Page 1
Features
• Fast Switching Speed
• Surface Mount Package Ideally Suited for Automated Insertion
• For General Purpose Switching Applications
• High Conductance
• Lead Free/RoHS Compliant (Note 1)
SOT23
Top View
MMBD4448H
SURFACE MOUNT SWITCHING DIODE
Mechanical Data
• Case: SOT23
• Case Material: Molded Plastic. UL Flammability Classification
Rating 94V-0
• Moisture Sensitivity: Level 1 per J-STD-020
• Terminals: Matte Tin Finish annealed over Alloy 42 leadframe
(Lead Free Plating). Solderable per MIL-STD-202, Method 208
• Polarity: See Diagram
• Weight: 0.008 grams (approximate)
Top View
Internal Schematic
Ordering Information (Note 2)
Part Number Case Packaging
MMBD4448H-7-F SOT23 3000/Tape & Reel
Notes: 1. No purposefully added lead.
2. For packaging details, go to our website at http://www.diodes.com.
Marking Information
Date Code Key
Year 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015
Code M N P R S T U V W X Y Z A B C
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
MMBD4448H
Document number: DS30176 Rev. 10 - 2
KA3
YM
www.diodes.com
KA3 = Product Type Marking Code
YM = Date Code Marking
Y = Year (ex: N = 2002)
M = Month (ex: 9 = September)
1 of 4
February 2011
© Diodes Incorporated
Page 2
)
θ
(BR)
r
P, P
OWER
P
T
O
N
T
T
O
U
F
O
R
RD CUR
R
T
Maximum Ratings @T
= 25°C unless otherwise specified
A
Characteristic Symbol Value Unit
Non-Repetitive Peak Reverse Voltage
Peak Repetitive Reverse Voltage
Working Peak Reverse Voltage
DC Blocking Voltage
RMS Reverse Voltage
Forward Continuous Current (Note 3)
Average Rectified Output Current (Note 3)
Non-Repetitive Peak Forward Surge Current @ t = 1.0μs
@ t = 1.0s
Thermal Characteristics
Characteristic Symbol Value Unit
Power Dissipation (Note 3)
Thermal Resistance Junction to Ambient Air (Note 3)
Operating and Storage Temperature Range
V
T
V
RM
V
RRM
V
RWM
V
R
R(RMS
I
FM
I
O
I
FSM
P
D
R
JA
, T
J
STG
MMBD4448H
100 V
80 V
57 V
500 mA
250 mA
4.0
1.0
A
350 mW
357
-65 to +150
°C/W
°C
Electrical Characteristics @T
= 25°C unless otherwise specified
A
Characteristic Symbol Min Max Unit Test Condition
Reverse Breakdown Voltage (Note 4)
Forward Voltage
Reverse Current (Note 4)
Total Capacitance
Reverse Recovery Time
Notes: 3. Part mounted on FR-4 board with recommended pad layout, which can be found on our website at http://www.diodes.com.
4. Short duration pulse test used to minimize self-heating effect.
V
V
F
I
⎯
R
C
⎯
T
t
⎯
r
80
R
0.62
⎯
⎯
⎯
⎯
0.72
0.855
1.0
1.25
100
50
30
25
3.5 pF
4.0 ns
V
IR = 2.5μA
= 5.0mA
I
F
= 10mA
I
F
V
I
= 100mA
F
= 150mA
I
F
V
nA
μA
μA
nA
= 70V
R
V
= 75V, TJ = 150°C
R
= 25V, TJ = 150°C
V
R
V
= 20V
R
VR = 6V, f = 1.0MHz
VR = 6V, IF = 5mA
500
1,000
(mA)
400
(mW)
EN
100
I
A
300
WA
S
ANE
AN
F
I, INS
10
T = -40ºC
A
T = 0ºC
A
T = 25ºC
0.8
A
T = 75ºC
A
T = 125ºC
A
1
0.1
0
V , INSTANTANEOUS FORWARD VOLT AGE (V)
F
Fig. 2 Typical Forward Characteristics
1.61.20.4
DISSI
200
D
100
0
0
T , AMBIENT TEMPERATURE (ºC)
A
Fig. 1 Power Derating Curve (Note 3)
1208040 160
200
MMBD4448H
Document number: DS30176 Rev. 10 - 2
2 of 4
www.diodes.com
February 2011
© Diodes Incorporated
Page 3
NST
N
TANEO
US R
R
C
U
R
REN
T
C, T
O
T
CAPACITANC
F
10,000
(nA )
1,000
100
SE
EVE
10
1
A
0.1
R
I, I
0
20 40
V , INSTANTANEOUS REVERSE VOLTAGE (V)
R
Fig. 3 Typical Reverse Characteristics
3.0
2.5
)
E (p
2.0
1.5
AL
1.0
T
0.5
0
01020 4030
V , DC REVERSE VOLTAGE (V)
R
Fig. 4 T otal Capacitance vs. Reverse Voltage
MMBD4448H
f = 1MHz
Package Outline Dimensions
K
J
A
Dim Min Max Typ
A 0.37 0.51 0.40
C
B
H
K1
F
D
G
L
M
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
SOT23
0° 8° -
All Dimensions in mm
Suggested Pad Layout
MMBD4448H
Document number: DS30176 Rev. 10 - 2
Y
Z
X
E
C
3 of 4
www.diodes.com
Dimensions Value (in mm)
Z 2.9
X 0.8
Y 0.9
C 2.0
E 1.35
February 2011
© Diodes Incorporated
Page 4
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.
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Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorize d 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.
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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 © 2011, Diodes Incorporated
www.diodes.com
MMBD4448H
MMBD4448H
Document number: DS30176 Rev. 10 - 2
4 of 4
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February 2011
© Diodes Incorporated
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