C438PD

Series:	--
Packaging:	--
Part Status:	Active
Current - Non Rep. Surge 50, 60Hz (Itsm):	--
SCR Type:	Standard Recovery
Operating Temperature:	--
Mounting Type:	--
Package / Case:	--
Supplier Device Package:	--

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Thyristors - SCRs

Thyristors are a type of semiconductor device comprised of four layers of alternating P-type (positive for majority carriers) and N-type (negative for majority carriers) materials. They are most commonly used in semiconductor switching mechanisms, controlling the current in electronic electrical circuits. One of the most common varieties of thyristors is the Silicon Controlled Rectifier (SCR). An SCR works using Positive Temperature Coefficient (PTC) elements to control current which, in turn, controls the output of power supplies. A closely related device is the C438PD thyristor, a four-layer device utilizing PNPN junctions to control the current in a circuit.

C438PD Application Field and Working Principle

The C438PD thyristor is a low power device intended for switch-mode power supplies and switching applications. The device is available in a two-pin package, housed in a TO-220 case. It has an on-state voltage drop of less than 1V with a short turn-off delay of 10μs. In addition, it has an operating temperature range of -55° to +150°C.The C438PD is a PNPN thyristor which utilizes the three layers of alternating P-type and N-type materials to control current in a circuit. When a current passes through the PN junction, it triggers a change of state, allowing current to flow through the circuit and generating a voltage pulse. This pulse can then be regulated or modified by a gate signal, allowing the current to be switched ON and OFF as required.The C438PD is capable of regulating up to 12A of current, offering a rapid turn-on and turn-off time of 10μs. This makes it suitable for applications such as lamp brightness dimming, DC motor speed control, and frequency regulation. The device also has some immunity to temperature variations and a dielectric strength of 1.5V free from short circuits.The C438PD also has a manufactured tolerance of ± 25 mV, giving it the desired regulation and protection from overshoot and undershoot, thus allowing it to better control current. In addition, it also offers a low output resistance, allowing for a high level of accuracy and better control of current.The C438PD is ideal for use in low-voltage, low-power applications such as switch mode power supplies, motor drives, and converters. Its low on-state voltage drop, short turn-off delay, and wide temperature range make it a great choice for these types of applications. Its low output resistance also allows for better control of current, providing the desired accuracy and protection.In conclusion, the C438PD thyristor is an excellent choice for a variety of low-voltage, low-power semiconductor switching applications, offering a variety of features that make it well suited for these applications. It offers low on-state voltage drop, short turn-off delay, temperature tolerance, dielectric strength, and manufactured tolerance, allowing it to provide the desired accuracy and protection. In addition, its low output resistance also allows for better control of current, making it a great choice for switch mode power supplies, motor drives, and other low-voltage, low-power applications.

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