1
www.semtech.com
RClamp1502B
Ultra-Low Capacitance TVS
for ESD and CDE Protection
PROTECTION PRODUCTS - RailClamp
®®
®®
®
Description
Features
Dimensions Schematic & PIN Configuration
Revision 2/3/2009
RailClamps are ultra low capacitance TVS arrays
designed to protect high speed data interfaces. This
series has been specifically designed to protect sensi-
tive components which are connected to high-speed
data and transmission lines from overvoltage caused
by ESD (electrostatic discharge), CDE (Cable Discharge
Events), and EFT (electrical fast transients).
The RClamp
TM
1502B has a typical capacitance of only
0.60pF (pin 1 to 2). This means it can be used on
circuits operating in excess of 3GHz without signal
attenuation. They may be used to meet the ESD
immunity requirements of IEC 61000-4-2, Level 4
(±15kV air, ±8kV contact discharge). Each device can
be configured to protect 1 bidirectional line or two
unidirectional lines.
These devices are in a small SC-75 (SOT-523) package
and feature a lead-free, matte tin finish. They are com-
patible with both lead free and SnPb assembly tech-
niques. They are designed for use in applications where
board space is at a premium. The combination of small
size, low capacitance, and high level of ESD protection
makes them a flexible solution for applications such as
Automatic Test Equipment and Infiniband circuits.
Applications
Mechanical Characteristics
Automatic Test Equipment
Firewire Ports
GaAs Photodetector Protection
HBT Power Amp Protection
Infiniband Transceiver Protection
Transient protection for high-speed data lines to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
Designed to replace polymer TVS
Protects up to two I/O lines
Ultra-Low capacitance (<1pF)
No insertion loss to
>3.0GHz>3.0GHz
>3.0GHz>3.0GHz
>3.0GHz
Low profile (<1mm)
Low leakage current and clamping voltage
Low operating voltage: 15.0V
Solid-state silicon-avalanche technology
SC-75 (SOT-523) package
Lead Finish: Matte Tin
RoHS/WEEE Compliant
Molding compound flammability rating: UL 94V-0
Marking: P6
Packaging: Tape and Reel
SC-75 3L (Top View)
12
3
1.60
1.60
1.00
BSC
0.50 BSC
0.75
0.80
Nominal Dimensions (mm)
