FZT857TA High-Voltage NPN Transistor
The FZT857TA is a high-voltage NPN bipolar junction transistor from Diodes Incorporated, offering a collector-emitter breakdown voltage of 300V and a continuous collector current of 3.5A. Housed in a compact SOT-223 package, it delivers robust switching capability in a small footprint suited to space-constrained power boards.
A key advantage of this device is its very low saturation voltage, which keeps on-state power loss and board temperature down during switching. This makes the FZT857TA well suited for LED lighting drivers, switch-mode power supplies, battery chargers, relay drivers and industrial load-switching circuits where efficiency and thermal management matter.
The transistor also offers high peak pulse current capability and a wide operating temperature range, enabling dependable operation under the repeated stress and environmental variation typical of industrial equipment. Its 300V rating allows it to handle line-voltage rails and higher bus voltages encountered in many power-conversion stages.
Because many power-supply and lighting boards are qualified around a specific transistor, the exact part number often needs to be reproduced over the product’s entire lifecycle. The FZT857TA is an established, widely used part with proven field reliability, making it a safe choice for long-lifecycle designs and a practical replacement for boards that have been in service for years.
Supply conditions for high-voltage discrete parts have tightened across the industry. LXBCHIP maintains genuine, traceable, pre-tested stock of the FZT857TA, helping customers avoid extended lead times and counterfeit risk. Authentic sourcing is especially important for high-voltage switching devices, where fake or re-marked parts can fail dangerously.
LXBCHIP supports sample and volume orders, with datasheets and application guidance available. For teams designing or maintaining power-conversion hardware, securing verified FZT857TA inventory helps protect production schedules, field reliability and safety.