SA64AHE3/54 Circuit Protection

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The SA64AHE3/54 from NEXPERIA is a high-current, low-capacitance, unidirectional, PESD3V3U series TVS Diode. It is designed to offer transient protection in the most demanding industrial applications, and provides protection against surges up to 8 A. It is a low-capacitance diode that is useful in protecting high-speed data lines, such as USB, HDMI, 1394, and Ethernet. It also has the ability to protect against negative transients up to −10 A.

The SA64AHE3/54 is designed for surface mount applications and is housed in a leadless 3-pin SOT-23 package. It is a RoHS-compliant TVS diode with an ultra low on-state capacitance of 0.6 pF and a low reverse leakage current of 5 μA. It also features an operating junction temperature range of −40 to +125 °C and a clamping voltage of only 3.15 V at 8 amps.

The SA64AHE3/54 is ideal for use in automotive, industrial, and consumer electronic applications. Its ability to protect against negative transients makes it suitable for use in motor control applications, power supplies, or protection against shorted USB lines. It can also be used in portable handheld devices, Raspberry Pi applications, tablets, and internet of things (IoT) devices.

The main function of a TVS diode is to protect delicate ICs and other elements from pinched off or overvoltage events. The SA64AHE3/54, as a unidirectional TVS diode, can protect only against current flow in one direction. It is connected in parallel with the device that needs to be protected. During a surge or transient, the diode will become forward-biased and allow the current to flow through it rather than through the protected device. The diode can absorb the excess energy of a surge and limit the voltage to a safe level.

Once the transient is over, the diode will reset itself and continue to protect the device until another transient event happens. It is important to note that a TVS diode does not “absorb” the surge, but rather diverts the energy to a ground path. This ensures that the protected device is not damaged by the surge.

Overall, the SA64AHE3/54 is a reliable and cost-effective way to provide surge protection in a wide range of applications. Its excellent performance, low on-state capacitance, and low-leakage current make it an ideal choice for protecting high-speed lines, motor control applications, power supplies, or protection against shorted USB lines.

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