BAT74
®
June 1999 - Ed: 3A
SMALL SIGNAL SCHOTTKY DIODE
VERY SMALL CONDUCTION LOSSES
NEGLIGIBLE SWITCHING LOSSES
LOW FO RWA RD V OLTAG E D RO P
EXTREMELY FAST SWITCHING
SURFACE MOUNT DEVICE
FEAT URES AND BENE FITS
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
VRRM Repetitive peak reverse voltage 30 V
IFRM Repetitive peak forward current δ = 0.33 0.5 A
IFSM Surge non repetitive forward current (tp=10ms sinusoidal) 1 A
Ptot Power Dissipation (note 1) Tamb = 50° C 250 mW
Tstg Maximum s torage temperature range - 65 t o +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
VF * Forward v oltage drop Tj = 25°CI
F
= 0.1 mA 240 mV
IF = 1 mA 320
IF = 10 mA 400
IF = 30 mA 500
IF = 100 mA 900
IR ** Reverse leakage current Tj = 25°CV
R
= 30 V 1 µA
Tj = 100°C 100
STAT IC ELECTRICAL CHARACTE RISTICS (per diode)
Symbol Parameters Tests conditions M in. Typ. Max. Unit
C Junction
Capacitance Tj = 25°C VR = 1 V F = 1 MHz 10 pF
trr R e verse Reco v e ry
Time IF = 10 mA IR = 10 mA Tj = 25° C
Irr = 1 mA R
L
= 100 Ω5ns
DYNAM IC CHA RACTERISTICS (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
δ
=tp/T tp
δ= 1
δ= 0.33
δ= 0.2
δ= 0.1
δ= 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
δ
=tp/T tp
Fig.2 : Average forward current versus ambient
temperature ( δ = 0.33).
Symbol Parameter Value Unit
Rth (j-a) Junction to Ambient (*) 400 °C/W
(*) Mounted on epoxy board with recommended pad layout.
THERMAL RE SISTANCE
Pulse test: * tp = 380 µs, δ < 2%
** tp = 5 ms, δ < 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=25°C
Ta=100°C
Ta=50°C
I
M
t
δ
=0.5
Fig.3 : Non repetitive surge peak forward current
versus overload duration (maximum v alues).
0 5 10 15 20 25 30
1E-2
1E-1
1E+0
1E+1
1E+2
VR(V)
IR(µA)
Tj=50°C
Tj=25°C
Tj=100°C
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
δ
=tp/T tp
Single pulse
δ= 0.1
δ= 0.2
δ= 0.5
Fig.4 : Relative variation of thermal impedance
junction to case versus pulse duration (alumine
substrate 10m m x 8m m 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(µA)
VR=30V
Fig.6 : Junction capacitance versus reverse
voltage applied.
12 5102030
1
2
5
10
VR(V)
C(pF)
F=1MHz
Tj=25°C
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=100°C
Tj=50°C
Tj=25°C
Fig.8 : Forward voltage drop versus forward
current (typical values).
BAT74
3/4
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PACKAGE MECHANICAL DAT A
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 BS C 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
FOOTPRI N T DI ME N SIONS
(in millimeters)
Or dering t ype Marking Package Weight Base qty Delivery m ode
BAT74 D89 SOT-143 0.01g 3000 T ape & reel
Epoxy meets UL94,V0
BAT74
4/4
