40TPS12A SCR 1200V 35A Phase Control SCR Thyristor TO-247
40TPS12A SCR 1200V 35A Phase Control Thyristor
The 40TPS12A SCR is a high-voltage, high-current Silicon Controlled Rectifier (SCR) designed for phase-control and power-switching applications. With a 1200V repetitive peak off-state voltage and 35A rated average on-state current, it is suitable for demanding power electronics circuits where controlled rectification and switching are required.
This SCR is commonly identified with the 40TPS12A / VS-40TPS12A-M3 series and uses a TO-247 3-pin through-hole package. Distributor specifications list a 600A peak surge current, making the device suitable for circuits that can experience high short-duration current surges when properly designed and thermally managed.
The SCR can be triggered through its gate and then remains conducting while the appropriate forward-bias and current conditions are maintained. This makes it useful for AC phase control, controlled rectifiers, motor speed control, heater control, battery chargers, welding equipment, regulated power supplies, and industrial power-control circuits.
For high-current operation, appropriate heatsinking, PCB/layout practices, gate-drive design, insulation, and electrical protection are important. The actual allowable current depends on operating conditions, temperature, cooling, duty cycle, and the manufacturer's datasheet limits.
Specifications:
| Specification | Details |
|---|---|
| Part Number | 40TPS12A |
| Alternate Part Number | VS-40TPS12A-M3 |
| Component Type | SCR / Thyristor |
| Device Type | Phase Control SCR |
| Repetitive Peak Off-State Voltage | 1200V |
| Rated Average On-State Current | 35A |
| Peak Surge Current | Up to 600A |
| Package | TO-247 |
| Number of Pins | 3 |
| Mounting | Through Hole |
| Peak On-State Voltage | 1.85V |
| Maximum Gate Trigger Voltage | 2.5V |
| Gate Trigger Current | Verify exact variant datasheet |
| Holding Current | Approximately 150mA for the Vishay-listed version |
| Operating Temperature | −40°C to +125°C |
| Switching Type | Unidirectional SCR |
| Application | Phase control / power control |
The above values are based primarily on the Vishay/RS listing for VS-40TPS12A-M3. Some marketplace listings use 40TPS12A/40TPS12APBF terminology, so verify the exact manufacturer's datasheet and marking before designing a production circuit.
Pin Configuration:
The 40TPS12A is a 3-pin SCR. For the exact physical pin order, verify the datasheet for the specific manufacturer's version before PCB assembly.
Typical SCR terminals are:
- Anode (A)
- Cathode (K)
- Gate (G)
The gate is used to trigger the SCR into conduction. Do not assume the physical pin order from another SCR model; check the package marking/datasheet before connecting it.
Applications:
The 40TPS12A 1200V 35A SCR can be considered for:
- AC phase control
- Controlled rectifier circuits
- DC power supplies
- Battery charger circuits
- Motor speed control
- Heater temperature control
- Industrial power controllers
- Welding equipment
- Regulated power supplies
- High-power LED or lamp control
- Power conversion circuits
- Industrial automation equipment
- Electronic load control
- High-current switching applications
- Student electronics projects
- Engineering prototypes
Vishay's listed applications for this family include battery chargers, welders, plating equipment, regulated power supplies, and temperature/speed-control circuits.
Why Choose 40TPS12A?
High voltage rating: 1200V VDRM provides substantial voltage-handling capability for appropriately designed power-control circuits.
High current capability: 35A average on-state current makes it suitable for higher-power applications.
High surge capability: The Vishay-listed version specifies up to 600A peak non-repetitive surge current.
TO-247 package: The through-hole TO-247 package is convenient for power electronics designs and heatsink-based thermal management.
Phase-control operation: Suitable for controlling power delivered to AC loads through appropriate SCR control circuits.
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