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SM2T18A-SM2T27A
TRANSIENT VOLTAGE SUPPRESSOR: TRANSIL
SM2T seriesTransient Voltage Suppressor: TRANSIL ™
The SM2T seriesare Transil diodes designed specifically
for portable equipment and miniaturized electronics de-
vices subjectto ESD transient overvoltages.
Fully compatible with pick and place equipment and
inspectable soldering joints.
DESCRIPTION
Note1: 10/1000μs pulse waveform.
ABSOLUTE RATINGS (Tamb= 25°C) High Peak pulse power:200W (10/1000μs)
1000W( 8/20μs) Stand-off voltage range5to 24V Unidirectional types Low clamping factor VCL/VBR Fast response time 1.0mm overall component height
FEATURES AND BENEFITS
THERMAL RESISTANCES
SM2T series
Note1: 10/1000μs pulse waveform.
1.E+01
1.E+02
1.E+03
1.E+04
0.01 0.10 1.00 10.00 (W)PP
Fig.1: Peak pulse power versus exponential pulse dura-
tion.
110 25 50 75 100 125 150 175
Fig.2: Relative variationof peak pulse power versus initial
junction temperature.
ELECTRICAL CHARACTERISTICS (Tamb= 25°C)
SM2T series
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02 25 50 75 100 125 150 (nA)R
Fig.6: Reverse leakage current versus junction tempera-
ture (typical values).
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
Rth(j-a)(°C/W)
Fig.5: Thermal resistance junctionto ambient versus
copper surface under tab.
100.0 5 10 15 20 25 30 35 40 45 (A)PP
Fig.7: Clampingvoltageversus peak pulse current (maxi-
mum values).
10000 10 100
C(pF)
Fig.8: Junction capacitance versus reverse voltage ap-
plied (typical values).
3.0 25 50 75 100 125 150
P(W)
Fig.3: Average power dissipation versus ambient tem-
perature.
1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
Zth(j-a)(°C/W)
Fig.4: Variationof thermal impedance junctiontoambient
versus pulse duration.
SM2T series
PACKAGE MECHANICAL DATADO216-AA (ST mite)
RECOMMENDED LAYOUT
1.E-02
1.E-01
1.E+00
1.E+01
1.E+02
0.0 0.5 1.0 1.5 2.0 2.5 3.0
IFM(A)
Fig.9: Forward voltage drop versus forward current (typi-
cal values).
SM2T seriesInformation furnishedis believedtobeaccurateandreliable.However,STMicroelectronics assumesnoresponsibility fortheconsequencesof
useofsuchinformationnorfor anyinfringementofpatentsorother rightsof third parties which mayresultfromits use.No licenseis grantedby
implicationor otherwise underany patentor patent rightsof STMicroelectronics. Specifications mentionedinthis publicationare subjectto
change without notice. This publication supersedes and replacesall information previously supplied.
STMicroelectronics productsarenot authorizedforuseas critical componentsinlife support devicesor systems without express writtenap-
provalof STMicroelectronics.
TheST logoisa registered trademarkof STMicroelectronics 2002 STMicroelectronics- Printedin Italy-All rights reserved.
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