Thyristors - SCRs

Category Introduction

Silicon Controlled Rectifiers (SCRs) are three-terminal devices that behave like rectifier diodes, with an added ability to block current flow in the forward direction until a control signal is applied. Most commonly used for controlling AC utility power, SCRs are also known as thyristors, though this latter term is also sometimes applied to other related devices.

Product List

170 Items

Mfr Part #	Quantity Available	UnitPrice	Packaging	Product Status	Voltage - Off State	Voltage - Gate Trigger (Vgt) (Max)	Current - Gate Trigger (Igt) (Max)	Voltage - On State (Vtm) (Max)	Current - On State (It (AV)) (Max)	Current - On State (It (RMS)) (Max)	Current - Hold (Ih) (Max)	Current - Off State (Max)	Current - Non Rep. Surge 50, 60Hz (Itsm)	SCR Type	Operating Temperature	Mounting Type	Package / Case	Supplier Device Package
NYC0102BLT1G SCR 200V 250MA SOT23-3 Littelfuse Inc.	1,722	$0.43	Tape & Reel (TR)	Active	200 V	800 mV	200 µA	1.7 V	-	250 mA	6 mA	1 µA	7A @ 60Hz	Sensitive Gate	-40°C ~ 125°C	Surface Mount	TO-236-3, SC-59, SOT-23-3	SOT-23-3
MCR08MT1G SCR 600V 800MA SOT223 Littelfuse Inc.	1,143	$0.59	Tape & Reel (TR)	Active	600 V	800 mV	200 µA	1.7 V	-	800 mA	5 mA	10 µA	8A @ 60Hz	Sensitive Gate	-40°C ~ 110°C	Surface Mount	TO-261-4, TO-261AA	SOT-223
MCR12DSMT4G SCR 600V 12A DPAK Littelfuse Inc.	390	$1.03	Tape & Reel (TR)	Active	600 V	1 V	200 µA	1.9 V	7.6 A	12 A	6 mA	10 µA	100A @ 60Hz	Sensitive Gate	-40°C ~ 110°C	Surface Mount	TO-252-3, DPak (2 Leads + Tab), SC-63	TO-252, (D-Pak)
TS420-600B-TR SCR 600V 4A DPAK STMicroelectronics	397	$1.46	Tape & Reel (TR)	Active	600 V	800 mV	200 µA	1.6 V	2.5 A	4 A	5 mA	5 µA	30A, 33A	Sensitive Gate	-40°C ~ 125°C	Surface Mount	TO-252-3, DPak (2 Leads + Tab), SC-63	DPAK
TYN1225RG SCR 1.2KV 25A TO220AB STMicroelectronics	219	$3.38	Tube	Active	1.2 kV	1.5 V	40 mA	1.6 V	16 A	25 A	50 mA	5 µA	250A, 260A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-220-3	TO-220
BT169D-L,116 SCR 400V 800MA TO92-3 WeEn Semiconductors	19	$0.41	Tape & Reel (TR)	Active	400 V	800 mV	50 µA	1.7 V	500 mA	800 mA	1 mA	2 µA	8A, 9A	Sensitive Gate	125°C (TJ)	Through Hole	TO-226-3, TO-92-3 (TO-226AA) Formed Leads	TO-92-3
X0202MN 5BA4 SCR 600V 1.25A SOT223 STMicroelectronics	1,140	$0.61	Tape & Reel (TR)	Active	600 V	800 mV	200 µA	1.45 V	800 mA	1.25 A	5 mA	5 µA	22.5A, 25A	Sensitive Gate	-40°C ~ 125°C	Surface Mount	TO-261-4, TO-261AA	SOT-223
XL0840 SCR 400V 800MA TO92-3 STMicroelectronics	1,314	$0.54	Bulk	Active	400 V	800 mV	200 µA	1.95 V	500 mA	800 mA	5 mA	1 µA	7A, 8A	Sensitive Gate	-40°C ~ 125°C	Through Hole	TO-226-3, TO-92-3 (TO-226AA)	TO-92-3
MCR12DCMT4G SCR 600V 12A DPAK Littelfuse Inc.	481	$1.00	Tape & Reel (TR)	Active	600 V	1 V	20 mA	1.9 V	7.8 A	12 A	40 mA	10 µA	100A @ 60Hz	Standard Recovery	-40°C ~ 125°C	Surface Mount	TO-252-3, DPak (2 Leads + Tab), SC-63	TO-252, (D-Pak)
X0202NN 5BA4 SCR 800V 1.25A SOT223 STMicroelectronics	761	$1.15	Tape & Reel (TR)	Active	800 V	800 mV	200 µA	1.45 V	800 mA	1.25 A	5 mA	5 µA	22.5A, 25A	Sensitive Gate	-40°C ~ 125°C	Surface Mount	TO-261-4, TO-261AA	SOT-223
2N5061 PBFREE SCR 60V 800MA TO92 Central Semiconductor Corp	1,498	$0.62	Bulk	Active	60 V	800 mV	200 µA	1.7 V	-	800 mA	5 mA	1 µA	-	Sensitive Gate	-40°C ~ 125°C	Through Hole	TO-226-3, TO-92-3 (TO-226AA)	TO-92-3
BT151-650LTNQ SCR 650V 12A TO220AB WeEn Semiconductors	1,180	$0.63	Tube	Active	650 V	1 V	5 mA	1.5 V	7.5 A	12 A	20 mA	1 mA	120A, 132A	Sensitive Gate	150°C (TJ)	Through Hole	TO-220-3	TO-220AB
BT151-500R,127 SCR 500V 12A TO220AB WeEn Semiconductors	751	$0.63	Tube	Active	500 V	1.5 V	15 mA	1.75 V	7.5 A	12 A	20 mA	500 µA	120A, 132A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-220-3	TO-220AB
C106DG SCR 400V 4A TO225AA Littelfuse Inc.	507	$0.65	Bulk	Active	400 V	800 mV	200 µA	2.2 V	2.55 A	4 A	3 mA	10 µA	20A @ 60Hz	Sensitive Gate	-40°C ~ 110°C	Through Hole	TO-225AA, TO-126-3	TO-225AA
BT151-500RT,127 SCR 500V 12.5A TO220AB WeEn Semiconductors	192	$0.73	Tube	Active	500 V	1.5 V	15 mA	1.75 V	8 A	12.5 A	20 mA	500 µA	120A, 132A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-220-3	TO-220AB
MCR106-8G SCR 600V 4A TO225AA Littelfuse Inc.	382	$0.75	Bulk	Active	600 V	1 V	200 µA	2 V	2.55 A	4 A	5 mA	10 µA	25A @ 60Hz	Sensitive Gate	-40°C ~ 110°C	Through Hole	TO-225AA, TO-126-3	TO-225AA
MCR310-10G SCR 800V 10A TO220AB Littelfuse Inc.	375	$1.52	Bulk	Active	800 V	1.5 V	200 µA	2.2 V	-	10 A	6 mA	500 µA	100A @ 60Hz	Sensitive Gate	-40°C ~ 110°C	Through Hole	TO-220-3	TO-220AB
MCR69-3G SCR 100V 25A TO220AB Littelfuse Inc.	402	$1.62	Tube	Active	100 V	1.5 V	30 mA	1.8 V	16 A	25 A	50 mA	10 µA	300A @ 60Hz	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-220-3	TO-220AB
TYN608RG SCR 600V 8A TO220AB STMicroelectronics	309	$1.66	Tube	Active	600 V	1.3 V	15 mA	1.6 V	5 A	8 A	30 mA	5 µA	95A, 100A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-220-3	TO-220
TYN640RG SCR 600V 40A TO220AB STMicroelectronics	229	$3.61	Tube	Active	600 V	1.3 V	35 mA	1.6 V	25 A	40 A	75 mA	5 µA	460A, 480A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-220-3	TO-220

