®
FEATURES AND BENEFITS
High Peak pulse power:
■
200 W (10/1000 µs )
1000 W ( 8/20 µs)
Stand-off voltage range 5 to 24V
■
Unidirectional types
■
Low clamping factor V
■
Fast response time
■
1.0mm overall component height
■
CL/VBR
SM2T series
Transient Voltage Suppressor: TRANSIL ™
A
DESCRIPTION
K
The SM2T series are Transil diodes designed specifically
for portable equipment and miniaturized electronics devices subject to ESD transient overvoltages.
Fully compatible with pick and place equipment and
inspectable soldering joints.
DO-216AA
(ST mite)
ABSOLUTE RATINGS (Tamb = 25°C)
Symbol Parameter Value Unit
P
PP
Peak pulse power dissipation (see note 1) Tj initial = Tamb 200 W
P Power dissipation on infinitive heatsink Tamb = 100°C 2.5 W
I
FSM
Non repetitive surge peak forward current tp = 10 ms
25 A
Tj initial = Tamb
T
stg
Tj
Storage temperature range
Maximum operating junction temperature
-65to+175
150
TL Lead solder temperature (10 seconds duration) 260 °C
Note 1: 10/1000µs pulse waveform.
THERMAL RESISTANCES
°C
Symbol Parameter Value Unit
Rth (j-t) Junction to tab 20 °C/W
Rth (j-a) Junction to ambient on PCB with recommended pad layout 250 °C/W
April 2002 - Ed: 1A
1/5
SM2T series
ELECTRICAL CHARACTERISTICS (Tamb = 25°C)
Symbol Parameter
V
RM
V
BR
V
CL
I
RM
I
PP
Stand-off voltage
Breakdown voltage
Clamping voltage
Leakage current @ V
Peak pulse current
RM
VV
CLVBR
V
RM
I
I
F
V
F
I
RM
αT Voltage temperature coefficient
I
PP
Types
I
max@V
RM
RM
VBRmin@I
R
VCLmax@I
Note 1
PP
SM2T6V8A 50µA 5V 6.4V 10 mA 9.2V 19.6A 5.7 1600pF
SM2T14A 1µA 12V 13.3V 1 mA 19.9V 9.0A 8.3 650pF
SM2T18A 1µA 16V 17.1V 1 mA 26V 7A 8.8 500pF
SM2T27A 1µA 24V 25.7V 1 mA 38.9V 4.6A 9.6 350pF
T max
10-4/°C
V
C typ
at 0V
Note 1: 10/1000µs pulse waveform.
Fig. 1: Peak pulse power versus exponential pulse dura-
tion.
P (W)PP
1.E+04
1.E+03
1.E+02
t (ms)P
1.E+01
0.01 0.10 1.00 10.00
Tjinitial = 25°C
Fig. 2: Relativevariation of peak pulse power versus initial
junction temperature.
%
110
100
90
80
70
60
50
40
30
20
10
0
0 25 50 75 100 125 150 175
Tj(°C)
2/5
SM2T series
Fig. 3: Average power dissipation versus ambient tem-
perature.
P(W)
3.0
2.5
2.0
1.5
1.0
0.5
Tamb =Ttab
Printed circuit boardFR4,
recommended pad layout
Tamb(°C)
0.0
0 25 50 75 100 125 150
Fig. 5: Thermal resistance junction to ambient versus
copper surface under tab.
Rth(j-a)(°C/W)
250
200
Fig.4: Variationof thermalimpedance junctionto ambient
versus pulse duration.
Zth(j-a)(°C/W)
1000.0
S=0.135cm²
100.0
S=2cm²
10.0
1.0
t (s)P
0.1
1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
Fig. 6: Reverse leakage current versus junction tempera-
ture (typical values).
I (nA)R
1.E+02
1.E+01
VR=V
RM
150
100
50
S(cm²)
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
Fig.7: Clampingvoltage versuspeak pulsecurrent (maxi-
mum values).
I (A)PP
100.0
8/20µs
10/1000µs
10.0
SM2T6V8A
1.0
0.1
0 5 10 15 20 25 30 35 40 45
SM2T14A
SM2T18A
SM2T27A
Tjinitial =25°C
V (V)CL
1.E+00
1.E-01
Tj(°C)
1.E-02
0 25 50 75 100 125 150
Fig. 8: Junction capacitance versus reverse voltage ap-
plied (typical values).
C(pF)
10000
1000
100
SM2T6V8A
SM2T14A
SM2T18A
V (V)R
10
1 10 100
SM2T27A
V
F=1MHz
osc
Tj=25°C
=30mV
RMS
3/5
SM2T series
Fig. 9: Forward voltagedrop versus forward current (typi-
cal values).
IFM(A)
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
Tj=150°C
Tj=25°C
VFM(V)
PACKAGE MECHANICAL DATA
DO216-AA (ST mite)
L3
b2
C
D
b
H
L2
L
R
A
R1
A1
0° to 6°
DIMENSIONS
REF.
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 0.85 1.00 1.15 0.033 0.039 0.045
A1 0.10 0.004
b 0.40 0.65 0.016 0.025
b2 0.70 1.00 0.027 0.039
c 0.10 0.25 0.004 0.010
E
D 1.75 1.90 2.05 0.069 0.007 0.081
E 1.75 1.90 2.05 0.069 0.007 0.081
H 3.60 3.75 3.90 0.142 0.148 0.154
L 0.50 0.63 0.80 0.047 0.025 0.031
Note: The anode is connected to the longer tab
The cathode is connected to the shorter tab (heatsink)
RECOMMENDED LAYOUT
2.67
0.762
2.54
0.635
4/5
L2 1.20 1.35 1.50 0.047 0.053 0.059
L3 0.50 ref 0.019 ref
R 0.07 0.003
R1 0.07 0.003
1.27
SM2T series
OTHER INFORMATION
Ordering type Marking Package Weight Base qty Delivery mode
SM2T6V8A MUA ST mite 15.5mg 12000 Tape & reel
SM2T14A MUE STmite 15.5 mg 12000 Tape & reel
SM2T18A MUG ST mite 15.5mg 12000 Tape & reel
SM2T27A MUJ ST mite 15.5mg 12000 Tape & reel
Informationfurnished is believedto be accurateandreliable. However, STMicroelectronicsassumes no responsibilityforthe consequences of
useof such informationnor for anyinfringement of patentsor other rightsof third partieswhichmay result fromits use. Nolicense is grantedby
implication or 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 information previously supplied.
STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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