Transcript Surface Mount TVS Diodes

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





P4KE, SA, SAC, P6KE
1.5KE, LCE
3KP, 5KP, SLD
15KPA, 20KPA, 30KPA
AK6, AK10
– Unidirectional vs Bidirectional
– Peak Pulse Power PPPM
– Double Exponential Waveforms
– Reverse Stand-Off Voltage VR
– Breakdown Voltage VBR
– Surface Mount
– Clampin Voltage VC
 SMAJ, P4SMA, SACB
– Peak Pulse Current IPP
 SMBJ, P6SMB, 1KSMB
 SMCJ, 1.5SMC
 SMDJ, 5.0SMDJ
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The Race is On!
Overvoltage
Protector
Protected
Circuit
Overvoltage Event
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Clamping Devices vs Crowbar Devices
Transient Event
Vline
Clamping Devices
Vline
Clamp Voltage
Crowbar Devices
Trigger Voltage
Vline
Delatch
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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
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Key Parameters: Peak Pulse Power
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Key Parameters: Peak Pulse Power
 Double Exponential Waveforms
– Simulate induced lightning events
– Rise time & decay time in microseconds
Transients
Transients
Underground
Line
10 x 1000
8 x 20
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Bidirectional vs Unidirectional
Bidirectional TVS
Unidirectional TVS
+I
+I
IPP
IPP
-V
IR
IT
+V -V
IR
IT
+V
VR VBR VC
-I
VR VBR VC
-I
Voltage – Current (V-I) Curve
• Voltage is displayed left to right
• Current is displayed up and down
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Key Parameters: VR
+I
IPP
-V
IR
IT
+V
VR VBR VC
Reverse Standoff Voltage
-I
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Key Parameters: VBR
+I
IPP
-V
IR
IT
+V
VR VBR VC
Breakdown Voltage
-I
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Key Parameters: VC
+I
IPP
-V
IR
IT
+V
VR VBR VC
Max Clamping Voltage
-I
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Key Parameters: Ipp
+I
Peak Pulse Current
IPP
-V
IR
IT
+V
VR VBR VC
-I
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Question 1: True or False
 A TVS Diode is intended to provide continuous
voltage regulation to a circuit.
FALSE
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Question 2: True or False
 A TVS Diode is a crowbar type of device that
brings the protected line close to ground potential.
FALSE
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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
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Question 4: True or False
 A bidirectional TVS Diode can be used on a DC line.
TRUE
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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
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Outline
 Overvoltage Protection
 Product Families
– Part Number Conventions
– Axial Leaded
– P4KE, SA, SAC, P6KE
 Key Parameters
– 1.5KE, LCE
– Unidirectional vs Bidirectional
– 3KP, 5KP, SLD
– Peak Pulse Power PPPM
– 15KPA, 20KPA, 30KPA
– Double Exponential Waveforms
– AK6, AK10
– Surface Mount
– Reverse Stand-Off Voltage VR
– SMAJ, P4SMA, SACB
– Breakdown Voltage VBR
– SMBJ, P6SMB, 1KSMB
– Clamping Voltage VC
– SMCJ, 1.5SMC
– Peak Pulse Current IPP
– SMDJ, 5.0SMDJ
– The race is on
– Clamp vs Crowbar
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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.
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Part Numbering Conventions
 VR – 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
 VBR – Based Part Numbers
– Axial Leaded
 P4KE, P6KE
 1.5KE,
– Surface Mount
 P4SMA,
 P6SMB, 1KSMB
 1.5SMC
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Axial Leaded TVS Diodes
Available Axial Packages
DO-41
DO-15
AK-6
DO-201
P-600
AK-10
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DO-41 Axial TVS Diodes
 P4KE (400W)
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DO-15 Axial TVS Diodes
 P6KE (600W)
 SA (500W)
 SAC (500W, Low Cap)
TVS Diode
Isolation
Diode
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DO-201 Axial TVS Diodes
 1.5KE (1500W)
 LCE (1500W, Low Cap)
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P-600 Axial TVS Diodes
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3KP (3000W)
5KP (5000W)
15KPA (15000W)
20KPA (20000W)
30KPA (30000W)
SLD (2200W - 100x150000 uS Waveform)
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AK Series TVS Diodes
 AK6 (6000A – 8x20 uS Waveform)
 AK10 (10000A – 8x20 uS Waveform)
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Surface Mount TVS Diodes
Available Surface Mount Packages
DO-214AC
(SMA J-Bend)
DO-214AA
(SMB J-Bend)
DO-214AB
(SMC J-Bend)
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SMA Surface Mount TVS Diodes
 SMAJ (400W)
 P4SMA (400W)
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SMB Surface Mount TVS Diodes

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SMBJ (600W)
P6SMB (600W)
SACB (500W, Low Cap)
1KSMB (1000W)
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SMC Surface Mount TVS Diodes
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SMCJ (1500W)
1.5SMC (1500W)
SMDJ (3000W)
5.0SMDJ (5000W)
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Axial TVS Diode Summary
Littelfuse Axial TVS Diodes
Naming
Convention
Polarity
Vbr
DO-41
DO-15
DO-201
P4KE
P6KE
1.5KE
Uni / Bi
SA
Vr
Low Cap
SAC
P-600
AK
3KP
5KP
15KPA
20KPA
30KPA
SLD
AK6
AK10
LCE
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Surface Mount TVS Diode Summary
Littelfuse Surface Mount TVS Diodes
Naming
Convention
Polarity
Vbr
SMA
SMB
SMC
P4SMA
P6SMB
1KSMB
1.5SMC
SMBJ
SMCJ
SMDJ
5.0SMDJ
Uni / Bi
SMAJ
Vr
Low Cap
SACB
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Question 1: True or False
 The leakage current of a TVS Diode is measured
at its breakdown voltage.
FALSE
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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
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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
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Question 4: True or False
 The AK series of TVS Diodes can handle a million
watts of power during a transient event.
TRUE
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Question 5: True or False
 TVS Diode part numbers always refer to the
actual breakdown voltage of the device.
FALSE
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Introduction to TVS
Overvoltage Protection Devices
Thank You!
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