1N4148
Encyclopedia
The 1N4148 is a standard silicon
Silicon
Silicon is a chemical element with the symbol Si and atomic number 14. A tetravalent metalloid, it is less reactive than its chemical analog carbon, the nonmetal directly above it in the periodic table, but more reactive than germanium, the metalloid directly below it in the table...

 switching diode
Diode
In electronics, a diode is a type of two-terminal electronic component with a nonlinear current–voltage characteristic. A semiconductor diode, the most common type today, is a crystalline piece of semiconductor material connected to two electrical terminals...

. Its name follows the JEDEC
JEDEC
The JEDEC Solid State Technology Association, formerly known as the Joint Electron Devices Engineering Council , is an independent semiconductor engineering trade organization and standardization body...

 nomenclature. The 1N4148 has a DO-35  glass package and is very useful at high frequencies with a reverse recovery time of no more than 4ns. It was second source
Second source
In the electronics industry, a second source is a company that is licensed to manufacture and sell components originally designed by another company ....

d by many manufacturers; Texas Instruments
Texas Instruments
Texas Instruments Inc. , widely known as TI, is an American company based in Dallas, Texas, United States, which develops and commercializes semiconductor and computer technology...

listed their version of the device in an October 1966 data sheet.

The 1N914 is an equivalent diode (meaning it has the same specifications, but some manufacturers use one part number or the other).
These devices types have an enduring popularity in low-current applications.

Specifications:
  • VRRM = 100V (Maximum Repetitive Reverse Voltage)
  • IO = 200mA (Average Rectified Forward Current)
  • IF = 300mA (DC Forward Current)
  • IFSM = 1.0 A (Pulse Width = 1 sec), 4.0 A (Pulse Width = 1 uSec) (Non-Repetitive Peak Forward Surge Current)
  • PD = 500 mW (power Dissipation)
  • TRR < 4ns (reverse recovery time)
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