BUL39D

Series:	--
Packaging:	Tube
Part Status:	Active
Transistor Type:	NPN
Current - Collector (Ic) (Max):	4A
Voltage - Collector Emitter Breakdown (Max):	450V
Vce Saturation (Max) @ Ib, Ic:	1.1V @ 500mA, 2.5A
Current - Collector Cutoff (Max):	100µA
DC Current Gain (hFE) (Min) @ Ic, Vce:	10 @ 10mA, 5V
Power - Max:	70W
Frequency - Transition:	--
Operating Temperature:	150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-220-3
Supplier Device Package:	TO-220AB

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A BUL39D is a kind of Silicon Controlled Rectifier (SCR), which is a type of semiconductor that can be used to switch an electrical circuit on or off in response to conditions within the circuit. SCRs are members of the bipolar junction transistor (BJT) family and the BUL39D is one of the most popular variants of SCRs. The BUL39D devices are typically used in a variety of applications, such as AC motor control, UPS Battery Chargers, Proximity Sensors, and Emergency Lighting. The main advantage of using BUL39D devices is that they are cheaper to purchase than other similar SCR devices, making them ideal for applications where cost is a factor. Moreover, the BUL39D devices are relatively easy to use and can be wired into an electrical circuit with minimal effort. BUL39D devices are basically three-layer semiconductor devices that are composed of a P-type semiconductor layer, an N-type semiconductor layer, and a gate. The P-type layer and the N-type layer provide the potential junctions between the gate and the two opposite-facing terminals, which are typically labeled as the “anode” and the “cathode.” The differential of the device, or the ratio between the anode and the cathode, usually ranges from 800 to 1200 volts. When the gate is given a positive charge, a current will flow from the anode to the cathode, and this is referred to as a “forward biased” condition. When the gate is given a negative charge, the current will not flow and this is referred to as a “reverse biased” condition. The main application of the BUL39D device is in AC motor control, where it is often used to control the speed and direction of a motor. This is possible thanks to the ability of the device to switch the motor on or off very quickly and with minimal energy consumption. This makes the BUL39D device ideal for applications where speed and efficiency is paramount. In addition to this, the BUL39D device is also used in UPS Battery Chargers, Proximity Sensors, and Emergency Lighting. For example, in Emergency Lighting, the device can be used to detect an emergency situation and switch on the emergency light automatically. In Proximity Sensors, the device can be used to detect objects in the proximity of an electrical system and switch on the relevant circuit. In general, the BUL39D device is a kind of low cost and efficient semiconductor device, which is used for a variety of applications. It carries the major advantage of being relatively easy to wire into a circuit, and it is highly reliable and robust in a variety of conditions. This makes it ideal for a number of different applications, from motor control to emergency lighting.

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