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Dual Bit Voltage Translator with Bus Hold

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The 74LVCH2T45 is a dual-bit, dual-supply transceiver with tri-state outputs suitable for transmitting two logic bits across different voltage domains. The direction pin (DIR) and Port A, consisting of pins 1A and 2A, have logic levels in relation to VCC(A) while port B, consisting of pins 1B and 2B have logic levels related to VCC(B). This arrangement allows for universal low-voltage translation between any voltages from 1.2V to 5.5V. When a HIGH logic level is applied to the direction pin, port A pins become inputs and port B pins are outputs. Conversely, the roles of the ports are reversed when the direction pin is asserted LOW.

The tri-state (Ioff) feature places all port pins in a high impedance state when either power supply is at 0V, which prevents and damages backflow currents and provides power-down electrical isolation up to 5.5V as not to interfere with any logic activity on either of the ports.

The 74LVCH2T45 is a variant of the 74LVC2T45 that includes a bus hold feature at each input. The bus hold feature maintains the previous logic level therefore a valid logic level is always present eliminating the need for additional resistors for unused or disconnected inputs.


  • Wide Supply Voltage Range:
  • VCC(A): from 1.2V to 5.5V
  • VCC(B): from 1.2V to 5.5V
  • ± 24mA Output Drive at 3.3V
  • CMOS Low Power Consumption 16µA Maximum ICC
  • High Noise Immunity
  • IOFF Supports Partial-Power-Down Mode Operation
  • IOFF Controlled by Either VCC Being at 0V
  • Inputs Accept up to 5.5V
  • Maximum data rates:
  • 420Mbps (3.3V to 5V translation)
  • 210Mbps (translate to 3.3V)
  • 140Mbps (translate to 2.5V)
  • 75Mbps (translate to 1.8V)
  • 60Mbps (translate to 1.5V)
  • ESD Protection Exceeds JESD 22
  • 4000-V Human Body Model (A114)
  • 1000 V Charged Device Model (C101)
  • Latch-up Exceeds 100mA per JESD 78, Class I
  • Specified from -40°C to +85°C and -40°C to +125°C
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change
    control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please
    contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • Voltage Level Translation
    Well-Suited to Join Logic Types Operating at Different Voltages
  • Power-Down Signal Isolation
    If Either Voltage Domain is Turned Off the Signal is Isolated and There is No Loading on Signal Lines
  • Wide Array of Products, such as:
    • Cell Phones, Tablets, E-Readers
    • PCs, Notebooks, Netbooks, Ultrabooks
    • Networking, Routers, Gateways
    • Computer Peripherals, Hard Drives, CD/DVD ROM
    • TV, DVD, DVR, Set-Top Box
    • Personal Navigation / GPS
    • MP3 Players, Cameras, Video Recorders


Product Specifications

Product Parameters

Function Translator
Type Direction-controlled Voltage Translators
Compliance (Only Automotive supports PPAP) Standard
Channels 2
Family LVC
VCC Min (V) 1.2
VCC Max (V) 5.5
Input Type Standard CMOS
Output Type Push-Pull
Output Current (mA) 24

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