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1N4148 diodes

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 replaced the 1N914, which had a much higher leakage current (5 microamps vs. 25 nanoamps). Since leakage is almost never a desirable property, today manufacturers produce the 1N4148 and sell it as either part number.[1] It was second sourced by many manufacturers; Texas Instruments listed their version of the device in an October 1966 data sheet.[2] These device types have an enduring popularity in low-current applications.[3][4]

Package Type

The 1N4148 comes in a DO-35 glass package for thru-hole mounting. This is extremely useful for breadboarding of circuits. For surface mount applications, the plastic encapsulated SOD package is also available.[5]


  • VRRM = 100 V (maximum repetitive reverse voltage)
  • IO = 200 mA (average rectified forward current)
  • IF = 300 mA (maximum direct forward current)
  • VF = 1.0 V at 10 mA.[6]
  • IFSM = 1.0 A (pulse width = 1 sec), 4.0 A (pulse width = 1 µsec) (non-repetitive peak forward surge current)
  • PD = 500 mW (power dissipation)
  • TRR < 4 ns (reverse-recovery time)


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  • 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 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... 
  • 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... 
  • http://www.diodes.com/products/catalog/detail.php?item-id=2801#5
  • "1". The Semiconctor Data Library (Fourth ed.). Motorola Semiconductor Products, Inc. 1973. p. 73.