SIDACtor Device

Introduction to
SIDACtor®
Overvoltage
Protection Devices
Outline
 Overvoltage Protection
– The race is on
– Clamp vs Crowbar
 Key Parameters
–
–
–
–
–
Vdrm
Vbo
Vs
Holding Current
Surge Current Withstand
 Double Exponential
Waveforms
 Power Cross
Considerations
 Protected Circuit Issues
– Let-through voltage
– Turn-on time
– Capacitance
 Vbo Dependence
 Applied voltage dependence
 Surge Capability dependence
 Configurations
–
–
–
–
Single Devices
SLIC Devices
2-Chip Devices
3-chip “Y” Devices
 Package Options
 Selection Process
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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
–
–
–
–
–
Vdrm
Vbo
Vs
Holding Current
Surge Current Withstand
 Double Exponential
Waveforms
 Power Cross
Considerations
 Protected Circuit Issues
– Let-through voltage
– Turn-on time
– Capacitance
 Vbo Dependence
 Applied voltage dependence
 Surge Capability dependence
 Configurations
–
–
–
–
Single Devices
SLIC Devices
2-Chip Devices
3-chip “Y” Devices
 Package Options
 Selection Process
5
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Key Parameters
Voltage – Current (V-I) Curve
• Voltage is displayed left to right
• Current is displayed up and down
+I
IT
IS
IH
IDRM
-V
+V
VT
-I
VDRM VBO VS
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Key Parameters: VDRM
+I
IT
IS
IH
IDRM
-V
+V
VT
VDRM VBO VS
-I
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Key Parameters: VBO
+I
IT
IS
IH
IDRM
-V
+V
VT
VDRM VBO VS
-I
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Key Parameters: VS
+I
IT
IS
IH
IDRM
-V
+V
VT
VDRM VBO VS
-I
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Key Parameters:
Holding Current (Ih)
+I
IT
IS
IH
IDRM
-V
+V
VT
VDRM VBO VS
-I
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Key Parameters:
Surge Current Withstand
 Double Exponential Waveforms
– Simulate induced lightning events
– Rise time & decay time in microseconds
Transients
Transients
Underground
Line
10 x 1000 10 x 700
8 x 20
10 x 560
2 x 10
5 x 320
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Key Parameters:
Power Cross Events
Accidental contact with power lines
• Construction Accidents
• Traffic Accidents
• Weather-related Accidents
Inductive coupling
• Co-locating telephone cables with
power cables
• Improper grounding
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Version01_100407
Outline
 Overvoltage Protection
– The race is on
– Clamp vs Crowbar
 Key Parameters
–
–
–
–
–
Vdrm
Vbo
Vs
Holding Current
Surge Current Withstand
 Double Exponential
Waveforms
 Power Cross
Considerations
 Protected Circuit Issues
– Let-through voltage
– Turn-on time
– Capacitance
 Vbo Dependence
 Applied voltage dependence
 Surge Capability
dependence
 Configurations
–
–
–
–
Single Devices
SLIC Devices
2-Chip Devices
3-chip “Y” Devices
 Package Options
 Selection Process
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Protected Circuit Issues:
Let-Through Voltage
 Let-through voltage: The peak voltage that the protected
circuit will see in the real application.
 Similar to the datasheet Vs value:
– Vs is defined as the peak voltage measured directly across
the SIDACtor at a particular voltage rate of rise.
 Dependent on:
– Actual incident voltage rate of rise
– Board layout:
 SIDACtor should be as near the entrance to the board as
possible.
 SIDACtor should be “in-line” so that the surge must pass under
the SIDACtor on the way to the protected circuit..
