TVS COMPONENT FUNDAMENTALS The What, How, Why & Where of Protection

TVS COMPONENT FUNDAMENTALSTVS COMPONENT FUNDAMENTALSTVS COMPONENT FUNDAMENTALSTVS COMPONENT FUNDAMENTALS

The What, How, Why & Where of ProtectionThe What, How, Why & Where of Protection

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What is a TVS Component?

Acronym for Transient Voltage Suppressor A.K.A.: Surge Protective Device Component

(SPDC) Available Technologies

Avalanche Breakdown Diode (ABD) A.K.A.: TVS Diode

Metal Oxide Varistor (MOV) Steering Diodes (SD) Thyristor Surge Suppressor (TSS) Gas Discharge Tube (GDT)


What is a TVS Component?

TVS Components

Gas Discharge Tube

Metal Oxide Varistor

Avalanche Breakdown Diode

Thyristor Surge Suppressor

Steering Diode

Industry Designation

GDT

MOV

ABD

TSS

SD

Application

Telecom/ Data Line

Secondary AC Power Line

Board Level/ Data & DC Pwr

Telecom/ Power Cross

High Speed I/O Port


How does a TVS Component Work?

TVS Devices Do: Clamp Transient Voltages Divert Transient Currents Protect Between Line-to-Line & Line-to-Ground

TVS Devices DO NOT: Interfere with Signal Integrity Cause Excessive Insertion Loss Conduct Excessive Leakage Current


How Does a TVS Diode Work?

Similar to a Zener Diode with a larger junction area characterized for voltage suppression

Unidirectional and Bidirectional Configurations


How Does a TVS Diode Work?

The positive transient is clamped by the TVS.


Disadvantages of Other Technologies

Polymer Suppressors High Clamping Voltage, Fails Short & Wear Out

Zener Diodes Limited Peak Pulse Current Capability

On-Chip Protection Networks Limited Peak Pulse Current Capability & High

Clamping Voltage


Comparison Chart

GDT

MOV / TSS

ABD / MLV / SD

100,000

10,000

1,000

100

10.1 1 10 100 1,000

Td – Pulse Duration - µs

I PP –

Peak

Puls

e C

urr

ent

- A

mps


Comparison of MLV and TVS Comparison of MLV and TVS F.C.F.C.

ProTek

5 Volt Flip Chip

P0402FC05C

Competitor

5 Volt Part

VC060305A150

Comparison 1

< 0.7nH< 1.0nHInductance

100pF @ 1 MHz825pFCapacitance

9.8V @ 1-2A>15.5VClamping Voltage

6V @ 1mA7.6VMin. Breakdown Voltage

5V5.6VWorking Voltage


Why Use TVS Components?

Industry Standard Requirements ESD, EFT, Lightning – ENxxxxx or IEC Standards

Field Failures Cost of Compliance

Secondary Lightning Effects Smaller IC Components Higher Pin Density ICs

Due to miniaturization pins are closer together


Where are TVS Components Used?

Protection is Required at All Levels Printed Circuit Board (PCB) Equipment Systems (Buildings)

Examples: Modems, DSL Router Interfaces Ethernet I/O Ports USB, FireWire Ports AC Power Lines Power Bus Ports Keyboards, Ear Pieces & Antennas


Coordinated Protection

I/O Ports – Transients Power Bus – Transients Ground – Ground Bounce Shielding – EMF/RFI


Key Parameters for TVS

Ip: Peak current for certain surge waveform Vbr : Breakdown voltage, larger than operating

voltage Vwm Vcmax: Maximum clamping voltage (@ Ip) Cj: Capacitance(operating frequency) Ir: Leakage current (@ operating voltage Vwm)


Key Interface Locations

Application

AC PowerDC Power BusTelephoneData Lines (Signal)Video

587BxxxLP PACxxx30KPAxxTEL185E485ELCCX12ELC

PIP12015KPAxxPLC01-6SMLCxxCPLC03-6

15KPAxxCPSDxxPPxxxxSC,SBULC0402FCxxC ET724GBLCxxC SRV05-4


Computer I/O Ports

Application

USB, DATA Lines

RS-485

FireWire (IEEE 1394)

