Built-in bias resistors enable the configuration of an inverter circuit without connecting external input resistors(see equivalent circuit).
The bias resistors consist of thin-film resistors with complete isolation to allow negative biasing of the input. They also have the advantage of almost completely eliminating parasitic effects.
Only the on/off conditions need to be set for operation, making device design easy.
Datasheets by Manufacturer
DTC144EUA — SeCoS Halbleitertechnologie GmbH — NPN Digital Transistors
DTC144EUA — ROHM — NPN 100mA 50V Digital Transistor
DTC144EUA — Micro Commercial Components — NPN Digital Transistors