Charge Device Model - Desco Asia

Classifications There are 3 classifications based on 3 different ESD models which are detailed standards from the ESD Association: (1) Human Body Model (HBM) [100 pF @ kilohms], ESD (2) Charge Device Model (CDM) [4 pF/30 pF], ESD (3) Machine Model (MM) [200 pF @ 0 ohms], ESD Human Body Model The most common Model is the HBM. This Model simulates when a discharge occurs between a human (hand/finger) to a conductor (metal rail). The equivalent capacitance is 100 picofarads (100 x 10^-12 Farads) and equivalent resistance is 1,500 ohms to simulate a human body. The typical rise time of the current pulse (ESD) through a shorting wire averages 6 nanoseconds (6x10^-9 s) and larger for a higher resistant load. The peak current through a 500 ohm resistor averages 463 mA for a 1,000 volt pre- Charge voltage. Per Human Body Model (HBM)Component Level paragraph 4 Table 1-HBM ESDS Component Classification Class Voltage Range 0 < 250 1A 250 to < 500 1B 500 to < 1000 1C 1000 to < 2000 2 2000 to < 4000 3A 4000 to < 8000 3B > or = 8000 Charge Device Model CDM is the ESDS Device itself that becomes charged (sliding out of a tube/bag/sorter/etc) and when contacting a grounded conductor (table top/hand/metal tool) will discharge to that conductor and may result in damaging ESD.

Machine Model Testing components to the Machine Model (MM). The tests replicate MM failures and tell you the MM ESD sensitivity levels for your Devices.

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  Devices, Model, Charges, Charge device model

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