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. 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.
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.
- 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.
- 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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