Digital Transistors: One Package, Three Components
A digital transistor integrates a transistor plus one or two bias resistors in a single package.
How They Work
- R1 only (base resistor): limits base current
- R1 + R2: also provides off-state pull-down for noise immunity
Common Part Numbers
Examples: LMUN5235DW1T1G (SC-88, 50V, 100mA), DTC series from Rohm, PDTC from NXP.
Where to Use
- GPIO driving loads from MCUs
- LED, buzzer, relay coil drivers
- Space-constrained designs