1N
4148W
S / 1N
4448W
S / 1N
914B
W
S —
Sm
all Signal D
iodes
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
1N4148WS / 1N4448WS / 1N914BWS Rev. 1.0 1
March 2008
1N4148WS / 1N4448WS / 1N914BWS
Small Signal Diodes
• General Purpose Diodes
• Fast switching Device( TRR < 4.0 ns )
• Very Small and Thin SMD package
• Moisture Level Sensitivity 1
• Pb-free Version and RoHS Compliant
• Matte Tin (Sn) Lead Finish
• Green Mold Compound
Absolute Maximum Ratings* Ta=25°C unless otherwise noted
* These ratings are limiting values above which the serviceability of any semiconductor device may be impaired.
The factory should be consulted on applications involving pulsed or low duty cycle operations.
Thermal Characteristics
* Device mounted on FR-4 PCB minimum land pad.
Electrical Characteristics Ta=25°C unless otherwise noted
Symbol Parameter Value Units
VRSM Non-Repetitive Peak Reverse Voltage 100 V
VRRM Repetitive Peak Reverse Voltage 75 V
I FRM Repetitive Peak Forward Current 300 mA
IO Continuous Forward Current 150 mA
TJ Operating Junction Temperature Range +150 °C
TSTG Storage Temperature Range -55 to +150 °C
Symbol Parameter Value Unit
RθJA Thermal Resistance, Junction to Ambient 500 °C/W
PD Power Dissipation(TC=25°C) 200 mW
Symbol Parameter Test Conditions Min Typ Max Units
BVR Breakdown Voltage
IR = 100 μA
IR = 5 μA
100
75 V
IR Reverse Current
VR = 20 V
VR = 75 V
25
5
nA
μA
VF Forward Voltage
1N4448WS/ 914BWS
1N4148WS
1N4448WS/ 914BWS
IF = 5 mA
IF = 10 mA
IF = 100 mA
0.62 0.72
1
1
V
CO Diode Capacitance VR = 0, f = 1 MHz 4 pF
TRR Reverse Recovery Time
I F = 10 mA, IR = 60mA
I RR = 1 mA, RL = 100 Ω 4 nS
SOD-323F*Band Denotes Cathode
Device Marking Code
Device Type Device Marking
1N4148WS S1
1N4448WS S2
1N914BWS S3
1N
4148W
S / 1N
4448W
S / 1N
914B
W
S —
Sm
all Signal D
iodes
© 2
1N4
Typical Performance Characteristics
Total Capacitance
Reverse Voltage (V)
0 2 4 6 8 10 12 14
0.44
0.46
0.48
0.50
0.52
0.54
0.56
0.58
TA=25°C
C
ap
ac
ita
nc
e
[p
F]
Forward Voltage vs Ambient Temperature
Forward Current, I
F
[mA]
0.01 0.1 1 10 100
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Ta=-40°C
Ta=25°C
Ta=150°C
Typical
V
F-
F
or
w
ar
d
Vo
lta
ge
[V
]
007 Fairchild Semiconductor Corporation www.fairchildsemi.com
148WS / 1N4448WS / 1N914BWS Rev. 1.0 2
1N
4148W
S / 1N
4448W
S / 1N
914B
W
S —
Sm
all Signal D
iodes
© 2
1N4
Typical Performance Characteristics
Power Derating Curve
Temperature [°C]
0 25 50 75 100 125 150 175
0
50
100
150
200
250
P
D
-
P
ow
er
D
is
si
pa
tio
n
[m
W
]
Reverse Current vs Reverse Voltage
Reverse Voltage, VR[V]
10 20 30 40 50 60 70 80 90 100
10-1
100
101
102
103
104
105
Ta=150°C
Ta=25°C
Ta=-40°C
R
ev
er
se
C
ur
re
nt
[n
A
]
007 Fairchild Semiconductor Corporation www.fairchildsemi.com
148WS / 1N4448WS / 1N914BWS Rev. 1.0 3
1N
4148W
S / 1N
4448W
S / 1N
914B
W
S —
Sm
all Signal D
iodes
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
1N4148WS / 1N4448WS / 1N914BWS Rev. 1.0 4
Typical Performance Characteristics
V
R
-
R
ev
er
se
V
ol
ta
ge
Reverse Voltage vs Reverse Current
Reverse Current, IR[µA]
1 10 100
140
150
160
170
Ta=25°C
1N
4148W
S / 1N
4448W
S / 1N
914B
W
S —
Sm
all Signal D
iodes
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
1N4148WS / 1N4448WS / 1N914BWS Rev. 1.0 5
Package Dimensions
SOD-323F
1N
4148W
S / 1N
4448W
S / 1N
914B
W
S Sm
all Signal D
iodes
1N
4148W
S / 1N
4448W
S / 1N
914B
W
S
© 2007 Fairchild Semiconductor Corporation www.fairchildsemi.com
1N4148WS / 1N4448WS / 1N914BWS Rev. 1.0 6
Rev. I31
TRADEMARKS
The following are registered and unregistered trademarks and service marks Fairchild Semiconductor owns or is authorized to use and
is not intended to be an exhaustive list of all such trademarks.
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS
HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF
THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE
UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF
FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE
PRODUCTS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and (c) 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.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
ACEx®
Build it Now™
CorePLUS™
CROSSVOLT™
CTL™
Current Transfer Logic™
EcoSPARK®
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Fairchild Semiconductor®
FACT Quiet Series™
FACT®
FAST®
FastvCore™
FPS™
FRFET®
Global Power ResourceSM
Green FPS™
Green FPS™ e-Series™
GTO™
i-Lo™
IntelliMAX™
ISOPLANAR™
MegaBuck™
MICROCOUPLER™
MicroFET™
MicroPak™
MillerDrive™
Motion-SPM™
OPTOLOGIC®
OPTOPLANAR®
®
PDP-SPM™
Power220®
Power247®
POWEREDGE®
Power-SPM™
PowerTrench®
Programmable Active Droop™
QFET®
QS™
QT Optoelectronics™
Quiet Series™
RapidConfigure™
SMART START™
SPM®
STEALTH™
SuperFET™
SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
SyncFET™
The Power Franchise®
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TinyBuck™
TinyLogic®
TINYOPTO™
TinyPower™
TinyPWM™
TinyWire™
µSerDes™
UHC®
UniFET™
VCX™
Datasheet Identification Product Status Definition
Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice.
Preliminary First Production
This datasheet contains preliminary data; supplementary data will be pub-
lished at a later date. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve design.
No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design.
Obsolete Not In Production
This datasheet contains specifications on a product that has been discontin-
ued by Fairchild semiconductor. The datasheet is printed for reference infor-
mation only.
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