2-bit bidirectional multi-voltage level translator; open-drain; push-pull

The NCA9306 is a 2 channel bidirectional I²C and SMBus multi-voltage level translator with an enable (EN) pin input. It allows voltage translation between 0.95 V and 5 V without the use of a direction pin. It supports up to 100 MHz up translation and >100 MHz down translation at ≤ 30 pF capacitive load. There is no need for a direction pin which minimizes the system effort. The NCA9306 supports 5 V tolerant I/O pins to support mixed mode signal operation. The ability to set up different voltage translation levels on each channel makes the device very flexible and suitable for a lot of different applications.

The low ON-state resistance RON of the switch allows connections to be made with minimal propagation delay. When EN is HIGH, the translator switch is on, and the SCLA and SDAA I/O are connected to the SCLB and SDAB I/O respectively, allowing bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a high-impedance state exists between ports. As with the standard I²C bus-system, pull-up resistors are required to provide the logic HIGH levels on the translators bus. The NCA9306 has a standard open-drain configuration of the I²C-bus. The size of these pull-up resistors depend on the system. Each side of the translator must have a pull-up resistors. NCA9306 is designed to work with Standard-mode, Fast-mode and Fast-mode plus I²C bus devices in addition to the SMBus devices.

When the SDAA or SDAB pin is LOW, the clamp is in the ON-state and a low resistance connections exists between the SDAA and SDAB ports. Assuming the higher voltage is on the SDAB port when the SDAB port is HIGH, the voltage on the SDAA port is limited to the voltage set by refA. When the SDAA port is HIGH, the SDAB port is pulled to the refB supply voltage by the pull-up resistors. The SCLA or SCLB pins also follows the same behavior as described for SDAA or SDAB pins.

Features and benefits

  • 2-channel bidirectional voltage translator for SDA and SCL lines in mixed mode I²C bus applications

  • Open-drain I²C-bus I/O ports (SCLA, SDAA, SCLB and SDAB)

  • Provides bidirectional voltage translation with no direction pin

  • High-impedance SCLA, SDAA, SCLB and SDAB for EN = LOW

  • Up translation

    • < 100 MHz; CL = 30 pF

    • < 40 MHz; CL = 50 pF

  • Down translation

    • > 100 MHz; CL = 30 pF

    • < 40 MHz; CL = 50 pF

  • Hot insertion

  • Bidirectional voltage level translation between:

    • 0.95 V and 1.8 V, 2.5 V, 3.3 V and 5.0 V

    • 1.2 V and 1.8 V, 2.5 V, 3.3 V and 5.0 V

    • 1.8 V and 2.5 V, 3.3 V and 5.0 V

    • 2.5 V and 3.3 V and 5.0 V

    • 3.3 V and 5.0 V

  • Low standby current

  • 5 V tolerant I²C-bus I/O pins to support mixed mode signal operation

  • Low RON provides less signal distortion

  • Latch-up performance exceeds 100 mA per JESD78 class II level A

  • ESD protection:

    • HBM ANSI/ESDA/JEDEC JS-001 Class 2 exceeds 2000 V

    • CDM ANSI/ESDA/JEDEC JS-002 Class C3 exceeds 1000 V

  • Specified from -40 °C to +125 °C


  • GPIO, MDIO, PMBus, SMBus, SDIO, UART, I²C, and other interfaces in Telecom infrastructure

  • Industrial

  • Personal computing

  • Router and Industrial Automation


Type number Product status VCC(A) (V) VCC(B) (V) Logic switching levels Output drive capability (mA) tpd (ns) Nr of bits Power dissipation considerations Tamb (°C) Rth(j-a) (K/W) Ψth(j-top) (K/W) Rth(j-c) (K/W) Package name
NCA9306DP Production 0.95 - 5.0 0.95 - 5.0 CMOS n.a. 0.4 2 low -40~125 219 21.1 107 TSSOP8


Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
Active h9 SOT505-2
SOT505-2 SOT505-2_125

Environmental information

Type number Orderable part number Chemical content RoHS RHF-indicator
NCA9306DP NCA9306DPH NCA9306DP rohs rhf rhf
Quality and reliability disclaimer


Documentation (8)

File name Title Type Date
NCA9306 2-bit bidirectional multi-voltage level translator; open-drain; push-pull Data sheet 2024-03-14
Nexperia_document_guide_MiniLogic_PicoGate_201901 PicoGate leaded logic portfolio guide Brochure 2019-01-07
SOT505-2 3D model for products with SOT505-2 package Design support 2019-01-18
nca9306 NCA9306 IBIS model IBIS model 2020-09-23
Nexperia_package_poster Nexperia package poster Leaflet 2020-05-15
SOT505-2 plastic, thin shrink small outline package; 8 leads; 0.65 mm pitch; 3 mm x 3 mm x 1.1 mm body Package information 2022-06-03
SOT505-2_125 TSSOP8; Reel pack for SMD, 7''; Q3/T4 product orientation Packing information 2020-04-21
NCA9306DP_Nexperia_Product_Reliability NCA9306DP Nexperia Product Reliability Quality document 2023-05-29


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File name Title Type Date
nca9306 NCA9306 IBIS model IBIS model 2020-09-23
SOT505-2 3D model for products with SOT505-2 package Design support 2019-01-18

Ordering, pricing & availability

Type number Orderable part number Ordering code (12NC) Status Packing Packing Quantity Buy online
NCA9306DP NCA9306DPH 935691027125 Active SOT505-2_125 3,000 Order product


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Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
NCA9306DP NCA9306DPH 935691027125 SOT505-2 Order product