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)
SOT-523
TOP VIEW
TOP VIEW
Internal Schematic
Ordering Information
(Notes 4)
Part Number
BAS21T-7-F
Notes:
Compliance
Commercial
Case
SOT-523
Packaging
3000/Tape & Reel
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 Sb
2
O
3
Fire Retardants.
Marking Information
T3 = Product Type Marking Code
YM = Date Code Marking
Y = Year (ex: F = 2018)
M = Month (ex: 9 = September)
T3YM
Date Code Key
Year
Code
Month
Code
2001
M
Jan
1
2002
N
Feb
2
2003
P
Mar
3
…..
…..
Apr
4
2017
E
May
5
2018
F
Jun
6
2019
G
Jul
7
2020
H
Aug
8
2021
I
Sep
9
2022
J
Oct
O
2023
K
Nov
N
2024
L
Dec
D
BAS21T
Document number: DS30264 Rev. 11 - 2
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BAS21T
Maximum Ratings
@T
A
= 25°C unless otherwise specified
Characteristic
Repetitive Peak Reverse Voltage
Working Peak Reverse Voltage
DC Blocking Voltage
RMS Reverse Voltage
Forward Continuous Current (Note 6)
Average Rectified Output Current (Note 6)
Non-Repetitive Peak Forward Surge Current
Repetitive Peak Forward Surge Current
Symbol
V
RRM
V
RWM
V
R
V
R(RMS)
I
FM
I
O
@ t = 1.0µs
@ t = 1.0s
I
FSM
I
FRM
Value
250
200
141
400
200
2.5
0.5
625
Unit
V
V
V
mA
mA
A
mA
Thermal Characteristics
Characteristic
Power Dissipation (Note 6)
Thermal Resistance Junction to Ambient (Note 6)
Operating and Storage Temperature Range
Symbol
P
D
R
ϴJA
T
J
, T
STG
Value
150
833
-65 to +150
Unit
mW
°C/W
°C
Electrical Characteristics
@T
A
= 25°C unless otherwise specified
Characteristic
Reverse Breakdown Voltage (Note 7)
Forward Voltage
Reverse Current @ Rated DC Blocking Voltage (Note 7)
Total Capacitance
Reverse Recovery Time
Notes:
Symbol
V
(BR)R
V
F
I
R
C
T
t
rr
Min
250
Max
1.0
1.25
100
15
5.0
50
Unit
V
V
nA
µA
pF
ns
Test Condition
I
R
= 100ΩA
I
F
= 100mA
I
F
= 200mA
T
J
= 25°C
T
J
= 100°C
V
R
= 0, f = 1.0MHz
I
F
= I
R
= 30mA,
I
rr
= 0.1 × I
R
, R
L
= 100Ω
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.
I
FM,
I
O
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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I
F
, INSTANTANEOUS FORWARD CURRENT (A)
200
Note
Note 6
1
1
P
D
, POWER DISSIPATION (mW)
150
0.1
100
0.01
50
0
0
100
T
A
, AMBIENT TEMPERATURE (
C)
Fig. 1 Power Derating Curve
200
0.001
0
0.2
0.4
0.8
1.0
0. 6
1.2
1.4
V
F
, INSTANTANEOUS FORWARD VOLTAGE (V)
Fig. 2 Typical Forward Characteristics
100
T
A
= 150ºC
4.0
3.5
C
T
, TOTAL CAPACITANCE (pF)
10
T
A
= 125ºC
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1
T
A
= 75ºC
0.1
T
A
= 25ºC
0.01
T
A
= 0ºC
0.001
T
A
= -40ºC
0.0001
0
150
200
250
50
100
V
R
, INSTANTANEOUS REVERSE VOLTAGE (V)
Fig. 3 Typical Reverse Characteristics
0
30
40
20
V
R
, DC REVERSE VOLTAGE (V)
Fig. 4 Total Capacitance vs. Reverse Voltage
10
BAS21T
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Package Outline Dimensions
Please see http://www.diodes.com/package-outlines.html for the latest version.
SOT523
E
E1
e1
D
b
A2
A3
c
A1
e
L
a
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 C
Dimensions
C
X
X1
Y
Y1
Y
X1
X
Value
(in mm)
1.29
0.40
0.70
0.51
1.80
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IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
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).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
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
www.diodes.com
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