What is ESD human body model?

The human-body model (HBM) is the most commonly used model for characterizing the susceptibility of an electronic device to damage from electrostatic discharge (ESD). The model is a simulation of the discharge which might occur when a human touches an electronic device.

What is ESD Modelling?

There are several ESD models including charged device model (CDM), machine model (MM), and human body model (HBM). Of these, the HBM is most commonly used to test and rate capacitors. The CDM is one of the most neglected models. This ESD event occurs when a device slides down a tube, bag, or similar source.

What is MM in ESD?

The Machine Model (MM) is the ESD model which is intended to simulate abrupt discharge events which are caused by contact with equipment and empty sockets (functional test, burn in, reliability testing, etc.). The model was developed in Japan and is widely used there.

How much ESD can a human produce?

Electrostatic Charging In an ESD event, the human body can reportedly generate static charge levels as high as 15,000 volts by simply walking across a carpeted floor and 5,000 volts by walking across a linoleum floor.

How is ESD testing done?

The testing conducted consists of applying one positive and one negative pulse to the component, allowing a 0.3 second interval between pulses. A set of devices is exposed to these pulses at a given voltage level and pin grounding combinations; the device is tested for full static and dynamic parameters.

What is HBM voltage?

Also, the protection voltage level for HBM typically is ~2 kV while for MM it is ~200 V and for CDM it is ~500 V.

What is a mm test?

Also known as the 0-Ω model, MM is designed to simulate a machine discharging through a device to ground. Failure modes in MM testing are similar to those in HBM testing. In the test setup, a high-voltage (HV) supply in series with a resistor charges a capacitor.

What voltage can humans feel?

Another recognizable effect of static electricity is the shock you receive when you slid out of a car in dry weather conditions and feel a zap. The human body feels a shock when the voltage is higher than about 3,500 volts. Walking over a carpet can generate 35,000 volts.

Why ESD test is done?

ESD testing is an electromagnetic compatibility test (EMC test). ESD testing simulates various electrostatic impacts that equipment might experience either during transit or operation. An electrostatic discharge test determines whether a product is in compliance with its ESD protective area and procedures.

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