TCA9802 Level-Translating I2C Bus Buffer/Repeater |


Level-Translating I2C Bus Buffer/Repeater



The TCA9802 is a dual-channel bidirectional buffer intended for I2C bus and SMBus/PMBus systems. It provides bidirectional level shifting (up-translation and down-translation) between low voltages (down to 0.8 V) and higher voltages (1.65 V to 3.6 V). The TCA9802 features an internal current source on the B-side of the device, allowing the removal of external pull-up resistors on the B-side. The current source also provides an improved rise time and ultra-low power consumption.

The TCA9802 is able to provide true buffering (rather than a pass-FET solution) without using a static voltage offset or incremental offset. This means that the VOL on both the A and B sides of the TCA9802 are very low (approximately 0.2 V), helping to eliminate communication issues as a result of fixed VIL thresholds. Another key feature of the TCA9802 is that there are no power sequencing requirements, or power supply dependencies. VCCA can be greater than, less than, or equal to VCCB. This gives the system designer flexibility with how the TCA9802 is used.

The TCA9802 is part of a four device family with varying current source strengths (see the Device Comparison Table).


  • Two-Channel Bidirectional Buffer
  • Integrated Current Source on B-side, Requires No External B-Side Resistors
  • Ultra-Low Power Consumption
  • No Static-Voltage Offset, Low VOL
  • I2C Bus and SMBus Compatible
  • Operating Supply Voltage Range of 0.8 V to 3.6 V on A-side
  • Operating Supply Voltage Range of 1.65 V to 3.6 V on B-side
  • Active-High Repeater Enable Input
  • Powered-Off High Impedance I2C Bus Pins on A-Side
  • Powered-Off Back-Power Protection I2C Bus Pins
  • Support for Clock Stretching and Multiple Master Arbitration
  • Family of Current Source Options from 0.5 mA to 3 mA

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Parametrics Compare all products in I2C level shifters, buffers & hubs

VCCA (Min) (V)
VCCA (Max) (V)
VCCB (Min) (V)
VCCB (Max) (V)
Supply Restrictions
Frequency (Max) (kHz)
Operating temperature range (C)
Package Group
Approx. price (US$)
No rule    
-40 to 125    
Enable Pin    
VSSOP | 8    
0.31 | 1ku