DTC144TT1

Overview

The DTC144TT1 is an NPN silicon Bias Resistor Transistor (BRT) designed to replace a single device and its external resistor bias network. It integrates a monolithic bias network consisting of a series base resistor (R1) and a base-emitter resistor (R2). The device features a collector-base voltage (VCBO) and collector-emitter voltage (VCEO) of 50 Vdc, with a maximum collector current (IC) of 100 mAdc. Electrical characteristics include a DC current gain (hFE) ranging from 160 to 350 at IC = 5.0 mA and VCE = 10 V. The typical input resistance R1 is 47 kΩ, while R2 is infinite. Thermal dissipation (PD) is rated at 230 mW on minimum pads and 338 mW on 1.0 x 1.0 inch FR-4 pads at 25°C ambient temperature.

Feature Summary

• Integrates a monolithic bias network with a series base resistor and a base-emitter resistor into a single surface mount device.
• Eliminates the need for individual discrete components, reducing system cost and board space requirements.
• Housed in an SC-59 package designed for low power applications, featuring modified gull-winged leads to absorb thermal stress during soldering.

Applications

• Level shifting between 12 or 24 volt circuits and logic levels
• Open collector inverter configurations for signal inversion
• Unregulated current source implementations

Procurement Notes

Verify the specific ordering suffix TT1 corresponds to the SC-59 package and tape and reel shipping configuration. Confirm that the required resistor values match the standard 47 kΩ base resistor and infinite base-emitter resistor configuration documented for this part number before finalizing procurement.

Selection Notes

Select this component when circuit design requires simplification by replacing discrete transistors and bias resistors. Ensure the application operates within the 50 Vdc voltage limits and 100 mAdc current constraints. Consider the SC-59 package dimensions and thermal dissipation capabilities relative to the available PCB pad size for adequate heat management.

Part Context

This component belongs to the DTC144 series of NPN Bias Resistor Transistors manufactured by onsemi. These devices are engineered to streamline digital switching applications by consolidating transistor and resistor functions. The series utilizes surface mount packaging technologies suitable for automated assembly processes.

Replacement Considerations

Compatible substitutes include other NPN BRTs with similar 50 V ratings and integrated bias networks, such as the DTC144TET1G or DTC144EE variants, provided they fit the SC-59 footprint and meet the specific electrical requirements of the circuit.