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

305 Items

Mfr Part #	Quantity Available	UnitPrice	Packaging	Product Status	Voltage - Breakover	Current - Breakover	Current - Hold (Ih) (Max)	Current - Peak Output	Operating Temperature	Package / Case	Supplier Device Package
SODDB3T RHG DIAC-TRIGGER DIODE, 400MW, 34V V Taiwan Semiconductor Corporation	450	$0.46	Tape & Reel (TR)	Active	30 ~ 34V	15 µA	-	2 A	-40°C ~ 125°C (TJ)	SOD-123	SOD-123
BS08D-T112 SIDAC 7-9V 1A TO92 Powerex Inc.	284	$1.13	Cut Tape (CT)	Active	7 ~ 9V	200 µA	1.5 mA	1 A	-55°C ~ 125°C (TJ)	TO-226-3, TO-92-3 Short Body (Formed Leads)	TO-92
DB4 DIAC 35-45V 2A DO35 STMicroelectronics	642	$0.42	Tape & Reel (TR)	Active	35 ~ 45V	50 µA	-	2 A	-40°C ~ 125°C (TJ)	DO-204AH, DO-35, Axial	DO-35
K2500SRP SIDAC 240-280V 1A DO214 Littelfuse Inc.	213	$1.43	Tape & Reel (TR)	Active	240 ~ 280V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	DO-214AA, SMB	DO-214
K1200G SIDAC 110-125V 1A DO15 Littelfuse Inc.	398	$1.09	Bulk	Active	110 ~ 125V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	DO-204AC, DO-15, Axial	DO-15
K2400GRP SIDAC 220-250V 1A DO15 Littelfuse Inc.	271	$1.48	Tape & Reel (TR)	Active	220 ~ 250V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	DO-204AC, DO-15, Axial	DO-15
K2400G SIDAC 220-250V 1A DO15 Littelfuse Inc.	631	$1.42	Bulk	Active	220 ~ 250V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	DO-204AC, DO-15, Axial	DO-15
K2500G SIDAC 240-280V 1A DO15 Littelfuse Inc.	284	$1.39	Bulk	Active	240 ~ 280V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	DO-204AC, DO-15, Axial	DO-15
K1100E70RP2 SIDAC 104-118V 1A TO92 Littelfuse Inc.	1,214	$0.48	Tape & Reel (TR)	Active	104 ~ 118V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	TO-226-2, TO-92-2 (TO-226AC) (Formed Leads)	TO-92
K1100E70AP SIDAC 104-118V 1A TO92 Littelfuse Inc.	1,167	$0.46	Tape & Box (TB)	Active	104 ~ 118V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	TO-226-2, TO-92-2 (TO-226AC) (Formed Leads)	TO-92
K1100E70 SIDAC 104-118V 1A TO92 Littelfuse Inc.	30	$1.01	Bulk	Active	104 ~ 118V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	TO-226-2, TO-92-2 (TO-226AC)	TO-92
DB3 DIAC, 36V MAX, DO-204AH Fairchild Semiconductor	33,988	$0.02	Bulk	Obsolete	28 ~ 36V	50 µA	-	2 A	-40°C ~ 125°C (TJ)	DO-204AH, DO-35, Axial	DO-35
SMT10002T3 THYRISTOR SURGE PROTECTION DEVIC onsemi	32,208	$0.02	Bulk	Active	-	-	-	-	-	-	-
DB31 DIAC DO-35 30V 34V Diotec Semiconductor	4,563	$0.03	Tape & Reel (TR)	Active	30 ~ 34V	200 µA	-	2 A	-50°C ~ 100°C (TJ)	DO-204AH, DO-35, Axial	DO-35
DB32 DIAC DO-35 32V 36V Diotec Semiconductor	18,854	$0.03	Tape & Reel (TR)	Active	32 ~ 36V	200 µA	-	2 A	-50°C ~ 100°C (TJ)	DO-204AH, DO-35, Axial	DO-35
BR100-03LLD DIAC DO-213AA 28V 36V Diotec Semiconductor	11,795	$0.03	Tape & Reel (TR)	Active	28 ~ 36V	50 µA	-	2 A	-50°C ~ 100°C (TJ)	DO-213AA	DO-213AA, MINI-MELF
BR100-04LLD DIAC DO-213AA 35V 45V Diotec Semiconductor	4,504	$0.04	Tape & Reel (TR)	Active	35 ~ 45V	50 µA	-	2 A	-50°C ~ 100°C (TJ)	DO-213AA	DO-213AA, MINI-MELF
N413-T1-AZ DIAC TRIGGER DIODE Renesas Electronics America Inc	5,606	$0.17	Bulk	Active	-	-	-	-	-	-	-
K1500GRP SIDAC 140-170V 1A DO15 Littelfuse Inc.	419	$0.95	Tape & Reel (TR)	Active	140 ~ 170V	10 µA	150 mA	1 A	-40°C ~ 125°C (TJ)	DO-204AC, DO-15, Axial	DO-15
NTE6411 D-DIAC 40V +-5V 2A NTE Electronics, Inc	34	$1.13	Bag	Active	35 ~ 45V	25 µA	-	2 A	-40°C ~ 125°C (TJ)	Axial	-

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.