SSRP105B1 STMicroelectronics, SSRP105B1 Datasheet - Page 2

• Manufacturer Part Number: SSRP105B1
• Description: IC OVP TELECOM LINE DUAL 8SOIC
• Manufacturer: STMicroelectronics

Specifications of SSRP105B1

• Technology: Mixed Technology
• Number Of Circuits: 2
• Applications: Telecommunications
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power (watts): -
• Voltage - Working: -
• Voltage - Clamping: -
• Other names: 497-4303-5

SSRP105B1
APPLICATION INFORMATION
Fig. 1: Topology of the classical line card protection.
The classical line card requires protection before the
ring relay and a second one for the SLIC ( figure 1 ).
The use of new SLICs with integrated ring
generator or board based on solid-state ring relay
suppresses this second protection ( figure 2 ).
Then, the only remaining stage, located between
the line and the ring relay, has to optimize the
protection.
The classical symmetrical first stage protector
becomes not sufficient to avoid any circuit
destruction during surges.
Fig. 3: SSRP105B1 electrical characteristics.
In addition with the 2 crowbar functions which
perform the protection of both TIP and RING lines
versus ground, a third cell assumes the differential
mode protection of the SLIC. The breakover
voltage values of this third cell are the same for
2/6
LINE
a: Line to ground characteristics.
PTC
PTC
V
stage
BO-
1st
V
± V
RINGBAT
I
RING
stage
2nd
Ring generator
V
R
R
BO+
TIP
RING
SLIC
V
Fig. 2: Classical use of the SSRP105B1.
shifted
SSRP105B1 negative breakover value V
greater than the positive one V
both
characteristics and are equivalent to the negative
breakover voltage value of the TIP and RING lines
versus GND cells ( figure 3b ).
The SSRP105B1 device takes into account this
fact and is based on asymmetrical voltage
characteristics ( figure 3a ). The ring signal being
guarantees a protection operation very close to the
peak of the normal operating voltage without any
disturbance of the ring signal.
(*) SLIC with integrated ring generator or Solid-State Relay
PTC
PTC
positive
back
b: Line to line characteristics.
V
by
BO-
and
SSRP105B1
the
I
negative
battery
R
R
V
BO+
BO+
parts
voltage,
TIP
RING
. This point
SLIC
of
V
BO-
(*)
the
the
is