1N4149 100V 200mA General Purpose Diode – Datasheet

The 1N4149 Diode is a high-speed switching diode, with a reverse voltage rating of 100 V and is suitable for forwarding currents of up to 200 mA. The 1N4149 Diode has a high switching speed of 4ns. The forward voltage drop of the diode is 1.0 V.

Features of 1N4149

  • High Reliability
  • Low forward voltage
  • High-speed switching
  • Low reverse leakage current
  • Lead-free finish, RoHS compliant

Pinout of 1N4149

Specification of 1N4149

Package TypeDO-41
Average Rectified Current (Io)0.5 A
Operating Temperature-Max175.0 Cel
Output Current-Max200 mA
Peak Repeat. Reverse Voltage100 V
Max. Reverse Current (Ir)0.025 mA
Max. RMS Reverse Voltage (Vr)75 V
Max. Forward Voltage Drop (Vf)1.0 V
Max Power Dissipation500 mW
Reverse Current5 µA

Uses of 1N4149

1N4149 diode can be used in many general-purpose applications. It can be used to build a bridge rectifier, an integral part of DC power supplies that convert AC to DC. It can also be used for clipper applications, reverse current blocking in various component protection circuits, logic gates, etc.

Advantages of 1N4149

  • Cheap construction
  • Low forward voltage drop
  • Low reverse leakage
  • High forward surge current capability


  • Power supply for electronic equipment
  • Battery charging circuit
  • Adapter
  • Rectifier circuit
  • Switching device
  • Purpose of short-circuit protection

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