Thyristors - SCRs

Thyristors - SCRs - Modules

Part Number	Description / PDF	Quantity
NTE5710 NTE Electronics, Inc.	SCR 1200V 120A MODULE	0
NTE5708 NTE Electronics, Inc.	SCR 1600V 25A MODULE	58
NTE5714 NTE Electronics, Inc.	SCR 1600V 65A MODULE	16
NTE5728 NTE Electronics, Inc.	SCR 1600V 250A MODULE	20
NTE5720 NTE Electronics, Inc.	SCR 1200V 90A MODULE	0
NTE5724 NTE Electronics, Inc.	SCR 1600V 90A MODULE	56
NTE5726 NTE Electronics, Inc.	SCR MODULE 1.6KV 160A	14
NTE5351 NTE Electronics, Inc.	SCR-600V 5A HI SPEED	136
NTE5721 NTE Electronics, Inc.	SCR 1200V 90A MODULE	17
NTE5704 NTE Electronics, Inc.	INDUSTRIAL POWER MODULE	49
NTE5703 NTE Electronics, Inc.	INDUSTRIAL POWER MODULE	6
NTE5702 NTE Electronics, Inc.	INDUSTRIAL POWER MODULE	8
NTE5722 NTE Electronics, Inc.	SCR 1200V 90A MODULE	16
NTE5712 NTE Electronics, Inc.	SCR 1200V 120A MODULE	18
NTE5701 NTE Electronics, Inc.	INDUSTRIAL POWER MODULE	24
NTE5705 NTE Electronics, Inc.	INDUSTRIAL POWER MODULE	38
NTE5700 NTE Electronics, Inc.	INDUSTRIAL POWER MODULE	42
NTE5711 NTE Electronics, Inc.	SCR 1200V 120A MODULE	50

Thyristors - SCRs - Modules

1. Overview

Silicon Controlled Rectifiers (SCRs) are four-layer (PNPN) semiconductor devices that act as controlled switches for high-power applications. As key members of the thyristor family, SCR modules enable precise control of electrical power in industrial systems. Their ability to handle high voltages (>6000V) and currents (>5000A) makes them indispensable in power electronics, particularly for AC/DC conversion, motor speed control, and load management systems.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Single-phase SCR Module	Compact design with integrated snubber circuitry	Single-phase motor controllers, heating systems
Three-phase SCR Module	6-pack configuration for 3-phase power control	Variable frequency drives, industrial furnaces
Reverse-Conducting SCR (RC-SCR)	Integrated freewheeling diode for inductive loads	Traction converters, welding equipment
Light-Triggered SCR (LTSCR)	Optical gate activation for high-noise environments	High-voltage DC transmission systems
SCR Power Stack Module	Multi-chip parallel configuration for extreme currents	Electrolysis plants, large motor soft starters

3. Structure and Composition

Typical SCR module construction includes:

Die-level PNPN junction semiconductor (silicon base)
DBC (Direct Bonded Copper) substrate for thermal management
Gate control circuit with trigger transformer isolation
Press-pack or soldered housing with IP54 protection rating
Dielectric cooling interface ( silicone pad or phase-change material)

Advanced modules integrate temperature sensors and MOV-based overvoltage protection.

4. Key Technical Specifications

Parameter	Typical Range	Importance
Rated Repetitive Peak Voltage (VRRM)	600V - 6500V	Determines maximum operating voltage
Rated Average On-state Current (ITAV)	25A - 3000A	Defines continuous load capacity
Gate Trigger Current (IGT)	50 A - 50mA	Affects control circuit design
dv/dt Capability	10-500 V/ s	Indicates immunity to voltage spikes
Thermal Resistance (Rth)	0.01-0.5 K/W	Impacts cooling requirements

5. Application Fields

Primary industries utilizing SCR modules:

Industrial: Motor drives (cranes, mills), welding machines, heating controllers
Energy: HVDC transmission, static VAR compensators, battery charging systems
Transportation: Traction converters for trains, EV charging stations
Utilities: Smart grid power flow controllers, uninterruptible power supplies

Case Study: 3 MW wind turbine converter using 1700V/1200A SCR modules achieves 98.5% conversion efficiency.

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
ABB	5SNA 2400K170300	1700V/2400A, press-pack design, 50kA short-circuit rating
ON Semiconductor	CM400HA-34H	1600V/400A, hockey puck package, <2V forward voltage
Infineon	B25801-A1047	1200V/800A, integrated heat sink, RoHS compliant
Mitsubishi Electric	PM100CL1A-120	1200V/100A, low inductance package, 150 C operating temp

7. Selection Guidelines

Key considerations:

Derate ITAV by 20-30% for safety margin
Select VRRM 1.5 system peak voltage
Match gate drive circuit to IGT specifications
Consider thermal interface material (TIM) performance
Verify short-circuit withstand capability

Recommend consulting manufacturer's SOA (Safe Operating Area) curves for critical applications.

Industry Trends

Emerging developments:

SiC-based SCR prototypes enabling 3 higher switching frequencies
Smart power modules with embedded current/voltage sensors
Double-sided cooling packages reducing thermal resistance by 40%
Grid-forming SCR systems for renewable energy integration
Lead-free packaging compliant with REACH regulations