SN74AVC2T245RSWR datasheet | TI details

SN74AVC2T245RSWR

When designing circuits, you’ll often need a convenient way to bridge signals between different voltage systems. The SN74AVC2T245RSWR is a neat solution—it’s a dual-channel, bidirectional level shifter that smoothly converts voltages from 1.2V to 3.6V, like going between 1.8V and 3.3V systems. With ultra-low delay (less than 2ns), it’s ideal for high-speed buses. It’s easy to use too, featuring DIR and OE pins for direction and output control, making bus sharing straightforward. Its tiny UQFN-10 package, super-low power, and 15kV ESD protection make it perfect for compact, energy-efficient designs.

SN74AVC2T245RSWR Pinout Diagram

When you’re using the SN74AVC2T245RSWR chip, remember that VCCA and VCCB can run at different voltages, like converting between 1.8V and 3.3V systems. Keep in mind, it doesn’t auto-detect signal direction—you’ll need to set this using the DIR pin. Also, make sure the OE pin is pulled low to activate data transfer; otherwise, your outputs stay in high impedance (Hi-Z). Each side’s I/O pins follow their respective voltage rails, so don’t mix them up. A good tip: placing a small 0.1uF capacitor near the chip helps maintain stable power and improves performance at high speeds.

SN74AVC2T245RSWR Equivalent Level Shifter

When choosing replacements for SN74AVC2T245RSWR, here’s my quick advice: If you need higher speed and lower voltage support (down to 0.65V), SN74AXC2T245RSWR is your best upgrade, fully compatible and great for high-speed interfaces. If you’re working with classic 5V systems (like 5V to 3.3V signals), SN74LVC2T245RSWR fits well, but its lower voltage limit is 1.65V—not ideal for 1.2V systems. Lastly, TXS0102RSWR offers automatic direction detection, perfect for I²C or UART to simplify control, but unsuitable if your bus needs strict direction management.

SN74AVC2T245RSWR Voltage Translator Circuit

Here’s a quick rundown on using the SN74AVC2T245RSWR: It’s designed to shift two signals between 1.8V (A side) and 3.3V (B side), ideal for bridging SoC and peripherals. By default, DIR is pulled low to 1.8V via a 10k resistor, meaning signals go from 3.3V down to 1.8V. To flip direction, just pull DIR high (1.8V). Connect OE directly to 3.3V, or use GPIO if you need dynamic control. Place decoupling capacitors close by for stable operation. Be careful not to swap VCCA and VCCB. Also, it’s tiny, so handle PCB layout carefully.

SN74AVC2T245RSWR Bidirectional Level Converter

When designing circuits, you’ll often need to bridge signals between different voltage levels. The SN74AVC2T245RSWR is a handy chip for this. It lets you manually set the data direction with the DIR pin: set DIR high to shift signals from the lower-voltage A side to higher-voltage B side, and low for the opposite. Unlike automatic level shifters, this one offers precise timing, ideal for high-speed connections between an FPGA or MCU and peripherals. Don’t forget to place a 0.1μF capacitor near each power supply pin for stable operation.

SN74AVC2T245RSWR I2C SPI Voltage Shifting

If you’re using SPI for level shifting, the SN74AVC2T245RSWR chip is perfect. Set DIR high for master-out lines (MOSI, SCK, CS) and low for master-in lines (MISO). But don’t use it for I²C—the chip isn’t designed for that. I²C requires automatic direction detection and open-drain compatibility, whereas SN74AVC2T245 uses push-pull outputs, potentially damaging the bus. Instead, pick specialized chips like TXS0102 or PCA9306 for reliable I²C shifting.

SN74AVC2T245RSWR SMD Logic Level Wiring

When you’re wiring up the SN74AVC2T245RSWR on your PCB, keep it straightforward: connect VCCA to your lower voltage (like 1.8V), VCCB to the higher voltage (like 3.3V), and place a 0.1μF capacitor close to each supply pin. Set DIR high for A-to-B conversion, low for B-to-A. Keep OE low to enable outputs. Keep PCB traces short and neat to avoid interference. Also, since the UQFN-10 package is tiny, handle soldering carefully.