SN74LVC125APWR Quadruple Bus Buffer with 3-State Outputs (TSSOP-14)

Protect your microcontrollers and manage complex signal routing effortlessly with the SN74LVC125APWR quad bus buffer. This highly versatile logic IC contains four independent line drivers, each equipped with its own active-low output-enable (OE) pin. While it operates on a standard 1.65V to 3.6V supply, its inputs are fully 5V-tolerant. This makes it an incredibly useful tool for safely stepping down 5V logic signals from external sensors or receivers to safe 3.3V levels for STM32 or ESP32 processors without the need for complex level-shifting circuits.

In the realm of custom drone Flight Controllers and professional DIY electronics, this chip is an unsung hero. It is frequently used to isolate SPI buses (allowing multiple gyros or OSD chips to share the same data lines), buffer high-speed UART telemetry, and protect delicate MCU pins from accidental external shorts. The 3-state output capability allows you to easily disconnect signals from a shared data bus, preventing data collisions. Housed in a compact TSSOP-14 package, it saves PCB space while remaining relatively easy to hand-solder during repairs.

Key Features:

• Four Independent Buffers: 4 individual channels with separate output-enable (OE) controls for ultimate signal flexibility.

• 5V-Tolerant Inputs: Safely accepts 5V logic signals even when the chip itself is powered by 3.3V, making it a perfect unidirectional level shifter.

• High-Speed Operation: Extremely low propagation delay ensures flawless performance on fast SPI or UART communication lines.

• MCU Protection: Acts as a physical electrical barrier between external peripheral connections and your expensive flight controller processor.

Specifications:

• Part Number: SN74LVC125APWR

• IC Type: Quad Buffer / Line Driver (3-State)

• Supply Voltage (Vcc): 1.65V – 3.6V

• Input Voltage Tolerance: Up to 5.5V

• Max Output Current: ±24 mA

• Package Type: TSSOP-14 (SMD/SMT)