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.
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. Since leakage is usually an undesirable property, today manufacturers produce the 1N4148 and sell it as either part number. It was second-sourced by many manufacturers; Texas Instruments listed their version of the device in an October 1966 data sheet. These device types have an enduring popularity in low-current applications.
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.
IFSM = 1.0 A (pulse width = 1 s), 4.0 A (pulse width = 1 µs) — non-repetitive peak forward surge current