SRDA70-4.TBT Semtech, SRDA70-4.TBT Datasheet - Page 4

• Manufacturer Part Number: SRDA70-4.TBT
• Description: 70V 24A LOW CAP RAILCLAMP TVS DIODE ARRAY, 4 LINES / LEAD-FREE, AND WEEE C
• Manufacturer: Semtech

Specifications of SRDA70-4.TBT

• Rohs Compliant: YES
• Lead Free Status / Rohs Status: Compliant

Device Connection Options for Protection of Four
High-Speed Data Lines
The SRDA70-4 TVS is designed to protect four data
lines from transient over-voltages by clamping them to
a fixed reference. When the voltage on the protected
line exceeds the reference voltage (plus diode V
steering diodes are forward biased, conducting the
transient current away from the sensitive circuitry.
Data lines are connected at pins 1, 4, 6 and 7. The
negative reference (REF2) is connected at pins 5 and
8. These pins should be connected directly to a ground
plane on the board for best results. The path length is
kept as short as possible to minimize parasitic induc-
tance.
The positive reference (REF1) is connected at pins 2
and 3. The options for connecting the positive refer-
ence are as follows:
1. To protect data lines and the power line, connect
2. The SRDA70-4 can be isolated from the power
3. In applications where no positive supply reference
PROTECTION PRODUCTS
PROTECTION PRODUCTS
Applications Information
2006 Semtech Corp.
pins 2 and 3 directly to the positive supply rail (V
In this configuration the data lines are referenced
to the supply voltage. An external TVS diode may
be added between the supply rail and ground in
order to prevent over-voltage on the supply rail.
supply by adding a series resistor between pins 2
and 3 and V
The internal steering diodes remain biased, provid-
ing the advantage of lower capacitance.
is available, or complete supply isolation is desired,
an external TVS diode may be used as the refer-
ence. The steering diodes will begin to conduct
when the voltage on the protected line exceeds the
working voltage of the TVS (plus one diode drop).
CC
. A value of 10k
is recommended.
F
) the
CC
).
4
Matte Tin Lead Finish
Matte tin has become the industry standard lead-free
replacement for SnPb lead finishes. A matte tin finish
is composed of 100% tin solder with large grains.
Since the solder volume on the leads is small com-
pared to the solder paste volume that is placed on the
land pattern of the PCB, the reflow profile will be
determined by the requirements of the solder paste.
Therefore, these devices are compatible with both
lead-free and SnPb assembly techniques. In addition,
unlike other lead-free compositions, matte tin does not
have any added alloys that can cause degradation of
the solder joint.
Microcontroller Protection
I/O Protection
SRDA70-4
SRDA70-4
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