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Thyristors - DIACs, SIDACs

Category Introduction

Products in the DIAC and SIDAC family are two-terminal devices most commonly used as triggering mechanisms in AC phase control applications. They act to oppose current flow until the voltage applied across them reaches some critical value, at which point current flow through them increases significantly. The two differ in the shape of their characteristic curves; DIACs (Diodes for Alternating Current) generally exhibit higher forward voltages in their conductive mode, and thus tend to be less suitable than SIDACs (Silicon Diode for Alternating Current) when substantial current flow is an application requirement.

Product List

7 Items
PDF Mfr Part # Quantity
Available		 UnitPrice RFQ Series Packaging Product StatusVoltage - BreakoverCurrent - BreakoverCurrent - Hold (Ih) (Max)Current - Peak OutputOperating TemperaturePackage / CaseSupplier Device Package
DB3TG
DB3TG
DIAC 30-34V 2A DO35
STMicroelectronics
 1,825 $0.41
Tape & Reel (TR) Active30 ~ 34V15 µA-2 A-40°C ~ 125°C (TJ)DO-204AH, DO-35, AxialDO-35
TMMDB3
TMMDB3
DIAC 28-36V 2A MINIMELF
STMicroelectronics
 1,661 $0.59
Tape & Reel (TR) Active28 ~ 36V50 µA-2 A-40°C ~ 125°C (TJ)DO-213AAMini MELF
SMDB3
SMDB3
DIAC 28-36V 1A SOT23-3
STMicroelectronics
 31 $0.80
Tape & Reel (TR) Active28 ~ 36V10 µA-1 A-40°C ~ 125°C (TJ)TO-236-3, SC-59, SOT-23-3SOT-23-3
TMMDB3TG
TMMDB3TG
DIAC 30-34V 2A MINIMELF
STMicroelectronics
 384 $0.63
Tape & Reel (TR) Active30 ~ 34V15 µA-2 A-40°C ~ 125°C (TJ)DO-213AAMini MELF
LLDB3-TP
LLDB3-TP
DIAC 28-36V 2A MINIMELF
Micro Commercial Co
 557 $0.00
Tape & Reel (TR) Obsolete28 ~ 36V50 µA-2 A-40°C ~ 125°C (TJ)DO-213AC, MINI-MELF, SOD-80Mini MELF
DB3TG-AP
DB3TG-AP
DIAC BIDIRECTIONAL DO-35G
Micro Commercial Co
 232 $0.00
Tape & Box (TB) Obsolete30 ~ 34V15 µA-2 A-40°C ~ 125°C (TJ)DO-204AH, DO-35, AxialDO-35G
DB3TG-TP
DB3TG-TP
DIAC BIDIRECTIONAL DO-35G
Micro Commercial Co
 447 $0.00
Tape & Reel (TR) Obsolete30 ~ 34V15 µA-2 A-40°C ~ 125°C (TJ)DO-204AH, DO-35, AxialDO-35G

About Thyristors - DIACs, SIDACs

What are Thyristors - DIACs, SIDACs?

Thyristors - DIACs, SIDACs

Thyristors, a class of semiconductor devices, are pivotal in controlling and converting electrical power. Among these, DIACs (Diode for Alternating Current) and SIDACs (Silicon Diode for Alternating Current) are specialized types that facilitate the regulation of AC power. These devices operate by switching from a non-conductive to a conductive state when a certain voltage threshold is exceeded, allowing them to control the flow of electrical current. DIACs are typically used to trigger TRIACs, while SIDACs are used for over-voltage protection and in high-voltage switching applications. Their ability to handle high voltages and currents makes them essential in various electronic circuits.

Types of Thyristors - DIACs, SIDACs

DIACs

DIACs are bidirectional devices that conduct current only after their breakover voltage has been reached. They are primarily used in triggering applications, such as in light dimmers and motor speed controls, where they help initiate the conduction of TRIACs. The symmetrical switching characteristic of DIACs ensures that the TRIAC is triggered at the same voltage level in both directions, providing consistent performance.

SIDACs

SIDACs are similar to DIACs but are designed to handle higher voltages and currents. They are often used in over-voltage protection circuits and in applications requiring high-voltage switching. SIDACs remain non-conductive until the applied voltage exceeds their breakover threshold, at which point they switch to a conductive state, allowing current to pass through. This makes them ideal for protecting circuits from voltage spikes and surges.

How to choose Thyristors - DIACs, SIDACs?

When selecting DIACs or SIDACs, several key parameters must be considered:

  • Breakover Voltage: Choose a device with a breakover voltage suitable for your application to ensure proper triggering and protection.
  • Current Rating: Ensure the device can handle the maximum current expected in your application to prevent damage.
  • Power Dissipation: Consider the power dissipation capacity to avoid overheating and ensure reliable operation.
  • Environmental Conditions: Evaluate the operating temperature range and environmental factors such as humidity and vibration that may affect performance.
  • Supplier Reliability: Assess the quality and reliability of different suppliers by reviewing product specifications, certifications, and customer feedback.

Proper installation is crucial, including ensuring adequate heat dissipation and protection against environmental factors to maintain device longevity and performance.

Applications of Thyristors - DIACs, SIDACs

Consumer Electronics

In consumer electronics, DIACs and SIDACs are used in light dimmers, fan speed controllers, and other devices requiring precise control of AC power. They help ensure smooth operation and energy efficiency.

Industrial Automation

In industrial settings, these devices are employed in motor speed controls and power regulation systems. Their ability to handle high voltages and currents makes them ideal for controlling large machinery and equipment.

Telecommunications

In telecommunications, SIDACs are used for over-voltage protection in communication lines, safeguarding sensitive equipment from voltage spikes and surges.

Renewable Energy Systems

In renewable energy systems, such as solar and wind power, DIACs and SIDACs help manage power conversion and distribution, ensuring efficient energy utilization and protection against over-voltage conditions.

Automotive Industry

In the automotive industry, these devices are used in ignition systems and other electronic control units, providing reliable switching and protection against electrical faults.