Technical Support

You can verify LiTong's authorized distributor status through multiple channels: (1) XGHC official website - check the distributor list on XGHC's official website; (2) Authorization certificate - LiTong can provide official authorization documents from XGHC; (3) Direct verification - contact XGHC directly to confirm LiTong's distributor status; (4) Product authenticity - all LiTong-supplied XGHC products have genuine traceability. As an authorized distributor, LiTong provides full warranty support, technical assistance, and access to XGHC's engineering resources.

Purchase from LiTong with confidence knowing you are getting genuine XGHC products with full support.

Requesting a quote from LiTong is straightforward: (1) Contact information - email sales@litong.com or call our sales hotline; (2) Product details - provide XGHC part numbers, quantities, and any special requirements; (3) Application information - share your application type for appropriate product recommendations; (4) Timeline - indicate your project timeline and any forecasted volumes; (5) Response time - quotes typically provided within 24-48 hours for standard products; (6) Volume pricing - tiered pricing available for volume orders. For complex projects, our FAE team can provide technical consultation alongside the quote.

Contact LiTong sales with your requirements for competitive pricing and technical support.

LiTong provides comprehensive technical support for XGHC crystal products through multiple channels: (1) Phone support - call our technical support hotline during business hours; (2) Email support - send technical questions to fae@litong.com; (3) Online resources - access datasheets, application notes, and FAQs on our website; (4) On-site support - available for major customers and complex projects; (5) Design review - our FAE team can review your crystal oscillator implementation; (6) Failure analysis - support for any quality issues or returns. Response times vary by priority: critical issues within 4 hours, standard questions within 24 hours.

Contact LiTong FAE team for prompt technical support on XGHC crystal products.

LiTong's RMA process for XGHC crystal products: (1) Contact - reach out to support@litong.com with product details and failure description; (2) Troubleshooting - our FAE team will help diagnose the issue remotely; (3) RMA number - if confirmed defective, an RMA number will be issued; (4) Return - ship the defective product to LiTong with RMA number clearly marked; (5) Analysis - XGHC engineering team analyzes the failure; (6) Replacement - replacement shipped within 3-5 business days after receipt. Standard warranty periods: Crystal resonators 2 years, Crystal oscillators 2 years. Note: Physical damage and misuse are not covered under warranty.

Contact LiTong support for RMA assistance. We aim to minimize downtime with fast turnaround.

Load capacitance (CL) calculation is critical for proper crystal oscillation. The formula is: CL = (C1 × C2) / (C1 + C2) + Cstray, where C1 and C2 are the external load capacitors, and Cstray is the stray capacitance from PCB traces and IC pins (typically 3-5pF). For example, if your crystal requires 12pF load capacitance and Cstray is 4pF, you need (C1 × C2) / (C1 + C2) = 8pF. Using C1 = C2 = 16pF gives approximately 8pF plus stray capacitance. Contact LiTong FAE for detailed calculation support and our load capacitance calculator tool.

Use the load capacitance formula and consult FAE for verification. Proper CL ensures accurate frequency.

Crystal resonators (quartz crystals) are passive components that require external oscillator circuitry to generate a clock signal. They provide high Q factor and excellent frequency stability at low cost. Crystal oscillators (XO, TCXO, VCXO, OCXO) are active components with built-in oscillator circuitry that provide a direct clock output. Oscillators are easier to use (no external circuit design needed) and offer better performance (especially TCXO/OCXO for temperature stability), but at higher cost and power consumption. Choose resonators for cost-sensitive designs with available oscillator circuitry; choose oscillators for ease of use and superior performance.

Choose resonators for cost-sensitive designs; choose oscillators for ease of use and better performance.

