onsemi 1N4003RLG: General Purpose Rectifier Diode Datasheet and Application Notes

The onsemi 1N4003RLG is a standard recovery rectifier diode, part of the ubiquitous 1N400x series, designed for general-purpose low-frequency power supply applications. This device is engineered to handle high surge current conditions and is a common choice for AC/DC conversion in various electronic circuits.

A key parameter defining this diode is its repetitive peak reverse voltage (VRRM) of 200V, making it suitable for applications requiring voltage blocking up to this threshold. The diode can sustain a non-repetitive peak surge current (IFSM) of 30A, ensuring robustness against unexpected current spikes often encountered during power supply start-ups. With an average forward rectified current (IF(AV)) of 1.0A, it is perfectly suited for low to moderate power conversion tasks. The device features a low forward voltage drop (typically 1.0V at 1.0A), which contributes to good efficiency in many circuits.

Housed in the DO-41 package, the 1N4003RLG is designed for easy mounting on printed circuit boards and offers excellent mechanical durability. Its construction is optimized for efficient heat dissipation, allowing it to operate effectively within a junction temperature range of -65°C to +175°C.

Typical applications for the onsemi 1N4003RLG include:

Bridge rectifiers in AC/DC power adapters and supplies.

Reverse voltage protection circuits for sensitive components.

Freewheeling diodes in inductive load applications, such as with relays and motors.

General-purpose DC blocking and signal demodulation.

When designing with this diode, it is crucial to consider heat dissipation, especially when operating near its maximum current rating. Ensuring the operating temperature remains within specified limits is vital for long-term reliability. Furthermore, for high-frequency switching applications beyond 10 kHz, alternative fast or ultra-fast recovery diodes should be considered due to the standard recovery characteristics of the 1N4003 series.

ICGOOODFIND: The onsemi 1N4003RLG remains a fundamental and highly reliable component for low-frequency rectification. Its excellent surge current capability, proven durability, and cost-effectiveness make it an enduring and practical choice for a vast array of power supply and protection circuit designs.

Keywords: Rectifier Diode, General Purpose, 200V VRRM, 1.0A IF(AV), DO-41 Package