onsemi 1N4004G Rectifier Diode: Key Specifications and Application Circuits

The 1N4004G from onsemi is a cornerstone component in the world of power supply design, representing the industry-standard 1N400x series of general-purpose rectifier diodes. This device is engineered to handle high currents and withstand reverse voltages, making it an ideal choice for converting alternating current (AC) to direct current (DC) in a wide array of electronic equipment.

Key Specifications

Understanding the critical parameters of the 1N4004G is essential for proper circuit design and ensuring long-term reliability.

Repetitive Peak Reverse Voltage (VRRM): 400 V. This is the maximum reverse-bias voltage the diode can withstand repeatedly without breaking down. It defines the diode's position in the 1N400x family (e.g., 1N4001 = 50V, 1N4007 = 1000V).

Average Forward Rectified Current (IO): 1 A. This is the maximum allowable average forward current. The diode can handle peak currents much higher for short durations.

Peak Forward Surge Current (IFSM): 30 A. This is the maximum non-repetitive surge current the diode can tolerate for a single half-sine wave at a specified duration (typically 8.3ms). This rating is crucial for handling the initial inrush current at power-up.

Forward Voltage Drop (VF): Approximately 1.1 V at 1 A. This is the voltage lost across the diode when it is conducting, which generates heat and impacts efficiency.

Reverse Recovery Time (trr): This value is not exceptionally fast (typically ~2µs), classifying it as a general-purpose rectifier. It is not suitable for high-frequency switching applications (>10kHz) but is perfect for 50/60 Hz line frequency rectification.

Application Circuits

The 1N4004G finds its primary use in various power conversion stages.

1. Half-Wave Rectifier: This is the simplest circuit, using a single diode. It blocks the negative half of the AC cycle, allowing only positive half-cycles to pass to the load. While simple, it is inefficient because it only uses half of the input waveform.

2. Full-Wave Bridge Rectifier: This is the most common application. Four diodes, including the 1N4004G, are arranged in a bridge configuration. It inverts the negative half-cycles of the AC input to create a pulsating DC output that utilizes the entire input waveform, doubling the efficiency of a half-wave rectifier. This pulsating DC is then smoothed by a filter capacitor to create a stable DC voltage.

3. DC Polarity Protection: A diode can be placed in series with the DC power input of a circuit. This ensures that the circuit is only powered if the supply polarity is correct, protecting sensitive components from accidental reverse connection.

4. Freewheeling Diode: When used in circuits with inductive loads like relays or motors, the 1N4004G is placed in parallel with the coil. It provides a safe path for the current to decay when the driving switch (like a transistor) turns off, protecting the switch from voltage spikes induced by the collapsing magnetic field.

ICGOODFIND Summary

The onsemi 1N4004G remains an exceptionally reliable and cost-effective solution for low-frequency power rectification up to 1A and 400V. Its robustness, characterized by its high surge current rating and voltage capability, makes it a ubiquitous choice in AC/DC adapters, appliance control boards, and general-purpose DC power supplies. While unsuitable for high-frequency switching, its performance in 50/60 Hz applications is unmatched for its price and availability.

Keywords:

Rectifier Diode

Power Supply

Forward Voltage

Peak Reverse Voltage

Bridge Rectifier