industry-standard 1.6×1.0×0.5 mm SMD tuning fork crystal for low-power RTC timekeeping in sleep or low-energy modes. It offers common load-capacitance options and controlled ESR to support start-up margin verification in compact always-on clock domains.
Overview
For design engineers
- Nominal frequency: 32.768 kHz (RTC time base)
- Load capacitance options: 6 / 7 / 9 / 12.5 pF (or specify)
- ESR (max): 90 kΩ to support oscillator start-up margin verification
- Drive level: 0.5 µW (control drive for reliability)
- Operating temperature options up to -40 to +125 °C
For procurement & program teams
- Industry-standard footprint: 1.6×1.0×0.5 mm SMD package
- Compliance: RoHS & REACH, Pb-free (documentation available on request)
- Clear RFQ inputs (CL + temperature option + tolerance + volume) reduce quoting cycle time
- Engineering support available to cross-check ESR/drive margin with your RTC/MCU
Key Features
Product highlights
- Industry-standard package: 1.6×1.0×0.5 mm
- High reliability environmental performance
- High frequency stability and high precision
- RoHS and REACH compliant, Pb-free
What this enables
- Compact RTC “always-on” island in dense PCBs
- Low-energy mode timekeeping robustness with controlled ESR
- Common CL options aligned to typical RTC/MCU oscillator networks
Key Specs
Quick view (confirm grade-specific test conditions and limits in the official PDF).
Ordering Options
If you require special screening, customized CL, or unique requirements, include them in your RFQ for feasibility review.
| Selection Field | What to Specify | Why It Matters |
|---|---|---|
| Model | FCT-1M | Locks package family and baseline electrical limits |
| Frequency | 32.768 kHz | RTC time base frequency |
| Load Capacitance (CL) | 6 / 7 / 9 / 12.5 pF (or specify) | Must match effective load at RTC pins to hit accuracy targets |
| Operating Temperature Option | -40~85°C, -40~105°C, or -40~125°C (option dependent) | Defines validation corners and tolerance grade set |
| Tolerance @ 25°C | ±5/±10/±20 ppm (@-40~85°C); ±10/±20/±30 ppm (@-40~105°C or @-40~125°C) | Maps to timekeeping error budget |
| Annual Volume | ____ pcs/year | Supports lead-time planning and pricing |
Selection Path / Upgrade Options
If you need a different footprint or qualification profile, compare adjacent options and family guidance: FCT-2M (2.0×1.2mm), FCT-2T (tuning-fork RTC), RTC Crystal Family, 32.768kHz Selection Guide.
Design Tips (32k “quiet island” essentials)
Load capacitance selection
Match the crystal CL to the effective load seen at the RTC/MCU pins:
Include internal capacitors (if present) and PCB stray capacitance.
Start-up margin & ESR
- Confirm oscillation start-up across temperature and supply corners.
- Check negative resistance margin versus ESR (max 90 kΩ).
- Validate wake-from-sleep behavior; 32k domains are noise-sensitive.
Drive level control
- Keep oscillator drive within the specified drive level (0.5 µW).
- Excess drive can increase aging and long-term drift.
PCB layout guidance
- Place crystal close to RTC/MCU pins; keep traces short and symmetric.
- Avoid routing near DC/DC switch nodes, fast clocks, RF lines, or high-current loops.
- Maintain a continuous ground reference and avoid crossing plane splits.
Detailed Specifications
Typical conditions and options depend on the selected grade. Refer to the official PDF for the full table and test conditions.
