FCO-2K-UC 32.768 kHz 1.4 µA RTC Oscillator for IoT
SMD 2.5×2.0mm, Ultra Low Current 32.768kHz
FEATURE
Product Description
FCO-2K-UC — 32.768 kHz Ultra-Low Current SMD Oscillator (2.5×2.0 mm)
Ultra-low current 32.768 kHz CMOS oscillator for battery-powered systems (RTC / always-on domains / wearables). RoHS/REACH compliant.
Looking for background fundamentals? Start with what is a clock oscillator, how quartz oscillators work, and start-up time.
Overview
The FCO-2K-UC is a 32.768 kHz ultra-low current CMOS crystal oscillator in a compact 2.5×2.0×0.81 mm SMD package. Designed for coin-cell and wearable platforms, it delivers 1.4 μA typical current at no load with tight accuracy of ±10 ppm at 25 °C and ±25 ppm over −40~+85 °C. A fast ≤ 8 ms start-up ensures reliable RTC initialization after sleep.
- Optimized for RTC reference clocks and always-on domains
- Low jitter CMOS levels: VoH ≥ 0.9×Vdd, VoL ≤ 0.1×Vdd
- Robust operation across voltage/load variation and 1st-year aging
For best performance, place a 0.1 μF bypass capacitor close to Vdd–GND pads.
Key Features
- Nominal frequency: 32.768 kHz
- Supply options: 1.5 V, 1.8 V
- Current: 1.4 μA typ, 1.8 μA max (no load)
- Accuracy: ±10 ppm @25 °C
- Stability: ±25 ppm, −40~+85 °C (inclusive)
- Timing: ≤ 8 ms start-up; 45–55% duty
- Edges: ≤ 10 ns rise/fall (10%–90%)
- Compliance: RoHS & REACH; Pb-free
Key Specs
Test conditions are per datasheet (typical @ 25 °C unless noted). For tighter screening or special lots, please contact us.
Power
- 1.4 μA typ (no load)
- 1.5 V / 1.8 V supply options
- Ideal for coin-cell RTC domains
Accuracy & Stability
- ±10 ppm @ 25 °C
- ±25 ppm over −40~+85 °C (inclusive)
- Includes 1st-year aging, shock, vibration
Integration
- 2.5×2.0×0.81 mm SMD
- ≤ 8 ms start-up time
- CMOS levels for easy MCU/PMIC interfacing
Package Outline
Use the package drawing for footprint and pad layout reference.
Why these specs matter
In always-on RTC domains, every microamp counts. The ultra-low current of FCO-2K-UC extends battery life while keeping accurate time across temperature, voltage, and real-world mechanical stress. Fast start-up helps systems resume quickly after deep sleep.
Related reading: oscillator parameters and aging.
Typical Applications
RTC & Always-On
Real-time clocks in low-power MCUs and PMIC keep-alive domains. See oscillator electronics applications.
Wearables & Health
Smart bands, watches, wellness monitors needing multi-year battery life. Explore oscillator clock applications.
IoT Sensors & Trackers
Asset trackers, BLE beacons, smart meters, and portable loggers where low current is critical. Reference: test & measurement timing.
More application guides: networking & storage oscillator electronics and oscillator in 5G telecom.
Detailed Specifications
| Parameter | Symbol | Min | Typ | Max | Units | Notes |
|---|---|---|---|---|---|---|
| Nominal Frequency | F | 32.768 | kHz | Test @ 25±5 °C, RH 40–70% | ||
| Frequency Tolerance | FT | ±10 | ppm | @ 25±3 °C | ||
| Supply Voltage | Vdd | 1.5 | 1.5 / 1.8 | 1.8 | V | Typical options |
| Stability vs Temp | FS | ±25 | ppm | −40~+85 °C (inclusive) | ||
| Current Consumption | Icc | 1.4 | 1.8 | μA | @ no load | |
| Output High Level | VoH | 0.9×Vdd | V | |||
| Output Low Level | VoL | 0.1×Vdd | V | |||
| Rise / Fall Time | Tr / Tf | 10 | ns | 10%–90% | ||
| Duty Cycle | TH/T | 45 | 55 | % | ||
| Start-up Time | Tosc | 8 | ms | |||
| Aging (1st year) | — | ±3 | ppm/yr | @ 25 °C |
Inclusive of calibration @25 °C, operating temperature range, input voltage variation, load variation, aging (1st year), shock, and vibration.
Frequency Stability vs Temperature Range
| Spec Option | −20~+70 °C | −40~+85 °C | −40~+105 °C |
|---|---|---|---|
| ±20 ppm | ○ Available | × Not available | × Not available |
| ±25 ppm | ○ Available | ○ Available | △ Conditional |
| ±50 ppm | ○ Available | ○ Available | ○ Available |
“Conditional” indicates feasibility subject to frequency & lot—contact FCom for confirmation.
Design & PCB Guidelines
- Decoupling: place a 0.1 μF ceramic capacitor close to the device between Vdd and GND pads.
- Keep the output trace short and isolated from noisy/high-slew nets to minimize coupled jitter.
- Use a continuous ground reference under the part; avoid splits under the output pin.
Background reading: what is an oscillator in electronics?
Ordering Code / Options
Standard configuration: 32.768 kHz, 1.5 V or 1.8 V supply, stability options per matrix above.
| Part Number | Description |
|---|---|
| FCO-2K-UC | 32.768 kHz, ultra-low current CMOS oscillator, 2.5×2.0×0.81 mm, RoHS/REACH |
For special specs (stability, temperature range, screening), contact sales.
Selection Path / Upgrade Options
- Need a broader oscillator portfolio (MHz range, industrial/automotive options)? See XO clock oscillator family.
- Comparing oscillator architectures? Review how crystal oscillators work and crystal-controlled oscillator overview.
- Need selection help (accuracy, load, aging, start-up)? Use selecting a timing device and parameters & tradeoffs.
Request Samples & Quotation
Share your target voltage (1.5 V or 1.8 V), stability/temperature range, and annual volume. Our team will respond quickly. Pricing is provided via B2B RFQ (price on request).
Application engineering support is available for footprint review, timing budget, and reliability documentation (CoC/CoA, test reports) upon request.
FAQ
What is the typical current consumption of FCO-2K-UC?
Typical 1.4 μA at no load; max 1.8 μA (datasheet conditions).
What stability can I expect over −40~+85 °C?
±25 ppm inclusive of calibration @25 °C, operating temperature range, voltage/load variation, 1st-year aging, shock, and vibration (see datasheet).
How fast does the oscillator start?
Maximum start-up time is 8 ms.
Do you offer samples, customization, and volume production?
Yes. We support samples, mass production, and customization (stability/temperature screening, voltage options, documentation) based on your project requirements.
What are MOQ and lead time?
MOQ and lead time depend on specification options and production schedule. Contact us with target specs and annual volume for a fast quotation and lead-time confirmation.
Is pricing available online?
Pricing is available on request (B2B RFQ). Please share your target spec and volume for a formal quote.
Any PCB design recommendation?
Place a 0.1 μF bypass capacitor as close as possible between Vdd and GND pads, keep the output trace short, and use a continuous ground reference under the device.
© FCom Fuji Crystal. Specifications are subject to change; verify with the latest datasheet before design freeze.
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