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PDF TCLAMP1202P Data sheet ( Hoja de datos )
| Número de pieza | TCLAMP1202P | |
| Descripción | Surge Protection | |
| Fabricantes | Semtech | |
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TClamp1202P
Low Capacitance TClamp®
Surge Protection for 12V Interfaces
PROTECTION PRODUCTS - TransClamp®
PRELIMINARY
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=8/20us) 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, surge-
rated 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.
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
Pin 1
Pin 3
12V
Package Configuration
2.00
12
2.00
Revision 5/27/2015
Pin 4, 5, Tab
0.60
Nominal Dimensions in mm (Bottom View)
1 www.semtech.com
1 page  
TClamp1202P
PROTECTION PRODUCTS
PRELIMINARY
Applications Information
Device Connection for Protection of RS-485 Inter-
faces
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.
TClamp1202P
Receiver
TClamp1202P
R Driver
TClamp1202P
RS-485 Common Mode and Differential Surge Protection
© 2015 Semtech Corporation
5
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