What are the differences between active and passive crystal oscillators?

Feb. 10, 2026

In the digital and intelligent transformation of modern society, crystal oscillators serve as the key to synchronizing electronic devices, primarily generating stable frequency signals. Traditionally, crystal oscillators are categorized into active and passive types, which differ significantly in functionality, applications, and characteristics. To help readers better distinguish between them, this article provides a detailed comparison of active and passive crystal oscillators.

1. Basic definition of active crystal oscillator and passive crystal oscillator.

An active crystal oscillator, as the name implies, is a crystal oscillator with an integrated power supply. It generates and provides the required electrical energy through its internal circuitry, eliminating the need for external power. The primary advantages of active crystal oscillators are their compact size and low power consumption. However, their drawbacks include the requirement for precise circuit matching to function properly and relatively high cost.

A passive crystal oscillator, also known as a crystal without built-in power supply, operates entirely through external power. Its key advantages include simple setup—just connect it with suitable capacitors and resistors—but it has drawbacks: requiring precise circuit matching for proper functioning, relatively large size, and higher power consumption.

2. The main difference between active crystal oscillator and passive crystal oscillator.

1. Power supply: Active crystals have built-in power, while passive crystals require external power.

2. Size and power consumption: Passive crystals require external power, resulting in larger dimensions and higher power consumption compared to active crystals.

3. Complexity of usage: Active crystal oscillators are relatively simple to use, requiring only the connection of appropriate capacitors and resistors. In contrast, passive crystal oscillators demand more complex matching circuits, otherwise they may fail to function properly.

4. Price: Passive crystals typically cost more than active crystals due to their need for additional power supply and complex matching circuits.

5. Performance: Generally, active crystal oscillators outperform passive ones in terms of accuracy, stability, and other performance metrics.

III. Summary

In summary, active and passive crystal oscillators each have their own advantages and disadvantages, and the choice of oscillator type depends on specific application requirements. For critical fields such as network communication, radar detection, precision measurement, and industrial control, Saisi offers a range of mid-to-high-end active crystal oscillators with ultra-low noise and ultra-high stability, available in standard or customized configurations. The product lineup includes both passive and active oscillators, featuring a maximum background phase noise of-188dBc/Hz, short-term stability of 1.08E-13/s, and temperature stability of-40 to 85°C with ≤1E-11.

Previous: How to prolong the service life of a temperature-compensated crystal oscillator

Next: The important role of atomic clock in industry

What is a PTP server? What are the functions and advantages of PTP servers? How should various industries choose PTP servers? Zhejiang Saisi Electronics is deeply involved in the field of time-frequency timing, providing high-performance PTP servers and professional time synchronization solutions, suitable for multiple scenarios such as communicati

Feb 10, 2026

Time synchronization security deployment plan for industrial control systems in the guidance of timing security protection

With the continuous improvement of intelligent networking of industrial control systems, various control devices, monitoring terminals, and automation systems in production sites are fully connected to the network, and precise time synchronization has become the foundation for stable operation of industrial production. At the same time, security ri

Feb 10, 2026

Time synchronization of rail transit: The Saisi mother clock system ensures the safety and punctuality of train operation

Zhejiang Saisi Electronics provides a time synchronization solution for rail transit, with a professional slave clock system adapted to urban rail transit scenarios, achieving unified timing of equipment throughout the line, and ensuring stable and on-time train operation.

Feb 10, 2026

What Special Advantages Do Atomic Clocks Have Over Crystal Oscillators?

Secondly, atomic clocks exhibit excellent stability. When crystal oscillators are subjected to external influences such as vibration and electromagnetic interference, their oscillation frequency is prone to changes, thereby affecting the accuracy of time measurement. Thanks to their working principle, atomic clocks have a high resistance to such ex

Feb 10, 2026

Data center time synchronization: Saisi time-frequency equipment ensures data consistency and traceability

Zhejiang Saisi Electronics provides data center time synchronization solutions, relying on high-quality time-frequency equipment, NTP servers, and PTP servers to ensure data consistency and traceability, and adapt to the needs of multi-scale data centers.

Feb 10, 2026

The application advantages of NTP time servers in the financial field

In the field of financial transactions, highly accurate NTP time servers are particularly important. If different trading systems are not synchronized in time, it may lead to trading errors and huge losses. In high-frequency trading, the accuracy of time synchronization is even more necessary. Because high-frequency trading is conducted in units of

Feb 10, 2026

The Specific Application of Electronic Clock System in School Examination Room and Its Advantages

In modern education systems, the fairness, impartiality, and effectiveness of examinations are crucial elements. To ensure these principles are upheld, many schools have begun adopting advanced technological solutions, including electronic clock systems. This article will explore the specific applications and advantages of electronic clock systems

Feb 10, 2026

What is a voice chip? Functions and Applications of Voice Chips

Zhejiang Saisi Electronics provides a detailed explanation of what a voice chip is, offering high stability, low-power voice chips that cover voice storage, recognition, and interaction functions, and are suitable for various industry scenarios such as smart homes, healthcare, and automotive electronics.

Feb 10, 2026

Working Principle of Crystal Oscillators

In electronic devices, crystal oscillators are crucial components that serve to stabilize frequencies in circuits. They are widely used in electronic systems such as microcontrollers, communication equipment, audio amplifiers, and timer modules, acting as key parts to ensure the stable operation of devices.

Feb 10, 2026

What causes the significant price variations in time servers?

With the rapid advancement of information technology, time servers have become indispensable in data centers, industrial control systems, and financial transaction systems. Yet, when confronted with time servers from various brands on the market, users often notice significant price variations. What drives these differences? This article examines t

Feb 10, 2026