1 Features
• IEC 61000-4-2 Level 4 ESD protection:
– ±30kV contact discharge
– ±30kV air gap discharge
• IEC 61000-4-4 EFT protection:
– 80A (5/50ns)
• IEC 61000-4-5 surge protection:
– 6A (8/20μs)
• IO capacitance: 0.9pF (typical)
• DC breakdown voltage: 4.5V (minimum)
• Low leakage current: 0.1nA (typical)
• Extremely Low ESD clamping voltage:
– 6.8V at 16A TLP (I/O to GND)
– RDYN: 0.13Ω (I/O to GND)
• Industrial temperature range: –40°C to +125°C
• Industry standard 0402 (DFN1006P2) and
SOD-523 packages

2 Applications
• End equipment:
– Wearables
– Industrial and service robots
– Laptops and desktops
– Mobile and tablets
– Set-top boxes
– DVR and NVR
– TV and monitors
– EPOS (electronic point of sale)
• Interfaces:
– USB 2.0/1.1
– GPIO
– Ethernet 10/100/1000 Mbps
– Pushbuttons
– Audio

3 Description
The ESD321 is a uni-directional TVS ESD protection
diode featuring low dynamic resistance and low
clamping voltage. The ESD321 is rated to dissipate
ESD strikes up to ±30kV per the IEC 61000-4-2
international standard (greater than Level 4).
The ultra-low dynamic resistance (0.13Ω) and
extremely low clamping voltage (6.8V at 16A TLP)
ensure system level protection against transient
events. This device has a low capacitance of
0.9pF IO capacitance making it suitable for
protecting interfaces such as USB 2.0 and Ethernet
10/100/1000Mbps.
The ESD321 is offered in the industry standard 0402
(DPY/DFN1006P2) and SOD-523 (DYA) packages.