ESD321 1-Channel 30kV ESD Protection Diode with Low Capacitance (< 1pF) in

0402 and SOD-523 Packages

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.

Package Information

PART NUMBER

PACKAGE(1)

PACKAGE SIZE(2)

ESD321

DPY (X1SON, 2)

1mm × 0.6mm

DYA (SOD-523, 2)

1.6mm × 0.8mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

The package size (length × width) is a nominal value and

includes pins, where applicable.

5-V Source

USB Transceiver

2

1

2

1

VBUS

D±

D+

GND

Typical USB 2.0 Application Schematic

ESD321

SLVSEN8C – JULY 2018 – REVISED JUNE 2025

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.