SMAJ170A

The SMAJ170A is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed to protect sensitive electronic components from voltage spikes and transients. This device is particularly useful in applications where overvoltage protection is critical, such as in automotive, telecommunications, and consumer electronics.

Key Features:

1. Voltage Rating: The SMAJ170A has a breakdown voltage of approximately 170 volts, making it suitable for clamping high-voltage transients while allowing normal operating voltages to pass through without interference.

2. Power Dissipation: The device can handle a peak power dissipation of up to 400 watts, which allows it to absorb significant energy from transient events without failing.

3. Package Type: The SMAJ170A is housed in a DO-214AA (SMA) package, which is a surface-mount device (SMD) that provides a compact footprint for easy integration into circuit boards. The package is designed for efficient thermal management, ensuring that the diode can operate effectively even under high-stress conditions.

4. Response Time: The SMAJ170A features a fast response time, typically in the nanosecond range, which is crucial for protecting sensitive components from fast transients.

5. Clamping Voltage: The clamping voltage is specified at a certain peak pulse current, ensuring that the device will limit the voltage to a safe level during transient events.

6. Operating Temperature Range: The device is rated for a wide operating temperature range, typically from -55°C to +150°C, making it suitable for use in various environmental conditions.

7. Applications: Common applications for the SMAJ170A include ESD protection, surge protection in power supplies, and safeguarding sensitive components in automotive electronics, communication lines, and industrial equipment.

8. Compliance and Standards: The SMAJ170A is compliant with various industry standards, ensuring reliability and performance in critical applications.

Electrical Characteristics:

• Reverse Stand-off Voltage (V_R): 170V
• Breakdown Voltage (V_BR): Typically around 188V
• Clamping Voltage (V_C): Specified at a given peak pulse current
• Peak Pulse Power (P_PP): 400W (for 1ms pulse duration)
• Capacitance: Low capacitance values, ensuring minimal impact on signal integrity in high-speed applications.

Conclusion:

The SMAJ170A from Littelfuse Inc. is a robust and reliable transient voltage suppressor diode that provides essential protection for electronic circuits against voltage spikes. Its combination of high power handling, fast response time, and wide operating temperature range makes it an ideal choice for a variety of applications where overvoltage protection is necessary.