ESD Suppressor Product Selection Guide

ESD Suppression

Technologies

Protection

Technology

Data Rate

Span

Peak/

Clamp

(8kV)

ESD

Surge

Level

Discrete

Options

Array

Options

Applications

and Circuits

Key

Advantages

Multilayer Varistor

(MLVs)

< 125Mbps

Good

0402

0603

0805

1206

Keypad/switch,

audio, analog video,

USB1.1, RS232

Lowest cost;

broad discrete offering

SPA™

Silicon Protection

Arrays

0 -> 5Gbps Excellent

Excellent SOD723

SOT23

SC70

SOT553

SOT563

SOT953

MSOP 8

MSOP 10

µDFN

Keypad/switch,

USB1.1, USB2.0,

audio, analog video,

FireWire 1394,

HDMI, Ethernet,

MMC interface,

LCD module.

Lowest peak and

clamp voltages

PulseGuard®

ESD Suppressors

100Mbps -> 5Gbps Good

Good

0402

0603

SOT23

USB2.0, FireWire 1394,

HDMI, RF antenna

Lowest capacitance

When to Choose PulseGuard

ESD Suppressors

•

The application tolerates very little added capacitance (high speed data lines or RF circuits)

•

ESD is the only transient threat

•

Protection is required on data, signal, and control lines (not power supply lines)

When to Choose SPA

Silicon Protection Arrays

•

The device being protected requires the lowest possible clamp voltage,

low capacitance (0.65pF – 30pF) and low leakage (0.02µA – 10µA)

•

Board space is at a premium and space-savings multi-line protection is needed

•

Transients other than ESD, such as EFT or lightning, must also be considered

When to Choose Multilayer Varistors (MLVs)

•

Surge currents or energy beyond ESD is expected in the application (EFT, lightning)

•

Looking to replace high wattage TVS Zener diodes (300W – 1500W)

•

Added capacitance is desirable for EMI ﬁ ltering (3pF – 6000pF)

•

Power supply line or low/medium speed data and signal lines are to be protected

•

The operating voltage is above silicon or PulseGuard

ESD suppressor ratings

LITTELFUSE ESD SUPPRESSION TECHNOLOGY COMPARISON

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