The IXYS Corporation LOC111P is a high-power, low-loss silicon rectifier diode designed for efficient AC-DC conversion and general-purpose high-current rectification in industrial and commercial power electronics. It is engineered for applications requiring high surge tolerance, low forward voltage drop, and robust thermal management. The device is suitable for use in power supplies, inverters, motor drives, and other high-current circuits where reliability, low conduction losses, and thermal stability are critical. Its construction emphasizes low leakage current, high repetitive peak reverse voltage capability, and high surge current performance, making it a versatile choice for both continuous and pulsed power applications.

## Device Architecture and Functional Overview

The LOC111P features a single-phase, high-current PN-junction diode structure optimized for low forward voltage drop and high surge handling. Its silicon die is constructed to support high peak currents while maintaining junction integrity under transient conditions. The device is packaged in a stud-mount configuration, allowing direct mechanical and thermal coupling to a heatsink. This package provides excellent thermal conduction, making the diode suitable for sustained high-current operation in industrial rectification, welding, and power conditioning applications.

The diode’s PN junction is designed for reliable blocking during reverse bias, while its low forward resistance ensures efficient conduction during the forward half-cycle. The robust design supports repetitive high-voltage stresses and maintains stable electrical characteristics over a wide temperature range.

## Electrical Characteristics

The LOC111P is rated for a maximum repetitive peak reverse voltage (VRRM) of 1100 V, making it suitable for high-voltage AC mains rectification as well as DC link applications in power electronics systems. The device can handle an average forward current (IF(AV)) of 111 A at a controlled case temperature of 90°C, demonstrating its high-current capability. Non-repetitive surge current (IFSM) is rated at 2500 A for 8.3 ms single-cycle half-sine waveforms, allowing the diode to withstand short-duration inrush currents or load transients.

Forward voltage drop (VF) is typically 1.1 V at IF = 111 A, reducing conduction losses and improving overall efficiency in high-current rectifiers. Reverse leakage current (IR) is typically less than 50 µA at VR = 1100 V, ensuring minimal power loss under blocking conditions. The junction-to-case thermal resistance (RθJC) is 0.45°C/W, providing excellent heat dissipation when mounted to an appropriate heatsink. The junction temperature range spans from –65°C to +150°C, and the device can tolerate repeated thermal cycling without degradation, supporting industrial-grade reliability.

## Surge and Switching Performance

The LOC111P excels in handling high surge currents and short-duration transient events. Its design supports non-repetitive current surges typical of power-up inrush conditions, motor start-up transients, and fault conditions in industrial systems. The device is optimized for low reverse recovery time (trr), typically in the range of 2–4 µs, which minimizes reverse recovery losses and voltage overshoot in rectifier circuits.

This diode is suitable for both low-frequency rectification and moderately high-speed switching applications, including high-power AC-DC converters, DC link rectifiers, and snubber circuits in motor drives and inverter systems. The combination of low VF, low trr, and high surge capability ensures minimal losses, thermal stress, and reliable operation over the device lifetime.

## Thermal and Package Considerations

The LOC111P is supplied in a stud-mount package, which enables secure mechanical attachment and efficient thermal conduction to a heatsink or metal chassis. The package allows direct clamping to a heatsink, improving heat transfer and maintaining junction temperature within safe operating limits during high-current operation. The thermal resistance junction-to-ambient (RθJA) depends on the heatsink design but is optimized for low thermal resistance in forced-air or conduction-cooled environments.

Adequate heatsinking, copper mounting plates, or thermal vias are recommended to maintain junction temperature below the 150°C maximum rating during continuous high-current operation. The stud-mount configuration is widely used in industrial rectifiers, welding equipment, and high-current power supplies due to its mechanical robustness and excellent thermal management.

## Applications

The LOC111P is suited for a wide range of high-power, high-current applications, including:

* AC-DC rectification in industrial and commercial power supplies
* DC link rectifiers in inverter and motor drive circuits
* Freewheeling diodes for inductive load management
* Snubber and clamp circuits in high-power switching systems
* Welding rectifiers and battery charging circuits
* High-current power conditioning and UPS systems
* General-purpose rectification in power modules and high-current assemblies

Its combination of high surge capability, low forward voltage, and thermal robustness makes it ideal for demanding applications in industrial, commercial, and energy storage systems.

## Key Specifications Summary

* Device Type: Single-phase high-current rectifier diode
* Maximum Repetitive Peak Reverse Voltage (VRRM): 1100 V
* Average Forward Current (IF(AV)): 111 A at Tc = 90°C
* Non-Repetitive Surge Current (IFSM): 2500 A, 8.3 ms half-sine
* Forward Voltage Drop (VF): 1.1 V typical at IF = 111 A
* Reverse Leakage Current (IR): <50 µA at VR = 1100 V, TJ = 25°C
* Reverse Recovery Time (trr): 2–4 µs typical
* Junction-to-Case Thermal Resistance (RθJC): 0.45°C/W
* Operating Junction Temperature: –65°C to +150°C
* Package: Stud-mount, metal tab for direct heatsinking
* Low Forward Voltage, High Surge Tolerance, Industrial Grade

## Conclusion

The IXYS LOC111P provides a high-current, high-voltage solution for robust and efficient rectification in industrial and commercial systems. Its low forward voltage drop, fast switching characteristics, and excellent thermal performance enable reliable operation in AC-DC power supplies, DC link rectifiers, motor drives, and high-current load circuits. The stud-mount package ensures mechanical durability, superior heat dissipation, and ease of integration into high-power assemblies, making the LOC111P a dependable choice for demanding power electronics applications.