Features
■ Low forward voltage drop
■ High reliability
■ High surge current capability
■ Soft switching for reduced EMI disturbances
■ Planar technology
STTH108
High voltage ultrafast rectifier
A
K
A
K
Description
The STTH108, which is using ST ultrafast high
voltage planar technology, is specially suited for
free-wheeling, clamping, snubbering,
demagnetization in power supplies and other
power switching applications.
SMA
(JEDEC DO-214AC)
STTH108A
Table 1. Device summary
Symbol Value
I
F(AV)
V
RRM
(max) 175 °C
T
j
V
(max) 1.25 V
F
DO-41
STTH108
1 A
800 V
October 2009 Doc ID 9342 Rev 3 1/6
www.st.com
6
Characteristics STTH108
1 Characteristics
Table 2. Absolute ratings (limiting values)
Symbol Parameter Value Unit
V
V
(RMS)
I
F(AV)
Repetitive peak reverse voltage 800 V
RRM
Voltage rms 560 V
Average forward current
SMA T
DO-41 T
= 110 °C δ = 0.5
L
= 130 °C δ = 0.5
L
1A
SMA 20
I
T
Table 3. Thermal resistance
Forward Surge current t = 8.3 ms
FSM
Storage temperature range -50 to + 175 °C
stg
T
Maximum operating junction temperature 175 °C
j
DO-41 25
Symbol Parameter Value Unit
SMA 30
R
R
Table 4. Static electrical characteristics
Junction to lead
th(j-l)
Junction to ambient
th(j-a)
Lead length = 10 mm DO-41 45
Lead length = 10 mm DO-41 110
°C/W
Symbol Parameter Tests conditions Min. Typ. Max. Unit
Reverse leakage
I
R
current
V
Forward voltage drop
F
Tj = 25 °C
VR = 800 V
= 125 °C 1 50
T
j
T
= 25 °C
j
T
= 125 °C 0.89 1.25
j
= 1 A
I
F
5
1.65
A
µA
V
To evaluate the conduction losses use the following equation:
P = 1.05 x I
Table 5. Dynamic electrical characteristics
Symbol Parameter Tests conditions Min. Typ. Max. Unit
t
rr
t
fr
V
FP
2/6 Doc ID 9342 Rev 3
+ 0.20 I
F(AV)
Reverse
recovery time
Forward
recovery time
Forward
recovery voltage
F2(RMS)
T
= 25 °C
j
T
= 25 °C
j
= 25 °C
T
j
I
= 0.5 A,
F
= 0.25 A
I
rr
IR = 1 A
I
= 1 A,
F
/dt = 50 A/ms
dI
F
VFR = 1.1 x VFmax
= 1 A,
I
F
/dt = 50 A/ms
dI
F
75 ns
200 ns
12 V
STTH108 Characteristics
Figure 1. Conduction losses versus average
current
P(W)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2
δ = 0.05
δ = 0.1
I (A)
F(AV)
δ = 0.2
δ = 0.5
δ
=tp/T
δ = 1
T
tp
Figure 3. Relative variation of thermal
impedance junction ambient versus
pulse duration (DO-41)
Z/R
th(j-c) th(j-c)
1.0
epoxy FR4, leads = 10 mm
0.9
0.8
0.7
0.6
δ = 0.5
0.5
0.4
0.3
δ = 0.2
0.2
δ = 0.1
0.1
Single pulse
0.0
1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
t (s)
p
δ
=tp/T
T
tp
Figure 5. Thermal resistance junction to
ambient versus copper surface
under each lead (DO-41)
R (°C/W)
th(j-a)
120
110
100
90
80
70
60
50
40
30
20
10
0
012345678910
epoxy printed circuit board FR4, copper thickness: 35 µm
S(cm²)
Figure 2. Forward voltage drop versus
forward current
I (A)
FM
100.0
T =150°C
j
(maximum values)
T =150°C
j
(typical values)
10.0
T =25°C
j
1.0
0.1
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
(maximum values)
V (V)
FM
Figure 4. Relative variation of thermal
impedance junction ambient versus
pulse duration (epoxy FR4) (SMA)
Z/R
th(j-c) th(j-c)
1.0
0.9
0.8
0.7
δ = 0.5
0.6
0.5
0.4
δ = 0.2
0.3
δ = 0.1
0.2
0.1
Single pulse
0.0
1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
t (s)
p
δ
=tp/T
T
tp
Figure 6. Thermal resistance junction to
ambient versus copper surface
under each lead (SMA)
R (°C/W)
th(j-a)
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
epoxy printed circuit board FR4, copper thickness: 35 µm
S(cm²)
Doc ID 9342 Rev 3 3/6
Package information STTH108
2 Package information
● Epoxy meets UL 94, V0
● Band indicates cathode
● Bending method (DO-41): see Application note AN1471
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com
ECOPACK
Table 6. SMA dimensions
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
.
Dimensions
E1
Ref.
Millimeters Inches
Min. Max. Min. Max.
D
A1 1.90 2.45 0.075 0.094
A2 0.05 0.20 0.002 0.008
b 1.25 1.65 0.049 0.065
E
A1
C
L
A2
b
c 0.15 0.40 0.006 0.016
D 2.25 2.90 0.089 0.114
E 4.80 5.35 0.189 0.211
E1 3.95 4.60 0.156 0.181
L 0.75 1.50 0.030 0.059
Figure 7. Footprint (dimensions in mm)
1.4
2.63
1.4
5.43
Table 7. DO-41 (plastic) package dimensions
ØD
ØB
CC
A
4/6 Doc ID 9342 Rev 3
1.64
Dimensions
Ref.
Millimeters Inches
Min. Max. Min. Max.
A 4.07 5.20 0.160 0.205
B 2.04 2.71 0.080 0.107
C25.4 1
D 0.71 0.86 0.028 0.034
STTH108 Ordering information
3 Ordering information
Table 8. Ordering information
Order code Marking Package Weight Base qty Delivery mode
STTH108 STTH108 DO-41 0.34 g 2000 Ammopack
STTH108A H08 SMA 0.068 g 5000 Tape and reel
STTH108RL STTH108 DO-41 0.34 g 5000 Tape and reel
4 Revision history
Table 9. Document revision history
Date Revision Changes
Jan-2003 2 Last update.
30-Sep-2009 3 Updated table 7 package dimensions.
Doc ID 9342 Rev 3 5/6
STTH108
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6/6 Doc ID 9342 Rev 3
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