BIDIRECTIONALFUNCTIONWITH VOLTAGE
PROGRAMMABILITYIN BOTH POSITIVEAND
NEGATIVEPOLARITIES.
PROGRAMMABLE BREAKDOWN VOLTAGE
UP TO100 V.
HOLDINGCURRENT = 150mA min.
HIGHSURGE CURRENTCAPABILITY.
IPP= 100A, 10/1000µs
DESCRIPTION
This device has been especially designed to protect a subscriber line interface circuit (SLIC) with
anintegratedring generator.
Used with the recommended application circuit,
eachline(TIPand RING)is protectedagainstpositive and negative surges. In the positive polarity,
the breakdownvoltage is referenced to the + VB ,
andinthe negativepolarity,the breakdownvoltage
isreferencedto the -Vbat .
TM
PROGRAMMABLE TRANSIENT VOLTAGE
SUPPRESSORFOR SLIC PROTECTION
SIP4
SCHEMATIC DIAGRAM
Line
Gate P
Gate N
Itshigh surgecurrentcapabilitymakesthe L3121B
areliableprotectiondevicefor veryexposedequipment,or when series resistorsare very low.
Note 1: Variation ofelectrical parameters is given by curves.
Peak pulse current
Non repetitive surge peak on-state
current
Maximum voltage LINE/GND.
Maximum voltage GATE/LINE.
Storage temperature range
Maximum operating junction temperature
Maximum lead temperature for soldering during 10s
Operating temperature range (see note 1)
10/1000µs
2/10µs
100
250
tp = 10 ms50A
100
80
- 40 to +150
+ 150
260°C
-40to+85°C
-
-
-
-
-
-
A
V
V
°
C
°C
Pulsewaveform10/1000µs
%I
PP
100
50
0
t
r
t
p
THERMAL RESISTANCE
SymbolParameterValueUnit
Junction-to-ambient
2/7
R
th (j-a)
t
80°C/W
Page 3
L3121B
ELECTRICALCHARACTERISTICS
SymbolParameter
V
RM
I
RM
V
BR
V
BO
I
H
I
BO
I
PP
V
GN
I
GN,IGP
C
Stand-off voltage
Reverseleakagecurrent
Breakdown voltage
Breakover voltage
Holding current
Breakover current
Peak pulse current
Gate voltage
Triggeringgate current
Capacitance
1- OPERATIONWITHOUT GATE
I
RM
Type
max.min.max.typ.max.min.max.
(T
@V
amb
RM
=25°C)
VBR@I
R
I
IPP
I
BO
IH
V
BO
@I
BO
I
note1note 1note2
VRM
VBO
VBR
H
C
µAVVmAVmAmAmApF
L3121B
5
8
60
90
2- OPERATIONWITH GATE
@IGN= 200mAIGN@VAC= 60VIGP@VAC= 60V
V
GN
Type
min.max.min.max.max.
VVmAmAmA
L3121B
Note 1 :
See the reference testcircuits for IH,IBOand VBOparameters.
Note 2 :VR= 5 V, F = 1MHz.
0.61.880200180
1001180200500150200
3/7
Page 4
L3121B
REFERENCETEST CIRCUIT FOR IBOand VBOparameters:
tp=20ms
Auto
Transformer
220V/2A
220V
Transformer
220V/800V
5A
TESTPROCEDURE:
PulseTest duration (tp = 20ms):
- For Bidirectionaldevices= SwitchK is closed
- For Unidirectionaldevices= SwitchK isopen.
V
Selection
OUT
- Device with V
-V
- Devicewith V
-V
BO
OUT
BO
OUT
< 200 Volt
= 250V
≥
200 Volt
=480 V
,R1=140 Ω.
RMS
RMS,R2
static
relay.
V
out
= 240 Ω.
K
I,I
BOH
measure
R1
140
R2
240
D.U.T
V
BO
measure
FUNCTIONALHOLDING CURRENT (IH) TEST CIRCUIT= GO- NOGOTEST.
R
D.U.T.
V
= - 48 V
BAT
This isa GO-NOGO Test which allows to confirm the holding current (IH)level in a functionaltest circuit.
This testcan be performed ifthe referencetest circuitcan’t be implemented.
TEST PROCEDURE :
1) Adjust the currentlevel at the IH value by short circuiting the line andGND pinsof the D.U.T.
2) Fire the D.U.T with a surgeCurrent : Ipp = 10A , 10/1000µs.
3) The D.U.T will come back to the OFF-State within a duration of 50 ms max.
Informationfurnishedis believed to be accurateand reliable.However, STMicroelectronics assumes no responsibility for the consequences of
use of suchinformation nor forany infringement of patents or other rights of thirdparties which may result from its use. No license is grantedby
implicationor otherwise under any patent or patent rights of STMicroelectronics.Specifications mentioned in this publication are subject to
change without notice. This publication supersedes and replaces all informationpreviously supplied.
STMicroelectronicsproducts are not authorized foruse as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
1999 STMicroelectronics- Printed in Italy- All rights reserved.
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco -
The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
http://www.st.com
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