1N4148 signal diode
The 1N4148 is a standard silicon switching signal diode. It is one of the most popular and long-lived switching diodes because of its dependable specifications and low cost. Its name follows the JEDEC nomenclature. The 1N4148 is useful in switching applications up to about 100 MHz with a reverse-recovery time of no more than 4 ns.
As the most common mass-produced switching diode, the 1N4148 replaced the older 1N914. They differed mainly in their leakage current specification, however, today most manufacturers list common specifications. For example, Vishay  lists the same leakage current for both parts:
- 25 nA at -20 V, 25°C
- 5 µA at -75 V, 25°C
- 50 µA at -20 V, 150°C
Today manufacturers produce the 1N4148 and sell it as either part number. It was second-sourced by many manufacturers; Texas Instruments listed their version of the device in an October 1966 data sheet. These device types have an enduring popularity in low-current applications.
The JEDEC registered part numbers 1N4148 and 1N914 are diodes in an axial package. Diodes with similar properties are available in surface-mount packages.
- Through-hole package
- Surface-mount packages
- LL4148 in MiniMELF package.
- 1N4148W in SOD-123 package.
- 1N4148WS in SOD-323 package.
- 1N4148WT in SOD-523 package.
Absolute maximum ratings (stress ratings, consult datasheet for recommended ratings)
- VRRM = 100 V (maximum repetitive reverse voltage)
- IO = 200 mA (average rectified forward current)
- IF = 300 mA (DC forward current)
- If = 400 mA (recurring peak forward current)
- IFSM = 1 A at 1 s pulse width; 4 A at 1 µs pulse width (non-repetitive peak forward surge current)
Electrical and thermal characteristics
- VF = 1 V at 10 mA (maximum forward voltage)
- VR = 75 V at 5 µA; 100 V at 100 µA (minimum breakdown voltage and reverse leakage current)
- trr = 4 ns (maximum reverse-recovery time)
- PD = 500 mW (maximum power dissipation)
- 1N914 Datasheet; DO-35 Package; Vishay.
- 1N4148 Datasheet; DO-35 Package; Vishay.
- Michael Predko (2004). 123 robotics experiments for the evil genius. McGraw-Hill Professional. p. 93. ISBN 978-0-07-141358-9.
- The Transistor and Diode Data Book, Texas Instruments Incorporated, publication no. CC-413 71243-73-CSS, no date, page 10-34
- Jonathan Oxer; Hugh Blemings (2009). Practical Arduino: Cool Projects for Open Source Hardware. Apress. p. 10. ISBN 978-1-4302-2477-8.
Small "signal" diodes like the venerable 1N4148/1N914 can cope with about 200mA...
- Michael Gasperi; Philippe E. Hurbain; Philippe Hurbain (2009). Extreme NXT: Extending the Lego Mindstorms NXT to the Next Level (2nd ed.). Apress. p. 211. ISBN 978-1-4302-2453-2.
You could use a 1N4002, but the 1N4148 is smaller and more appropriate for the current...
- 1N4148 Datasheet; DO-35 Package; Fairchild.
- 1N4148 Datasheet; DO-35 Package; Kingtronics.
- LL4148 Datasheet; MiniMELF Package; Kingtronics.
- 1N4148W Datasheet; SOD-123 Package; Diodes Inc.
- 1N4148W Datasheet; SOD-123 Package; MCC.
- 1N4148W Datasheet; SOD-123 Package; Vishay.
- 1N4148WS Datasheet; SOD-323 Package; Diodes Inc.
- 1N4148WS Datasheet; SOD-323 Package; Vishay.
- 1N4148WT Datasheet; SOD-523 Package; Diodes Inc.
- 1N4148X Datasheet; SOD-523 Package; MCC.
- "1". The Semiconctor Data Library (Fourth ed.). Motorola Semiconductor Products, Inc. 1973. p. 73.
- Historical Databooks
- Transistor and Diode Data Book (1973, 1236 pages), Texas Instruments
- Diode Data Book (1978, 210 pages), Fairchild
- Rectifiers and Zener Diodes Data Book (1988, 508 pages), Motorola
- Rectifier Device Data Book (1995, 410 pages), Motorola
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