This Product Selection Guide contains information to help select products in the Thyristors - SCR Modules category on DigiKey.com
Products within the Silicon Controlled Rectifier (SCR) module family incorporate two or more SCR devices within a single device package, or a single SCR with one or more other devices, such as a rectifier diode. Commonly used for control of AC utility power, SCRs (also called thyristors) behave like a common rectifier diode, with an added ability to restrict current flow in the forward direction until a control pulse is applied.
SelectionCharacteristics
Specifications to determine which SCR Module is right for your application.
Structure: Describes the electrical configuration of the devices incorporated into a module.
Number of SCRs, Diodes: The quantity of semiconductor devices contained within the module.
Voltage - Off State Indicates the maximum instantaneous voltage that may be repetitively/continuously applied to a device in a non-conducting state without causing damage.
Current - On State (It (AV)) (Max): The maximum allowable time-averaged current flow through a device, when conducting for half of a sinusoidal AC waveform at a manufacturer-specified device temperature.
Current - On State (It (RMS)) (Max): The rated maximum RMS (root mean square) current carrying capacity of a device, typically specified for sinusoidal current waveforms at 50/60 Hz.
Voltage - Gate Trigger (Vgt) (Max): The maximum voltage required to produce the listed gate trigger current. Measured under manufacturer-defined test conditions.
Current - Gate Trigger (Igt) (Max) The maximum current that must be passed through a device’s gate terminal to guarantee a device will trigger into conduction. Measured under manufacturer-defined test conditions.
Current - Non Rep. Surge 50, 60Hz (Itsm): The maximum current a device is rated to conduct for a single half-cycle of an AC waveform of a specified frequency. Values shown for 50 and 60 Hz, or as indicated.
Current - Hold (Ih) (Max): Characterizes the minimum current flow through a device required to maintain a conductive state.
Operating Temperature: Recommended operating temperature, typically given in a range or as a maximum. Exceeding these temperatures may affect performance or damage the device and other system components.
Mounting Type: Indicates how the device is attached.
Avalable Mounting Types
Chassis Mount
Designed to be mounted to a metal chassis.
Chassis Mount, 8" Wire Lead
Attaches to a metal chassis but it includes an 8" wire for connection.
Chassis, Stud Mount
Designed to be mounted to metal studs on a Chassis.
Screw Mount
Attaches using screw terminals.
Surface Mount
Have pins or pads that connect to solder pads on the PCB that are then soldered in place forming an electrical and mechanical connection. Number in front of SMD indicates how many pins/pads, for example a 6-SMD module has 6 pins/pads. May not use or even have all the pins/pads for example 24-SMD module, 14 leads: would fit in the space of a 24-SMD module but only has 14 pins/pads. Typically, they are smaller than the through-hole components.
There are three basic types of pins (leads) for surface mount devices.
Lead Types
Gull wing leads: Enable the most pins per inch when compared to J-lead types but they are more fragile. Easy to inspect for defects after soldering.
J-Leads: Less pins per inch than gull wing leads but they are stronger and less susceptible to breakage.
Flat Leads: Must be protectively packaged to prevent damage to leads. Leads must be formed into a gull shape prior to use with a separate piece of equipment. Due to that they are the least popular type of lead.
Through-hole
Have leads that go through a pre-drilled hole on a PCB and are soldered in place forming both an electrical and a mechanical connection.
Package / Case: Indicates the type of protective case used on an electronic component to allow easy handling, installation, and protection. This selection was determined to be the closest industry standard applicable to the suppliers device packaging. Typically it is best to check the actual dimensions from the datasheet rather than depend on this terminology when designing your circuit.
ProductExamples
| MFR PART # | MCC312-16IO1 |
|---|---|
| DIGI-KEY PART # | MCC312-16IO1-ND |
| MANUFACTURER | IXYS |
| DESCRIPTION | SCR Module 1.6 kV 520 A Series Connection - All SCRs Chassis Mount Y1-CU |
| DATASHEET | Click Here |
| MFR PART # | STTD6050H-12M2Y |
|---|---|
| DIGI-KEY PART # | 497-STTD6050H-12M2YTR-ND - Tape & Reel (TR) |
| MANUFACTURER | STMicroelectronics |
| DESCRIPTION | SCR Module 1.2 kV 60 A Bridge, Single Phase - SCRs/Diodes (Layout 1) Surface Mount 9-PowerSMD |
| DATASHEET | Click Here |
| MFR PART # | L312F |
|---|---|
| DIGI-KEY PART # | CC1925-ND |
| MANUFACTURER | Sensata-Crydom |
| DESCRIPTION | SCR Module 600 V Bridge, Single Phase - SCRs/Diodes (Layout 1) Through Hole Module |
| DATASHEET | Click Here |
Schematic Symbols
SCR symbols courtesy of Scheme-It please use the link for more information and symbols.
MediaLinks
Videos
SCR Heat Sink Clamp Assembly Procedure Wakefield Thermal
Articles
Articles Featuring SCRs
Product Training Modules
AC Switches Family, Part One - STMicroelectronics
TechForum
AC Switches Family Part Two - STMicroelectronics