T1235T-8FPA STMicroelectronics Triac A (Transistor Outline, Vertical) In Stock
T1235T-8FPA is a 12 A Snubberless TRIAC from STMicroelectronics rated at 600 V repetitive peak off-state voltage for directly driving AC loads without a snubber network. It uses the TO-220AB through-hole package and is suited for home appliance motor controls and lighting dimmers operating on 50 Hz or 60 Hz mains.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- ACTIVE
- Datasheet
- T1235T-8FPA Datasheet PDF
- Category
- Triac A
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 12 A RMS on-state current rating with Snubberless commutation capability, eliminating RC snubber networks and reducing BOM cost and PCB area in AC power control designs
- 600 V repetitive peak off-state voltage (VDRM) supports direct connection to 120 V and 230 V mains supply for universal residential appliance control applications
- TO-220AB vertical through-hole package with an isolated or non-isolated mounting tab enables easy heatsink attachment for thermal management in motor and lighting control circuits
Applications
The T1235T-8FPA is designed for AC power switching in home appliances such as washing machines, dishwashers, and fans, where snubberless operation simplifies circuit design by removing the need for RC damping networks. Its 12 A current rating and 600 V voltage blocking capability support both 120 V and 230 V motor loads in single-phase AC systems. The device is also commonly used in industrial lighting dimmers, heating element controllers, and soft-start circuits operating directly from 50 Hz or 60 Hz utility power.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for T1235T-8FPA:
Frequently Asked Questions
What does Snubberless mean for T1235T-8FPA and how does it simplify the AC control circuit?
Snubberless operation in T1235T-8FPA means the TRIAC can safely commutate inductive and resistive AC loads at 50 Hz and 60 Hz without requiring an external RC snubber network across its main terminals. Removing the snubber eliminates 2 passive components per switch position, reducing BOM cost, PCB area, and power dissipation in washing machine drum motor and fan speed controller designs.
What is the maximum on-state current and voltage blocking rating of T1235T-8FPA?
T1235T-8FPA is rated for a 12 A RMS on-state current and a 600 V repetitive peak off-state voltage (VDRM). This combination allows the TRIAC to control AC loads up to approximately 2.76 kW on a 230 V supply or 1.44 kW on a 120 V mains supply, covering most single-phase household appliance motor and heating element switching requirements.
Which through-hole package does T1235T-8FPA use and how is it thermally managed in a controller assembly?
T1235T-8FPA comes in a TO-220AB through-hole package with a mounting hole for direct attachment to an external heatsink. At 12 A RMS load current, the junction-to-case thermal resistance of the TO-220AB package allows the die to operate within its rated junction temperature of 125°C when mounted to a heatsink providing approximately 3°C/W thermal resistance, enabling reliable continuous-duty operation in appliance control boards.
When would a designer select T1235T-8FPA over a smaller TRIAC such as BTA08 for an appliance motor drive?
A designer would select T1235T-8FPA over BTA08 (8 A rated) when the load exceeds 8 A RMS, such as in washing machine drum motors drawing 10 A to 12 A during spin cycles or industrial fan motors rated above 1.5 kW on a 230 V supply. The extra 4 A headroom in T1235T-8FPA provides thermal margin and protects the TRIAC during startup inrush currents that can reach 3 to 5 times the steady-state value.
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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.
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