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SM15T
TRANSILTM
Features

Peak pulse power: 1500 W (10/1000 s) Breakdown voltage range: from 6.8 V to 220 V Uni and bidirectional types Low clamping factor Fast response time UL recognized
A
K
Unidirectional Bidirectional
SMC (JEDEC DO-214AB)
Description
Transil diodes provide high overvoltage protection by clamping action. Their instantaneous response to transient overvoltages makes them particularly suited to protect voltage sensitive devices such as MOS Technology and low voltage supplied IC's.
Order code
Part number SM15TxxxA SM15TxxxCA Marking See Table 5 on page 7 See Table 5 on page 7
Table 1.
Symbol PPP P IFSM Tstg Tj TL
Absolute maximum ratings (Tamb = 25 C)
Parameter Peak pulse power dissipation(1) Tj initial = Tamb Tamb = 50 C tp = 10ms Tj initial = Tamb Value 1500 6.5 200 -65 to + 175 150 260 Unit W W A C C C
Power dissipation on infinite heatsink Non repetitive surge peak forward current for unidirectional types Storage temperature range Maximum operating junction temperature Maximum lead temperature for soldering during 10 s.
1. For a surge greater than the maximum values, the diode will fail in short-circuit.
Table 2.
Symbol Rth(j-l) Rth(j-a)
Thermal parameter
Parameter Junction to leads Junction to ambient on printed circuit on recommended pad layout Value 15 75 Unit C/W C/W
TM: TRANSIL is a trademark of STMicroelectronics
February 2007
Rev 4
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www.st.com 9
Characteristics
SM15T
1
Table 3.
Symbol VBR IRM VRM VCL Rd T IPP
Characteristics
Electrical characteristics
Parameter
I
I IPP
Breakdown voltage Leakage current @ VRM Stand-off voltage
VCL VBR VRM
Unidirectional
IF
VF IRM IR
V
VCLVBR VRM
Clamping voltage Dynamic impedance Voltage temperature coefficient Peak pulse current
IR IRM IRM IR
V VRMVBR VCL
IPP
IPP
Bidirectional
IRM @ VRM Type max min
SM15T6V8A/CA SM15T7V5A/CA SM15T10A/CA SM15T12A/CA SM15T15A/CA SM15T18A/CA SM15T22A/CA SM15T24A/CA SM15T27A/CA SM15T30A/CA SM15T33A/CA SM15T36A/CA SM15T39A/CA SM15T68A/CA SM15T75A/CA SM15T100A/CA SM15T150A/CA SM15T200A/CA SM15T220A/CA A 1000 500 10 5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 V 5.8 6.4 8.55 10.2 12.8 15.3 18.8 20.5 23.1 25.6 28.2 30.8 33.3 58.1 64.1 85.5 128 171 188 V 6.45 7.13 9.5 11.4 14.3 17.1 20.9 22.8 25.7 28.5 31.4 34.2 37.1 64.6 71.3 95.0 143 190 209
VBR @ IR(1) nom
V 6.8 7.5 10 12 15 18 22 24 27 30 33 36 39 68 --100 150 200 220
VCL @ IPP 10/1000 s max
mA 10 10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 V 10.5 11.3 14.5 16.7 21.2 25.2 30.6 33.2 37.5 41.5 45.7 49.9 53.9 92 103 137 207 274 328 A 143 132 103 90 71 59.5 49 45 40 36 33 30 28 16.3 14.6 11 7.2 5.5 4.6
%IPP 100
VCL @ IPP 8/20 s max
V 13.4 14.5 18.6 21.7 27.2 32.5 39.3 42.8 48.3 53.5 59.0 64.3 69.7 121 134 178 265 353 388 A 746 690 538 461 368 308 254 234 207 187 169 156 143 83 75 56 38 28 26
10 s
T max(2)
10-4/C 5.7 6.1 7.3 7.8 8.4 8.8 9.2 9.4 9.6 9.7 9.8 9.9 10.0 10.4 10.5 10.6 10.8 10.8 10.8
C typ(3)
pF 9500 8500 7000 6000 5000 4300 3700 3500 3200 2900 2700 2500 2400 1550 1450 1150 850 675 625
max
V 7.14 7.88 10.5 12.6 15.8 18.9 23.1 25.2 28.4 31.5 34.7 37.8 41.0 71.4 78.8 105 158 210 231
1. Pulse test: tp < 50 ms. 2. VBR = T * (Tamb - 25) * VBR (25C) 3. VR = 0 V, F = 1 MHz. For bidirectional types capacitance value is divided by 2.
Pulse waveform 10/1000s 50
0 1000 s
t
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SM15T
Characteristics
Figure 1.
Peak pulse power dissipation versus initial junction temperature (printed circuit board)
Figure 2.
Peak pulse power versus exponential pulse duration
%
100.0
PPP (kW)
100
80
10.0
60
40
1.0
20
Tj initial (C)
0 0 20 40 60 80 100 120 140 160 180 200
0.1 1.E-03 1.E-02
o
tp (ms)
1.E-01 1.E+00 1.E+01
Figure 3.
