The difference between TVS tube and ESD protection diode

TVS transient voltage suppression

Regardless of how TVS is generated here, such as surges caused by direct or indirect lightning strikes, electrostatic discharge, large capacity load switching, and other factors The voltage ranges from a few volts to tens of kilovolts or even higher.

ESD electrostatic discharge protection

The ESD here is mainly described by three models

The main applications are HBM and MM. Simply put, it means that people or equipment discharge (static electricity) onto the device, but the device cannot be damaged

The typical HBM CLASS 1C model specifies that a 100pF capacitor charging 1000V-2000V discharges the device through a 1500 ohm resistor

The MM model has more energy than the human body model The capacitance is 200pF, and the voltage is approximately between 200-400, but there is no series resistor

Typical human body model discharge, peak current less than 0.75A, time 150ns

Typical machine model discharge, peak current less than 8A, time 5ns

A typical lightning surge (TVS used at the power line inlet) has a peak current of 3000A and a duration of 20us.

The principle is the same, but it is different based on power and packaging

When comparing ESD and TVS, it depends on the intended use. ESD is mainly used for anti-static purposes, which require a low capacitance value, generally between 1-3.5PF, which is the best TVS cannot achieve this, as its capacitance value is relatively high

By conducting+/-8KV contact discharges in accordance with the IEC61000-4-2 standard, and analyzing the captured IEC waveform, it can be concluded that the TVS protection performance is many times stronger than that of surface mount varistors

Varistors use the principle of physical absorption, and after each ESD event, the material will suffer certain physical damage, forming a permanent leakage channel. TVS, on the other hand, uses the semiconductor clamping principle, which instantly transfers energy during ESD events without affecting the device itself

Both can achieve a capacitance of less than 1pF in terms of junction capacitance

The 0603-060E0R20P-LF varistor has a working voltage of 5V and a capacitance value of 0.2pf in the 0603 package, which is currently the lowest capacitance value in the industry Mainly used for HDMI and VGA ports, but other ports can also be used

Performance and features:

1. Extremely low capacitance (<0.2pF), providing ideal high-speed data transmission port protection

2. Frequency response range: 0-6GHz

3. Contact discharge: 8KV (IEC 61000-4-2)

Air discharge: 15KV (IEC 61000-4-2)

ESD electrostatic discharge protection has a fast response time of less than 1 second and fully meets the IEC 61000-4-2 international test standard for electrostatic discharge immunity

BS0060SS (SOD-123) Superjunction Capacitor TSS Diode

characteristic:

Meets IEC61000-4-5 surge withstand capacity: 15A (10/1000 μ S)

IEC 61000-4-2 (ESD) ± 15 kV (air), ± 8 kV (contact) non-polar, bidirectional surge protection, good absorption characteristics

Their application scenarios are different. TVS is generally used for primary and secondary protection, while ESD is mainly used for board level protection. TVS (transient voltage suppressor), while ESD (electrochemical discharge) Choosing a TVS generally depends on the power and packaging of the device,

ESD devices are generally valued for their ESD rating (HBM/MM) and IEC61000-4-2 LEVEL. High speed USB and I/O attach great importance to their performance. Of course, their performance is also important IPP.VC.Vbr.Vm is also important