1.5KE91 Circuit Protection

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1.5KE91, which belongs to the Transient Voltage Suppression (TVS) - Diodes, is a widely used unidirectional protection product. As a key component in a variety of electronic product designs, it provides an effective method to protect the host’s circuitry from damage caused by unprotected power surges and ESD. Nowadays, 1.5KE91 is widely used in vehicle electronics, consumer electronics, automotive, industrial control, automotive medical and smart grid, etc.

1.5KE91´s form factor is a DO-201 package on an SMD (surface-mounted device) ceramic substrate, which has a customizable varistor voltage, a low clamping voltage rating, and an extremely fast response time.

1.5KE91´s working principle is based on the concept of RC network. When the erratic voltage generates, the special circuit design will limit part of the instantaneous current and reduce the amplitude and duration of the overvoltage pulse, so that the working voltage of the circuit keeps within a safe range.

The special circuit design is composed of three parts: an RC triggering network, two PN junctions, and a shunting resistor. In an off-state, the device is always in the same resistance status, and kept in a low impedance status. When an impulse voltage comes from the outside, the RC triggering network will trigger the overvoltage protection circuit, triggering the PN junction to produce an abrupt voltage drop. The shunting resistor prevents a large current flow and protects the circuit from over-current damages.

In conclusion, 1.5KE91 is a type of widely used transient voltage suppression device that is intended for use in a variety of electronic product designs, providing effective protection from power surges and ESD. It has a DO-201 package on an SMD ceramic substrate, a customizable varistor voltage, a low clamping voltage rating, and an ultra-fast response time. Moreover, its working principle is based on an RC triggering network combined with two PN junctions and a shunting resistor.

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