SMD3225-16MHz-12pF
Compact SMD 3.2x2.5mm 16MHz crystal resonator with 12pF load capacitance for space-constrained applications.
Product Overview
Description
This 16MHz crystal in a compact 3.2x2.5mm SMD package is ideal for space-constrained applications such as wearable devices, IoT sensors, and portable electronics.
The 12pF load capacitance is compatible with modern low-power MCUs. The 4-pad package provides excellent mechanical stability and reliable solder joints.
With ±20ppm frequency tolerance and industrial temperature range, this crystal delivers reliable performance in demanding environments while saving valuable PCB space.
Product Series
SMD
Primary Application
Wearable devices
Key Features
- 16MHz frequency
- Compact 3.2x2.5mm
- ±20ppm tolerance
- 4-pad SMD
Specifications
| Frequency | 16.000 MHz |
|---|---|
| Frequency Tolerance | ±20ppm at 25C |
| Frequency Stability | ±30ppm over -40C to +85C |
| Load Capacitance | 12pF |
| Equivalent Series Resistance | 80 ohms max |
| Drive Level | 100uW max |
| Aging | ±3ppm per year max |
| Operating Temperature | -40C to +85C |
| Package | SMD 3.2 x 2.5 x 0.7mm |
Applications
Wearable devices
Electronic system design
IoT sensors
Sensor signal conditioning
Portable electronics
Electronic system design
Compact PCBs
Electronic system design
FAE Expert Insights
"The SMD3225-16MHz-12pF is my go-to recommendation for compact designs requiring 16MHz clock. I have successfully used this crystal in numerous IoT and wearable projects. The 3.2x2.5mm package offers an excellent balance between size and performance - smaller than 5.0x3.2mm but more stable than 2.5x2.0mm. The 12pF load capacitance works well with modern low-power MCUs like nRF52 series. I particularly appreciate the ±20ppm tolerance which provides good accuracy for BLE and USB applications. The 4-pad package with grounded outer pads provides excellent mechanical stability. For cost-sensitive compact designs, this crystal offers great value. I recommend using 18pF load capacitors with this crystal for optimal frequency accuracy."
Compact SMD crystal with excellent size-performance balance for IoT applications
— Sarah Johnson, BeiLuo
Frequently Asked Questions
What are the recommended load capacitors for this 12pF crystal?
For the 12pF load capacitance: CL = (C1 * C2) / (C1 + C2) + Cstray. With Cstray = 3-5pF (typical for compact SMD layouts), you need effective capacitance of 7-9pF. Using C1 = C2, each capacitor should be 14-18pF. I recommend 18pF NP0/C0G ceramic capacitors in 0402 or 0603 package. The smaller 0402 package is suitable for compact designs but has slightly higher stray capacitance. Place capacitors as close as possible to the MCU crystal pins. Use ground vias near the capacitors for good grounding. Always verify actual frequency and adjust capacitors if needed.
Use 18pF NP0 capacitors. Contact us for PCB layout recommendations.
Is this crystal suitable for BLE applications?
Yes, this 16MHz crystal is excellent for BLE applications. Nordic nRF52 series and similar BLE SoCs typically use 16MHz or 32MHz crystals. The ±20ppm tolerance meets BLE requirements which typically need ±50ppm or better. The 16MHz frequency allows the MCU PLL to generate the required 48MHz for USB (if supported) and 2.4GHz radio clock. The compact 3.2x2.5mm package is ideal for small BLE devices. The industrial temperature range supports outdoor BLE applications. I have used this crystal in multiple BLE beacon and sensor projects with reliable results. Ensure your BLE SoC supports 16MHz crystal input.
Verify your BLE SoC supports 16MHz crystal. Contact us for BLE crystal recommendations.
What is the advantage of 4-pad SMD crystals over 2-pad?
4-pad SMD crystals have two active pads (crystal connections) and two grounded pads (mechanical anchors). Advantages: 1) Better mechanical stability - grounded pads anchor the crystal to PCB, reducing vibration sensitivity. 2) Improved EMI performance - grounded pads provide shielding. 3) More reliable soldering - larger pads with better solder joint strength. 4) Consistent performance - reduced variation due to mechanical stress. The 2.0x1.6mm and smaller packages are typically 4-pad for mechanical reasons. 3.2x2.5mm and larger may be available in 2-pad or 4-pad. For high-vibration applications, 4-pad is recommended. This crystal uses 4-pad configuration for optimal reliability.
Use 4-pad crystals for high-reliability and vibration-resistant applications.
Can this crystal be hand-soldered or is reflow required?
This SMD 3.2x2.5mm crystal can be hand-soldered with care, but reflow soldering is recommended for best results. Hand soldering considerations: 1) Use fine-tip soldering iron at 300-350C. 2) Minimize heating time to prevent crystal damage. 3) Pre-heat the PCB if possible. 4) Use flux for better wetting. Reflow advantages: 1) Consistent solder joints. 2) Controlled temperature profile. 3) Better for production. 4) Reduced thermal shock. For prototyping, hand soldering is acceptable. For production, reflow is strongly recommended. The ceramic package is more sensitive to thermal shock than metal can HC-49/S. Follow ESD precautions when handling.
Use reflow for production. Hand soldering acceptable for prototyping with care.
What is the maximum height clearance needed for this crystal?
The SMD3225-16MHz-12pF has a maximum height of 0.7mm. Recommended clearance: Minimum 0.3mm above the crystal for airflow and to prevent contact with enclosures or other components. Total recommended clearance: 1.0mm above PCB surface. This low profile makes the crystal suitable for slim devices and applications with height constraints. The 0.7mm height is standard for 3.2x2.5mm ceramic package crystals. If your application has severe height constraints, consider the ultra-thin version (0.55mm max) available on request. For most applications, the standard 0.7mm height provides good reliability and manufacturability.
Allow 1.0mm total height clearance. Contact us for ultra-thin options if needed.