Surface Mount Schottky Barrier Diode
*Low Turn-on Voltage
*Fast Switching
*PN Junction Guard Ring for Transient and ESD Protection
*Case : SOT-346, Molded Plastic
*Terminals : Solderable per MIL-STD-202,Method 208
*Polarity : See Diagrams Below
*Weight : 0.008 grams (approx.)
*Mounting Position : Any
Features:
WSD490/WSD491
WEITRON
WEITRON
http://www.weitron.com.tw
Mechanical Data:
SCHOTTKY BARRIER
RECTIFIERS
1.0AMPERES
20-40VOLTS
J
K
G
D
C
H
S
A
L
B
3
2
1
Top View
1
2
3
SC-59
A
B
C
D
G
H
J
K
L
S
2.70
1.30
1.00
0.35
1.70
0.00
0.10
0.20
1.25
2.25
3.10
1.70
1.30
0.50
2.30
0.10
0.26
0.60
1.65
3.00
Dim Min
Max
All Dimension in mm
SC-59
SC-59 Outline Dimension
Lead(Pb)-Free
P b
WSD490/WSD491
WEITRON
Item
Marking
Eqivalent Circuit diagram
WSD491
10T
WSD490
10F
2
3
CATHODE
ANODE
2
3
CATHODE
ANODE
Device Marking
Maximum Ratings and Electrical Characteristics
Rating 25 C Ambient Temperature Unless Otherwise Specified.
Single Phase Half Wave, 60Hz , Resistive or Inductive Load.
For Capacitive Load, Derate Current by 20%.
Type Number
WSD491
WSD490
Unit
Maximum Recurrent Peak Reverse Voltage
Maximum RMS Voltage
Maximum DC Blocking Voltage
Maximum Average Forward Rectified Current
Peak Forward Surge Current, 8.3 ms Single Half
Sine-Wave Superimposed on Rated Load (JEDEC Method)
Maximum Instantaneous Forward Voltage at 1.0A
Maximum DC Reverse Current Ta=25 C
At Rated DC Blocking Voltage Ta=100 C
Operating Temperature Range Tj
Storage Temperature Range T
STG
25
14
20
40
28
40
V
V
V
1.0
3.0
0.45
0.53
0.2
4.0
-25....+ 125
-50....+ 125
A
A
V
mA
mA
C
C
http://www.weitron.com.tw
WSD490/WSD491
WEITRON
http://www.weitron.com.tw
175
150
125
100
75
50
25
0 .01
.05
.1
.5
1
50
10
100
5
REVERSE VOLTAGE (V)
J
U
N
C
T
I
O
N
C
A
P
A
C
I
T
A
N
C
E
(
p
F
)
FIG .4 Typical Junction Capacitance
1.2
1.0
0.8
0.6
0.4
0.2
0
0
20
40
60
80
100
120
140
160
180
200
AMBIENT TEMPERATURE ( C)
A
V
E
R
A
G
E
F
O
R
W
A
R
D
C
U
R
R
E
N
T
(
A
)
Single Phase
Half Wave 60Hz
Resistive Or Inductive Load
FIG.2 Typical Forward Current Derating Curve
0
20
40
60
80
100 120 140
PERCENTAGE RATED PEAK REVERSE VOLTAGE
R
E
V
E
R
S
E
L
E
A
K
A
G
E
C
U
R
R
E
N
T
(
m
A
)
100
10
1.0
.1
.01
Tj=75 C
Tj=25 C
FIG.3 Typical Reverse Characteristics
50
10
3.0
1.0
0.1
.01
.1
.3
.5
.7
.9
1.1
1.3
1.5
FORWARE VOLTAGE.(V)
T=25 C
Pulse Width 300us
1% Duty Cycle
I
N
S
T
A
N
T
A
N
E
O
U
S
F
O
R
W
A
R
E
C
U
R
R
E
N
T
(
A
)
FIG.1 Typcial Forward Characteristics
W
SD
49
1
W
SD
49
0
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