1N4001

1N4001 General Purpose Rectifier Diode

Overview

The 1N4001 is a general-purpose rectifier diode belonging to the 1N400x series, widely used in power supply applications for converting alternating current (AC) to direct current (DC). With its low forward voltage drop and high surge current capability, it is suitable for a variety of low-frequency rectification tasks. The diode is designed for use in consumer electronics, industrial equipment, and power conversion circuits where reliability and cost-effectiveness are critical.

The 1N4001 is part of a family of diodes (1N4001 to 1N4007) that vary primarily in their peak repetitive reverse voltage (VRRM) ratings. The 1N4001 specifically supports a VRRM of 50V, making it ideal for low-voltage applications. Its robust construction ensures durability under high surge conditions, and its thermal characteristics allow for stable operation across a wide temperature range.

Features

• Low Forward Voltage Drop: Ensures minimal power loss during conduction, improving efficiency.
• High Surge Current Capability (30A): Withstands short-duration high-current surges, making it resilient in demanding conditions.
• Wide Operating Temperature Range: Functions reliably from -55°C to +175°C, suitable for harsh environments.
• Low Reverse Leakage Current: Reduces power loss when the diode is reverse-biased.
• Standard DO-41 Package: Easy to integrate into through-hole PCB designs.
• High Reliability: Robust construction ensures long-term performance in rectification applications.

Applications

The 1N4001 is commonly used in the following applications:

• Power Supply Rectification: Converts AC to DC in power adapters, battery chargers, and linear power supplies.
• Reverse Polarity Protection: Prevents damage to circuits by blocking reverse current flow.
• Freewheeling Diode: Used in inductive load circuits (relays, motors) to suppress voltage spikes.
• General-Purpose Switching: Suitable for low-frequency switching applications.
• Voltage Multipliers: Used in Cockcroft-Walton voltage multiplier circuits.

Electrical Characteristics

All specifications are measured at TA = 25°C unless otherwise noted.

Absolute Maximum Ratings

• Peak Repetitive Reverse Voltage (VRRM): 50V
• Average Rectified Forward Current (IF(AV)): 1.0A (with 0.375" lead length @ TA = 75°C)
• Non-Repetitive Peak Forward Surge Current (IFSM): 30A (8.3ms single half-sine-wave)
• I²t Rating for Fusing (t < 8.3ms): 3.7 A²s
• Storage Temperature Range (TSTG): -55°C to +175°C
• Operating Junction Temperature (TJ): -55°C to +175°C

Thermal Characteristics

• Power Dissipation (PD): 3.0W
• Thermal Resistance, Junction to Ambient (RθJA): 50°C/W

Electrical Parameters

• Forward Voltage (VF) @ 1.0A: 1.1V
• Maximum Full Load Reverse Current (Irr) @ TA = 75°C: 30µA
• Reverse Current (IR) @ Rated VR:
  • 5.0µA @ TA = 25°C
  • 50µA @ TA = 100°C
• Total Capacitance (CT) @ VR = 4.0V, f = 1.0MHz: 15pF

Package Information

The 1N4001 is housed in a standard DO-41 package, which is a through-hole, axial-leaded design. This package is widely used due to its ease of assembly and mechanical stability.

DO-41 Package Dimensions

• Body Diameter: 2.7mm (max)
• Body Length: 5.2mm (max)
• Lead Diameter: 0.8mm (nominal)
• Lead Length: 25.4mm (standard)

Marking Information

The diode is typically marked with "1N4001" for identification. Polarity is indicated by a band on the cathode side.

Conclusion

The 1N4001 is a versatile and reliable rectifier diode suitable for a broad range of low-voltage applications. Its combination of low forward voltage, high surge current tolerance, and robust thermal performance makes it a preferred choice for designers requiring efficient and durable rectification. Whether used in power supplies, protection circuits, or general switching, the 1N4001 delivers consistent performance under varying conditions.