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Notes |
|---|---|---|---|---|---|---|
| Nominal Frequency | F | 32.768 | kHz | RTC time base | ||
| Frequency Tolerance (at 25°C) | FT | ±5 / ±10 / ±20 | ppm | @ -40~85°C option | ||
| ±10 / ±20 / ±30 | ppm | @ -40~105°C option | ||||
| ±10 / ±20 / ±30 | ppm | @ -40~125°C option | ||||
| Operating Temperature | Topr | -40 | 25 | 125 | °C | Option dependent |
| Load Capacitance | CL | 6, 7, 9, 12.5 (or specify) | pF | Match to RTC network | ||
| Drive Level | DL | 0.5 | 0.5 | µW | Control drive for reliability | |
| Equivalent Series Resistance | ESR | 90 | kΩ | Max. | ||
Applications
Typical use cases
- Real Time Clock (RTC) time base
- System sleep mode / low-energy mode timekeeping
Where it fits best
- MCUs / PMICs / dedicated RTC ICs needing compact 32k domain
- Wearables, sensors, mobile accessories, industrial nodes requiring low-power keep-alive timing
- Designs standardizing on 1.6×1.0×0.5mm for second-sourcing flexibility
Application + selection references: Industrial/Automotive/Medical RTC Crystal Guide.
Package & Dimensions
FCT-1M uses an industry-standard 1.6×1.0×0.5 mm SMD package. Refer to the dimension drawing for connection orientation and recommended PCB layout.
Mechanical summary
- Footprint class: 1.6×1.0 mm
- Height class: 0.5 mm
- 2-pad SMD, connection #1 / #2 (see drawing)
Please verify the CDN URL for the FCT-1M dimensions image.
Resources
Engineering quick-check
- Confirm effective CL at pins and select correct CL option
- Verify negative resistance margin vs ESR max 90 kΩ
- Confirm drive level compliance (0.5 µW)
- Validate cold start + wake-from-sleep oscillation behavior
Guides & Knowledge
- 32.768 kHz RTC Crystal Guide for Industrial, Auto & Medical
- Why 32,768 Hz Rules: From Quartz Watches to RTCs
- Tuning-Fork vs AT-cut: Choosing the Right Quartz for Low Power
- MC-306 (32.768 kHz) NRND Drop-In Replacement / Design Guide
- MC-146 (32.768 kHz) NRND Drop-In Replacement / Design Guide
Quick Links
Get Pricing & Samples
RFQ / sample request checklist
- Model: FCT-1M
- Frequency: 32.768 kHz
- CL target: 6 / 7 / 9 / 12.5 pF (or specify)
- Operating temperature option: -40~85°C or -40~105°C or -40~125°C
- Tolerance target: ±5/±10/±20 ppm or ±10/±20/±30 ppm (depends on temp option)
- Annual volume: ____ pcs
- Target first-build date: ____
- RTC/MCU part number (recommended): ____ (to confirm ESR/drive margin quickly)
Procurement-friendly description (copy/paste)
| Field | Meaning | Example |
|---|---|---|
| Part | Model | FCT-1M |
| Frequency | Nominal | 32.768 kHz |
| Package | Footprint / height class | 1.6×1.0×0.5 mm SMD |
| CL | Load capacitance option | CL12.5 pF |
| Tolerance | At 25°C (grade) | 20 ppm |
| Temp option | Operating range | -40~105°C |
FAQ
How do I select CL for FCT-1M?
Choose the CL option that matches the effective load at the RTC/MCU pins: CL ≈ (C1×C2)/(C1+C2) + Cstray. Include internal capacitors (if present) and PCB parasitics. When uncertain, validate adjacent CL options during EVT to reduce first-pass risk.
What ensures reliable start-up?
Verify negative resistance margin versus ESR (max 90 kΩ) across temperature and supply corners, and keep the 32k traces short/symmetric and away from switching noise sources.
What’s the specified drive level?
The specified drive level is 0.5 µW. Ensure your RTC oscillator does not exceed this level.
Do you offer samples, production supply, and customization?
Yes. We support samples, production supply, and customization such as CL options, temperature grades, and screening. For a fast review, share your target CL, operating temperature, and the RTC/MCU part number.
What are typical MOQ and lead time?
MOQ and lead time depend on the selected option (CL, temperature grade, tolerance) and inventory status. Send your exact option and annual volume for a confirmed MOQ/lead-time quote.
Can you provide packing info and test reports (RoHS/REACH/CoC)?
Yes. Packing details, RoHS/REACH statements, CoC, and traceability documents are available on request. Include documentation needs in the RFQ.
Where is the official datasheet?
Download the official PDF here: FCT-1M 32.768kHz tuning fork crystal (PDF).
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