3225-25MHz-12pF
Compact 3225 SMD crystal resonator, 25MHz frequency, 12pF load capacitance, ±20ppm tolerance, ideal for high-speed mi...
Product Overview
Description
The 3225-25MHz-12pF is a compact surface-mount crystal resonator in the popular 3.2mm x 2.5mm package. It provides a stable 25MHz frequency reference with ±20ppm tolerance, suitable for high-speed microcontrollers, Ethernet applications, and communication interfaces.
This crystal features 12pF load capacitance, optimized for modern high-speed MCUs and SoCs. The 3225 package offers excellent balance between size and performance, making it ideal for space-constrained designs while maintaining good ESR characteristics.
With industrial temperature range of -40°C to +85°C and reliable ceramic package construction, this crystal is widely used in networking equipment, industrial control, and consumer electronics requiring higher clock frequencies.
Product Series
Crystal Resonators
Primary Application
High-speed microcontroller clock
Key Features
- Compact 3225 SMD package for space-constrained designs
- 25MHz frequency for high-speed applications
- 12pF load capacitance for modern MCUs
- Industrial temperature range -40°C to +85°C
- Low ESR for reliable oscillation
- ±20ppm tolerance for communication applications
- Ceramic package for excellent reliability
- RoHS compliant and Pb-free
Specifications
| Frequency | 25.000 MHz |
|---|---|
| Tolerance | ±20 ppm |
| Load Capacitance | 12 pF |
| ESR | ≤80 Ω |
| Drive Level | 10-100 μW |
| Temperature Range | -40°C to +85°C |
| Aging | ±3 ppm/year |
| Package | 3225 (3.2mm x 2.5mm) SMD |
Applications
High-speed microcontroller clock
Industrial automation and control
Ethernet PHY clock
Communication and interface
USB interface timing
Communication and interface
WiFi/Bluetooth modules
Electronic system design
Industrial communication
Industrial automation and control
FPGA clock source
Electronic system design
FAE Expert Insights
"The 3225-25MHz-12pF is my recommendation for Ethernet and high-speed MCU applications. The 3225 package is the sweet spot - small enough for compact designs but large enough for good ESR and easy handling. I have used this crystal extensively in Ethernet PHY clock applications with excellent results. The 12pF load capacitance works well with most modern ARM Cortex-M4/M7 MCUs and Ethernet PHYs. For 25MHz Ethernet RMII clock, the ±20ppm tolerance provides adequate accuracy. PCB layout is critical at 25MHz - keep traces short and symmetric. I recommend 15pF load capacitors for typical 3-4pF stray capacitance. This crystal is also popular for WiFi modules requiring 25MHz or 26MHz reference."
Excellent 25MHz crystal for Ethernet and high-speed MCU applications in compact SMD package
— David Liu, BeiLuo
Frequently Asked Questions
What load capacitors should I use with this 12pF CL crystal?
For 3225-25MHz-12pF with CL=12pF, use two 15pF ceramic capacitors. The calculation: C1 = C2 = 2 × (CL - Cstray). With typical Cstray = 3-4pF: C1 = C2 = 2 × (12 - 3.5) = 17pF. Use standard 15pF or 18pF values. At 25MHz, proper load capacitance is critical for stable oscillation. Use C0G/NP0 ceramic capacitors with tight tolerance (±5% or better). Place capacitors close to crystal pins with short traces. Verify actual frequency with frequency counter and adjust if measured frequency deviates significantly from 25MHz.
Start with 15pF capacitors for 12pF CL crystal. Verify frequency and adjust if needed.
Is this crystal suitable for Ethernet applications?
Yes, 3225-25MHz-12pF is excellent for 10/100 Ethernet PHY clock applications. Most Ethernet PHYs like DP83848, KSZ8081, and LAN8720 use 25MHz crystal reference. The ±20ppm tolerance provides adequate accuracy for Ethernet communication. The 3225 package is widely used in Ethernet designs. Ensure your PHY datasheet specifies 25MHz crystal compatibility. Some PHYs require specific load capacitance - verify CL matches your PHY requirements (12pF is common). For Gigabit Ethernet, check if 25MHz is the correct frequency - some Gigabit PHYs use different frequencies. Layout is critical - place crystal close to PHY with short traces.
Verify your Ethernet PHY datasheet for 25MHz crystal compatibility. This crystal is suitable for most 10/100 Ethernet applications.
What is the advantage of 3225 package over smaller sizes?
The 3225 (3.2mm x 2.5mm) package offers several advantages over smaller packages: (1) Lower ESR - typically 60-80Ω vs 100-150Ω for 2520/2016; (2) Easier handling - larger size is easier to place and inspect; (3) Better availability - 3225 is the most popular size with best stock; (4) Cost-effective - good balance of size and price; (5) Reliable soldering - larger pads are more forgiving; (6) Good frequency range - supports 8MHz to 50MHz well. Smaller packages (2520, 2016, 1612) are better for space-constrained wearables but have higher ESR and may be harder to source. 3225 is the sweet spot for most applications.
Choose 3225 for best balance of performance and size. Use smaller packages only when space is critical.
Can I use this crystal with 3.3V or 5V MCUs?
Yes, 3225-25MHz-12pF works with both 3.3V and 5V MCUs. The crystal itself is a passive component and doesn't have voltage rating. The MCU's internal oscillator inverter operates at the MCU's supply voltage. Most modern MCUs have oscillator circuits that work across 1.8V to 5.5V. Key considerations: (1) Ensure your MCU supports 25MHz at its operating voltage; (2) Check MCU datasheet for recommended crystal specifications; (3) Verify load capacitance matches MCU recommendations; (4) Some 5V MCUs may have different drive levels - verify crystal drive level is within specification. XGHC crystals work reliably with both 3.3V and 5V systems when properly designed.
This crystal works with both 3.3V and 5V systems. Verify your MCU supports 25MHz operation.
What PCB layout recommendations apply to this crystal?
PCB layout recommendations for 3225 crystal: (1) Place crystal as close as possible to MCU crystal pins - minimize trace length; (2) Keep traces symmetric - equal length and width between crystal and MCU; (3) Use ground plane under crystal - provides isolation and reduces noise; (4) Keep high-speed signals away - avoid routing switching signals near crystal traces; (5) Place load capacitors close to crystal - minimize trace length; (6) Use guard ring if needed - for noisy environments; (7) Avoid vias on crystal traces - keep traces on single layer if possible; (8) Keep loop area small - minimize EMI pickup. At 25MHz, layout is more critical than at lower frequencies. Follow these guidelines for reliable oscillation.
Follow PCB layout best practices. Keep traces short and symmetric. Contact FAE for layout review.