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Small silver HC49/US crystal with two blue capacitors attached, breadboard friendly

Adafruit

Adafruit 12 MHz crystal with 20pF capacitors, HC49/US package

SKU CH-J29V-TXBD0

A 12 MHz crystal with two 20pF capacitors in an HC49/US package, 30PPM tolerance and 50PPM stability for precise USB timing or time-keeping

  • TypePrototyping Products
  • Precise timing for USB and RF with 30PPM tolerance and 50PPM stability
  • Breadboard-friendly HC49/US short-style package simplifies prototyping
  • Two 20pF capacitors included for immediate oscillator setup
  • Symmetrical pinout allows flexible XTAL-in and XTAL-out connection
  • Capacitor leads measure 13mm length and 5mm diameter for standard spacing

12 MHz crystal with 20 pF capacitors

This 12.000 MHz crystal ships in an HC49/US short style package with two 20pF capacitors included. The component offers 30PPM tolerance and 50PPM stability for precise timing. It suits microcontroller projects that require an external clock source for USB timing or long-term time-keeping. Breadboard friendly pin spacing makes prototyping straightforward.

Check pin spacing and load capacitance

Verify that your microcontroller or oscillator circuit specifies a 12 MHz fundamental crystal with 20 pF load capacitance. Confirm the HC49/US footprint matches your board layout and that 13 mm pin length on the capacitors fits your enclosure. Ensure you can provide the ground connections for each capacitor and any series resistor the datasheet recommends.

Upgrades loose ceramic resonators

Replaces ceramic resonators when tighter frequency stability is needed for reliable USB enumeration or accurate real-time clocks. The jump is worth it when 30PPM tolerance prevents communication errors or drift over temperature. Not for designs that need a different frequency, surface-mount packaging, or integrated oscillator circuitry.

Highlights

  • Precise timing for USB and RF with 30PPM tolerance and 50PPM stability
  • Breadboard-friendly HC49/US short-style package simplifies prototyping
  • Two 20pF capacitors included for immediate oscillator setup
  • Symmetrical pinout allows flexible XTAL-in and XTAL-out connection
  • Capacitor leads measure 13mm length and 5mm diameter for standard spacing

Specifications

TypePrototyping Products

Questions about this item

What does the package include and is anything else required to use the crystal?

The package includes one 12.000 MHz HC49/US crystal and two 20pF capacitors with 13mm pin length and 5mm diameter. Check your microcontroller datasheet to see if a 1 Megaohm resistor or other components are also needed.

Should I choose this 12 MHz crystal or a different frequency for USB timing?

This 12.000 MHz model is specified as good for USB timing, long-term time-keeping and RF/PLL/VCO driving with 30PPM tolerance and 50PPM stability. Select the frequency that matches your microcontroller or application requirements.

What does the 30PPM tolerance and 50PPM stability mean for real-world timing accuracy?

At 12.000 MHz the 30PPM tolerance and 50PPM stability provide high precision suitable for USB timing, long-term time-keeping and RF/PLL/VCO driving. The HC49/US package is breadboard friendly for easy prototyping.

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