ROHM RB491D Datasheet
Diodes
Schottky barrier diode
RB491D
RB491D
Applications
!
Low-power rectification
For switching power supply
Features
!
1) Small surface mounting type. (SMD3)
2) Ultra low V
F
3) I
=1.0A guaranteed despite the size.
Construction
!
F
. (VF=0.40V Typ. at 1A)
Silicon epitaxial planar
Circuit
!
Absolute maximum ratings
!!!!
(Ta=25°C)
External dimensions
!!!!
2.9±0.2
1.9±0.2
0.95 0.95
D 2 E
+0.1
0.4
−0.05
(All leads have the same dimensions)
ROHM : SMD3
EIAJ : SC-59
JEDEC : SOT-346
(Units : mm)
+0.2
−0.1
1.6
2.8±0.2
0.15
+0.1
−0.06
1.1
+0.2
−0.1
0.8±0.1
0~0.1
0.3~0.6
Parameter Symbol
Peak reverse voltage
V
DC reverse voltage
DC forward current
∗
Peak forward surge current
I
Junction temperature
Storage temperature
∗ 60Hz for 1
Electrical characteristics
!!!!
Parameter
Forward voltage
Reverse current
Note) ESD sensitive product handling required.
Tstg −40∼+125 ˚C
(Ta=25°C)
Symbol Min. Typ. Max. Unit Conditions
V
F
IR
Limits
V
I
FSM
RM
R
F
25
20 V
1.0 A
3A
Tj 125 ˚C
−
−
−
0.45
−
200
Unit
V
VµAIF=1.0A
V
R=20V
Diodes
Electrical characteristic curves
!!!!
10
1
(A)
F
100m
10m
FORWARD CURRENT : I
0.1m
C
˚
5
C
˚
2
5
1
C
7
˚
=
5
a
T
C
˚
2
5
2
−
1m
0 0.2 0.3 0.4 0.5 0.60.1
FORWARD VOLTAGE : V
Fig.1 Forward characteristics
F
(V)
(Ta=25°C)
1000
mA)
(
R
REVERSE CURRENT : I
100
Ta=125˚C
10
100µ
10µ
75˚C
1
25˚C
−25˚C
1µ
0.1µ
0 20304050607010
REVERSE VOLTAGE : V
Fig.2 Reversecharacteristics
RB491D
10000
(pF)
T
1000
100
10
TERMINAL CAPACITANCE : C
1
0101520253035405
R
(
V)
REVERSE VOLTAGE : V
Fig.3 Capacitance between
terminals characteristics
R
(V)
f=1MHz
0.7
W)
(
F
0.6
0.5
0.4
D=0.05
D=0.2
D=0.1
D=0.3
sine
D=0.5
0.3
0.2
0.1
FORWARD POWER DISSIPATION : P
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
Tp
AVERAGE RECTIFIED FORWARD CURRENT : I
Fig.4 Forward power dissipation
characteristics
D=0.8
I
F
I
O
T
D=Tp/T
Tj=Tj Max.
1.5
A)
DC
(
O
DC
D=0.8
sine
D=0.5
1.0
D=0.3
D
=
0.2
D=0.1
0.5
D=0.05
0
AVERAGE RECTIFIED FORWARD CURRENT : I
0 25 50 75 100 125
O
(
A)
AMBIENT TEMPERATURE
Tp
=
Tp/T
D
R
=
V
:
Ta ( ˚C)
I
F
I
O
T
V
RM
/2
Fig.5 Derating curve (IO - Ta)
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