About Silicon-Controlled Rectifiers (SCRs)

What are Silicon-Controlled Rectifiers (SCRs)?

Silicon-Controlled Rectifiers (SCRs)

Silicon-Controlled Rectifiers (SCRs) are a type of semiconductor device that functions as a switch to control and rectify current flow in electrical circuits. They are a subset of thyristors and are primarily used to convert alternating current (AC) to direct current (DC). An SCR operates by allowing current to flow only when a gate signal is applied, effectively acting as a switch that can be turned on by a small control signal. Once activated, the SCR remains in the conducting state until the current flowing through it drops below a certain threshold, known as the holding current. This characteristic makes SCRs ideal for controlling high power in various applications.

Types of Silicon-Controlled Rectifiers (SCRs)

1. Standard SCRs

Standard SCRs are the most common type, used in applications where the switching speed is not a critical factor. They are designed to handle high voltage and current levels, making them suitable for general-purpose rectification and power control in industrial settings.

2. Fast Switching SCRs

Fast switching SCRs are designed for applications requiring rapid switching speeds. They are used in circuits where the load changes quickly, such as in motor control and phase control applications. These SCRs have a lower turn-off time compared to standard SCRs, allowing for more precise control.

3. Light-Activated SCRs (LASCRs)

Light-Activated SCRs are triggered by light rather than an electrical gate signal. This makes them ideal for applications where electrical isolation is necessary, such as in high-voltage environments or where electromagnetic interference is a concern.

4. Reverse Blocking SCRs

Reverse Blocking SCRs are designed to block reverse voltage, making them suitable for applications where the device might be exposed to reverse polarity. They are commonly used in circuits where reverse voltage protection is critical.

How to choose Silicon-Controlled Rectifiers (SCRs)?

When selecting an SCR, several key parameters must be considered to ensure optimal performance and reliability:

Voltage Rating: Choose an SCR with a voltage rating that exceeds the maximum voltage in your application to prevent breakdown.
Current Rating: Ensure the SCR can handle the maximum current load without overheating.
Gate Trigger Current: Select an SCR with a gate trigger current that matches your control circuit's capabilities.
Switching Speed: Consider the turn-on and turn-off times, especially for applications requiring rapid switching.
Thermal Management: Evaluate the thermal resistance and ensure adequate heat dissipation mechanisms are in place.

To assess product quality and reliability, review supplier certifications, customer reviews, and performance testing data. Environmental factors such as temperature, humidity, and potential exposure to corrosive substances should also be considered during installation to ensure longevity and reliability.

Applications of Silicon-Controlled Rectifiers (SCRs)

1. Industrial Motor Control

SCRs are widely used in industrial motor control applications to regulate the speed and torque of AC and DC motors. They provide precise control over motor operation, enhancing efficiency and performance in manufacturing processes.

2. Power Conversion

In power conversion systems, SCRs are employed to convert AC to DC, facilitating the operation of various electronic devices and systems. They are crucial in power supply units and battery charging systems.

3. Lighting Control

SCRs are used in dimmer switches and lighting control systems to adjust the brightness of incandescent and halogen lamps. They enable smooth and efficient control of lighting levels in residential and commercial settings.

4. Heating Systems

In electric heating systems, SCRs are used to control the power delivered to heating elements, allowing for precise temperature regulation. This application is common in industrial furnaces and domestic heating appliances.

5. Overvoltage Protection

SCRs are employed in overvoltage protection circuits to safeguard sensitive electronic equipment from voltage spikes. They act as a protective switch, diverting excess voltage away from critical components.