7.3728 MHz HC-49 quartz crystal Oscillator

7.3728 MHz Quartz Crystal – HC‑49 Package, High Accuracy Frequency Component

The 7.3728 MHz quartz crystal is designed to provide precise and stable frequency reference for microcontrollers, UART communication, and timing applications. With a tight frequency tolerance of ±20 ppm and typical load capacitance around 18 pF, this crystal maintains excellent stability over temperature ranges from –40 °C to +85 °C. The HC‑49 through‑hole package offers a compact and reliable mounting solution via radial leads, making it suitable for PCB integration in industrial and telecommunications equipment.

This frequency (7.3728 MHz) is commonly used in embedded systems to derive precise UART baud rates such as 115200 bps, and it enables exact integer division to standard timing intervals while minimizing jitter. Typical series resistance (ESR) is around 60 Ω, with load capacitance from 18 pF to 20 pF depending on package and manufacturer.

The quartz crystal is constructed using a high-quality quartz wafer sealed inside a metal or glass‑to‑leads HC‑49 enclosure. Proper PCB layout—placing the crystal close to the oscillator circuit, providing tight routing and associated capacitors—ensures minimal interference and optimal signal integrity. This makes the 7.3728 MHz crystal ideal for oscillator designs and embedded timing applications.

Key Specs – 7.3728 MHz Quartz Crystal Frequency: 7.3728 MHz Tolerance: ±20 ppm typical (as tight as ±10 ppm in select variants) Load Capacitance: ~18 pF to 20 pF Series Resistance (ESR): ~60 Ω (typical) Operating Temperature: –40 °C to +85 °C (some industrial grade up to +125 °C) Package: HC‑49/U or HC‑49‑US through-hole enclosure Mounting: Radial leads, PCB through-hole Applications: UART clocks (e.g. 115200 bps), microcontroller timing, precision oscillators, communication systems