DC Power Bus

Circuit

I/O Port

Hand-Held Computer

Network Interface

Internal Power Supply

ProTek Devices

PSR05 or SRV05-4

SMDAxxLCC PSM712

GBLCxxC

PSD or P0402FCxxC


Telecom Central Office Applications

Application

High Speed Modem

Telecom Interface Card

Intrabuilding Telecom

Circuit

T1/E1, I/O Port

T1-to-Ethernet

T1 Protection

ProTek Devices

PP3100SB/SC & PLC03-3.3

GBLCxxC PSOTxxC

SMLCxxC-2 PLC01-6


Cellular Phones

Application

Ear/Microphone

SIM Card

Edge Connector

LCD Module

Antenna

Circuit

Voice

Processor

Data Port

Video

RF

ProTek Devices

SFT701 & EMIF2-xxFCC

GBLCxxC & PSLCxxC

GBLCxxC, SFC05-4 & SFC05-5 EMIF6-100LFC

SLVU2.8-4 & EMIF10Q-200

GBLCxxC


Military Applications

Application

Communication Ckts

DC Power Supply

Shipboard AC Power

Data Comm Lines

Circuit

CAN Bus

28V dc Bus

120V ac Bus

RS-485

ProTek Devices

PLC03-6, PUSB6B, PSR05

704-15K36/36T

PHP/PIP120

DLZxxCA 485ELC


Design Specific Devices

ProTek Devices

SMLC6.5C-2

P0402FC05C

PLC01-6

PLC03-6

PP0901SA

PSR05

PP3100SC

GBLCxxC

STF701

ULC0402FC05C

Application

T1/E1 Access

Wireless Phone

Long-haul Line

Short-haul Line

Soft Modem

ISDN S/T

Modem

Ethernet

PDB

Cell Phone

Threat

GR 1089

EN61000-4-2

EN61000-4-5

EN61000-4-4

GR 1089-2nd

EN61000-4-2

GR 1089-2nd

IEC 61000-4-2

IEC 61000-4-2

IEC 61000-4-2


Video Applications

Recommended Devices:1. SRV05-42. ET724, ET7213.EMIFxx-xxx Series


Video Circuit Application

Recommended TVS Components: PLCDA05C-6Optional Devices: GBLC03C & SLVDA2.8LC


Audio Applications

Audio Drive

Audio Drive

Recommended Devices1. TVS/EMI filter EMIFxx-xxx2. FC TVS diode array

Speaker Speaker

MicrophoneMicrophone


Gigabit Ethernet Application

Recommended ProductsLightning protection:PLC03-3.3, -6Differential ESD ProtectionVertical TVS

•SLVU2.8-4, -8•SLVDA2.8LC


DSL MODEM protection circuit

LINE SIDEIC SIDE

PPxxxxSB,SC

PLC03-3.3, PLC03-6

PTCPTC


Data DSL Modem

Secondary lightning and ESD Protection

Preferable devices: Vertical TVS

•PP3100SB, EB•PP2300SB, EB


USB 2.0 and Firewire Applications

Differential ESD Protection

Preferable devices: PSR05, Flipchip arrayGBLC03C


Shipboard AC Power

330 Ohm

500 Microhenry

500 Microhenry

Recommended TVS Components: 60/90KS200C & PHP120


Power Application

ESD protection

Preferable devices:PSOT05C, Flipchip


RS-485 or RS-232 Application

Recommended TVS Components: PUSB6B, PSR05, SMDAxxLCC, PSM712

Low Capacitance Protector Network


CAN Bus Application

I/O

Port

Recommended TVS Components: PUSB6B & PSR05


Ethernet Applications

10/100 Base T

Recommended TVS Components D1 PLC03-3.3, D2, & D3: GBLC03C, SLVDA2.8LC & PLCDAxxC Optional Devices: IO6LC & USB004


Medical Applications

LCD Display EMIFxx-xxx Series Pump SMDAxx Series SLVU2.8 Sensors PSOTxx Series Implanted Devices GBLCxxC SLVU2.8

ULC040xFCxxC

SMDAxxSMDAxx

SLVU2.8SLVU2.8

GBLCxxCGBLCxxC

PSOTxxPSOTxx

EMIFxx-xxxEMIFxx-xxx


Microprocessor Application

Recommended DeviceRecommended Device

GBLCxx ULC040xFCxxC GBLCxx ULC040xFCxxC PSMSxxCPSMSxxC


AC Power Applications

The Clamping Voltage Waveform on PAC240

(10kA current, 8/20us per IEC61000-4-5)


DC Motor Application

Load

Recommended Product

GPZ532 GPZ1275

10kW and 30kW

++

GPZ532


Steps to Cost-Effective Protection

Determine Environmental Threat Source Lightning, Switching, ESD, EFT, EMI/RFI

Identify Probable Entry Point(s) System, Equipment, Card Edge or IC Component

Estimate Transient Threat Level Transient Current, Duration & Industry Standard

Select TVS Component or Device Match TVS Parameters to Threat & Circuit Requirements

Design Circuit and/or PCB Layout Low Impedance Return Path (Ground)

Verify Circuit Performance For Functionality, Conformance & Compliance


IC Failure from ESD without TVS


Contact ProTek

Quotes & Domestic Sales Rick Heinz: [email protected] Steve Bulissa [email protected]

Customer Service Lana Tassinari: [email protected] Amy Parker: [email protected]

Applications & New Products Ivan Lawson: [email protected] Han Zou: [email protected]

International Sales V.P. Pai: [email protected]

Marketing Paulett Greer: [email protected]

Documents

TVS COMPONENT FUNDAMENTALS The What, How, Why & Where of Protection