TYN812RG STMicroelectronics SCR (Transistor Outline, Vertical) In Stock
TYN812RG is an 800 V, 8 A single-channel SCR thyristor from STMicroelectronics with a 15 mA gate trigger current and 200 V/µs critical dV/dt rating in a TO-220AB 3-pin through-hole package. Its sensitive gate and high blocking voltage make it suitable for AC switching, motor control, and power control applications. Available worldwide with global shipping options.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- TYN812RG Datasheet PDF
- Category
- SCR
- Price
- From $0.4610(MOQ 1)
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of TYN812RG?
- 800 V off-state blocking voltage with a 200 V/µs critical dV/dt rating provides robust immunity to transient overvoltages and fast voltage ramps in AC mains-connected power control circuits
- Low 15 mA gate trigger current (maximum 0.2 mA DC trigger current sensitivity) enables direct drive from low-power microcontroller outputs and optocouplers without intermediate gate amplifier stages
- TO-220AB 3-pin package with anode case connection allows direct heat sink mounting for efficient thermal management at 8 A continuous on-state current in motor speed control and heating applications
What is TYN812RG used for?
TYN812RG is used in AC power control circuits such as light dimmers, heater controllers, and fan speed regulators operating from 120 V or 230 V mains, where its 800 V blocking voltage provides adequate margin above the peak mains voltage with a safety headroom of 200 V or more. It is also deployed in half-wave rectifier switching and soft-start motor control circuits, where controlled gate triggering gradually phases in conduction angle to limit inrush current during motor startup. Industrial AC relay replacement and solid-state switch applications benefit from its low holding current of 30 mA maximum and compact TO-220AB footprint, simplifying heat sink selection and mechanical assembly.
What are the specifications of TYN812RG?
| Factory Lead Time | 15Weeks |
| YTEOL | 6.43 |
| Case Connection | ANODE |
| Configuration | SINGLE |
| Critical Rate of Rise of Off-State Voltage-Min | 200V/us |
| DC Gate Trigger Current-Max | 0.2mA |
| DC Gate Trigger Voltage-Max | 1.3V |
| Holding Current-Max | 30mA |
| JEDEC-95 Code | TO-220AB |
| JESD-30 Code | R-PSFM-T3 |
| JESD-609 Code | e3 |
| Leakage Current-Max | 2mA |
| Non-Repetitive Pk On-state Cur | 146A |
| Number of Elements | 1 |
| On-state Current-Max | 8000A |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | FLANGE MOUNT |
| Qualification Status | Not Qualified |
| RMS On-state Current-Max | 12A |
| Repetitive Peak Off-state Voltage | 800V |
| Repetitive Peak Reverse Voltage | 800V |
| Surface Mount | NO |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | SINGLE |
| Trigger Device Type | SCR |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8541.30.00.80 |
| Country of Origin | Mainland China |
Where can I find the TYN812RG datasheet?
TYN812RG Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for TYN812RG?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the on-state current rating of TYN812RG and what load types can it control directly?
TYN812RG is rated for a continuous on-state current (IT(RMS)) of 8 A, making it suitable for directly switching resistive loads up to approximately 1.8 kW at 230 V AC or 960 W at 120 V AC without an external current-boosting snubber. For inductive loads such as motors and transformers, the 200 V/µs dV/dt rating and a correctly sized RC snubber network allow reliable commutation when the load current passes through zero at the end of each AC half-cycle.
How sensitive is the TYN812RG gate trigger, and can it be driven directly from a 3.3 V microcontroller?
TYN812RG has a maximum gate trigger current of 15 mA and a maximum DC gate trigger voltage of 1.3 V, with the minimum trigger threshold being lower still. A standard small-signal NPN transistor or an optocoupler with a 3.3 V control input can supply 15 mA gate current through a series resistor of approximately 150 Ω, making direct MCU-to-SCR drive feasible without a dedicated gate driver IC. For isolated designs, an optocoupler such as the MOC3020 family provides galvanic isolation between the 3.3 V logic domain and the 800 V AC mains-referenced gate circuit.
What does the 200 V/µs dV/dt rating of TYN812RG mean for snubber design in an AC switching application?
The 200 V/µs critical dV/dt specification means that if the anode-to-cathode voltage rises faster than 200 V/µs while the SCR is in the off state, the device may trigger spuriously without a gate signal. In a 230 V AC circuit with fast-switching relay contacts or a zero-crossing switch, an RC snubber network — typically 100 Ω in series with 10 nF to 100 nF — is placed across the SCR to limit transient dV/dt to below 200 V/µs, preventing false firing and ensuring the thyristor only turns on under intentional gate control.
How should TYN812RG be mounted to a heat sink for reliable thermal management at its maximum rated current?
TYN812RG uses a TO-220AB package with the anode connected to the metal tab, allowing the tab to be bolted directly to an aluminum heat sink with a thermal interface material such as a 0.075 mm silicone pad providing approximately 0.5°C/W contact resistance. At 8 A with a typical on-state voltage drop of 1.5 V, the device dissipates about 12 W; a heat sink with a thermal resistance of 5°C/W or less keeps the junction temperature below 100°C at a 25°C ambient, well within the 125°C maximum junction temperature rating.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.2090 | $1.21 |
| 10+ | $0.8100 | $8.10 |
| 17+ | $0.8060 | $13.70 |
| 20+ | $0.6190 | $12.38 |
| 25+ | $0.4836 | $12.09 |
| 2000+ | $0.4610 | $922.00 |
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