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PDF TISP83121D Data sheet ( Hoja de datos )
| Número de pieza | TISP83121D | |
| Descripción | Unidirectional P & N-Gate Protector | |
| Fabricantes | BOURNS | |
| Logotipo |  |
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TISP83121D
DUAL-GATE UNIDIRECTIONAL OVERVOLTAGE PROTECTOR
TISP83121D Unidirectional P & N-Gate Protector
Overvoltage Protection for Dual-Voltage Ringing SLICs
– Programmable Protection Configurations up to ±100 V
– Typically 5 Lines Protected by:
Two TISP83121D + Diode Steering Networks
High Surge Current
– 150 A, 10/1000 µs
– 250 A, 10/700 µs
– 500 A, 8/20 µs
Pin Compatible with the LCP3121
– 50 % more surge current
– Functional Replacement in Diode Steering Applications
Small Outline Surface Mount Package
Description
The TISP83121D is a dual-gate reverse-blocking unidirectional
thyristor designed for the protection of dual-voltage ringing SLICs
(Subscriber Line Interface Circuits) against overvoltages on the
telephone line caused by lightning, a.c. power contact and
induction.
8-SOIC Package (Top View)
K1
G1 2
8K
7A
G2 3
K4
6A
5K
MD6XAYB
For operation at the rated current values connect pins 1, 4, 5
and 8 together.
Device Symbol
A
G2
The device chip is a four-layer NPNP silicon thyristor structure
which has an electrode connection to every layer. For negative
overvoltage protection the TISP83121D is used in a common anode
configuration with the voltage to be limited applied to the cathode
(K) terminal and the negative reference potential applied to the gate
1 (G1) terminal. For positive overvoltage protection the TISP83121D
is used in a common cathode configuration with the voltage to be
limited applied to the anode (A) terminal and the positive reference
potential applied to the gate 2 (G2) terminal.
G1
K SD6XAKA
............................................... UL Recognized Component
The TISP83121D is a unidirectional protector and to prevent reverse bias, requires the use of a series diode between the protected line
conductor and the protector. Further, the gate reference supply voltage requires an appropriately poled series diode to prevent the supply from
being shorted when the TISP83121D crowbars.
Under low level power cross conditions the TISP83121D gate current will charge the gate reference supply. If the reference supply cannot
absorb the charging current its potential will increase, possibly to damaging levels. To avoid excessive voltage levels a clamp (zener or
avalanche breakdown diode) may be added in shunt with the supply. Alternatively, a grounded collector emitter-follower may be used to
reduce the charging current by the transistor’s HFE value.
This monolithic protection device is made with an ion-implanted epitaxial-planar technology to give a consistent protection performance and
be virtually transparent to the system in normal operation.
How To Order
Device
Package
Carrier
Order As
TISP83121 D (8-pin Small-Outline) R (Embossed Tape Reeled) TISP83121DR-S
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
FEBRUARY 1999 – REVISED JULY 2008
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
1 page  
TISP83121D Unidirectional P & N-Gate Protector
Battery Supply Impedance
In many designs, the battery supply voltages are generated by switching mode power supplies. This type of power supply cannot be charged
like a battery. Feeding a charging current to a switching mode power supply will usually cause the supply to stop switching and the voltage to
rise. The gate current of the TISP83121D is a charging current for the supply. To avoid the supply voltage from rising and damaging the
connected SLICs, an avalanche diode voltage clamp can be connected across the supply (Figure 3. (A)).
Another approach is to reduce the gate charging current for the supply by a transistor buffer (Figure 3. (B)). If the transistor gain was 50, a
200 mA gate current would be reduced to a supply charging current of 200/50 = 4 mA. In both cases, the dissipation in the control devices can
be substantial and power capability needs to be taken into account in device selection.
A
G2
+VE
REFERENCE
VOLTAGE
+VBAT
G1
TISP83121D
K
A
TISP83121D
G2
0
G1
K
-VE
REFERENCE
VOLTAGE
(A)
-VBAT
A
G2
G1
TISP83121D
K
A
G2 TISP83121D
G1
K
+VE
REFERENCE
VOLTAGE
+VBAT
0
-VE
-VBAT
REFERENCE
VOLTAGE AI8XAB
(B)
Figure 3. Reference Voltage Control by (A) Breakdown Diodes or (B) by Transistor Buffers
“TISP” is a trademark of Bourns, Ltd., a Bourns Company, and is Registered in U.S. Patent and Trademark Office.
“Bourns” is a registered trademark of Bourns, Inc. in the U.S. and other countries.
FEBRUARY 1999 – REVISED JULY 2008
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet TISP83121D.PDF ] | |
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