SMF5V0A-HM3-18 Circuit Protection

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Transient Voltage Suppressors (TVS) are used to protect sensitive circuits from high voltages caused by electrical transients. The SMF5V0A-HM3-18 is a series of TVS diodes specifically designed for clamping overvoltage in automotive applications. The components provide level shifting and device matching capabilities while minimizing capacitive loading.

The SMF5V0A-HM3-18 is a low-cost, low-power, low-leakage TVS diode designed to protect sensitive components from voltage transients caused by electrostatic discharge (ESD). The diode is able to suppress ESD pulses up to 30kV contact and 15kV air discharge, providing twice the immunity rating of standard automotive TVS diodes.

The device consists of two PNPN structures, connected back-to-back to form what is known as a bidiode. The combination of these two devices creates a diode that is able to conduct in either direction, allowing it to protect against either positive or negative voltage transients. The diode has a forward voltage drop of typically 1.5 V, with a maximum leakage current of 40 μA. It is available in a SOT-23-3 package, which is ideal for applications with limited space and board space.

The diode features two distinct modes of operation. The first mode is the breakdown or clamping mode. This mode operates by limiting the voltage of the transient to a safe level by clamping the voltage to the breakdown voltage of the diode. In this mode, the diode absorbs the brunt of the transient energy. The second mode is the steering mode, which operates in conjunction with the breakdown mode. This mode allows the TVS diode to turn the transient energy away from sensitive components, minimizing damage and allowing the diode to dissipate the energy without overstressing the device.

The SMF5V0A-HM3-18 is an ideal choice for automotive applications requiring ESD protection. The device offers a low-cost solution with a high level of immunity, small size and low power requirements. The dual modes of operation make the device suitable for a variety of automotive applications, providing a reliable and cost-effective way to protect sensitive components from voltage transients.

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