Clamping voltage versus peak pulse current Exponential waveform tp = 20 ms tp = 1 ms------------ tp = 10 ms...............
VCL (V)
1000
100 50 %IPP
Tj initial = 25C
SM15T 220A
0
SM15T 150A
tr
tp
tr < 10 S
t
100
SM15T 68A SM15T 39A SM15T 22A
SM15T 10A
10
SM15T 6V8A
IPP (A)
1 0.1
Note:
1
10
100
1000
The curves of figure 3 are specified for a junction temperature of 25 C before surge. The given results may be extrapolated for other junction temperatures by using the following formula: VBR = T * [Tamb -25] * VBR (25 C) For intermediate voltages, extrapolate the given results.
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Characteristics
SM15T
Figure 4.
Capacitance versus reverse applied Figure 5. voltage for unidirectional types (typical values)
10000
SM15T 6V8A SM15T 15A Tj = 25C F = 1 MHz
Capacitance versus reverse applied voltage for bidirectional types (typical values)
C (pF)
SM15T 6V8CA Tj = 25C F = 1 MHz
C (pF)
10000
SM15T 15CA SM15T 30A
1000
SM15T 68A SM15T 200A
1000
SM15T 30CA SM15T 68CA SM15T 200CA
100
100
VR (V)
10 1 10 100 500 10 1 10
VR (V)
100 500
Figure 6.
Peak forward voltage drop versus Figure 7. peak forward current (typical values for unidirectional types)
Transient thermal impedance junction-ambient versus pulse duration - mounting on FR4 PC board with recommended pad layout
IFM (A)
500 100
Zth(j-a) (C/W)
100
Tj initial = 25C
10
Tj initial = 175C
10
1
VFM (V)
1 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
tp (s)
0.1 0.01 0.1 1 10 100 1000
Figure 8.
Relative variation of leakage current versus junction temperature
5E+3 1E+3
IR (Tj) IR (Tj = 25C)
VR = VRM
1E+2
1E+1
1E+0
Tj (C)
1E-1
0
25
50
75
100
125
150
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SM15T
Ordering information scheme
2
Ordering information scheme
SM
Surface Mount Surge rating 15 = 1500 W Breakdown voltage 100 = 100 V Type A = Unidirectional CA = Bidirectional
15 T
xx
CA
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Package mechanical data
SM15T
3
Package mechanical data

Case: JEDEC DO-214AB molded plastic over Planar junction Terminals: Solder plated, solderable per MIL-STD-750, Method 2026 Polarity: For unidirectional types the band indicates cathode Flammability: Epoxy is rated UL94V-0 RoHS package SMC dimensions
Dimensions Ref.
E1
Table 4.
Millimeters Min. Max. 2.45 0.20 3.2 0.41 8.15 7.15 4.70 6.25 1.60
Inches Min. 0.075 0.002 0.114 0.006 0.305 0.260 0.173 0.218 0.030 Max. 0.096 0.008 0.126 0.016 0.321 0.281 0.185 0.246 0.063
A1
D
1.90 0.05 2.90 0.15 7.75 6.60 4.40 5.55 0.75
A2 b
E
c E
A1
E1
b
C
A2 E2 L
E2 D L
Figure 9.
Footprint dimensions (millimeter)
Figure 10. Marking layout
2.20
4.25
2.20
Cathode bar (unidirectional devices only )
e3
3.30
xxx z y ww
e3: ECOPACK ( Leadfree) XXX: Marking Z: Manufacturing location Y: Year WW: week
8.65
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SM15T Table 5. Marking
Marking MDE MDG MDP MDT MDX MEE MEK MEM MEP MER MET MEV MEX MFP MFO MFX MGK MGV MGX Bidirectional SM15T6V8CA SM15T7V5CA SM15T10CA SM15T12CA SM15T15CA SM15T18CA SM15T22CA SM15T24CA SM15T27CA SM15T30CA SM15T33CA SM15T36CA SM15T39CA SM15T68CA SM15T75CA SM15T100CA SM15T150CA SM15T200CA SM15T220CA
Package mechanical data
Unidirectional SM15T6V8A SM15T7V5A SM15T10A SM15T12A SM15T15A SM15T18A SM15T22A SM15T24A SM15T27A SM15T30A SM15T33A SM15T36A SM15T39A SM15T68A SM15T75A SM15T100A SM15T150A SM15T200A SM15T220A
Marking BDE BDG BDP BDT BDX BEE BEK BEM BEP BER BET BEV BEX BFP BFO BFX BGK BGV BGX
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
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Ordering information
SM15T
4
Ordering information
Delivery mode Tape and reel
Part number SM15TxxxA SM15TxxCA
Marking See Table 5 on page 7
Package
Weight
Base qty
SMC See Table 5 on page 7
0.25 g
5000
5
Revision history
Date September-2001 19-Feb-2007 Revision 3B 4 Last issue Reformatted to current standards. Peak pulse power Figure 2 on page 3 updated. Description of Changes
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SM15T
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