August 2006 Rev 10 1/9
9
USB6B1
Data line protection
Applications
Where transient overvoltage protection in
sensitive equipment is required, such as:
■ Universal Serial Bus ports
■ RS-423 interfaces
■ RS-485 interfaces
■ ISDN equipment
■ T1/E1 line cards
■ HDSL / ASDL interfaces
Features
■ Full diode bridge with integrated clamping
protection
■ Breakdown voltage: V
BR
= 6 V min.
■ Peak pulse power dissipation: P
PP
= 500 W
(8/20 µs)
■ Very low capacitance, compatible with high
debit data or signal rates.
Description
In order to prevent fast transients from leading to
severe damages in a high speed data system, a
specific protection has been developed by
STMicroelectronics.
The USB6B1 protects the two input lines against
overvoltage. Besides, this device also keeps the
power rails in a safe limit thanks to the integrated
Transil diode.
Benefits
■ Provides protection for each line and between
the supply voltage and GND: 25 A, 8/20 µs.
■ High ESD protection level: up to level 3 per MIL
STD 883C-Method 3015-6
■ Separated inputs and outputs (so-called 4-point
structure) to improve ESD susceptibility.
■ Comprehensive package pin-out for immediate
implementation.
Order Codes
Functional diagram
Complies with the following standards:
Part Numbers Marking
USB6B1 USB62
USB6B1RL USB62
MIL STD 883C - Method 3015-6
class 3 C = 100 pF R = 1500 Ω
3 positive strikes and 3 negative strikes (F = 1 Hz)
IEC 61000-4-2 level 4
15 kV (air discharge)
8 kV (contact discharge)
SO-8
V
CC
V
CC
I/O1I/O1
I/O2I/O2
GNDGND
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