Low Capacitance TClamp®
Surge Protection for 12V Interfaces
PROTECTION PRODUCTS
Description
TClamp®1202P provides dedicated surge and ESD
protection for RS-485 and other 12V lines in industrial
applications. It features high surge current capability
of 100A (tp=8/20
μ
s) and low clamping voltage making
them ideal for use in harsh transient environments.
This device is designed to replace mulitple discrete
components by integrating low capacitance, surgerated
compensation diodes with a high power transient
voltage suppressor (TVS). Capacitance is limited to
12pF maximum to ensure correct signal transmission
on high-speed lines. Each TClamp1202P may be used
to protect up to two lines. A voltage bus operating up
to 12V can also be optionally protected.
The TClamp1202P is in a 5-pin SLP2020P5 package,
measuring 2.0 x 2.0mm with a nominal height of
0.60mm. The flow- through package design simplifies
PCB layout.
TClamp1202P
Features
• Transient protection for high-speed data lines to
IEC 61000-4-2 (ESD) 20kV (air), 15kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
IEC 61000-4-5 (Lightning) 100A (8/20μs)
• Array of surge rated diodes with internal TVS Diode
• Protects up to two lines
• Low capacitance: (<12pF)
• Operating voltage: 12V
• Low leakage current
• Solid-state silicon-avalanche technology
Mechanical Characteristics
•
•
•
•
•
•
SLP2020P5 Package
Pb-Free, Halogen Free, RoHS/WEEE Compliant
Lead Finish: NiPdAu
Molding Compound Flammability Rating: UL 94V-0
Marking : Marking code + Date Code
Packaging : Tape and Reel
Applications
•
•
•
•
•
•
•
RS-485 Surge Protection
RS-422 Surge Protection
Industrial Equipment
Remote Meter Readers
Automatic Teller Machines
Digital Surveillance Cameras
CAN-bus
Functional Circuit Diagram
Pin 2
Package Configuration
1
2.00
2
2.00
Pin 1
Pin 3
0.60
Pin 4, 5, Tab
SLP2020P5 (Bottom View)
TClamp1202P
Final Datasheet
Revision date
Rev 5.0
8/24/2016
www.semtech.com
1 of 8
Semtech
Absolute Maximum Rating
Rating
Peak Pulse Power (tp = 10/1000µs), T=25
o
C
Peak Pulse Current (tp = 10/1000µs), T=25
o
C
Peak Pulse Current (tp = 8/20µs), T=25
o
C
ESD per IEC 61000-4-2 (Air)
(2)
ESD per IEC 61000-4-2 (Contact)
(2)
Operating Temperature
Storage Temperature
Symbol
P
PK
I
PP
I
PP
V
ESD
T
J
T
STG
Value
300
12
100
±20
±15
-55 to +125
-55 to +150
Units
W
A
A
kV
O
O
C
C
Electrical Characteristics (T=25
O
C unless otherwise specified)
Parameter
Reverse Stand-Off Voltage
Symbol Conditions
V
RWM
I
t
= 1mA
Pins 1, 2 or 3 to Pins 4, 5 and Tab
4
T = 25
O
C
V
RWM
= 12V
Pins 1, 2 or 3 to Pins 4, 5 and Tab
4
T = 125
O
C
t
p
= 10/1000μs
I = 12A
Pins 1, 2 or 3 to Pins 4, 5 and Tab
4 PP
t
p
= 8/20μs
I = 100A
Pins 1, 2 or 3 to Pins 4, 5 and Tab
4 PP
tp = 0.2/100ns
Pin 1 and 4
V
R
= 0V, f = 1MHz
Pins 1 or 3 to Pins 4, 5 and Tab
4
Min. Typ. Max. Units
12
13.3
15
18.5
0.1
0.5
25
40
0.11
12
V
V
μA
V
V
Ω
pF
Reverse Breakdown Voltage V
BR
Reverse Leakage Current
Clamping Voltage
Clamping Voltage
Dynamic Resistance
2,3
Junction Capacitance
Notes
I
R
V
C
V
C
R
DYN
C
J
1) Measured with a 40dB attenuator, 50 Ohm scope input impedance, 2GHz bandwidth. ESD gun return path connected to ESD ground plane.
2) Transmission Line Pulse Test (TLP) Settings: t
p
= 100ns, t
r
= 0.2ns, I
TLP
and V
TLP
averaging window: t
1
= 70ns to t
2
= 90ns.
3) Dynamic resistance calculated from I
TLP
= 4A to I
TLP
= 16A
4) Pin 4, 5 and center tab are internally connected.
