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
– Clampin Voltage VC
– Peak Pulse Current IPP
Product Families
– Part Number Conventions
– Axial Leaded
 P4KE, SA, SAC, P6KE
 1.5KE, LCE
 3KP, 5KP, SLD
 15KPA, 20KPA, 30KPA
 AK6, AK10
– Surface Mount
 SMAJ, P4SMA, SACB
 SMBJ, P6SMB, 1KSMB
 SMCJ, 1.5SMC
 SMDJ, 5.0SMDJ
2
Version01_100407

The Race is On!
Overvoltage Event
Overvoltage
Protector
Protected
Circuit
3
Version01_100407

Transient Event
V line
V line
Clamp Voltage
V line
Trigger Voltage
Delatch
4
Version01_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
 P4KE, SA, SAC, P6KE
 1.5KE, LCE
 3KP, 5KP, SLD
 15KPA, 20KPA, 30KPA
 AK6, AK10
– Surface Mount
 SMAJ, P4SMA, SACB
 SMBJ, P6SMB, 1KSMB
 SMCJ, 1.5SMC
 SMDJ, 5.0SMDJ
5
Version01_100407

6
Version01_100407

 Double Exponential Waveforms
– Simulate induced lightning events
– Rise time & decay time in microseconds
10 x 1000
8 x 20
7
Version01_100407

Bidirectional TVS
I I
I I
I I
Unidirectional TVS
I I
I I
I I
Voltage – Current (V-I) Curve
• Voltage is displayed left to right
• Current is displayed up and down
8
Version01_100407

R
+I
I
PP
I
R
I
T
-V
V
R
V
BR
V
C
+V
-I
Reverse Standoff Voltage
9
Version01_100407

BR
+I
I
PP
I
R
I
T
-V
V
R
V
BR
V
C
+V
-I
Breakdown Voltage
10
Version01_100407

C
+I
I
PP
I
R
I
T
-V
V
R
V
BR
V
C
+V
-I
Max Clamping Voltage
11
Version01_100407

pp
+I
Peak Pulse Current
I
PP
I
R
I
T
-V
V
R
V
BR
V
C
+V
-I
12
Version01_100407

13
Version01_100407

Question 1: True or False
 A TVS Diode is intended to provide continuous voltage regulation to a circuit.
FALSE
14
Version01_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
Version01_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
Version01_100407

Question 4: True or False
 A bidirectional TVS Diode can be used on a DC line.
TRUE
17
Version01_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
Version01_100407

Outline


Overvoltage Protection
– The race is on
– Clamp vs Crowbar
Key Parameters
– Unidirectional vs Bidirectional
– Peak Pulse Power PPPM
– Reverse Stand-Off Voltage VR
– Breakdown Voltage VBR
– Clamping Voltage VC
– Peak Pulse Current IPP
 Product Families
– Double Exponential Waveforms
– Part Number Conventions
– Axial Leaded
– P4KE, SA, SAC, P6KE
– 1.5KE, LCE
– 3KP, 5KP, SLD
– 15KPA, 20KPA, 30KPA
– AK6, AK10
– Surface Mount
– SMAJ, P4SMA, SACB
– SMBJ, P6SMB, 1KSMB
– SMCJ, 1.5SMC
– SMDJ, 5.0SMDJ
19
Version01_100407

Part Numbering Conventions
• The first portion: Indicates the Peak Pulse Power or the package or both.
• The next portion: Indicates either the V
V
BR
R or the nominal
• Both voltage conventions are industry standards.
• Offering both conventions is a critical driver for sales.
20
Version01_100407

Part Numbering Conventions
 V
R
– Based Part Numbers
– Axial Leaded
 SA, SAC, LCE
 3KP, 5KP, SLD
 15KPA, 20KPA, 30KPA
 AK6, AK10
– Surface Mount
 SMAJ, SACB
 SMBJ, SMCJ,
 SMDJ, 5.0SMDJ
 V
BR
– Based Part Numbers
– Axial Leaded
 P4KE, P6KE
 1.5KE,
– Surface Mount
 P4SMA,
 P6SMB, 1KSMB
 1.5SMC
21
Version01_100407

Axial Leaded TVS Diodes
DO-41
Available Axial Packages
DO-15 DO-201 P-600
AK-6 AK-10
22
Version01_100407

DO-41 Axial TVS Diodes
 P4KE (400W)
23
Version01_100407

DO-15 Axial TVS Diodes
 P6KE (600W)
 SA (500W)
 SAC (500W, Low Cap)
TVS Diode
Isolation
Diode
24
Version01_100407

DO-201 Axial TVS Diodes
 1.5KE (1500W)
 LCE (1500W, Low Cap)
25
Version01_100407

P-600 Axial TVS Diodes
 3KP (3000W)
 5KP (5000W)
 15KPA (15000W)
 20KPA (20000W)
 30KPA (30000W)

SLD (2200W - 100x150000 uS Waveform)
26
Version01_100407

AK Series TVS Diodes
 AK6 (6000A – 8x20 uS Waveform)
 AK10 (10000A – 8x20 uS Waveform)
27
Version01_100407

Surface Mount TVS Diodes
Available Surface Mount Packages
DO-214AC
(SMA J-Bend)
DO-214AA
(SMB J-Bend)
DO-214AB
(SMC J-Bend)
28
Version01_100407

SMA Surface Mount TVS Diodes
 SMAJ (400W)
 P4SMA (400W)
29
Version01_100407

SMB Surface Mount TVS Diodes
 SMBJ (600W)
 P6SMB (600W)
 SACB (500W, Low Cap)
 1KSMB (1000W)
30
Version01_100407

SMC Surface Mount TVS Diodes
 SMCJ (1500W)
 1.5SMC (1500W)
 SMDJ (3000W)
 5.0SMDJ (5000W)
31
Version01_100407

Axial TVS Diode Summary
Naming
Convention
Polarity DO-41 DO-15 DO-201 P-600
Vbr P4KE P6KE 1.5KE
Vr
Uni / Bi
SA
3KP
5KP
15KPA
20KPA
30KPA
SLD
Low Cap SAC LCE
AK
AK6
AK10
32
Version01_100407

Surface Mount TVS Diode Summary
Naming
Convention
Polarity SMA SMB SMC
Vbr P4SMA
P6SMB
1KSMB
1.5SMC
Uni / Bi
Vr
SMAJ SMBJ
SMCJ
SMDJ
5.0SMDJ
Low Cap SACB
33
Version01_100407

34
Version01_100407

Question 1: True or False
 The leakage current of a TVS Diode is measured at its breakdown voltage.
FALSE
35
Version01_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
Version01_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 10x1000µS power level indicated on the data sheet.
TRUE
37
Version01_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
Version01_100407

Question 5: True or False
 TVS Diode part numbers always refer to the actual breakdown voltage of the device.
FALSE
39
Version01_100407

Thank You!
40
Version01_100407