FMMT458TA

The FMMT458TA is a 400V NPN high voltage bipolar junction transistor manufactured by Diodes Incorporated. It is designed for general purpose switching and amplification applications requiring high voltage capability in a compact surface-mount package. The transistor offers a minimum collector-emitter breakdown voltage (BVCEO) of 400V and a continuous collector current rating of 225mA, with a peak pulse current capability of 1A. The DC current gain (hFE) is typically 100 at 50mA collector current and 10V collector-emitter voltage, ensuring good amplification characteristics.

The device features a low collector-emitter saturation voltage of 500mV at 50mA, contributing to efficient switching performance. With a transition frequency of 50MHz, it is suitable for moderate-speed switching circuits. The FMMT458TA is rated for a maximum power dissipation of 500mW and can operate over a junction temperature range of -55°C to 150°C. It also includes ESD protection with a Human Body Model rating of 4000V (Class 3A) and Machine Model rating of 400V (Class C).

The transistor is housed in a standard SOT23 surface-mount package (also known as TO-236-3 or SC-59), making it ideal for space-constrained designs. The package is molded plastic with UL94V-0 flammability rating and matte tin plated terminals. It is moisture sensitivity level 1 (unlimited) per J-STD-020. The device is fully RoHS3 compliant, lead-free, and halogen-free, meeting environmental standards for green manufacturing.

The FMMT458TA is the standard version; an automotive-compliant variant (FMMT458Q) is available separately. Complementary PNP type is FMMT558. This transistor is suitable for applications such as high voltage switching, driver circuits, and general purpose amplification in consumer, industrial, and telecommunications equipment.