Adafruit
1N4148 SMT SOD-123 Diodes - 100 Pack
$9.95
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A bulk pack of 100 surface-mount 1N4148 signal diodes in SOD-123 package. These are the same fast-switching 1N4148 diodes used in through-hole projects, but ...
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A bulk pack of 100 surface-mount 1N4148 signal diodes in SOD-123 package. These are the same fast-switching 1N4148 diodes used in through-hole projects, but in a compact SMT form factor — particularly popular for custom keyboard PCBs where each key switch needs its own diode.
Key Features
- SOD-123 Package – Compact surface-mount form factor
- Fast Switching – 4 ns reverse recovery time for high-frequency circuits
- Small Signal Use – Rated for 200 mA forward current
- 100 V Reverse Voltage – Suitable for most signal-level applications
- 100 Pieces – Bulk pack for keyboard builds and production runs
Specifications
- Part Number: 1N4148
- Max Forward Current: 200 mA
- Peak Reverse Voltage: 100 V
- Forward Voltage Drop: ~0.7 V (typical)
- Reverse Recovery Time: 4 ns
- Package: SOD-123 (surface mount)
Common Applications
- Custom mechanical keyboard PCBs (key matrix diodes)
- Signal rectification and clamping
- Switching and logic protection circuits
- SMD PCB production and assembly
Package Contents
- 100× 1N4148 signal diodes (SOD-123)
Note: This is a surface-mount part. SMD soldering skills are required. Looking for through-hole? See our 1N4148 through-hole 10-pack.
Jargon buster
Plain-language definitions for the technical terms used above.
- 1N4148
- A common small-signal switching diode used for low-current electronic signals. It is a good choice for fast signal switching or simple protection tasks, but not for carrying large power currents.
- Forward voltage drop
- Forward voltage drop is the small amount of voltage lost across a diode or diode-like circuit when current flows through it. A lower drop is important because it wastes less power and helps keep the rest of the project supplied with enough voltage.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- peak reverse voltage
- The maximum reverse voltage a diode can block without breaking down. This matters in power supplies and protection circuits because the diode must withstand the highest voltage it may see when it is not conducting.
- SMD
- SMD means surface-mount device, a component style designed to be soldered directly onto the surface of a circuit board rather than through holes. SMD parts are compact and mounted flat on the board, which suits smaller and mass-produced designs.
- through-hole
- A mounting style where the component leads pass through holes in a circuit board and are soldered on the other side. Through-hole parts are often easier to handle and solder by hand, which is useful for classroom and hobby projects.
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