MC34268DTRKG

Overview

The MC34268DTRKG is a fixed positive voltage regulator IC designed for SCSI-2 active termination applications. It provides a stable 2.85V output with an input voltage range up to 15V. The device delivers an output current of 800mA and features a low dropout voltage of approximately 950mV at rated load. It operates within a temperature range of 0°C to 125°C and is housed in a DPAK surface-mount package.

Feature Summary

• Specifically engineered for SCSI-2 active termination circuits
• Low dropout performance ensures efficient regulation under varying load conditions
• Fixed 2.85V output maintains signal integrity for bus termination

Applications

• SCSI-2 active termination circuits
• Bus communication interface power management
• System board voltage regulation for peripheral interfaces

Procurement Notes

Verify the DPAK package configuration and tape-and-reel packaging format against specific manufacturing requirements. Confirm RoHS compliance status as indicated by the 'G' suffix in related part numbers, though datasheet verification is recommended for final assembly compatibility. Ensure thermal management solutions align with the 125°C maximum junction temperature specification.

Selection Notes

Select this component when a dedicated 2.85V regulator is required for SCSI-2 bus termination. The 800mA current capability supports standard active termination loads. Consider the DPAK package for its thermal performance relative to smaller SOT packages, ensuring adequate PCB copper area for heat dissipation during continuous operation at high ambient temperatures.

Part Context

This device belongs to the MC34268 family of low-dropout regulators from onsemi. It serves as a specialized solution for legacy and industrial SCSI interfaces, replacing discrete resistor networks with a regulated voltage source. The family includes variants in SOIC and DPAK packages, offering flexibility for different board space and thermal constraints while maintaining consistent electrical characteristics for bus termination.

Replacement Considerations

Direct replacements include MC34268DG (SOIC-8) and MC34268DR2G (SOIC-8). Verify pinout compatibility between DPAK and SOIC packages if substituting into existing footprints. Alternative LDOs may require external termination resistors unless they integrate SCSI-specific features.