BAS21T
Document number: DS30264 Rev. 11 - 2
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BAS21T
SURFACE MOUNT FAST SWITCHING DIODE
Features
Ultra-Small Surface Mount Package
Fast Switching Speed
For General Purpose Switching Applications
High Reverse Breakdown Voltage
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Mechanical Data
Case: SOT-523
Case Material: Molded Plastic, "Green" Molding Compound
(Note 5). UL Flammability Classification Rating 94V-0
Moisture Sensitivity: Level 1 per J-STD-020D
Terminals: Solderable per MIL-STD-202, Method 208
Lead Free Plating (Matte Tin Finish Annealed over Alloy 42
Leadframe)
Polarity: See Diagram
Weight: 0.002 grams (Approximate)
Ordering Information (Notes 4)
Part Number
Case
Packaging
BAS21T-7-F
SOT-523
3000/Tape & Reel
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant
2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green and
Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. For packaging details, go to our website at http://www.diodes.com/package-outlines.html.
5. Product manufactured with Date Code UO (week 40, 2007) and newer are built with Green Molding Compound. Product manufactured prior to Date Code
UO are built with Non-Green Molding Compound and may contain Halogens or Sb2O3 Fire Retardants.
Marking Information
Date Code Key
Year
2001
2002
2003
…..
2017
2018
2019
2020
2021
2022
2023
2024
Code
M
N
P
…..
E
F
G
H
I
J
K
L
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
SOT-523
Internal Schematic
TOP VIEW
T3 = Product Type Marking Code
YM = Date Code Marking
Y = Year (ex: F = 2018)
M = Month (ex: 9 = September)
T3YM
BAS21T
Document number: DS30264 Rev. 11 - 2
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BAS21T
Maximum Ratings @TA = 25°C unless otherwise specified
Characteristic
Symbol
Value
Unit
Repetitive Peak Reverse Voltage
VRRM
250
V
Working Peak Reverse Voltage
DC Blocking Voltage
VRWM
VR
200
V
RMS Reverse Voltage
VR(RMS)
141
V
Forward Continuous Current (Note 6)
IFM
400
mA
Average Rectified Output Current (Note 6)
IO
200
mA
Non-Repetitive Peak Forward Surge Current @ t = 1.0µs
@ t = 1.0s
IFSM
2.5
0.5
A
Repetitive Peak Forward Surge Current
IFRM
625
mA
Thermal Characteristics
Characteristic
Symbol
Value
Unit
Power Dissipation (Note 6)
PD
150
mW
Thermal Resistance Junction to Ambient (Note 6)
RϴJA
833
°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 7)
V(BR)R
250
V
IR = 100ΩA
Forward Voltage
VF
1.0
1.25
V
IF = 100mA
IF = 200mA
Reverse Current @ Rated DC Blocking Voltage (Note 7)
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 × IR, RL = 100Ω
Notes: 6. Device mounted on FR-4 PCB with recommended pad layout, which can be found on our website at http://www.diodes.com/package-outlines.html.
IFM, IO are valid provided that terminals are kept at ambient temperature.
7. Short duration pulse test used to minimize self-heating effect.
BAS21T
Document number: DS30264 Rev. 11 - 2
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June 2018
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BAS21T
0100 200
200
150
50
100
0
T , AMBIENT TEMPERATURE ( C)
A
Fig. 1 Power Derating Curve
P , POWER DISSIPATION (mW)
D
Note 1
0.001
0.01
0.1
1
0 0.40.2 0. 6
I , INSTANTANEOUS FORWARD CURRENT (A)
F
V , INSTANTANEOUS FORWARD VOLTAGE (V)
Fig. 2 Typical Forward Characteristics
F
0.8 1.2
1.0 1.4
0.0001
0.01
0.001
0.1
1
10
100
050 100 200150 250
V , INSTANTANEOUS REVERSE VOLTAGE (V)
Fig. 3 Typical Reverse Characteristics
R
T = -40ºC
A
T = 25ºC
A
T = 75ºC
A
T = 125ºC
A
T = 150ºC
A
T = 0ºC
A
0.0
0.5
1.0
1.5
3.5
3.0
2.5
2.0
4.0
010 20 4030
C , TOTAL CAPACITANCE (pF)
T
V , DC REVERSE VOLTAGE (V)
Fig. 4 Total Capacitance vs. Reverse Voltage
R
Note 6
BAS21T
Document number: DS30264 Rev. 11 - 2
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June 2018
© Diodes Incorporated
BAS21T
Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
SOT523
E1
E
b
e1
D
A3
e
A2
A1 L
ca
SOT523
Dim
Min
Max
Typ
A1
0.00
0.10
0.05
A2
0.60
0.80
0.75
A3
0.45
0.65
0.50
b
0.15
0.30
0.22
c
0.10
0.20
0.12
D
1.50
1.70
1.60
E
1.45
1.75
1.60
E1
0.75
0.85
0.80
e
0.50 BSC
e1
0.90
1.10
1.00
L
0.20
0.40
0.33
a
0°
--
8°
All Dimensions in mm
Suggested Pad Layout
Please see http://www.diodes.com/package-outlines.html for the latest version.
SOT523
Y1
X
Y
X1
C
Dimensions
Value
(in mm)
C
1.29
X
0.40
X1
0.70
Y
0.51
Y1
1.80
BAS21T
Document number: DS30264 Rev. 11 - 2
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© Diodes Incorporated
BAS21T
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
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website, harmless against all damages.
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2018, Diodes Incorporated
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