Key parameters for selecting a crystal oscillator include: (1) Frequency - the operating frequency required by your system; (2) Frequency stability - ppm tolerance over temperature and time; (3) Supply voltage - must match your system voltage (1.8V, 2.5V, 3.3V, 5V); (4) Output type - CMOS, LVCMOS, LVDS, HCMOS, or clipped sine wave; (5) Operating temperature range - commercial (0°C to +70°C), industrial (-40°C to +85°C), or automotive (-40°C to +125°C); (6) Package size - HC-49/S through-hole or SMD packages (3225, 2520, 2016, 1612); (7) Phase noise/jitter - critical for high-speed communication applications. Contact LiTong FAE for selection assistance.

Consider frequency, stability, voltage, output type, temperature range, package, and phase noise requirements.

Crystal oscillator startup issues can be caused by several factors: (1) Load capacitance mismatch - verify C1/C2 values match crystal CL specification; (2) Excessive ESR - check crystal ESR is within MCU/oscillator IC specifications; (3) Insufficient drive level - ensure oscillator circuit provides adequate drive power; (4) PCB layout issues - check for long traces, inadequate ground plane, or noise coupling; (5) Crystal damage - test crystal on evaluation board to rule out damage; (6) Temperature extremes - verify operation across full temperature range. Use oscilloscope to check for oscillation signal and measure frequency accuracy. Contact LiTong FAE for systematic troubleshooting support.

Check load capacitance, ESR, drive level, PCB layout, and crystal condition systematically.

Frequency stability refers to how much the crystal frequency varies from the nominal value under different conditions. It's typically specified in parts per million (ppm) and includes: (1) Initial tolerance - variation at 25°C after manufacturing; (2) Temperature stability - variation across operating temperature range; (3) Aging - long-term drift over years of operation; (4) Load stability - variation with load capacitance changes. Frequency stability is critical for: communication systems (ensuring proper data rates), timing applications (accurate timekeeping), and synchronous systems (preventing data errors). Standard crystals offer ±20-50ppm, TCXO offers ±0.5-2.5ppm, and OCXO offers ±0.01-0.1ppm stability.

Choose stability based on application requirements. Use TCXO for high stability needs.

Yes, XGHC offers AEC-Q200 qualified automotive-grade crystals specifically designed for automotive electronics. These crystals meet stringent automotive requirements including: extended temperature range (-40°C to +125°C or +150°C), enhanced shock and vibration resistance (5000g/0.3ms shock, 20g RMS vibration), tight frequency stability (±20ppm), and long-term reliability. Automotive applications include engine control units (ECU), ADAS systems, infotainment systems, body electronics, and transmission control. XGHC provides complete PPAP documentation for automotive approval. Contact LiTong for automotive crystal selection and PPAP support.

Use AEC-Q200 qualified crystals for automotive. Contact LiTong for PPAP documentation.

XGHC offers a comprehensive range of crystal packages to meet various application requirements: (1) HC-49/S - traditional through-hole package for prototyping and industrial applications; (2) HC-49/S SMD - surface-mount version of HC-49/S; (3) 3225 (3.2×2.5mm) - popular SMD package for general applications; (4) 2520 (2.5×2.0mm) - compact SMD for space-constrained designs; (5) 2016 (2.0×1.6mm) - ultra-compact for portable devices; (6) 1612 (1.6×1.2mm) - miniature package for wearables and IoT. Package selection depends on available PCB space, manufacturing process, and cost considerations. Contact LiTong for package recommendations based on your specific requirements.

Select package based on PCB space, manufacturing process, and application requirements.

Proper PCB layout is critical for reliable crystal oscillator operation. Key guidelines include: (1) Keep traces short - minimize crystal-to-MCU trace length to reduce stray capacitance; (2) Symmetric layout - keep C1 and C2 traces equal length and symmetric; (3) Ground plane - use solid ground plane under crystal and load capacitors; (4) Guard ring - consider guard ring around crystal for noisy environments; (5) Keep away from noise - route crystal traces away from high-speed signals, switching power supplies, and antennas; (6) No vias on crystal traces - avoid vias between crystal and MCU if possible; (7) Load capacitor placement - place C1/C2 close to crystal pads. Contact LiTong FAE for layout review and recommendations.

Follow PCB layout guidelines carefully. Short traces, symmetric layout, and good grounding are essential.