DTC143Z

Overview

The onsemi DTC143Z is a single NPN Bias Resistor Transistor (BRT) designed to replace discrete transistors and external bias networks. It integrates a monolithic bias network consisting of a series base resistor and a base-emitter resistor within a small surface-mount package. Key electrical parameters include a maximum collector-emitter voltage (VCEO) of 50 V, a continuous collector current (IC) of 100 mA, and a minimum DC current gain (hFE) of 80 at IC=10 mA and VCE=5 V. The device features a typical input resistance (R1) of 4.7 kΩ and an emitter-base resistance (R2) of 47 kΩ, establishing a fixed resistor ratio of 10. It operates with a power dissipation (Pd) of up to 150 mW and supports a maximum operating temperature of +150°C.

Feature Summary

• Integrates a monolithic bias network with built-in resistors to eliminate external components
• Enables simple inverter circuit configuration by requiring only on/off condition settings
• Utilizes thin-film resistors with complete isolation to allow negative input biasing

Applications

• Inverter circuits
• Interface logic drivers
• General-purpose switching applications

Procurement Notes

Verify the specific suffix code for the desired package type, as the base part number covers multiple form factors including SOT-23 and SOT-323. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer, as these details vary by production batch and packaging option.

Selection Notes

Select this component when board space reduction is critical and external bias resistors can be replaced by integrated units. Ensure the required hFE meets the minimum specification of 80 for the target operating conditions. Verify that the 50 V breakdown voltage and 100 mA current limits are sufficient for the specific load requirements.

Part Context

This component belongs to the DTC143 series of NPN digital transistors manufactured by onsemi. The series is engineered to simplify circuit design by combining transistor switching capabilities with precise biasing networks. It serves as a direct functional replacement for discrete BJT configurations requiring similar voltage and current ratings.

Replacement Considerations

Compatible substitutes include the ROHM DTC143ZE and the Rectron DTC143ZUA. When replacing, verify that the alternative package matches the footprint and that the internal resistor values (R1=4.7kΩ, R2=47kΩ) remain consistent to maintain circuit timing and bias stability.