Different devices have different levels of sensitivity to electrostatic discharge, or ESD. Thus, there needs to be a way to distinguish ESD-sensitive devices from those which are not as vulnerable to ESD. Each of the ESD models used in ESD sensitivity testing has its own classification system for categorizing devices according to their ESD sensitivity.
En enhets ESD-känslighet anges vanligtvis i termer av den högsta ESD-testspänningen som den klarar och den lägsta ESD-testspänningen som den misslyckas med per ESD-modell. Således uttrycks ESD-känslighet ofta som ett intervall av ESD-spänning som en enhet säkert kan utsättas för för var och en av ESD-modellerna. Följande tabeller visar ESD-känslighetsklassificeringsnivåerna som definierats av ESD Association för varje ESD-modell.
Tabell 1. ESDS-komponentkänslighetsklassificering - Människokroppsmodell
(Per ESD STM5.1-1998)
Tabell 2. ESDS-komponentkänslighetsklassificering - Maskinmodell
(Per ESD STM5.2-1999)
Tabell 3. ESDS Component Sensitivity Classification - Laddad enhetsmodell
(Per ESD STM5.3.1-1999)
A complete ESD characterization of every new product prior to its release is highly recommended. Complete ESD characterization consists of subjecting the device to ESD testing for all of the three ESD models, i.e., HBM, CDM, MM. Data for one ESD model can not be substituted for those of the other ESD models, since good ESDS test results for one model doesn't necessarily mean that the test results will also be good for the other ESD models. Thus, a company that takes its ESD program seriously must equip itself with ESD tester(s) capable of performing the required ESD tests for each of the test models.
