Circuit Protection of Keypad Solutions

Circuit Protection of Keypad Solutions



Design Notes:

Protection Application:
Keypads and various buttons can be an entry way for ESD into an application. These circuits are low-voltage DC switches, typically less than 5VDC, so capacitance is not a concern.
Solution Description:
The examples contain four lines for demonstration purposes. The actual number will vary by application. A single diode array cab be used to reduce part count. Discrete diodes can also be used to provide the greatest board layout flexibility.
Companion Solutions:
Other solutions within the LF portfolio exist in addition to these recommendations. For example, if discrete diodes with smaller footprint are desired, the SP1005-01WTG (0201) can be used.
Regulatory Issues:
The IEC 61000-4-2 will be the most appropriate standard that applies for these circuits. It supplies a test method for verifying that the end product is not susceptible to ESD events.
Unique Features:
Application Warnings:

Solutions

Solutions