UC3845DR2

DC DC Switching Controllers Overview

The UC3845DR2 is a current-mode PWM controller manufactured by onsemi, designed for flyback and boost DC-DC converter topologies. It operates within a supply voltage range of 7.6V to 30V and supports switching frequencies up to 500kHz. The device features a maximum duty cycle of 48% and provides one positive output capable of isolation. Packaged in a 14-SOIC (3.90mm wide) surface-mount format, it functions within an ambient temperature range of 0°C to 70°C. This component is classified as obsolete and no longer in production.

DC DC Switching Controllers Feature Summary

• Implements current-mode pulse width modulation control for efficient power regulation
• Supports both flyback and boost converter circuit architectures
• Provides a single positive output stage suitable for isolated applications

DC DC Switching Controllers Applications

• Flyback DC-DC converter designs
• Boost converter implementations
• General-purpose switched-mode power supplies

DC DC Switching Controllers Procurement Notes

This component is officially listed as obsolete and no longer in manufacturing. Verification of availability should focus on surplus or secondary market sources rather than direct manufacturer distribution. Confirm the specific revision status and RoHS compliance, as the datasheet indicates non-compliance with current environmental standards. Ensure that any substitute parts maintain compatibility with the original design requirements.

DC DC Switching Controllers Selection Notes

Designers requiring this specific controller must account for its discontinued status when planning long-term production. Selection should prioritize verified replacement components from the same family, such as the UC3845AD or UC3845D, which offer similar electrical characteristics. Verify that alternative packages and pinouts match the existing PCB layout constraints before finalizing the component choice.

DC DC Switching Controllers Part Context

The UC3845 series belongs to onsemi's legacy line of current-mode PWM controllers, widely used in offline and DC-DC power conversion applications. The DR2 suffix typically denotes a specific tape-and-reel packaging configuration for the 14-SOIC package. This part represents an earlier generation of power management ICs compared to modern integrated solutions.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitutes include UC3845AD, UC3845D, UC3845TR, and UC3845DTR from Texas Instruments.