1.5KE39A

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TVS - Diodes play an important role in providing surge-protection within the field of electronics. The 1.5KE39A is a unidirectional device used in a variety of applications, providing robust protection against electrostatic discharge (ESD).

1.5KE39A is the next generation of transil devices from STMicroelectronics. This device has a low capacitance and low series inductance which allow for better system protection against ESD. The 1.5KE39A can handle up to 27.5A with a very low clamping voltage of 37.5V. It also offers excellent radiation hardness, enabling it to be used in high-reliability, high-radiation applications such as space and avionics.

1.5KE39A can be reliably used in automotive and consumer applications, as well as other fields that require protection from transients, such as telecom, industrial, and medical. It is also suitable for controlling high-energy ESD in wired communication equipment and other equipment that use high-frequency signals.

The 1.5KE39A is based on the same proven design as the STMicroelectronics\' classic 1.5KE series, which provides hard, ultra-fast ESD protection. It works by clamping the surge voltage along the positive supply rail to a voltage that is determined by zener breakdown. A buried zener diode structure helps prevent it from suffering from excessive junction capacitance, which can lead to significant voltage overshoot.

The 1.5KE39A has a low on-resistance of 5 Ω, making it very efficient at dissipating surge energy. This low resistance also allows it to be used in applications that require low dynamic resistance, such as battery monitoring systems. The device has an operating temperature range of -55°C to 125°C.

The 1.5KE39A also has a minimal junction capacitance of 0.35pF, reducing signal-loss that can occur from circuit-level parasitic capacitances. This makes it a viable option for infrared and other high-speed signal applications. It also has an IEC 61000-4-2 level-4 ESD rating, which makes it great for applications that are exposed to ESD.

In summary, the 1.5KE39A from STMicroelectronics is a robust and reliable device for providing surge protection in a variety of applications. Its low series inductance and low capacitance allow it to provide efficient ESD protection at high-speed. Its low dynamic resistance makes it well-suited for battery management systems. And its IEC 61000-4-2 level-4 rating makes it suitable for applications that require protection from electrostatic discharge.

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