Introduction to TVS Overvoltage Protection Devices Outline Overvoltage

Introduction to TVS Overvoltage Protection Devices

Outline § Overvoltage Protection – The race is on – Clamp vs Crowbar § Key Parameters § Product Families – Part Number Conventions – Axial Leaded § § § P 4 KE, SAC, P 6 KE 1. 5 KE, LCE 3 KP, 5 KP, SLD 15 KPA, 20 KPA, 30 KPA AK 6, AK 10 – Unidirectional vs Bidirectional – Peak Pulse Power PPPM – Double Exponential Waveforms – Reverse Stand-Off Voltage VR – Breakdown Voltage VBR – Surface Mount – Clampin Voltage VC § SMAJ, P 4 SMA, SACB – Peak Pulse Current IPP § SMBJ, P 6 SMB, 1 KSMB § SMCJ, 1. 5 SMC § SMDJ, 5. 0 SMDJ 2 Version 01_100407

The Race is On! Overvoltage Protector Protected Circuit Overvoltage Event 3 Version 01_100407

Clamping Devices vs Crowbar Devices Transient Event Vline Crowbar Devices Clamping Devices Vline Clamp Voltage Trigger Voltage Vline Delatch 4 Version 01_100407

Outline § Overvoltage Protection – The race is on – Clamp vs Crowbar § Key Parameters – Unidirectional vs Bidirectional – Peak Pulse Power PPPM – Double Exponential Waveforms – Reverse Stand-Off Voltage VR – Breakdown Voltage VBR – Clamping Voltage VC – Peak Pulse Current IPP § Product Families – Part Number Conventions – Axial Leaded § § § P 4 KE, SAC, P 6 KE 1. 5 KE, LCE 3 KP, 5 KP, SLD 15 KPA, 20 KPA, 30 KPA AK 6, AK 10 – Surface Mount § § SMAJ, P 4 SMA, SACB SMBJ, P 6 SMB, 1 KSMB SMCJ, 1. 5 SMC SMDJ, 5. 0 SMDJ 5 Version 01_100407

Key Parameters: Peak Pulse Power 6 Version 01_100407

Key Parameters: Peak Pulse Power § Double Exponential Waveforms – Simulate induced lightning events – Rise time & decay time in microseconds 10 x 1000 8 x 20 7 Version 01_100407

Bidirectional vs Unidirectional Bidirectional TVS Unidirectional TVS Voltage – Current (V-I) Curve • Voltage is displayed left to right • Current is displayed up and down 8 Version 01_100407

Key Parameters: VR +I IPP -V IR IT +V VR VBR VC -I Reverse Standoff Voltage 9 Version 01_100407

Key Parameters: VBR +I IPP -V IR IT +V VR VBR VC -I Breakdown Voltage 10 Version 01_100407

Key Parameters: VC +I IPP -V IR IT +V VR VBR VC -I Max Clamping Voltage 11 Version 01_100407

Key Parameters: Ipp +I Peak Pulse Current IPP -V IR IT +V VR VBR VC -I 12 Version 01_100407

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Question 1: True or False § A TVS Diode is intended to provide continuous voltage regulation to a circuit. FALSE 14 Version 01_100407

Question 2: True or False § A TVS Diode is a crowbar type of device that brings the protected line close to ground potential. FALSE 15 Version 01_100407

Question 3: True or False § The continuous power rating of a TVS Diode can be found by multiplying the peak allowable pulse current by the clamping voltage. FALSE 16 Version 01_100407

Question 4: True or False § A bidirectional TVS Diode can be used on a DC line. TRUE 17 Version 01_100407

Question 5: True or False § A Unidirectional TVS Diode is symmetrical and has the same clamp voltage regardless of the direction of current flow through the part. FALSE 18 Version 01_100407

