10 Questions You Should Know about the HC-49 SSH Jacket Quartz Crystal

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The HC-49 SSH jacket quartz crystal is an essential component in many electronic devices. Understanding its specifications, applications, and characteristics can significantly aid engineers and hobbyists alike. Here are ten critical questions you should know about the HC-49 SSH jacket quartz crystal.

1. What is an HC-49 SSH Jacket Quartz Crystal?

The HC-49 SSH jacket quartz crystal is a type of piezoelectric crystal commonly used in oscillators to generate precise frequencies. The "HC" stands for "hermetically sealed crystal," which means it is enclosed in a metal casing to protect against environmental factors.

2. What are the Key Specifications of the HC-49 SSH Crystal?

The key specifications of the HC-49 SSH crystal include:

• Frequency Range: Typically between 1 MHz and 80 MHz.
• Load Capacitance: Standard values include 18 pF, 20 pF, and 30 pF.
• Operating Temperature: Commonly -40°C to +85°C.
• Drive Level: Up to 500 μW.

3. What are the Applications of HC-49 SSH Crystals?

HC-49 SSH crystals are widely used in various applications, including:

• Wireless communication systems
• Microcontroller circuits
• Clock generation in computers
• Radio transmitters and receivers

4. How Do You Choose the Right HC-49 SSH Crystal?

When selecting an HC-49 SSH crystal, consider the following factors:

• Frequency Requirement
• Load Capacitance
• Temperature Range
• Packaging Type

5. What is the Frequency Tolerance of HC-49 SSH Crystals?

Frequency tolerance can vary, but it typically ranges from ±20 ppm to ±100 ppm. This means that the actual frequency output may vary slightly from the specified value.

6. How is the HC-49 SSH Crystal Constructed?

The construction of the HC-49 SSH crystal involves:

• A quartz blank cut to specific dimensions to determine frequency.
• A metal can that provides protection and seals the crystal.
• Leads for mounting on a circuit board, usually tinned for easy soldering.

7. What are the Advantages of Using HC-49 SSH Crystals?

Some advantages include:

• High stability and accuracy
• Resistance to environmental factors
• Cost-effectiveness for mass production

8. What is the Lifespan of an HC-49 SSH Crystal?

The operational lifespan of the HC-49 SSH crystal is generally very high, often exceeding 10 years under normal operating conditions. Factors such as extreme temperature and electrical overdrive can affect longevity.

9. How to Test an HC-49 SSH Crystal?

Testing can be performed using an LCR meter or an oscilloscope. Key parameters to measure include:

• Resonant frequency
• Load capacitance
• Insertion loss

10. Where Can You Purchase HC-49 SSH Crystals?

HC-49 SSH crystals can be found at various electronic component distributors, such as Digi-Key, Mouser Electronics, and Newark. It is advisable to purchase from reputable suppliers to ensure quality.

In conclusion, understanding the HC-49 SSH jacket quartz crystal and its specifications helps in making informed decisions during design and implementation. From frequency tolerance to lifespan, these components play a crucial role in modern electronics.

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