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FOC-6S OCXO ±10 ppb Low Phase Noise for Telecom Sync

SMD 25.4×22.1mm

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OCXOs

FEATURE

Explore the FOC-6S OCXO from FCom Fuji Crystal — a compact 25.4×22.1mm oven-controlled crystal oscillator with ±10 ppb stability, ideal for synchronization, test systems, and frequency sources.

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Datasheet

Product Description

FOC-6S OCXO | Oven Controlled Crystal Oscillator (25.4×22.1 mm)

Q: How long does warm-up take to reach final stability?

Typical ±10 ppm within 2 minutes at +25°C (reference 1 hour). Warm-up curves are provided in the datasheet.

Compact low-phase-noise OCXO with ±10 ppb stability for telecom synchronization and precision test systems.

Built for stable holdover and cleaner close-in phase noise where network timing, frequency synthesis, and measurement repeatability matter. Available as samples, volume production, and option-level customization (frequency/voltage/output/tuning/temperature grade).

Download Datasheet (PDF) Request RFQ / Contact Explore All Timing Devices

Key Features

Package: 25.4 × 22.1 × 11.0 mm SMD (metal case)
Output frequency: 10–40 MHz (5 MHz on request)
Output: HCMOS; VOH ≥ 2.4 V, VOL ≤ 0.4 V; CL 15 pF; duty 45–55% @ +1.4 V
Frequency stability: ±10 ppb over 0°C to +70°C (ref. +25°C)
Phase noise (20 MHz, typ.): −115 dBc/Hz @ 10 Hz; −130 dBc/Hz @ 100 Hz; −140 dBc/Hz @ 1 kHz; −150 dBc/Hz @ 10 kHz
Warm-up: ±10 ppm within 2 min @ +25°C (ref. 1 h)
Electrical tuning (VCO): typical ±0.5 ppm; 0–2.8 V control; positive slope; ~100 kΩ input
Power: start-up current up to 1000 mA; steady-state ~1.2 W @ +25°C
RoHS / REACH compliant

Typical figures for quick selection; for guaranteed values and conditions, please see the datasheet.

Key Specs

Test condition quick note: unless otherwise stated, typical measurements reference +25°C ambient, V_CC 3.3 V ±5%, and HCMOS load CL 15 pF. For full conditions and guaranteed limits, refer to the datasheet.

Stability ±10 ppb over 0°C to +70°C (ref. +25°C)

Phase noise (typ.) −115 dBc/Hz @10 Hz, −150 dBc/Hz @10 kHz (20 MHz)

Package 25.4×22.1×11.0 mm SMD metal case

Frequency range 10–40 MHz (5 MHz on request)

Supply 3.3 V ±5% (5.0 V optional)

Tuning (VCO) 0–2.8 V control, typical ±0.5 ppm range, positive slope

Detailed Specifications

Parameter	Value
Frequency Range	10 – 40 MHz (5 MHz on request)
Supply Voltage	3.3 V ±5% (5.0 V optional)
Output Waveform	HCMOS; CL 15 pF; duty 45–55% @ +1.4 V
Frequency Stability	±10 ppb over 0°C to +70°C (ref. +25°C)
Phase Noise @ 20 MHz (typ.)	−115 dBc/Hz @ 10 Hz; −130 dBc/Hz @ 100 Hz; −140 dBc/Hz @ 1 kHz; −150 dBc/Hz @ 10 kHz
Aging	±0.5 ppb/day (after 30 days); ±50 ppb/year; ±0.4 ppm/10 years
Warm-up	±10 ppm within 2 minutes @ +25°C (ref. 1 h)
Electrical Tuning (VCO)	Typical ±0.5 ppm; control 0–2.8 V; positive slope; input ≈100 kΩ
Power	Start-up current up to 1000 mA; steady-state ~1.2 W @ +25°C
Spurious	≥ 60 dBc (typ.)

Test Conditions & Interfaces

Measurement setup: V_CC = 3.3 V ±5% (unless otherwise noted), ambient +25°C, load 15 pF (HCMOS), low-inductance ground. Oscilloscope probe >= 500 MHz BW; spectrum analyzer phase-noise mode per datasheet guidance.
Power supply & filtering: Allow high inrush at start-up; size regulator for ≥1 A headroom. Use low-noise LDO plus LC/π filter close to the device; keep return path short and low-impedance.
Tuning control (V_CTRL): 0–2.8 V, positive slope; source impedance low and noise minimized (recommend RC filtering near the pin). Avoid digital coupling to the control line.
Grounding & shielding: Connect metal case to ground; maintain continuous ground under the device; avoid thermal-airflow directly impinging on the oven.
Warm-up characterization: Time to stability depends on ambient and airflow; for critical locks, profile your system with enclosure conditions.
Assembly notes: Follow recommended land pattern and reflow profile in datasheet; avoid mechanical stress to the metal can after reflow.

