This document introduces the applications and features of the 100mA / 50V digital transistors (with built-in resistors) DTC123EM / DTC123EE / DTC123EUA / DTC123EKA produced by ROHM. The product has built-in bias resistors, which allow the configuration of an inverter circuit without connecting external input resistors. The bias resistors consist of thin-film resistors with complete isolation, enabling negative biasing of the input and almost completely eliminating parasitic effects. The device design is made easy as only the on/off conditions need to be set for operation.
The DTC123 series are 100 mA / 50 V NPN digital transistors with built‑in bias resistors, allowing inverter circuits to be built without external input resistors. The devices feature thin‑film resistors with full isolation, enabling negative biasing and minimizing parasitic effects.
These transistors are intended for inverter, interface and driver applications and are supplied in VMT3, EMT3, UMT3 and SMT3 tape packages. The sheet provides absolute maximum ratings, electrical characteristics, and typical application circuits.
| Supply voltage (VEO) | 50 V |
|---|---|
| Output current (Iout) | 100 mA |
| Power dissipation (Pd) | 150‑200 mW |
| Junction temperature (Tj) | 150 °C |
| Storage temperature (Tstg) | -55 °C to +150 °C |
| Transition frequency (fT) | 250 MHz |
| Input resistance (Ri) | 2.2 kΩ |
| DC current gain (Gi) | 20 |
The devices can tolerate a supply voltage up to 50 V.
Each transistor is rated for a continuous output current of 100 mA.
They are intended for inverter, interface and driver circuits.
The built‑in bias resistors eliminate the need for external input resistors, allowing inverter circuits to be configured without additional components.