Dual pre-biased pair in a single UMT6 package
The Rohm UMD5NTR packs one NPN and one PNP pre-biased transistor into a 6-pin UMT6 surface-mount package. Each transistor integrates the bias resistors — the NPN side uses a 47 kΩ base resistor (R1) and a 47 kΩ emitter-base resistor (R2), while the PNP side uses a 4.7 kΩ base resistor and a 10 kΩ emitter-base resistor.
Ratings that decide the fit
Collector-emitter breakdown is rated at 50 V, so this part handles 12 V and 24 V industrial logic rails comfortably, and it can switch 48 V loads with margin. Maximum continuous collector current is 100 mA per transistor, which covers typical relay, LED, and small-signal solenoid drive. The 250 MHz transition frequency means it handles PWM switching into the low-MHz range without significant gain roll-off. Saturation voltage is specified at 300 mV maximum with a 500 µA base drive and 10 mA collector current — a clean low-side switch characteristic for logic-level loads. Total package dissipation is 150 mW for the NPN side and 120 mW for the PNP side, so derate if both transistors conduct continuously at high current in a warm enclosure.