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DISCRETE SEMICONDUCTORS
DATA SHEET
M3D176
1N4148; 1N4448 High-speed diodes
Product specification Supersedes data of 1996 Sep 03 1999 May 25
Philips Semiconductors
Product specification
High-speed diodes
FEATURES * Hermetically sealed leaded glass SOD27 (DO-35) package * High switching speed: max. 4 ns * General application * Continuous reverse voltage: max. 75 V * Repetitive peak reverse voltage: max. 75 V * Repetitive peak forward current: max. 450 mA.
The diodes are type branded.
handbook, halfpage k
1N4148; 1N4448
DESCRIPTION The 1N4148 and 1N4448 are high-speed switching diodes fabricated in planar technology, and encapsulated in hermetically sealed leaded glass SOD27 (DO-35) packages.
a
MAM246
APPLICATIONS * High-speed switching.
Fig.1 Simplified outline (SOD27; DO-35) and symbol.
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VRRM VR IF IFRM IFSM PARAMETER repetitive peak reverse voltage continuous reverse voltage continuous forward current repetitive peak forward current non-repetitive peak forward current square wave; Tj = 25 C prior to surge; see Fig.4 t = 1 s t = 1 ms t=1s Ptot Tstg Tj Note 1. Device mounted on an FR4 printed circuit-board; lead length 10 mm. total power dissipation storage temperature junction temperature Tamb = 25 C; note 1 - - - - -65 - 4 1 0.5 500 +200 200 A A A mW C C see Fig.2; note 1 CONDITIONS - - - - MIN. MAX. 75 75 200 450 V V mA mA UNIT
1999 May 25
2
Philips Semiconductors
Product specification
High-speed diodes
ELECTRICAL CHARACTERISTICS Tj = 25 C unless otherwise specified. SYMBOL VF 1N4148 1N4448 IR IR Cd trr reverse current reverse current; 1N4448 diode capacitance reverse recovery time PARAMETER forward voltage see Fig.3 IF = 10 mA IF = 5 mA IF = 100 mA VR = 20 V; see Fig.5 VR = 20 V; Tj = 150 C; see Fig.5 VR = 20 V; Tj = 100 C; see Fig.5 f = 1 MHz; VR = 0; see Fig.6 when switched from IF = 10 mA to IR = 60 mA; RL = 100 ; measured at IR = 1 mA; see Fig.7 when switched from IF = 50 mA; tr = 20 ns; see Fig.8 - - - - CONDITIONS
1N4148; 1N4448
MIN. 1
MAX. V V V
UNIT
0.62 -
0.72 1 25 50 3 4 4
nA A A pF ns
Vfr
forward recovery voltage
2.5
V
THERMAL CHARACTERISTICS SYMBOL Rth j-tp Rth j-a Note 1. Device mounted on a printed circuit-board without metallization pad. PARAMETER thermal resistance from junction to tie-point thermal resistance from junction to ambient CONDITIONS lead length 10 mm lead length 10 mm; note 1 VALUE 240 350 UNIT K/W K/W
1999 May 25
3
Philips Semiconductors
Product specification
High-speed diodes
GRAPHICAL DATA
1N4148; 1N4448
handbook, halfpage
300
MBG451
handbook, halfpage
600
MBG464
IF (mA) 200
IF (mA) 400
(1) (2) (3)
100
200
0 0 100 Tamb (oC) 200
0 0 (1) Tj = 175 C; typical values. (2) Tj = 25 C; typical values. (3) Tj = 25 C; maximum values. 1 VF (V) 2
Device mounted on an FR4 printed-circuit board; lead length 10 mm.
Fig.2
Maximum permissible continuous forward current as a function of ambient temperature.
Fig.3
Forward current as a function of forward voltage.
102 handbook, full pagewidth IFSM (A)
MBG704
10
1
10-1 1 Based on square wave currents. Tj = 25 C prior to surge. 10
102
103
tp (s)
104
Fig.4 Maximum permissible non-repetitive peak forward current as a function of pulse duration.
1999 May 25
4
Philips Semiconductors
Product specification
High-speed diodes
1N4148; 1N4448
103 handbook, halfpage IR (A)
MGD290
MGD004
handbook, halfpage
1.2
10
2
Cd (pF) 1.0
(1) (2)
10 0.8 1
10-1
0.6
10-2 0 100 Tj (oC) 200
0.4 0 10 VR (V) 20
(1) VR = 75 V; typical values. (2) VR = 20 V; typical values.
f = 1 MHz; Tj = 25 C.
Fig.5
Reverse current as a function of junction temperature.
Fig.6
Diode capacitance as a function of reverse voltage; typical values.
1999 May 25
5
Philips Semiconductors
Product specification
High-speed diodes
1N4148; 1N4448
handbook, full pagewidth
tr D.U.T. 10% SAMPLING OSCILLOSCOPE R i = 50 VR 90%
tp t
RS = 50 V = VR I F x R S
IF
IF
t rr t
(1)
MGA881
input signal
output signal
(1) IR = 1 mA.
Fig.7 Reverse recovery voltage test circuit and waveforms.
I
1 k
450
I 90%
V
R S = 50
D.U.T.
OSCILLOSCOPE R i = 50 10%
MGA882
V fr
t tr tp
t
input signal
output signal
Fig.8 Forward recovery voltage test circuit and waveforms.
1999 May 25
6
Philips Semiconductors
Product specification
High-speed diodes
PACKAGE OUTLINE Hermetically sealed glass package; axial leaded; 2 leads
1N4148; 1N4448
SOD27
(1)
b
D
L
G1
L
DIMENSIONS (mm are the original dimensions) UNIT mm b max. 0.56 D max. 1.85 G1 max. 4.25 L min. 25.4 0 1 scale 2 mm
Note 1. The marking band indicates the cathode. OUTLINE VERSION SOD27 REFERENCES IEC A24 JEDEC DO-35 EIAJ SC-40 EUROPEAN PROJECTION ISSUE DATE 97-06-09
DEFINITIONS Data Sheet Status Objective specification Preliminary specification Product specification Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
1999 May 25
7
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For all other countries apply to: Philips Semiconductors, International Marketing & Sales Communications, Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825 (c) Philips Electronics N.V. 1999
Internet: http://www.semiconductors.philips.com
SCA 65
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
115002/03/pp8
Date of release: 1999 May 25
Document order number:
9397 750 05892

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