BD678

$0.24

Description：TRANS PNP DARL 60V 4A TO-126
Series：-

SKU:4083d2d1d5d7 Category: Single Bipolar Transistors Brand: onsemi

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Product introduction

Product Detailed Parameters

Description：TRANS PNP DARL 60V 4A TO-126
Series：-
Mfr：onsemi
Package：Bulk
Transistor Type：PNP - Darlington
Current - Collector (Ic) (Max)：4:00 AM
Voltage - Collector Emitter Breakdown (Max)：60 V
Vce Saturation (Max) @ Ib, Ic：2.5V @ 30mA, 1.5A
Current - Collector Cutoff (Max)：500µA
DC Current Gain (hFE) (Min) @ Ic, Vce：750 @ 1.5A, 3V
Power - Max：40 W
Frequency - Transition：-
Operating Temperature：-55°C ~ 150°C (TJ)
Mounting Type：Through Hole
Package / Case：TO-225AA, TO-126-3
Supplier Device Package：TO-126
Grade：-
Qualification：-

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BD678

Overview

The BD678G is a plastic medium-power silicon PNP Darlington transistor manufactured by onsemi. It features a monolithic construction and is designed for complementary general-purpose amplifier applications. The device supports a collector-emitter voltage of 60 Vdc, a continuous collector current of 4.0 Adc, and a total device dissipation of 40 W at 25°C case temperature. Key electrical characteristics include a minimum DC current gain (hFE) of 750 at specified currents, a collector-emitter saturation voltage of 2.5 Vdc, and a base-emitter on voltage of 2.5 Vdc. It operates within a junction temperature range of -55 to +150°C.

Feature Summary

Monolithic construction with high DC current gain
Complementary design suitable for general-purpose amplifiers
Pb-Free package compliant with RoHS standards

Applications

Output devices in complementary general-purpose amplifier applications

Procurement Notes

Verify the specific suffix (e.g., G or AG) against the datasheet to confirm lead-free status and exact voltage ratings. Confirm availability as some variants may be discontinued. Ensure thermal management meets the 40W dissipation requirement at the intended operating temperature. Validate that the TO-225 package style matches the PCB footprint requirements.

Selection Notes

Select this component when a PNP Darlington configuration with high current gain is required for power switching or amplification. Compare the 60V rating against system voltage peaks. Consider the thermal resistance of 3.13°C/W for heat sink calculations. Verify compatibility with complementary NPN counterparts like the BD677 if building push-pull stages.

Part Context

The BD678G belongs to a series of plastic medium-power silicon PNP Darlingtons from onsemi. It is part of a family including BD676, BD680, and BD682, which share similar packaging but differ in voltage ratings. This series is often used in audio and motor control circuits where high current drive capability is needed.