BSS138 in TXS0108 / BSS138 Level Shifters Family
The BSS138 series consists of N-channel logic-level enhancement mode field-effect transistors specifically designed to minimize on-state resistance while maintaining rugged, reliable performance. Primarily manufactured by Diodes Inc., ON Semiconductor, and Nexperia, these MOSFETs are industry-standard components for bidirectional level shifting in low-voltage applications. They are most commonly deployed in simple discrete circuits to interface 3.3V microcontrollers with 5V I2C or SPI peripherals, providing a cost-effective solution for voltage domain translation.
Variants in This Sub-Family
Variants within the BSS138 family primarily differ in their maximum drain-source voltage (Vds) ratings and gate-source protection. While the standard version handles up to 50V, some automotive-qualified variants (AEC-Q101) offer enhanced thermal stability and stricter manufacturing tolerances. Packaging is predominantly SOT-23, though ultra-miniature leadless variants exist for high-density mobile applications. Engineers should also note minor variations in RDS(on) and gate charge between different silicon vendors.
