BUK9508-55B vs 55A MOSFET Comparison Guide

The BUK9508 series consists of logic-level N-channel TrenchMOS enhancement mode Field-Effect Transistors (FETs) primarily manufactured by Nexperia (formerly NXP/Philips). Designed for automotive and high-demand power switching, the series is characterized by its high junction temperature rating of 175 °C and AEC-Q101 automotive grade compliance Nexperia Nexperia.

Product Insights: BUK9508-55A vs. BUK9508-55B

While sharing a 55V rating, the two versions differ in power handling and lifecycle status:

* BUK9508-55B (Active): The current production standard, offering 203W power dissipation and a drain current of 75A (package limited) Nexperia.

* BUK9508-55A (Obsolete/Legacy): Generally listed as discontinued, it featured a higher chip-level current rating and 253W dissipation but has been largely replaced by the 'B' variant in new designs Nexperia.

Market Trends & Availability

The global power MOSFET market is projected to grow from $8.97 billion in 2026 to over $14.9 billion by 2034, driven by demand for energy-efficient power management in automotive and industrial sectors Straitsresearch Persistencemarketresearch.

For the BUK9508 series specifically:

* Pricing: B2B listings show units priced between $0.28 and $0.55 for bulk orders (100+ pieces), with some listings reaching up to $1.20 for smaller quantities Alibaba Alibaba.

* Sourcing: Despite the 'A' variant's legacy status, both versions remain widely available through authorized distributors and electronic component suppliers in hubs like Shenzhen and Hong Kong Alibaba Alibaba.

Detailed B2B search results including pricing, MOQ, and supplier details are available in the files below.