The test was implemented according to the flow of Figure 3, and the rank of the withstand voltage is classified according to Table 1. The capacitance of the test capacitor affects the voltage that occurs on both sides of a capacitor. The following relationship is established between the capacitance Cx of the test capacitor, and the voltage Vx that occurs on both sides. While the supply voltage Vd and the capacitance of the charging capacitor Cd is constant, the voltage Vx that occurs on both sides of the test capacitor becomes lower as the capacitance Cx of the test capacitor becomes larger.
Solving IEC System Protection for Analog Inputs
ESD Resistance of Capacitors | Murata Manufacturing Co., Ltd.
Electrostatic discharge ESD events are recognized as a significant contributor of early life failures and failures throughout the operating life of semiconductor devices. An ESD event may carry amperes of current in a short period of time, typically from hundreds of pico-seconds to hundreds of nano-seconds. Needless to say such events are very harmful for sensitive electronic components and integrated circuits ICs. For the purposes of reproduction under controlled conditions, the real word ESD events are classifieds in three main categories under which electronic elements or ICs are tested:. The machine model MM represents a discharge coming from a charged machine into a grounded IC. This ESD model is typically used in automotive assembly lines. The charge device model CDM covers the ESD discharge when a device or an IC is self-charged during the manufacturing process and comes into the contact with grounded equipment.
In my next project I plan to conductive pads as buttons that are exposed for humen touch to interacte with the one is connected to ground and the rest will connect directly to the nrf chip with an internal pullup resistor. Now the question is how safe this setup would be against ESD as there will be a direct contact with the man and the pad? However, the typical static charge that a human body can hold is usually in the 1 kV, but might be as high as 25 kV, see below quote from Wikipedia. Maximum potential commonly achieved on human body range between 1 and 10 kV, though in optimal conditions as high as 20—25 kV can be reached.
Sanjay Agarwal Mar 03, Electrostatic discharge ESD and electrostatic overstress EOS events can happen anywhere such as fabrication and assembly process areas, production testing environments, transportation, and field applications. Due to improper grounding, test and handling equipment can accumulate static charge, which is transmitted through ICs when it comes in contact. Semiconductor devices include ESD protection circuitry. CDM simulates the discharge of a charged device when it comes in contact with a conductive material.