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1N4148 diodes in DO-35 glass-encapsulated axial lead package

The 1N4148 is a standard silicon switching 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. The 1N4148 comes in a DO-35 glass package for thru-hole mounting. This is useful for breadboarding of circuits. A surface mount device, 1N4148WS, is available in a plastic SOD package.[1]

As the most common mass-produced switching diode, the 1N4148 replaced the older 1N914, which had a 200 times greater leakage current: 5 µA vs. 25 nA.[2] Since leakage is usually an undesirable property, today manufacturers produce the 1N4148 and sell it as either part number.[3] It was second-sourced by many manufacturers; Texas Instruments listed their version of the device in an October 1966 data sheet.[4] These device types have an enduring popularity in low-current applications.[5][6]


  • VRRM = 75-100 V — maximum repetitive reverse voltage
  • IO = 75-200 mA — average rectified forward current
  • IF = 300 mA — maximum direct forward current
  • VF = 1.0 V at 10 mA.[7]
  • IFSM = 1.0 A (pulse width = 1 s), 4.0 A (pulse width = 1 µs) — non-repetitive peak forward surge current
  • PD = 500 mW — power dissipation
  • TRR < 4 ns — reverse-recovery time


  1. ^ http://www.diodes.com/products/catalog/detail.php?item-id=2801#5
  2. ^ Vishay. "1N914" (PDF). Data Sheet. Retrieved 2014-08-06. 
  3. ^ Michael Predko (2004). 123 robotics experiments for the evil genius. McGraw-Hill Professional. p. 93. ISBN 978-0-07-141358-9. 
  4. ^ The Transistor and Diode Data Book, Texas Instruments Incorporated, publication no. CC-413 71243-73-CSS, no date, page 10-34
  5. ^ Jonathan Oxer and 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... 
  6. ^ Michael Gasperi, Philippe E. Hurbain, and 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... 
  7. ^ "1". The Semiconctor Data Library (Fourth ed.). Motorola Semiconductor Products, Inc. 1973. p. 73. 

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