BAS19 / BAS20 / BAS21
Document number: DS12004 Rev. 21 - 2 1 of 4
www.diodes.com November 2011
© Diodes Incorporated
BAS19 / BAS20 / BAS21
SURFACE MOUNT FAST SWITCHING DIODE
Features
Fast Switching Speed
Surface Mount Package Ideally Suited for Automated Insertion
For General Purpose Switching Applications
High Conductance
Lead, Halogen and Antimony Free, RoHS Compliant
“Green” Device (Notes 1 and 2)
Qualified to AEC-Q101 Standards for High Reliability
Mechanical Data
Case: SOT23
Case Material: Molded Plastic. UL Flammability Classification
Rating 94V-0
Moisture Sensitivity: Level 1 per J-STD-020
Terminals: Solderable per MIL-STD-202, Method 208
Lead Free Plating (Matte Tin Finish annealed over Alloy 42
leadframe).
Polarity: See Diagram
Weight: 0.008 grams (approximate)
Ordering Information (Note 3)
Part Number Qualification Case Packaging
BAS19-7-F Commercial SOT23 3,000/Tape & Reel
BAS20-7-F Commercial SOT23 3,000/Tape & Reel
BAS20-13-F Commercial SOT23 10,000/Tape & Reel
BAS20Q-13-F Automotive SOT23 10,000/Tape & Reel
BAS21-7-F Commercial SOT23 3,000/Tape & Reel
BAS21Q-7-F Automotive SOT23 3,000/Tape & Reel
BAS21-13-F Commercial SOT23 10,000/Tape & Reel
BAS21Q-13-F Automotive SOT23 10,000/Tape & Reel
Notes: 1. No purposefully added lead. Halogen and Antimony Free.
2. Product manufactured with Data Code V9 (week 33, 2008) and newer are built with Green Molding Compound. Product manufactured prior to Date
Code V9 are built with Non-Green Molding Compound and may contain Halogens or Sb2O3 Fire Retardants.
3. For packaging details, go to our website at http://www.diodes.com.
Marking Information
Date Code Key
Year 2000 2001 2002 ….. 2009 2010 2011 2012 2013 2014 2015 2016 2017
Code L M N ….. W X Y Z A B C D E
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Code 1 2 3 4 5 6 7 8 9 O N D
Top View
SOT23
Top View
Internal Schematic
KXX = Product Type Marking Code
BAS19 Marking: KA8, KT3; KT2
BAS20 Marking: KT2, KT3
BAS21 Marking: KT3
YM = Date Code Marking
Y = Year (ex: Y = 2011)
M = Month (ex: 9 = September)
KXX
YM
BAS19 / BAS20 / BAS21
Document number: DS12004 Rev. 21 - 2 2 of 4
www.diodes.com November 2011
© Diodes Incorporated
BAS19 / BAS20 / BAS21
Maximum Ratings @TA = 25°C unless otherwise specified
Characteristic Symbol BAS19 BAS20 BAS21 Unit
Repetitive Peak Reverse Voltage VRRM 120 200 250 V
Working Peak Reverse Voltage
DC Blocking Voltage VRWM
VR 100 150 200 V
RMS Reverse Voltage VR
(
RMS
)
71 106 141 V
Forward Continuous Current (Note 4) IFM 400 mA
Average Rectified Output Current (Note 4) IO 200 mA
Non-Repetitive Peak Forward Surge Current @ t = 1.0
μ
s
@ t = 1.0s IFSM 2.5
0.5 A
Repetitive Peak Forward Surge Current (Note 4) IFRM 625 mA
Thermal Characteristics
Characteristic Symbol Value Unit
Power Dissipation (Note 4) PD 250 mW
Thermal Resistance Junction to Ambient Air (Note 4) R
θ
JA 500 °C/W
Operating and Storage Temperature Range TJ , TSTG -65 to +150 °C
Electrical Characteristics @TA = 25°C unless otherwise specified
Characteristic Symbol Min Max Unit Test Condition
Reverse Breakdown Voltage (Note 5) BAS19
BAS20
BAS21
V(BR)R 120
200
250 V IR = 100μA
Forward Voltage VF 1.0
1.25 V IF = 100mA
IF = 200mA
Reverse Current @ Rated DC Blocking Voltage (Note 5) IR 100
15 nA
μA TJ = 25°C
TJ = 100°C
Total Capacitance CT 5.0 pF VR = 0, f = 1.0MHz
Reverse Recovery Time trr 50 ns IF = IR = 30mA,
Irr = 0.1 x IR, RL = 100Ω
Notes: 4. Part mounted on FR-4 board with recommended pad layout, w hich can be found on our website at http://www.diodes.com.
5. Short duration pulse test used to minimize self-heating effect.
0120
160 200
250
200
150
50
40 80
100
0
T , AMBIENT TEMPERATURE ( C)
Fig. 1 Power Derating Curve
A
°
P
,
P
O
WE
R
DISSI
P
A
T
I
O
N (mW)
D
Note 4
0.001
0.01
0.1
1
00.40.2 0. 6
I, I
N
S
T
A
N
T
A
N
E
O
U
S
F
O
R
WA
R
D
C
U
R
R
E
N
T
(A)
F
V , INSTANTANEOUS FORWARD VOLTAGE (V)
Fig . 2 Ty pi cal Fo rward Charac t er i st ics
F
0.8 1.2
1.0 1.4
BAS19 / BAS20 / BAS21
Document number: DS12004 Rev. 21 - 2 3 of 4
www.diodes.com November 2011
© Diodes Incorporated
BAS19 / BAS20 / BAS21
0.0001
0.01
0.001
0.1
1
10
100
050100 200150 250
V , INSTANT A NEOUS REVERSE VOLTAGE (V)
Fig. 3 Typical Reverse Characteristics
R
I , INSTANTANEOUS REVERSE VOLTAGE ( A)
R
μ
0.0
0.5
1.0
1.5
3.5
3.0
2.5
2.0
4.0
010 20 4030
C
,
T
O
T
AL
C
A
P
A
C
I
T
AN
C
E (p
F
)
T
V , DC REVERSE VOL TAGE (V)
Fig. 4 Total Capacitance vs. Reverse Voltage
R
Package Outline Dimensions
Suggested Pad Layout
SOT23
Dim Min Max Typ
A 0.37 0.51 0.40
B 1.20 1.40 1.30
C 2.30 2.50 2.40
D 0.89 1.03 0.915
F 0.45 0.60 0.535
G 1.78 2.05 1.83
H 2.80 3.00 2.90
J 0.013 0.10 0.05
K 0.903 1.10 1.00
K1 - - 0.400
L 0.45 0.61 0.55
M 0.085 0.18 0.11
α 0° 8° -
All Dimensions in mm
Dimensions Value (in mm)
Z 2.9
X 0.8
Y 0.9
C 2.0
E 1.35
X E
Y
C
Z
A
M
JL
D
F
BC
H
K
G
K1
BAS19 / BAS20 / BAS21
Document number: DS12004 Rev. 21 - 2 4 of 4
www.diodes.com November 2011
© Diodes Incorporated
BAS19 / BAS20 / BAS21
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