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

4566 Items

Mfr Part #	Quantity Available	UnitPrice	Series	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.	1,082	$0.42		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.	864	$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
S6X8BSRP SCR 600V 800MA SOT89 Littelfuse Inc.	823	$0.78		Tape & Reel (TR)	Active	600 V	800 mV	200 µA	1.7 V	510 mA	800 mA	5 mA	3 µA	8A, 10A	Sensitive Gate	-40°C ~ 125°C	Surface Mount	TO-243AA	SOT-89
MCR708AT4G SCR 600V 4A DPAK Littelfuse Inc.	788	$0.84		Tape & Reel (TR)	Active	600 V	800 mV	75 µA	2.2 V	1.6 A	4 A	5 mA	10 µA	25A @ 60Hz	Sensitive Gate	-40°C ~ 110°C	Surface Mount	TO-252-3, DPak (2 Leads + Tab), SC-63	TO-252, (D-Pak)
S602TSRP SCR 600V 1.5A SOT223 Littelfuse Inc.	15	$0.93		Tape & Reel (TR)	Active	600 V	800 mV	200 µA	1.7 V	950 mA	1.5 A	5 mA	5 µA	12.5A, 15A	Sensitive Gate	-40°C ~ 125°C	Surface Mount	TO-261-4, TO-261AA	SOT-223
MCR8DSMT4G SCR 600V 8A DPAK Littelfuse Inc.	130	$1.13		Tape & Reel (TR)	Active	600 V	1 V	200 µA	1.8 V	5.1 A	8 A	6 mA	10 µA	90A @ 60Hz	Sensitive Gate	-40°C ~ 110°C	Surface Mount	TO-252-3, DPak (2 Leads + Tab), SC-63	TO-252, (D-Pak)
MCR12DSMT4G SCR 600V 12A DPAK Littelfuse Inc.	653	$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)
C106M1G SCR 600V 4A TO225AA Littelfuse Inc.	679	$0.64		Bulk	Active	600 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
TS420-600B-TR SCR 600V 4A DPAK STMicroelectronics	214	$1.49		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
MCR106-6G SCR 400V 4A TO225AA Littelfuse Inc.	134	$0.75		Bulk	Active	400 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
S8016NRP SCR 800V 16A TO263 Littelfuse Inc.	15	$2.66	Teccor®	Tape & Reel (TR)	Active	800 V	1.5 V	30 mA	1.6 V	10 A	16 A	40 mA	20 µA	188A, 225A	Standard Recovery	-40°C ~ 125°C	Surface Mount	TO-263-3, D²Pak (2 Leads + Tab), TO-263AB	TO-263 (D2Pak)
S4025LTP SCR 400V 25A TO220 Littelfuse Inc.	290	$2.79		Tube	Active	400 V	1.5 V	35 mA	1.6 V	16 A	25 A	50 mA	10 µA	300A, 350A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-220-3 Isolated Tab	TO-220 Isolated Tab
S6025LTP SCR 600V 25A TO220 Littelfuse Inc.	17	$2.99		Tube	Active	600 V	1.5 V	35 mA	1.6 V	16 A	25 A	50 mA	10 µA	300A, 350A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-220-3 Isolated Tab	TO-220 Isolated Tab
S6055NRP SCR 600V 55A TO263 Littelfuse Inc.	118	$5.14		Tape & Reel (TR)	Active	600 V	1.5 V	40 mA	1.8 V	35 A	55 A	60 mA	10 µA	550A, 650A	Standard Recovery	-40°C ~ 125°C	Surface Mount	TO-263-3, D²Pak (2 Leads + Tab), TO-263AB	TO-263 (D2Pak)
TYN1225RG SCR 1.2KV 25A TO220AB STMicroelectronics	72	$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
S6065KTP SCR 600V 65A TO218 Littelfuse Inc.	11	$8.92		Tube	Active	600 V	2 V	50 mA	1.8 V	41 A	65 A	80 mA	20 µA	800A, 950A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-218-3 Isolated Tab, TO-218AC	TO-218 Isolated Tab
S8065KTP SCR 800V 65A TO218 Littelfuse Inc.	53	$9.64		Tube	Active	800 V	2 V	50 mA	1.8 V	41 A	65 A	80 mA	20 µA	800A, 950A	Standard Recovery	-40°C ~ 125°C	Through Hole	TO-218-3 Isolated Tab, TO-218AC	TO-218 Isolated Tab
VS-50RIA120 SCR 1.2KV 80A TO208AC Vishay General Semiconductor - Diodes Division	31	$25.73		Bulk	Active	1.2 kV	2.5 V	100 mA	1.6 V	50 A	80 A	200 mA	15 mA	1430A, 1490A	Standard Recovery	-40°C ~ 125°C	Chassis, Stud Mount	TO-208AC, TO-65-3, Stud	TO-208AC (TO-65)
IXHX40N150V1HV SCR 1.5KV TO247PLUS-HV IXYS	20	$39.68		Tube	Active	1.5 kV	-	-	-	-	-	-	-	-	Standard Recovery	-55°C ~ 150°C	Through Hole	TO-247-3 Variant	TO-247PLUS-HV
VS-ST380CH06C0 SCR 600V 2220A TO200AB Vishay General Semiconductor - Diodes Division	6	$120.57		Bulk	Active	600 V	3 V	200 mA	1.58 V	960 A	2220 A	600 mA	100 mA	12500A, 13000A	Standard Recovery	-40°C ~ 150°C	Chassis Mount	TO-200AB, E-PUK	TO-200AB (E-Puk)

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.