CM1214A Datasheet, PDF (8/14 Pages) California Micro Devices Corp – 1 and 2 Channel PicoGuardTM AC Signal ESD Protector

CM1214A
Application Information
CM1214A-01SO
The CM1214A-01SO protects a single bipolar signal line often found in RF circuits. One I/O pin (pin 1 for
example) is connected to the signal line for protection, and the other I/O pin is tied to GND. It is important to
have a solid ground connection to reduce the clamping voltage. Pin 3 of the 3-lead SOT23 must be left open
(and not connected on the PCB).
CM1214A-02MR
The CM1214A-02MR protects two bipolar lines, such as for Gbit Ethernet. The PCB traces underneath the
package connect across to the corresponding pins (Pins 1, 4, 6 and 7). Pins 2, 3, 5 and 8 of the MSOP-8
package must be left open (and not connected on the PCB).
Any disturbance on the line above or below the standoff voltage is clamped.
Figure 7. Typical Application - RF Switch and Amplifier Protection,
CM1214A-01SO in 3-lead SOT23
Figure 8. Typical Application - Ethernet Protection, CM1214A-02MR in 8-lead MSOP
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