Crystal Oscillator 4MHz

The Crystal Oscillator 4MHz is a 4 MHz quartz crystal used as a stable, accurate clock source for microcontrollers and digital circuits. Connected to the oscillator pins of a microcontroller with two small load capacitors, it sets the clock frequency far more precisely than an internal RC oscillator. The 4 MHz value is a classic choice for PIC microcontrollers, where it gives a 1 µs instruction cycle.

Crystal Oscillator 4MHz Specifications

• Frequency: 4 MHz
• Type: quartz crystal, two-terminal (passive), driven by the microcontroller's oscillator circuit
• Load capacitors: typically 15–33 pF, commonly 22 pF, one from each pin to GND
• Polarity: none, can be fitted either way round

Crystal Oscillator 4MHz Applications

• Clock for PIC16F84A, PIC16F628A and PIC16F877A microcontrollers in XT mode
• 8051 and AVR microcontroller boards
• Accurate timing for clocks, timers and counters
• Digital electronics and microcontroller labs

What's in the Box

• 1 × 4 MHz crystal

Tip: Connect the crystal between the OSC1 and OSC2 (or XTAL1 and XTAL2) pins, with a 22 pF ceramic capacitor from each pin to GND, and keep the leads short. On a PIC, select the XT oscillator mode in the configuration bits when using 4 MHz.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.