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1N4148WS

High-speed switching diode, 75V, 150mA, 4ns trr, 4pF, SOD-323, 1N4148 SMD equivalent

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Manufacturer Part：

1N4148WS

Package：

SOD-323 1.70 x 1.25 x 0.85 mm

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Description

Product Overview

The onsemi 1N4148WS is a high-speed small-signal silicon switching diode in a compact SOD-323 surface-mount package. Rated at 75V reverse voltage and 150 mA forward current, it features fast reverse recovery time of 4 ns, low capacitance of 4 pF, and low forward voltage. The device is ideal for high-speed switching, signal routing, and general-purpose rectification in space-constrained circuits.

Key Specifications

Diode Type Small Signal Switching Diode
Reverse Voltage (VR) 75 V
Forward Current (IF) 150 mA
Forward Voltage (VF) 1.0 V @ 10 mA (Typ)
Reverse Recovery Time (trr) 4 ns (Typ)
Total Capacitance (CT) 4 pF @ 0V, 1 MHz (Typ)
Reverse Current (IR) 25 nA @ 75V (Max @ 25°C)
Power Dissipation 200 mW
Operating Temperature -65°C to +150°C (TJ)
Package SOD-323

Features

  • Ultra-fast switching with 4 ns typical reverse recovery time
  • Low junction capacitance of 4 pF for minimal signal distortion
  • Compact SOD-323 package (1.7 x 1.25 mm) for high-density boards
  • Low reverse leakage current of 25 nA at rated voltage
  • Wide operating temperature range from -65°C to +150°C
  • Industry-standard 1N4148 equivalent in surface-mount format
  • Pb-Free, RoHS compliant

Applications

  • High-speed signal switching and routing
  • Logic gate and protection circuits
  • Reverse current blocking in power management
  • Clipping and clamping circuits
  • General-purpose rectification in consumer electronics

The onsemi 1N4148WS is a high-speed small-signal silicon switching diode in a compact SOD-323 surface-mount package, representing the surface-mount equivalent of the industry-standard 1N4148 through-hole diode. Rated at 75V reverse voltage and 150 mA continuous forward current, the device features an extremely fast reverse recovery time of 4 ns (typical), making it ideal for high-speed digital and analog switching applications. The low junction capacitance of 4 pF minimizes signal distortion in RF and high-frequency circuits. The device achieves a low forward voltage of 1.0V at 10 mA and exhibits very low reverse leakage of 25 nA at rated voltage (25°C). The compact SOD-323 package (1.7 x 1.25 x 0.85 mm) enables high-density PCB designs. The 1N4148WS operates over the full -65°C to +150°C junction temperature range and is Pb-Free and RoHS compliant.

The 1N4148WS is a standard silicon PN junction switching diode. In forward bias, current flows from anode to cathode when the forward voltage exceeds approximately 0.7V (silicon junction potential), with a forward voltage drop of 1.0V at 10 mA. The N-type and P-type regions are relatively lightly doped to achieve a higher breakdown voltage (75V) while maintaining fast switching characteristics. When the diode is rapidly reverse-biased after conducting, stored minority carriers in the junction region must be swept out before the diode blocks current — this reverse recovery time (trr) is only 4 ns, achieved through gold doping or equivalent lifetime-killing techniques. The low junction capacitance of 4 pF results from the small junction area, which also contributes to the fast switching speed. In reverse bias, only a small leakage current of 25 nA flows at rated voltage, increasing with temperature. The 200 mW power dissipation is limited by the thermal resistance of the small SOD-323 package.

Pin Name Type Function
1 Cathode Terminal Marked by band — connect to positive side for reverse blocking
2 Anode Terminal Connect to negative side — current flows anode to cathode in forward bias
  • High-speed digital signal routing and steering in logic circuits
  • Reverse current blocking in battery-powered devices
  • Signal clipping and clamping in analog front-end circuits
  • Freewheeling diode for small relay and solenoid coils
  • Protection diode for MCU GPIO pins against reverse voltage
Manufacturer Part Number Package Notes
onsemi 1N4148W SOD-123 Larger package, same electrical specs
Nexperia 1N4148WS SOD-323 Pin-to-pin compatible equivalent
Vishay 1N4148WS SOD-323 Equivalent switching diode
onsemi BAW56LT1G SOT-23 Dual diode common cathode alternative
NXP BAS16 SOD-323 Equivalent high-speed switching diode
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Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

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Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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