1N4148 signal diode

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

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.


The 1N4148 comes in a DO-35 glass package for through-hole mounting,[1][2][3] which is useful for breadboarding of circuits. Surface mount devices are available: LL4148 in MiniMELF package,[4] 1N4148W in SOD-123 package,[5] 1N4148WS in SOD-323 package,[6] 1N4148X in SOD-523 package.[7]

As the most common mass-produced switching diode, the 1N4148 replaced the older 1N914. They differ mainly in their leakage current specification at 25°C: 25 nA @ -20V vs. 5 µA @ -75V.[8] with maximum leakage for both at 150°C to be 50 µA @ -20V. Today manufacturers produce the 1N4148 and sell it as either part number.[9] It was second-sourced by many manufacturers; Texas Instruments listed their version of the device in an October 1966 data sheet.[10] These device types have an enduring popularity in low-current applications.[11][12]


  • VRRM = 75-100 V — maximum repetitive reverse voltage
  • IO = 75-200 mA — average rectified forward current
  • IF = 200-300 mA — maximum direct forward current
  • VF = 1.0 V at 10 mA.[13]
  • 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

See also[edit]


  1. ^ 1N4148 Datasheet; DO-35 Package; Fairchild.
  2. ^ 1N4148 Datasheet; DO-35 Package; Kingtronics.
  3. ^ 1N4148 Datasheet; DO-35 Package; Vishay.
  4. ^ LL4148 Datasheet; MiniMELF Package; Kingtronics.
  5. ^ 1N4148W Datasheet; SOD-123 Package; Vishay.
  6. ^ 1N4148WS Datasheet; SOD-323 Package; Vishay.
  7. ^ 1N4148X Datasheet; SOD-523 Package; MCC.
  8. ^ 1N914 Datasheet; DO-35 Package; Vishay.
  9. ^ Michael Predko (2004). 123 robotics experiments for the evil genius. McGraw-Hill Professional. p. 93. ISBN 978-0-07-141358-9. 
  10. ^ The Transistor and Diode Data Book, Texas Instruments Incorporated, publication no. CC-413 71243-73-CSS, no date, page 10-34
  11. ^ 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... 
  12. ^ 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... 
  13. ^ "1". The Semiconctor Data Library (Fourth ed.). Motorola Semiconductor Products, Inc. 1973. p. 73. 

External links[edit]

Historical Data Books