Application Design Center - Desktop / Notebook

Circuit Protection of Keypad Solutions

Solutions

• SP1003
• SP0504BACT
• SP0504BAHT
• SP0504BAHTG
• SP0504BAJT
• SP0504BAJTG
• V5.5MLA0402
• SP1001

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.