Nexperia USA Inc. 74AVC4T245BZX

Overview

74AVC4T245BZX from Nexperia is a 4-bit dual-supply translating transceiver enabling bidirectional level translation between independent voltage domains (VCC(A) and VCC(B), each 0.8 V–3.6 V). It operates as two 2-bit or one 4-bit transceiver, with direction control (nDIR), output enable (nOE), and IOFF circuitry for partial power-down. Used in mixed-voltage SoC interconnects, FPGA I/O bridging, and memory subsystems requiring isolation during suspend.

For engineers reviewing the 74AVC4T245BZX datasheet, 74AVC4T245BZX pinout, 74AVC4T245BZX application, or 74AVC4T245BZX equivalent, key selection criteria include configurable voltage translation range, 3-state bus isolation timing (tpd ≤ 9.1 ns at 3.3 V), IOFF-enabled suspend mode, and JEDEC-compliant low-voltage operation down to 0.8 V.

Technical Context

The device implements dual-rail CMOS logic with separate input/output referencing: nAn/nDIR/nOE tied to VCC(A), nBn tied to VCC(B). Direction control is synchronous and non-latched-data flows A→B when nDIR = HIGH, B→A when LOW. Output enable (nOE, active LOW) places both ports in high-impedance state.

IOFF circuitry actively disables outputs when either VCC(A) or VCC(B) = GND, preventing backflow current and ensuring bus isolation in suspend mode. Propagation delay is asymmetric: A→B path is faster than B→A under identical supply conditions due to internal driver optimization.

Key Specifications

Pinout & Package

DHXQFN16 package (SOT8016-1), leadless, thermal-enhanced, 16-terminal quad flat no-lead with exposed thermal pad (GND-connected recommended).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply translating transceiver applications.

Compared with SN74AVC4T245PWR and 74LVC4T245PW, the 74AVC4T245BZX delivers superior voltage domain independence, smaller footprint, and guaranteed IOFF behavior at 0 V - making it the sole choice for true mixed-voltage, space-constrained, and thermally demanding designs.

Availability

74AVC4T245BZX is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, industrial FPGA-based data loggers, and consumer SoC reference designs requiring stable component supply across extended temperature ranges and mixed-voltage architectures.

Supply support for 74AVC4T245BZX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert delivering high-performance, reliable, and energy-efficient components for automotive, industrial, mobile, and computing markets.

The 74AVC logic family targets ultra-low-voltage, high-speed digital interface applications - specifically engineered for seamless interoperability between next-generation processors, FPGAs, and peripherals operating at 0.8 V to 3.3 V.

FAQ

What is the minimum valid supply voltage for reliable operation of 74AVC4T245BZX?

The device is fully specified from 0.8 V to 3.6 V on both VCC(A) and VCC(B) rails. At 0.8 V, static parameters (VIH/VIL, VOH/VOL) and dynamic timing (tpd ≤ 14.5 ns) remain guaranteed across −40 °C to +125 °C. Operation below 0.8 V is not characterized and may result in undefined logic states or increased leakage.

Can 74AVC4T245BZX translate between 0.8 V and 3.3 V in both directions simultaneously?

No - direction is controlled globally per 2-bit channel via nDIR. For simultaneous A→B and B→A translation, two separate devices or a different architecture (e.g., dual-directional mux) is required. The 74AVC4T245BZX supports bidirectional *capability*, but only one direction is active per channel at any time.

Is the exposed thermal pad on the DHXQFN16 package electrically connected?

Yes - the exposed pad is internally connected to GND. It must be soldered to a PCB thermal pad tied to the system ground plane to meet thermal specifications (Ptot = 250 mW) and ensure reliable operation at +125 °C ambient. Floating the pad degrades thermal performance and risks parametric shift.

Does 74AVC4T245BZX support hot insertion when one supply rail is powered and the other is off?

Yes - IOFF circuitry activates automatically when either VCC(A) or VCC(B) = 0 V, placing all I/Os in high-impedance state with leakage ≤ ±1 μA. This prevents backdrive current into unpowered ICs and satisfies hot-swap requirements in modular systems such as pluggable sensor nodes or field-upgradeable control modules.