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I²C and SMBus voltage level shifter

The NCA9306 component is a dual-channel bidirectional I²C and SMBus voltage level shifter with an enable (EN) input that enables bidirectional voltage conversion from 1.2V to 5V without the need of a direction pin. The switch is designed with a low on-state resistance (RON), allowing connections to be made with minimal propagation delay. When EN is at high power, the converter switch is turned on, and SCL1 and SDA1 I/O are connected to SCL2 and SDA2 I/O respectively, thus achieving bidirectional data flow between ports. When EN level is low, the converter switch is off and there is a high impedance state between ports. In addition to voltage conversion, the NCA9306 component can be used to isolate a 400kHz bus from a 100kHz bus by controlling the EN pin to disconnect the slower bus during fast-mode communication.

Product Features

• 2-bit bidirectional converter for SDA and SCL lines I²C applications

• Compatible with I²C and System Management Bus (SMBus)

• Allowing level shift between the following voltages

o1.2V VREF1 and 1.8V, 2.5V, 3.3 or 5V VREF2

o1.8V VREF1 and 2.5V, 3.3V or 5V VREF2

o2.5V VREF1 and 3.3V or 5V VREF2

o3.3V VREF1 or 5V VREF2

• Allowing bidirectional voltage conversion without direction pin

• Open drain I²C I/O ports (SCL1, SDA1, SCL2 and SDA2)

• Latch-up performance is higher than 100mA, compliant with JESD78 Class II

• ESD protection performance higher than what are stated in JESD22

o2000V human body charge-discharge model (A114-A)

o1000V charging component model (C101)

• Operation temperature: -40℃~105℃

• RoHS compliant package: VSSOP-8, TSSOP-8


• I²C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO and other bidirectional signal interfaces

• Server

• Router (telecom switching equipment)

• Personal computer

• Industrial automation

Functional Block Diagram


For more product information, please contact us.


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Personal Electronics
Enterprise & Communication
Signal Chain
Power Management
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