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Protected Circuit Issues:
Turn-On Time
 Turn-On Time
– Time to clamp
– Time to crowbar
– Clamp to crowbar transition time
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Protected Circuit Issues:
Capacitance
Vbo Dependence
80
pF
70
60
50
Capacitance vs Vbo
(C-rated "MC" SIDACtor, 2V Bias)
40
30
20
10
0
0
100
200
Vbo
300
400
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Protected Circuit Issues:
Capacitance
Applied Voltage Dependence
60
Capacitance vs Applied Voltage
(P2600SCMC)
50
pF
40
30
20
10
0
0
10
20
30
40
50
60
Applied Voltage
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Protected Circuit Issues:
Capacitance
Surge Capability Dependence
P2300xx
A
B
C
D
RE
ME
Surge Rating
(8x20)
150
250
400
1000
3000
5000
Capacitance
(pF @ 2V)
30
38
55
65
220
475
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Outline
 Overvoltage Protection
– The race is on
– Clamp vs Crowbar
 Key Parameters
–
–
–
–
–
Vdrm
Vbo
Vs
Holding Current
Surge Current Withstand
 Double Exponential
Waveforms
 Power Cross
Considerations
 Protected Circuit Issues
– Let-through voltage
– Turn-on time
– Capacitance
 Vbo Dependence
 Applied voltage dependence
 Surge Capability dependence
 Configurations
–
–
–
–
Single Devices
SLIC Devices
2-Chip Devices
3-chip “Y” Devices
 Package Options
 Selection Process
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SIDACtor Device Configurations:
Standard Single Devices
 The Original
 Flexible Board Layout
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SIDACtor Device Configurations:
SLIC Single Devices
 SIDACtor Device for
Negative Voltages
 Diode Device for Positive
Voltages
Subscriber
Line
Interface
Circuit
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SIDACtor Device Configurations:
2-Chip Devices
TwinChip
 2-in-1 Packaging
 Matched Chips
TwinSLIC
 2-in-1 Packaging
 1 pkg per port
Broadband Optimized
 Half the capacitance
 Better linearity
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SIDACtor Device Configurations:
3-Chip “Y” Devices
 Lower Capacitance
 Better Capacitance Balance
 Better Voltage Balance
 Better Surge Balance
 3-for-1 Placement Advantage
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SIDACtor Device Configurations:
Tracking Devices




BATTRAX Trademark
Sophisticated SLIC protection
Retains diodes for positive surges
Negative breakdown voltage
determined by reference
 Positive voltage tracking also
available
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SIDACtor Device Configurations:
Bridge Devices
 For Broadband Applications
– And more!
 Patented Bridge Design
 Low Capacitance
 Great Capacitance Balance
 Perfect Voltage Balance
 Perfect Surge Balance
 Biasing provides flat lower and
flatter capacitance
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Version01_100407
Outline
 Overvoltage Protection
– The race is on
– Clamp vs Crowbar
 Key Parameters
–
–
–
–
–
Vdrm
Vbo
Vs
Holding Current
Surge Current Withstand
 Double Exponential
Waveforms
 Power Cross
Considerations
 Protected Circuit Issues
– Let-through voltage
– Turn-on time
– Capacitance
 Vbo Dependence
 Applied voltage dependence
 Surge Capability dependence
 Configurations
–
–
–
–
Single Devices
SLIC Devices
2-Chip Devices
3-chip “Y” Devices
 Package Options
 Selection Process
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SIDACtor Part Numbering
A: ITU K.20 & K.21
B: TIA-968-A
C: GR-1089
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Package Options:
Thru-Hole
G
E
TO-218
M
R
A
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Package Options:
Surface Mount
3x3 QFN
C
S
Q12
3.3x3.3 QFN Q22
U
Q38
5x6 QFN
N
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Version01_100407
Outline
 Overvoltage Protection
– The race is on
– Clamp vs Crowbar
 Key Parameters
–
–
–
–
–
Vdrm
Vbo
Vs
Holding Current
Surge Current Withstand
 Double Exponential
Waveforms
 Power Cross
Considerations
 Protected Circuit Issues
– Let-through voltage
– Turn-on time
– Capacitance
 Vbo Dependence
 Applied voltage dependence
 Surge Capability dependence
 Configurations
–
–
–
–
Single Devices
SLIC Devices
2-Chip Devices
3-chip “Y” Devices
 Package Options
 Selection Process
30
Version01_100407
Selection Methods
 Datasheet Parameters
–
–
–
–
Vdrm, Vbo, Vs
Ih
Surge Current Withstand
Capacitance & Linearity
 Configuration Selection
 Package Selection
Normal
System
Voltages
SIDACtor
Protection
Range
+I
System
Damage
Voltages
IT
IS
IH
IDRM
-V
+V
VT
-I
VDRM V
S
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Thank You!
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