TClamp1202P
Final Datasheet
Revision Date
Rev 5.0
8/24/2016
www.semtech.com
2 of 8
Semtech
Typical Characteristics
Non-Repetitive Peak Pulse Power vs. Pulse Time(VBus Pin1)
100
Capacitance vs. Reverse Voltage (Data Line Pins 1 and 3)
14
12
Junction Capacitance -C
J
(pF)
T
A
= 25
O
C
Peak Pulse Power - P
PP
(kW)
10
10
8
6
4
2
f = 1 MHz
1
DR040412-2000
0.1
0.1
1
10
Pulse Duration - tp (µs)
100
1000
0
0
2
4
6
8
Reverse Voltage -V
R
(V)
10
12
14
Clamping Voltage vs. Peak Pulse Current (t
p
=10/1000μs)
25
Clamping Voltage vs. Peak Pulse Current (tp=8/20μs)
35
20
Clamping Voltage -V
C
(V)
TX/RX (Pins 1 and 3)
30
Clamping Voltage- V
C
(V)
25
20
TX/RX (Pins 1 and 3)
VBus (Pin 2)
15
VBUS (Pin 2)
10
15
10
5
0
0
20
40
60
80
Peak Pulse Current - I
PP
(A)
Waveform
Parameters:
tr = 8µs
td = 20µs
5
0
0
2
4
6
8
Peak Pulse Current -I
PP
(A)
10
Waveform
Parameters:
tr = 10µs
td = 1000µs
12
14
100
120
Forward Voltage vs. Peak Pulse Current (t
p
=8/20μs)
12
10
Forward Voltage - V
F
(V)
8
6
4
2
5
TLP Current (A)
35
30
TX/RX (Pins 1 and 3)
TLP Characteristic (Data Line Pins 1 and 3)
Transimission Line Pulse (TLP)
Settings:
t
p
= 100ns, t
r
=0.2ns,
I
TLP
and V
TLP
averaging window:
t
1
=70ns to t
2
=90ns
25
20
15
10
0
0
20
40
60
80
100
120
0
0
5
10
15
TLP Voltage (V)
20
25
Peak Pulse Current - I
PP
(A)
TClamp1202P
Final Datasheet
Revision Date
Rev 5.0
8/24/2016
www.semtech.com
3 of 8
Semtech
Typical Characteristics (Continued)
140
120
100
Clamping Voltage (V)
80
60
40
20
0
-20
-10
10
30
Time (ns)
50
70
ESD Clamping (8kV Contact per IEC 61000-4-2)
(Data Line Pins 1 and 3)
T
A
= 25
O
C.
Waveform IEC61000-4-2 8kV contact discharge.
Measured with and corrected for 50Ω, 40dB Attenuator.
50Ω
Scope Input Impedance, ≥2GHz
BW.
ESD Gun Return connected to ESD Ground Plane.
40
20
0
Clamping Voltage (V)
-20
-40
-60
-80
-100
-120
ESD Clamping (-8kV Contact per IEC 61000-4-2)
(Data Line Pins 1 and 3)
T
A
= 25
O
C.
Waveform IEC61000-4-2 -8kV contact discharge.
Measured with and corrected for 50Ω, 40dB Attenuator.
50Ω
Scope Input Impedance, ≥2GHz
BW.
ESD Gun Return connected to ESD Ground Plane.
-10
10
30
Time (ns)
50
70
80
70
60
Clamping Voltage (V)
50
40
30
20
10
0
-10
-20
ESD Clamping (8kV Contact per IEC 61000-4-2)
(VBus Pin 2)
T
A
= 25
O
C.
Waveform IEC61000-4-2 8kV contact discharge.
Measured with and corrected for 50Ω, 26dB Attenuator.
50Ω
Scope Input Impedance, ≥2GHz
BW.
ESD Gun Return connected to ESD Ground Plane.
40
20
0
-20
-40
-60
-80
-100
ESD Clamping (-8kV Contact per IEC 61000-4-2)
(VBus Pin 2)
Clamping Voltage (V)
T
A
= 25
O
C.
Waveform IEC61000-4-2 -8kV contact discharge.
Measured with and corrected for 50Ω, 26dB Attenuator.
50Ω
Scope Input Impedance, ≥2GHz
BW.
ESD Gun Return connected to ESD Ground Plane.
-10
10
30
Time (ns)
50
70
-10
10
30
Time (ns)
50
70
6
Typical Insertion Loss S21
(Data Line Pins 1 and 3)
0
-10
Analog Crosstalk
(Pin1 to 3)
0
Insertion Loss (dB)
-20
-30
-6
-12
-18
-24
1.E+06
Insertion Loss (dB)
-40
-50
-60
-70
-80
-90
1.E+07
1.E+08
Frequency (Hz)
1.E+09
-100
1.E+06
1.E+07
1.E+08
Frequency (GHz)
1.E+09
TClamp1202P
Final Datasheet
Revision Date
Rev 5.0
8/24/2016
www.semtech.com
4 of 8
Semtech
Application Information
Device Connection for Protection of RS-485
Interfaces
EIA RS-485 specifies a ±7V ground difference between
devices on the bus. This permits the bus voltage to
range from +12V (5V + 7V) to -7V (0 - 7V).
Because of this requirement, each TClamp1202P can
be configured to protect one line for common mode
surges or one line pair for differential surges.
The example below illustrates how to connect the
TClamp1202P for common mode and differential
mode protection on an RS-485 interface. For common
mode protection, one of the TClamp1202P data pins
(pin 1 or 3) is connected to the TX/RX line and the
other is connected to ground. Pins 4 and 5 as well as
the center tab are not connected. This effectively
makes the device look like a bidirectional 12V TVS to
the circuit. For differential mode protection, each of
the device data pins (1 and 3) are connected to the
transceiver RX/TX pins as shown. Again, Pins 4, 5 and
the center tab are not connected.
Receiver
TClamp1202P
TClamp1202P
R
Driver
TClamp1202P
RS-485 Common Mode and Differential Mode Surge Protection
TClamp1202P
Final Datasheet
Revision Date
Rev 5.0
8/24/2016
www.semtech.com
5 of 8
Semtech
京公网安备 11010802033920号
EEWORLD
