FCO-2C-LE Low-EMI Spread-Spectrum XO
SMD 2.5×2.0mm, Low EMI, SSXO
FEATURE
Product Description
FCO-2C-LE — Low-EMI SMD CMOS Crystal Oscillator
Compact 2.5×2.0×0.81 mm XO with built-in spread-spectrum options to help pass EMC with margin. Designed for space-constrained clock trees where peak emissions and coupling into RF/IF paths can become the real bottleneck.
FCO-2C-LE integrates spread-spectrum clocking to lower peak emissions and ease system-level EMC. It supports down spread and center spread options with a modulation carrier of 20–52 kHz, delivers CMOS output up to 15 pF loads, and operates from 1.8/2.5/3.3 V rails. It is commonly used in products that combine high-speed digital switching with sensitive RF or video paths—where a “cleaner” clock peak makes compliance and coexistence easier.
Learn the basics: what is a clock oscillator, how a quartz oscillator works, and oscillator electronics applications.
Key Features
- Low-EMI spread-spectrum options to reduce peak emissions and improve EMC margin.
- Fast start-up (≤ 5 ms) for quick boot, power cycling and standby-to-active transitions.
- Multi-Vdd support (1.8 V / 2.5 V / 3.3 V) for modern SoC/PHY clock domains.
- OE tri-state for power management and clock gating with predictable behavior.
- Compact 2.5×2.0×0.81 mm footprint for dense layouts and short clock routes.
Unless otherwise noted: typical evaluation at 25 ± 5°C, 40–70% RH.
Detailed Specifications
| Parameters | Symbol | 1.8 V | 2.5 V | 3.3 V | Notes |
|---|---|---|---|---|---|
| Frequency Range | F | 16–40 MHz | Standard 24/25 MHz options | ||
| Output Type / Load | — | CMOS / 15 pF | — | ||
| Current Consumption (min/max) | Icc | 1.5 / 4 mA | 2.5 / 5 mA | 2.5 / 6 mA | Vdd dependent |
| Rise / Fall Time | Tr/Tf | 5 ns / 5 ns | @20%–80% Vdd | ||
| Standby Current (OE=GND) | Icc(ST) | ≤ 1.2 mA | Tri-state disable | ||
| Output High / Low | VoH / VoL | ≥ 90% Vdd / ≤ 10% Vdd | — | ||
| OE Enable / Disable Threshold | VIH / VIL | ≥ 70% Vdd / ≤ 30% Vdd | Pin 1 input | ||
| Duty Cycle | TH/T | 45–55% | — | ||
| Start-up Time | Tosc | ≤ 5 ms | t=0 to 90% Vdd | ||
| Aging (first year) | — | ±3 ppm/year | @25°C | ||
| Modulation Carrier Freq. | Mf | 20–52 kHz | Reference F0 | ||
Test conditions unless noted: 25 ± 5°C, 40–70% RH.
Applications (and why low-EMI matters)
- IP cameras: reduce clock-peak energy that can couple into RF modules and impact EMC tests.
- LED modules: help control radiated emissions on long harnesses and high-current switching boards.
- Media players: mitigate interference into tuners/audio paths while keeping clock integrity.
- Surveillance electronics: predictable boot timing and lower emission peaks in dense multi-board systems.
More application guidance: oscillator clock applications, networking & storage clocking, oscillators in 5G telecom.
Frequency Stability vs. Temperature Range
| Temperature Range | ±25 ppm | ±50 ppm |
|---|---|---|
| −20 ~ +70°C | Available | Available |
| −40 ~ +85°C | Available | Available |
| −40 ~ +105°C | — | Available |
| −40 ~ +125°C | — | Check availability |
The table summarizes common options; contact sales for special requirements. For definitions of stability, duty cycle, and other terms, see our crystal oscillator parameter guide.
