BT149 Thyristor, 400V, 200µA, TO-92

The BT149 is a planar passivated silicon controlled rectifier (SCR) housed in a compact SOT54 (TO-92) plastic package. Designed for efficient and reliable switching, this thyristor is engineered for direct interfacing with microcontrollers, logic ICs, and other low-power gate trigger circuits, making it an ideal component for modern electronic designs where space and power efficiency are critical.

Its sensitive gate allows for direct triggering from low-power drivers and logic ICs, simplifying circuit design and reducing the need for additional driver components. The planar passivated construction provides enhanced voltage ruggedness and long-term reliability, ensuring stable performance in a variety of demanding applications.

Key Features & Benefits

• General Purpose Switching: Excellently suited for a wide range of general-purpose switching and phase control applications.
• Low Power Circuit Compatibility: Ideal for use in low-power circuits due to its very low gate trigger requirements.
• Robust Construction: Planar passivated silicon design offers superior protection against voltage transients and ensures operational durability.
• Easy Integration: The standard TO-92 through-hole package allows for straightforward PCB mounting and is compatible with common prototyping and production methods.

Technical Specifications

• Peak Repetitive Off-State Voltage (Vdrm): 400V
• Max Gate Trigger Current (Igt): 200µA
• Average On-State Current (It(av)): 500mA
• On-State RMS Current (It(rms)): 800mA
• Max Holding Current (Ih): 5mA
• Max Gate Trigger Voltage (Vgt): 800mV
• Peak Non-Repetitive Surge Current (Itsm): 9A
• Maximum Operating Temperature: 125°C
• Package / Case Style: TO-92 (SOT54)
• Mounting Type: Through Hole
• Number of Pins: 3

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