Applications

Why these specs matter: low close-in phase noise helps reduce timing jitter and improves clean carrier synthesis; tight stability helps holdover and frequency accuracy when the reference is interrupted.

SDH/SONET synchronization (stable holdover and low wander contribution)
PTP/SyncE timing for critical infrastructure (cleaner phase noise supports better packet timing stability)
Telecommunication base stations and routers (frequency reference for synchronization chains)
Frequency synthesizers (lower reference noise improves output purity)
Test and measurement instruments (repeatable readings and reduced spur sensitivity)
Military, aerospace & telecom timing references (high-stability reference blocks)
Digital switches and timing references

FOC-6S typical applications in SDH/SONET, base stations, precision instruments — Application example: telecom synchronization, base stations, and precision instrumentation.

Compare OCXO Models

Parameter	FOC-5S	FOC-5S-LN	FOC-6S
Package Size	14.7 × 9.6 × 8.2 mm	14.7 × 9.6 × 8.2 mm	25.4 × 22.1 × 11.0 mm
Output Frequency	10 – 40 MHz	10 – 40 MHz	10 – 40 MHz (5 MHz on request)
Output	HCMOS; duty 45–55% @ +1.65 V	HCMOS; duty 45–55% @ +1.65 V	HCMOS; duty 45–55% @ +1.4 V
Frequency Stability	±30 ppb over −40°C to +85°C	±10 ppb over −40°C to +85°C	±10 ppb over 0°C to +70°C
Phase Noise @ 20 MHz (typ., 10 kHz)	≈ −152 dBc/Hz	≈ −164 dBc/Hz	≈ −150 dBc/Hz
Warm-up	±0.1 ppm within 5 min @ +25°C	±0.1 ppm within 5 min @ +25°C	±10 ppm within 2 min @ +25°C
Power (steady-state)	~0.5–0.6 W @ +25°C	~0.5–0.6 W @ +25°C	~1.2 W @ +25°C
Datasheet	PDF	PDF	PDF

News & Guides

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Application Guides

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Ordering & Compliance

Ordering code example: FOC-6S – 20.000 MHz – 3V3 – ±10 ppb – 0~+70°C – HCMOS
MOQ & Lead time: Typical MOQ 100 pcs; samples available; standard lead time 3–4 weeks (subject to confirmation)
Compliance: RoHS/REACH compliant — request DoC via Contact
Country of Origin / HS code: CN / 854160
Packaging: Tray, ESD protected; standard pack qty 40 pcs/tray

Selection Path / Upgrade Options

If your system needs tighter temperature range, lower close-in phase noise, or smaller footprint, use the links below to select the best-fit OCXO family and application path.

OCXO Family for Telecom & Critical Infrastructure OCXO Family for Military, Aerospace & Telecom Timing Upgrade Option: FOC-5S-LN (smaller, ultra-low-noise) Alternative: FOC-5S (compact OCXO)

Documents & Downloads

Datasheet (PDF) Request Test Report / DoC

FOC-6S OCXO package outline (25.4×22.1 mm) mechanical drawing — Package outline for PCB footprint planning (FOC-6S OCXO).

Standards & External References

IEEE 1588-2019 (Precision Time Protocol) ITU-T G.8261 (Timing & Synchronization) NIST – Time & Frequency Division

Technical Support & Certifications

Need integration guidance (power filtering, tuning-line noise, grounding, warm-up profiling)? Our application engineering team supports design-in and validation. Reach us via Contact or email Fcom@fujicrystal.com.

ISO 9001 Certification ISO 14001 Certification

FAQ

Does FOC-6S support 5.0 V supply?

Yes, 5.0 V is optional; 3.3 V ±5% is standard.

What is the typical tuning sensitivity?

Approx. ±0.5 ppm total range with 0–2.8 V control; linearity and ppm/V available on request.

How long does warm-up take to reach final stability?

Typical ±10 ppm within 2 minutes at +25°C (ref. 1 h). Warm-up curves available in the datasheet; request extended curves if needed.

What is the typical MOQ and lead time?

Typical MOQ is 100 pcs. Standard production lead time is 3–4 weeks (subject to order confirmation).

Can I request samples and customization?

Yes. Samples are available for evaluation. Frequency, voltage, output, tuning range and temperature grade can be customized—contact us for an RFQ.

How is it packaged and can you provide test reports?

Standard packaging is ESD-protected tray (typ. 40 pcs/tray). Test reports, compliance documents (RoHS/REACH DoC), and additional screening options are available on request.

Do you publish pricing on the website?

No. This is a quote-only product. Pricing depends on frequency, options, screening level and volume—please contact us for a tailored quotation.

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