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diotec (Diotec Semiconductor AG)

Diotec Semiconductor AG

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Jul 10, 2026

MMDTC143HP - Digital Transistor in Tiny DFN1006-3/SOT-883 Case Outline

50 V / 100 mA NPN with Integrated 4.7 / 47 kΩ Bias Resistors for Industrial Level SensorsIn an industrial level sensor, a digital NPN transistor acts as a switch that responds to a signal from the sensor. When the liquid level reaches a certain point, the sensor activates the transistor by sending a small base current, causing it to switch to the on state and enabling it to control larger loads such as relays or pumps.

The resistors, particularly the 4.7 kΩ current-limiting resistor and the 47 kΩ pull-down resistor, are critical for the stability of the circuit. The 4.7 kΩ resistor protects the transistor from overload, while the 47 kΩ resistor ensures that the transistor remains in the off state when no signal is present. This configuration ensures reliable and precise operation of the level sensor in industrial applications.

Diotec's MMDTC143HP is a digital NPN transistor containing both resistors in a tiny DFN1006/SOT883 case outline. It measures just 1.0 x .06 mm² at a total height of just 0.38 mm. This allows design engineers to build smallest level sensors.

Features:

  • Digital NPN transistor

  • 4.7 kΩ input, 47 kΩ Base-Emitter resistor

  • Tiny case outline

Applications:

  • Industrial level sensor

  • Signal processing

  • Switching

  • LED drivers

  • Relay drivers

  • Control Circuits

Specifications:

  • 100 mA DC collector current (IC)

  • 50 V collector-emitter voltage (VCEO)

  • Minimum DC current gain of 15 (GI)

  • Power dissipation 250 mW at 25°C (Ptot)

  • DFN1006-3/SOT-883 case outline