ESD Classifications

There are 3 classifications based on 3 different ESD models which are detailed standards from the ESD Association:
http://esda.org/

  1. (1) Human Body Model (HBM) [100 pF @ 1.5 kilohms], ESD STM5.1
  2. (2) Charge Device Model (CDM) [4 pF/30 pF], ESD DS5.3.1
  3. (3) Machine Model (MM) [200 pF @ 0 ohms], ESD STM5.2

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 (6×10^-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 ESD-STM5.1 Human Body Model (HBM)Component Level paragraph 4
Table 1-HBM ESDS Component Classification

Class
0
1A
1B
1C
2
3A
3B
Voltage Range
< 250
250 to < 500
500 to < 1000
1000 to < 2000
2000 to < 4000
4000 to < 8000
> or = 8000

To continue reading about ESD Classifications Click Here

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Posted on November 23, 2011, in Article, ESD Information and tagged , , , , , , , , , , , , , , , , , . Bookmark the permalink. Leave a comment.

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