1N4148

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 through-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. They differ mainly in their leakage current specification at 25°C: 25 nA @ -20V vs. 5 µA @ -75V.^[2] 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.^[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]

If even higher switching frequency or lower forward voltage drop is desired, and higher reverse leakage can be tolerated, the small signal Schottky diode 1N5711 is a good replacement part.

Specifications

• V_RRM = 75-100 V — maximum repetitive reverse voltage
• I_O = 75-200 mA — average rectified forward current
• I_F = 200-300 mA — maximum direct forward current
• V_F = 1.0 V at 10 mA.^[7]
• I_FSM = 1.0 A (pulse width = 1 s), 4.0 A (pulse width = 1 µs) — non-repetitive peak forward surge current
• P_D = 500 mW — power dissipation
• T_RR < 4 ns — reverse-recovery time

See also

• 1N400x general purpose diodes
• 1N58xx schottky diodes

References

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.

External links

• Vishay. "1N4148" (PDF). Data Sheet. Retrieved 2012-09-06.
• Fairchild Semiconductor. "1N/FDLL914/A/B/916/A/B/4148/4448" (PDF). Data Sheet. Retrieved 2012-09-06.
• NXP Semiconductors. "1N4148; 1N4448" (PDF). Data Sheet. Retrieved 2012-09-06.