Dear ,
At this newsletter we will focus on CDM and share the article about CDM by Certus Semiconductor Inc.
Certus Semiconductor is a Unique IO & ESD Solution Company
Certus assembled several of the world’s foremost experts in IO and ESD design to offer our clients the ability to affordably tailor their IO libraries into the optimal fit for their products.
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Why CDM?
The qualification requirements for integrated circuits for both JEDEC [1] and the Automotive Electronics Council (AEC) [2], require ESD testing for both Human Body Model (HBM) and Charged Device Model (CDM). Despite this requirement, examination of integrated circuit datasheets often does not include ESD data, and when they do it is overwhelmingly HBM data, with CDM data seldom included. The Electrostatic Discharge Association’s device testing working group 5.0 found the lack of ESD data, and especially the lack of CDM data troubling enough that it recently published a Standard Practice Document [3] recommending a format for reporting ESD data in datasheets. In the recommended format the CDM data format was placed before the HBM data format, and that was not just due to alphabetical order. It was to emphasize the importance of CDM data. The lower representation of CDM with respect to HBM is also reflected in Minotaur Labs experience. We receive about twice as many requests for HBM testing as for CDM testing.
So, why perform CDM testing if the industry appears to treat it as less important than HBM? This blog post will try to explain why CDM represents a real threat to integrated circuits in a modern manufacturing environment. We will start with a very traditional explanation of a CDM event, but then will discuss how this relates to a today’s manufacturing environment.
Classic CDM Event
The classic example of a CDM event is shown in Figure 1, a shipping tube of integrated circuits is dumped onto a grounded metal bench. Depending on the material of the integrated circuit (IC) and the anti-static properties of the shipping tube the IC can become charged with value Q. The voltage of the integrated circuit depends on the charge on the IC and its capacitance with respect to the metal table, CDUT. Since the capacitance between the IC and the table’s surface is likely small, pF range, the IC to table voltage can become quite large, hundreds of volts.
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