BAT74
June 1999 - Ed: 3A
SMALL SIGNAL SCHOTTKY DIODE
VERY SMALL CONDUCTION LOSSES
NEGLIGIBLE SWITCHING LOSSES
LOW FORWARD VOLTAGE DROP
EXTREMELY FAST SWITCHING
SURFACE MOUNT DEVICE
FEATURES AND BENEFITS
Two separate Schottky barrier diodes encapsu-
lated in a SOT-143 small SMD package.
DESCRIPTION
SOT-143
K1
K2
A1
A2
K1
A1
K2
A2
Symbol
Parameter
Value
Unit
V
RRM
Repetitive peak reverse voltage
30
V
I
FRM
Repetitive peak forward current
= 0.33
0.5
A
I
FSM
Surge non repetitive forward current (tp=10ms sinusoidal)
1
A
P
tot
Power Dissipation (note 1)
T
am
b = 50C
250
mW
T
stg
Maximum storage temperature range
- 65 to +150
C
Tj
Maximum operating junction temperature *
150
C
TL
Maximum temperature for soldering during 10s
260
C
Note 1: Ptot is the total dissipation of both diodes
ABSOLUTE RATINGS (limiting values)
* :
dPtot
dTj
<
1
Rth
(
j
-
a
)
thermal runaway condition for a diode on its own heatsink
1/4
Symbol
Parameters
Tests conditions
Min.
Typ.
Max.
Unit
V
F
*
Forward voltage drop
Tj = 25
C
I
F
= 0.1 mA
240
mV
I
F
= 1 mA
320
I
F
= 10 mA
400
I
F
= 30 mA
500
I
F
= 100 mA
900
I
R
**
Reverse leakage current
Tj = 25
C
V
R
= 30 V
1
A
Tj = 100
C
100
STATIC ELECTRICAL CHARACTERISTICS (per diode)
Symbol
Parameters
Tests conditions
Min.
Typ.
Max.
Unit
C
Junction
Capacitance
Tj = 25
C V
R
= 1 V F = 1 MHz
10
pF
t
rr
Reverse Recovery
Time
I
F
= 10 mA I
R
= 10 mA Tj = 25C
I
rr
= 1 mA R
L
= 100
5
ns
DYNAMIC CHARACTERISTICS (Tj = 25 C)
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.00
0.05
0.10
0.15
0.20
0.25
0.30
IF(av) (A)
PF(av)(W)
T
=tp/T
tp
= 1
= 0.33
= 0.2
= 0.1
= 0.05
Fig.1 : Average forward power dissipation versus
average forward current.
0
25
50
75
100
125
150
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
0.18
0.20
Tamb(C)
IF(av)(A)
T
=tp/T
tp
Fig.2 : Average forward current versus ambient
temperature (
= 0.33).
Symbol
Parameter
Value
Unit
R
th (j-a)
Junction to Ambient (*)
400
C/W
(*) Mounted on epoxy board with recommended pad layout.
THERMAL RESISTANCE
Pulse test:
* tp = 380
s,
< 2%
** tp = 5 ms,
< 2%
BAT74
2/4
1E-3
1E-2
1E-1
1E+0
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
t(s)
IM(A)
Ta=25C
Ta=100C
Ta=50C
I
M
t
=0.5
Fig.3 : Non repetitive surge peak forward current
versus overload duration (maximum values).
0
5
10
15
20
25
30
1E-2
1E-1
1E+0
1E+1
1E+2
VR(V)
IR(A)
Tj=50C
Tj=25C
Tj=100C
Fig.5 : Reverse leakage current versus reverse
voltage applied (typical values).
1E-3
1E-2
1E-1
1E+0
1E+1
1E+2
1E-3
1E-2
1E-1
1E+0
tp(s)
Zth(j-a)/Rth(j-a)
T
=tp/T
tp
Single pulse
= 0.1
= 0.2
= 0.5
Fig.4 : Relative variation of thermal impedance
junction to case versus pulse duration (alumine
substrate 10mm x 8mm x 0.5mm).
0
25
50
75
100
125
150
1E-2
1E-1
1E+0
1E+1
1E+2
1E+3
1E+4
Tj(C)
IR(A)
VR=30V
Fig.6 : Junction capacitance versus reverse
voltage applied.
1
2
5
10
20
30
1
2
5
10
VR(V)
C(pF)
F=1MHz
Tj=25C
Fig.7 : Junction capacitance versus reverse
voltage applied (typical values).
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1E-4
1E-3
1E-2
1E-1
5E-1
VFM(V)
IFM(A)
Tj=100C
Tj=50C
Tj=25C
Fig.8 : Forward voltage drop versus forward
current (typical values).
BAT74
3/4
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of
use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by
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 ap-
proval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
1999 STMicroelectronics - Printed in Italy - All rights reserved.
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia
Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A.
http://www.st.com
PACKAGE MECHANICAL DATA
SOT-143
A
L
C
D
E
H
e2
b
b1
e1
A1
REF.
DIMENSIONS
Millimeters
Inches
Min.
Typ.
Max.
Min.
Typ.
Max.
A
0.89
1.12 0.350
0.441
A1
0.013
0.1
0.005
0.039
B
0.76
0.94 0.299
0.370
B1
0.37
0.51 0.146
0.201
C
0.085
0.18 0.033
0.071
D
2.8
3.04 1.102
1.197
E
1.2
1.4
0.472
0.551
e1
1.92 BSC
0.756 BSC
e2
0.2 BSC
0.0787 BSC
H
2.1
2.64 0.827
1.039
S
0.55 ref
0.217 ref
1.92
0.95
2.25
1.1
0.65
0.2
FOOTPRINT DIMENSIONS
(in millimeters)
Ordering type
Marking
Package
Weight
Base qty
Delivery mode
BAT74
D89
SOT-143
0.01g
3000
Tape & reel
Epoxy meets UL94,V0
BAT74
4/4
PDF 
ZIP