Related application notes:
Spread-Spectrum Options
| Spread Type | Values |
|---|---|
| Down Spread | −2.00%, −1.50%, −1.00%, −0.80% |
| Center Spread | ±1.00%, ±0.75%, ±0.50%, ±0.40% |
Typical EMI reduction: ~7–15 dB when applied appropriately.
Design Notes
- Place a 0.1 μF bypass capacitor as close as possible between Vdd and GND pads.
- Keep the XO output trace short; avoid routing near aggressive switching nodes.
- Confirm system timing margin when selecting spread type/amount and modulation carrier.
- Comparing technologies? See crystal vs MEMS oscillators and Pierce oscillator basics.
Ordering Code / Options
Specify frequency, stability, temperature range, Vdd, spread type/amount, and output enable requirements. Example: FCO-2C-LE, 25.000 MHz, ±50 ppm, −40~+105°C, 3.3 V, Down −1.0%.
Selection Path / Upgrade Options
If you need a drop-in alternative, start here: FCO-2C (baseline), FCO-2C-HP (higher precision), FCO-2C-UP (ultra-low power), FCO-2C-WT (wide temperature), or browse the Low-EMI FCO-C-LE series. For selection fundamentals, see Crystal-Controlled Oscillators overview and what is an oscillator in electronics.
Compare Related Models
- FCO-2C — standard 2.5×2.0 mm CMOS XO
- FCO-2C-HP — higher precision option
- FCO-2C-UP — ultra-low power option
- FCO-2C-WT — wide-temperature option
- Want a broader family view? See XO clock oscillator family (industrial & automotive).
Documents & Downloads
Download the datasheet for full electrical limits, pin assignment, recommended land pattern, and ordering options. If you need compliance documentation for a project gate, include your target standard and test setup in the RFQ.
Helpful knowledge links: how crystal oscillators work, load capacitance & drive level, Barkhausen criterion tips.
Need a specific footprint or pinout confirmation? Send your PCB constraints to technical support.
FAQ
How does FCO-2C-LE reduce EMI?
It uses spread-spectrum clocking (down or center spread) to distribute spectral energy and lower peak emissions, typically improving EMC margin in real systems when the spread option is selected appropriately.
What spread-spectrum options are available?
Down spread: −2.00%, −1.50%, −1.00%, −0.80%. Center spread: ±1.00%, ±0.75%, ±0.50%, ±0.40%. Modulation carrier frequency is 20–52 kHz (ref F0).
What stability and temperature options can I choose?
±25 ppm is available over −20~+70°C and −40~+85°C. ±50 ppm is available over −20~+70°C, −40~+85°C, and −40~+105°C. Contact us for extended ranges.
Any layout recommendations?
Place a 0.1 μF bypass capacitor as close as possible between Vdd and GND pads. Keep the output trace short and avoid routing near aggressive switching nodes to reduce coupling.
How do I use the OE/tri-state pin?
Drive OE high (≥70% Vdd) to enable output; drive low (≤30% Vdd) to disable to high-impedance. Standby current depends on Vdd and configuration.
What is the MOQ and lead time?
MOQ and lead time depend on frequency, stability/temperature grade, voltage and spread option. We support samples and volume production; contact us for a fast RFQ with your target spec and quantity.
Can I get samples and engineering support?
Yes. We provide samples for evaluation and FAE support on spread selection, layout and EMC validation. Share your target standard (CISPR/EN class), board constraints and clock tree requirements.
Do you support customization (frequency, stability, packaging, labeling)?
Yes. We can customize frequency, stability/temperature grade, spread amount/type and packing/labeling. Provide your application constraints and compliance target for a recommended build.
Why is pricing not listed on the page?
This is a B2B part with multiple build options (frequency, grade, voltage, spread). Pricing is quote-based to match your exact configuration and volume. Use the RFQ form or contact us for a quick quote.
Support & Certifications
For application engineering support (clock tree, spread selection, layout review and EMC troubleshooting), contact our technical support team.
Specifications are subject to change; verify critical parameters with our sales/FAE team prior to ordering.
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