L3121B ,PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR®L3121BApplication Specific DiscretesPROGRAMMABLE TRANSIENT VOLTAGETMSUPPRESSOR FOR SLIC PROTECTION ..
L3121B ,PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSORFEATURESBIDIRECTIONAL FUNCTION WITH VOLTAGEPROGRAMMABILITY IN BOTH POSITIVE ANDNEGATIVE POLARITIES. ..
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L3121B
PROGRAMMABLE TRANSIENT VOLTAGE SUPPRESSOR
L3121BMay 1999 - Ed:4A
PROGRAMMABLE TRANSIENT VOLTAGE
SUPPRESSOR FOR SLIC PROTECTION
Application Specific Discretes
A.S.D.TM
BIDIRECTIONAL FUNCTION WITH VOLTAGE
PROGRAMMABILITY IN BOTH POSITIVE AND
NEGATIVE POLARITIES.
PROGRAMMABLE BREAKDOWN VOLTAGE
UP TO 100 V.
HOLDING CURRENT = 150 mA min.
HIGH SURGE CURRENT CAPABILITY.
IPP = 100A , 10/1000 μs
FEATURESThis device has been especially designed to pro-
tect a subscriber line interface circuit (SLIC) with
an integrated ring generator.
Used with the recommended application circuit,
each line (TIP and RING) is protected against posi-
tive and negative surges. In the positive polarity,
the breakdown voltage is referenced to the + VB ,
and in the negative polarity, the breakdown voltage
is referenced to the -Vbat .
Its high surge current capability makes the L3121B
a reliable protection device for very exposed equip-
ment, or when series resistors are very low.
DESCRIPTION
CONNECTION DIAGRAM
SCHEMATIC DIAGRAM1/7
Note 1: Variation of electrical parameters is given by curves.
ABSOLUTE MAXIMUM RATINGS (Tamb = 25°C)%IPP ttr p0
Pulse waveform 10/1000μs
THERMAL RESISTANCE
L3121B2/7
ELECTRICAL CHARACTERISTICS (Tamb = 25 °C)
1- OPERATION WITHOUT GATE
2- OPERATION WITH GATE
Note 1 :See the reference test circuits for IH, IBO and VBO parameters.
Note 2 :VR = 5 V, F = 1MHz.
L3121B3/7
REFERENCE TEST CIRCUIT FOR IBO and VBO parameters :
FUNCTIONAL HOLDING CURRENT (IH) TEST CIRCUIT = GO - NOGO TEST.
L3121B4/7
1E-2 1E-1 1E+0 1E+1 1E+2 1E+30
(A)TSM
Fig. 1: Surge peak current versus overload
duration (typical values).
V[T ] [T = 25°C] amb amb
-40 -20 0 20 40 60 80
Fig. 3: Typical relative variation of breakdown
voltage versus ambient temperature.
Fig. 4: Junction capacitance versus reverse
applied voltage.
-40 -20 0 20 40 60 80850.70
I[T][T = 25°C]
Hamb
Hamb
Fig. 2: Typical relative variation of holding currentversus ambient temperature. 50 75 100 1251E+0
1E+1
1E+2
1E+3
1E+4
1E+5
IR[Tj] / IR [Tj=25°C]
Fig. 5: Typical relative variation of leakage currentversus ambient temperature.
-40 -30 -20 -100 10203040 5060 70800.90
Ipp[Tamb] / Ipp [25°C]
Fig. 6: Typical relative variation of peak pulse
current (10/1000μs) versus ambient temperature.
L3121B5/7
Typical Slic Protection Concept.
MARKING : Logo, Date Code, Part Number
ORDER CODE
L3121B6/7
