CM1214A_16 Datasheet, PDF (6/9 Pages) ON Semiconductor – 1 and 2-Channel 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.
RF ANTENNA
LNA
L
C
SIGNAL LINE
SWITCH
ESD
N.C.
PA
GND
ESD
SOT23−3
Figure 7. Typical Application − RF Switch and Amplifier Protection,
CM1214A−01SO in 3−lead SOT23
FROM
ASIC
CH1
CH2
CH3
CH4
TX+
TX−
RX+
TO CONNECTOR
RX−
CM1214A−02MR
CM1214A−02MR
Figure 8. Typical Application − Ethernet Protection,
CM1214A−02MR in 8−lead MSOP
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