Outline § Overvoltage Protection § Product Families – Part Number Conventions – Axial Leaded – P 4 KE, SAC, P 6 KE § Key Parameters – 1. 5 KE, LCE – Unidirectional vs Bidirectional – 3 KP, 5 KP, SLD – Peak Pulse Power PPPM – 15 KPA, 20 KPA, 30 KPA – Double Exponential Waveforms – AK 6, AK 10 – Surface Mount – Reverse Stand-Off Voltage VR – SMAJ, P 4 SMA, SACB – Breakdown Voltage VBR – SMBJ, P 6 SMB, 1 KSMB – Clamping Voltage VC – SMCJ, 1. 5 SMC – Peak Pulse Current IPP – SMDJ, 5. 0 SMDJ – The race is on – Clamp vs Crowbar 19 Version 01_100407

Part Numbering Conventions • The first portion: Indicates the Peak Pulse Power or the package or both. • The next portion: Indicates either the VR or the nominal VBR • Both voltage conventions are industry standards. • Offering both conventions is a critical driver for sales. 20 Version 01_100407

Part Numbering Conventions § VR – Based Part Numbers – Axial Leaded § § SA, SAC, LCE 3 KP, 5 KP, SLD 15 KPA, 20 KPA, 30 KPA AK 6, AK 10 – Surface Mount § SMAJ, SACB § SMBJ, SMCJ, § SMDJ, 5. 0 SMDJ § VBR – Based Part Numbers – Axial Leaded § P 4 KE, P 6 KE § 1. 5 KE, – Surface Mount § P 4 SMA, § P 6 SMB, 1 KSMB § 1. 5 SMC 21 Version 01_100407

Axial Leaded TVS Diodes Available Axial Packages DO-41 DO-15 AK-6 DO-201 P-600 AK-10 22 Version 01_100407

DO-41 Axial TVS Diodes § P 4 KE (400 W) 23 Version 01_100407

DO-15 Axial TVS Diodes § P 6 KE (600 W) § SA (500 W) § SAC (500 W, Low Cap) TVS Diode Isolation Diode 24 Version 01_100407

DO-201 Axial TVS Diodes § 1. 5 KE (1500 W) § LCE (1500 W, Low Cap) 25 Version 01_100407

P-600 Axial TVS Diodes § § § 3 KP (3000 W) 5 KP (5000 W) 15 KPA (15000 W) 20 KPA (20000 W) 30 KPA (30000 W) SLD (2200 W - 100 x 150000 u. S Waveform) 26 Version 01_100407

AK Series TVS Diodes § AK 6 (6000 A – 8 x 20 u. S Waveform) § AK 10 (10000 A – 8 x 20 u. S Waveform) 27 Version 01_100407

Surface Mount TVS Diodes Available Surface Mount Packages DO-214 AC (SMA J-Bend) DO-214 AA (SMB J-Bend) DO-214 AB (SMC J-Bend) 28 Version 01_100407

SMA Surface Mount TVS Diodes § SMAJ (400 W) § P 4 SMA (400 W) 29 Version 01_100407

SMB Surface Mount TVS Diodes § § SMBJ (600 W) P 6 SMB (600 W) SACB (500 W, Low Cap) 1 KSMB (1000 W) 30 Version 01_100407

SMC Surface Mount TVS Diodes § § SMCJ (1500 W) 1. 5 SMC (1500 W) SMDJ (3000 W) 5. 0 SMDJ (5000 W) 31 Version 01_100407

Axial TVS Diode Summary 32 Version 01_100407

Surface Mount TVS Diode Summary 33 Version 01_100407

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Question 1: True or False § The leakage current of a TVS Diode is measured at its breakdown voltage. FALSE 35 Version 01_100407

Question 2: True or False § If the same pulse current is allowed to flow through both a low power and a high power TVS Diode, the clamping voltage will be lower on the high power device. TRUE 36 Version 01_100407

Question 3: True or False § If a narrow 20µS current pulse is allowed to flow through a TVS Diode, the allowable power level can be higher than the 10 x 1000µS power level indicated on the data sheet. TRUE 37 Version 01_100407

Question 4: True or False § The AK series of TVS Diodes can handle a million watts of power during a transient event. TRUE 38 Version 01_100407

Question 5: True or False § TVS Diode part numbers always refer to the actual breakdown voltage of the device. FALSE 39 Version 01_100407

Introduction to TVS Overvoltage Protection Devices Thank You! 40 Version 01_100407