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BD681

PNP Darlington, -80V, -4A, hFE>750, SOT-32, complement to BD682

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Manufacturer Part：

BD681

Package：

SOT-32 / TO-126 (5.4 x 6.2 x 2.3 mm, tab=collector)

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Description

Product Overview

The BD681 from STMicroelectronics is a PNP Darlington power transistor in a SOT-32 (TO-126) package. Rated at -80V VCEO and -4A continuous collector current with a minimum DC current gain (hFE) of 750 at IC=2A. Designed for medium-power switching and amplification in industrial and consumer applications. Complementary pair with BD682 (NPN).

Key Specifications

Polarity PNP Darlington
VCEO -80V
IC (Continuous) -4A
IC (Peak) -6A
hFE (min) @ IC=2A 750
VCE(sat) max -1.5V @ IC=2A, IB=8mA
VBE(on) max -1.8V @ IC=3A
Power Dissipation 40W (TC=25 C)
Operating Temperature -65 to 150 C
Package SOT-32 (TO-126)

Features

  • PNP Darlington configuration
  • High current gain: hFE > 750 at 2A
  • 80V collector-emitter voltage
  • 4A continuous, 6A peak current
  • 40W power dissipation (with heatsink)
  • Internal base-emitter resistors for stability
  • Complementary pair with BD682 (NPN)

Applications

  • Medium-power switching (relays, solenoids, motors)
  • Audio output amplifiers
  • Lamp and LED drivers
  • Power supply regulators
  • Heater and actuator control

The BD681 from ST is a PNP Darlington power transistor rated at -80V, -4A in SOT-32 (TO-126) package. The Darlington configuration provides hFE > 750 at IC=2A, enabling direct drive from low-current logic. Internal base-emitter resistors ensure thermal stability. Complementary pair with BD682 (NPN). Suitable for medium-power switching, motor control, and audio amplification.

The Darlington configuration cascades two PNP transistors: the first (driver) collector feeds the second (output) base. The combined current gain is the product of both transistor hFE values, yielding >750. Internal base-emitter shunt resistors prevent leakage current from turning on the output transistor and improve switching speed by providing a discharge path for stored base charge. VCE(sat) is higher (~1.5V) than a single transistor due to the two VBE drops.

Pin Name Type Function
1 Base Input Darlington base input
2 Collector Output Collector (heatsink tab)
3 Emitter Output Emitter
  • Motor H-bridge high-side PNP switch driven directly from MCU GPIO
  • Relay and solenoid driver with high gain
  • Audio amplifier output stage (complementary with BD682)
  • LED/lamp driver for high-current loads
  • Linear voltage regulator pass element
Manufacturer Part Number Package Notes
ST BD682 SOT-32 NPN complementary Darlington
onsemi TIP127 TO-220 PNP Darlington, -5A, TO-220
ST BD681G SOT-32 Lead-free variant
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