1N4148WS T4 SOD-323 fast Switching Diode
The 1N4148WS T4 SOD-323 Patch Switching Diode is a compact, high-speed silicon switching diode designed for signal switching, digital circuits, protection circuits, and other high-frequency electronic applications. Its small SOD-323 surface-mount package makes it suitable for space-constrained PCB designs and automated SMT assembly.
The 1N4148WS is a single switching diode with a typical reverse recovery time of up to 4 ns, making it useful where fast switching performance is important. Common specifications for the T4-marked versions include a 75 V maximum DC reverse voltage, 100 V peak reverse voltage, 150 mA average rectified forward current, and 200 mW power dissipation, depending on the manufacturer and exact datasheet revision.
For Bangladeshi electronics students, engineers, PCB designers, repair technicians, hobbyists, and makers, this diode is a practical choice for compact signal-level switching and general-purpose high-speed diode applications.
Features:
- High-speed switching diode
- 1N4148WS T4 marking
- Compact SOD-323 SMD package
- Fast reverse recovery time: up to 4 ns
- Maximum reverse voltage: 75 V
- Peak reverse voltage: 100 V
- Average rectified forward current: up to 150 mA for the commonly specified T4 version
- Low reverse leakage current
- Single diode configuration
- Surface-mount construction
- Suitable for automated PCB assembly
- Small footprint for compact circuit designs
- Useful for signal switching and high-frequency applications
- RoHS-compliant versions are available depending on manufacturer
Specifications:
| Specification | Details |
|---|---|
| Part Number | 1N4148WS T4 |
| Diode Type | Fast Switching / Signal Diode |
| Semiconductor | Silicon |
| Configuration | Single diode |
| Package | SOD-323 |
| Mounting | Surface Mount (SMD/SMT) |
| Marking | T4 |
| Maximum Reverse Voltage (VR) | 75 V |
| Peak Reverse Voltage (VRM) | 100 V |
| Average Rectified Forward Current | 150 mA |
| Power Dissipation | 200 mW |
| Reverse Recovery Time (trr) | ≤ 4 ns |
| Forward Voltage at 10 mA | Approx. 0.85 V |
| Forward Voltage at 50 mA | Approx. 1.0 V |
| Forward Voltage at 150 mA | Approx. 1.25 V |
| Junction Temperature | Up to 150°C, manufacturer dependent |
| Mounting Position | Any |
| Polarity | Cathode identified by band/marking |
Specifications can vary slightly between manufacturers selling the 1N4148WS under the same part number, so the manufacturer's datasheet should be checked before designing around absolute maximum ratings.
SOD-323 Package and Polarity:
The 1N4148WS T4 uses the SOD-323 two-terminal surface-mount package. The package is designed for compact PCB layouts and automated placement. Some manufacturer datasheets specify approximately 2.5 × 1.25 × 0.9 mm package dimensions, although dimensions can vary slightly by manufacturer.
The band/marked end indicates the cathode. Always verify the manufacturer's package drawing when replacing an SMD diode because visual markings and footprints can differ between suppliers.
Pin Configuration:
| Pin | Connection |
| 1 | Cathode (K) |
| 2 | Anode (A) |
The cathode is normally identified by the diode's marking/band. Some datasheets show the SOD-323 orientation with pin 1 as cathode and pin 2 as anode.
Related Products
