SMBJ100AE3/TR13

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The SMBJ100AE3/TR13 (from here on referred to as the device) is a transient voltage suppression (TVS) diode. It is a member of not only the Transient Voltage Suppressor (TVS) family, but also within a subset of TVS diodes known as unidirectional diodes. These diodes serve an important purpose in the management of transient voltage, a sudden increase in voltage in an electrical circuit that can result from inductive transients, ESD, or other sources.

The specific characteristics of the SMBJ100AE3/TR13 are as follows: 100V PPP (Peak Pulse Power); 93.3V Breakdown Voltage; 500A Peak Pulse Current; 5A Ippm (Maximum Average Forward Current); 2ps (Typical Reverse Recovery Time); 1000W Clamping Voltage; and 9.6pF (Typical Junction Capacitance). Additionally, it is rated across the temperature range of -55 to +150C, and is offered in a SOT-663 package.

The main area in which this device is used is in protection circuits, where it acts as a fail-safe from on overwhelming power surge. It is commonly seen in applications where a connection to an external power supply is necessary, such as USB ports, as well as in audio or video equipment, or other digital signal lines. Primarily, this device is used to protect against ESD. As such, it is found in communication systems, consumer electronics, automobiles, and other electronic products.

When considering the working principle of the device, it is necessary to consider the current-voltage (I-V) characteristics of the diode. As most diodes, the SMBJ100AE3/TR13 follows a parabolic curve until breakdown voltage is exceeded, at which point the current begins to exponentially increase. In other words, the device will only pass a forward voltage until it reaches its breakdown voltage, at which point it will then start to pass a voltage which is higher than the forward voltage and the breakdown voltage.

When used in a protection circuit, the device works in the following way. When a surge results in a voltage increase beyond normal steady state values, the device will begin to breakdown, limiting the voltage and thereby protecting the rest of the circuit. An additional important attribute of this device is its ability to quickly recover when the surge subsides - its reverse recovery time of 2ps is typical of other TVS diodes.

To conclude, the SMBJ100AE3/TR13 is a unidirectional TVS diode designed to protect circuits from transient voltages. It excels in applications in which a connection to an external power supply is necessary, as well as in cases where protection from ESD is required. Its I-V characteristics are typical of other TVS diodes, and its reverse recovery time is an impressive 2ps.

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