SM6T68CAHE3/5B

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TVS - Diodes

Transient Voltage Suppressor (TVS) diodes are solid-state devices designed to protect sensitive electronic components from high voltage transients produced by lightning strikes, electrostatic discharges, and other sources of transient voltage. Devices such as the SM6T68CAHE3/5B can provide a wide range of protection against many types of transients.

Application Field

TVS diodes like the SM6T68CAHE3/5B are used to protect electronic systems from damaging voltage transients. These transients can cause permanent damage to components, such as microprocessors and other sensitive devices. Transient protection is important in many areas, including automotive, medical, industrial, military, and consumer electronics applications.

Automotive applications require high levels of transient protection due to the wide range of voltage spikes potentially present on the automotive 12V bus. The SM6T68CAHE3/5B is particularly well suited for automotive applications as it is able to dissipate up to 1000 Amps of energy over an 8/20 μs waveform while still maintaining an impressive clamping voltage. This allows its use in applications where high current transients or voltage spikes are expected.

Industrial control systems often need to be protected from high voltage transients, even when large motors are operating. The SM6T68CAHE3/5B can be used to protect these systems from surges due to switching of motor loads, lightning strikes, and other unexpected transients.

Working Principle

TVS devices like the SM6T68CAHE3/5B are built using specialized silicon die which provides an increased junction area over a normal diode. This increase in area allows the device to absorb more energy before junction breakdown takes place. When a voltage transient occurs, the TVS device acts like a normal diode until the clamping voltage is reached at which point the device begins to conduct, limiting the voltage change on the protected line.

The SM6T68CAHE3/5B has a Uni- and Bi-directionality feature which means it can protect in both directions, regardless of whether the transient is positive or negative. By providing uni- and bi-directional protection, the device will protect the equipment even if the pulse is applied to either the anode or the cathode. This feature is helpful for applications where transient pulses come from unpredictable sources.

The SM6T68CAHE3/5B is a hybrid device, meaning that it is composed of both an thyristor and a diode. The thyristor gives the device the ability to protect against larger energy transients while the diode allows for increased current handling capabilities. As a result, the thyristor-diode combination is able to provide more robust protection than a standard diode.

The SM6T68CAHE3/5B also includes an integrated Overvoltage Suppression (OVS), which is designed to protect against overvoltage conditions. OVS prevents damage from constant voltage slopes such as electromagnetic interference (EMI) or the ringing that can occur near a fast-switching node. This feature helps to ensure a system’s reliability in applications where both overvoltage and transient protection is required.

TVS devices like the SM6T68CAHE3/5B are an important component in the protection of sensitive electronic equipment. By providing a wide range of protection against transients, OVS, and other conditions, the SM6T68CAHE3/5B ensures that electronic systems remain safe under all conditions.

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