SMCJ16ATR

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Transient Voltage Suppression (TVS) diodes are an important line of protection components used to protect circuits from various transients (voltage spikes). Specifically, the SMCJ16ATR, a unidirectional TVS Diode, is designed for use in general purpose AC/DC lines on printed circuit boards, offering an ultra-wide operational voltage range of 5V to 1000V. This article will explore the relevant application field and working principle of the SMCJ16ATR.

Provided Parameters and Usage

The SMCJ16ATR features a peak pulse power rating of Ipp = 16A @ tp = 10/1000µs, meaning it can handle a pulse of 16A for 10µs (on) and 1000µs (off). In terms of capacitance, the maximum junction capacitance is typ. 8pF @ VR=4V and a typical reverse stand-off voltage of 25V.

Typically, the SMCJ16ATR is used as an EOS (Electrically Over Stress) protection device to protect against transient voltage surges, in circuits like DC-DC converters, AC-DC power supplies, devices with on-board I/O systems, LED lighting, higher power application circuits, power switching, and more.

Packaging and Chip Analyses

The SMCJ16ATR comes in a SMA package, which is a small surface-mount package designed to be mounted on the surface of a printed circuit board (PCB). Furthermore, the SMA package size is 7.1mm [2] x 4.7mm [0.8], making it suitable for a wide range of PCB designs.

The chip itself is constructed with a high-energy nonlinear junction that is designed to absorb and clamp high energy transients. In addition, it is designed with an ultra-wide operating voltage range that helps to increase its effectiveness in diverting transients away from the circuit.

Working Principle

When a transient voltage occurs, the high-energy nonlinear junction within the SMCJ16ATR quickly clamps the voltage to a safe level, which helps to protect the connected circuit and equipment.

In more detail, when operating beyond the breakdown voltage of the junction, the nonlinear junction exhibits Zener-like behavior, allowing a reverse current flow by breakdown, and by the avalanche effect (the electrons gain energy from applied voltage and release it as energy by collision, thus sustaining the current flow beyond the breakdown voltage).

This makes it capable of absorbing large amounts of energy, thus protecting the circuit from various transient voltage surges.

Drawbacks

As with all electrical components, there are some drawbacks to using the SMCJ16ATR diode. One obvious draw-back is that due to the SMA package size, it can be harder to mount, requiring more time and precision. Furthermore, it may not be appropriate for circuits that require transient voltage suppression over a wider voltage range.

Conclusion

Overall, the SMCJ16ATR diode is a great choice for general purpose AC/DC lines requiring a voltage range of 5V to 1000V, with excellent performance in absorbing and clamping transients. It is small and easy to integrate into most circuits, and offers benefits such as the ultra-wide operational voltage range and peak pulse power rating. While there are some drawbacks to consider, it is nonetheless a reliable and efficient transient voltage suppression wired device.

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