DS30118 Rev. 6 - 2
1 of 3
BAS19W - BAS21W
www.diodes.com
Mechanical Data
Features
BAS19W - BAS21W
SURFACE MOUNT FAST SWITCHING DIODE
Case: SOT-323, Molded Plastic
Case Material - UL Flammability Rating
Classification 94V-0
Moisture sensitivity: Level 1 per J-STD-020A
Terminals: Solderable per MIL-STD-202,
Method 208
Terminal Connections: See Diagram
BAS19W Marking: KA8 or KT2 or KT3 (See Page 3)
BAS20W Marking: KT2 or KT3 (See Page 3)
BAS21W Marking: KT3 (See Page 3)
Weight: 0.006 grams (approx.)
Fast Switching Speed
Surface Mount Package Ideally Suited for
Automatic Insertion
For General Purpose Switching Applications
High Conductance
SOT-323
Dim
Min
Max
A
0.25
0.40
B
1.15
1.35
C
2.00
2.20
D
0.65 Nominal
E
0.30
0.40
G
1.20
1.40
H
1.80
2.20
J
0.0
0.10
K
0.90
1.00
L
0.25
0.40
M
0.10
0.18
a
0
8
All Dimensions in mm
TOP VIEW
A
M
J
L
F
D
B C
H
K
G
Characteristic
Symbol
Min
Max
Unit
Test Condition
Reverse Breakdown Voltage (Note 2) BAS19W
BAS20W
BAS21W
V
(BR)R
120
200
250
V
I
R
= 100
mA
Forward Voltage (Note 2)
V
F
1.0
1.25
V
I
F
= 100mA
I
F
= 200mA
Reverse Current
@ Rated DC Blocking Voltage (Note 2)
I
R
100
15
nA
mA
T
j
= 25
C
T
j
= 100
C
Total Capacitance
C
T
5.0
pF
V
R
= 0, f = 1.0MHz
Reverse Recovery Time
t
rr
50
ns
I
F
= I
R
= 30mA,
I
rr
= 0.1 x I
R
, R
L
= 100
W
Electrical Characteristics
Characteristic
Symbol
BAS19W
BAS20W
BAS21W
Unit
Repetitive Peak Reverse Voltage
V
RRM
120
200
250
V
Working Peak Reverse Voltage
DC Blocking Voltage
V
RWM
V
R
100
150
200
V
RMS Reverse Voltage
V
R(RMS)
71
106
141
V
Forward Continuous Current (Note 1)
I
FM
400
mA
Average Rectified Output Current (Note 1)
I
O
200
mA
Non-Repetitive Peak Forward Surge Current @ t = 1.0
ms
@ t = 1.0s
I
FSM
2.5
0.5
A
Repetitive Peak Forward Surge Current
I
FRM
625
mA
Power Dissipation
P
d
200
mW
Thermal Resistance Junction to Ambient Air (Note 1)
R
qJA
625
C/W
Operating and Storage Temperature Range
T
j
, T
STG
-65 to +150
C
Maximum Ratings
@ T
A
= 25
C unless otherwise specified
@ T
A
= 25
C unless otherwise specified
Notes:
1. Part mounted on FR-4 PC board with minimum recommended pad layout, which can be found on our website at
http:/www.diodes.com/datasheets/ap02001.pdf.
2. Short duration test pulse used to minimize self-heating effect.
DS30118 Rev. 6 - 2
2 of 3
BAS19W - BAS21W
www.diodes.com
0.0001
0.01
0.001
0.1
1
10
100
0
50
100
200
150
250
V , INSTANTANEOUS REVERSE VOLTAGE (V)
R
Fig. 2 Typical Reverse Characteristics
T = -40C
A
T = 25C
A
T = 75C
A
T = 125C
A
T = 150C
A
T = 0C
A
0.0
0.5
1.0
1.5
3.5
3.0
2.5
2.0
4.0
0
10
20
40
30
C
,
T
O
T
A
L
C
AP
ACIT
ANCE
(pF)
T
V , REVERSE VOLTAGE (V)
R
Fig. 3 Typical Capacitance vs. Reverse Voltage
f = 1.0MHz
0
100
200
250
200
150
50
100
0
T , AMBIENT TEMPERATURE (
C)
A
Fig. 4 Power Derating Curve, Total Package
P,
P
O
WER
D
ISSIP
A
T
I
O
N
(
mW)
d
0.001
0.01
0.1
1
0
0.4
0.2
0. 6
I
,
INST
ANT
A
NE
O
US
F
O
R
W
ARD
CURRENT
(A)
F
V , INSTANTANEOUS FORWARD VOLTAGE (V)
F
Fig. 1 Typical Forward Characteristics
0.8
1.2
1.0
1.4
T = 0C
A
T = 150C
A
T = -40C
A
T = 25C
A
T = 75C
A
T = 125C
A
PDF 
ZIP