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.
Video 1N4148 signal diode
Overview
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. 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. 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.
Though the original 1N4148 and 1N914 existed only in an axial package, the 1N4148 was later repackaged into various surface-mount packages.
- Through-hole package
- 1N4148 in DO-35 glass axial package.
- Surface-mount packages
- LL4148 in MiniMELF package.
- 1N4148W in SOD-123 package.
- 1N4148WS in SOD-323 package.
- 1N4148WT in SOD-523 package.
- Note: Some surface-mount packages are marked with "T4" text.
Maps 1N4148 signal diode
Specifications
- 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.
- 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
- 1N400x general purpose diodes
- 1N58xx schottky diodes
References
External links
- Datasheets / Databooks
- Transistor and Diode Data Book (1973, 1236 pages), Texas Instruments
- Diode Data Book (1978, 210 pages), Fairchild
Source of the article : Wikipedia
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