Nexperia USA Inc. 74AVC2T45DC,125

Overview

74AVC2T45DC from Nexperia is a dual-bit, dual-supply voltage level translator/transceiver enabling bidirectional logic-level translation between 0.8 V and 3.6 V domains. It features independent VCC(A) and VCC(B) supplies, DIR-controlled data direction (A↔B), 3-state outputs, and IOFF circuitry for partial power-down protection. Used in mixed-voltage SoC interfacing, such as connecting a 1.8 V FPGA I/O bank to a 3.3 V peripheral bus.

For engineers reviewing the 74AVC2T45DC datasheet, 74AVC2T45DC pinout, 74AVC2T45DC application, or 74AVC2T45DC equivalent, key selection criteria include bidirectional translation capability, 0.8–3.6 V dual-supply flexibility, IOFF-enabled power-down safety, and support for high-speed interfaces up to 500 Mbit/s in 1.8 V–3.3 V translation.

Technical Context

The device implements a dual-rail transceiver architecture with separate input/output referencing: pins 1A, 2A, and DIR are referenced to VCC(A); pins 1B and 2B to VCC(B). Direction control is asynchronous and single-pin (DIR), where HIGH enables A→B transmission and LOW enables B→A transmission.

Suspend mode activates when either VCC(A) or VCC(B) = GND, forcing both ports into high-impedance OFF-state. The IOFF circuit ensures leakage current remains ≤ ±35 μA during partial power-down, meeting JEDEC JESD78 Class II latch-up immunity (>100 mA).

Key Specifications

Pinout & Package

VSSOP8 package (SOT765-1): plastic very thin shrink small outline, 8 leads, body width 2.3 mm, lead pitch 0.5 mm, pin 1 indicator below marking code.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-supply voltage translation applications.

Compared with TXS0102DCUR and SN74LVC2T45DCTR, the 74AVC2T45DC provides superior IOFF leakage control (±35 μA), guaranteed suspend-mode behavior, and highest speed grade (500 Mbit/s), making it optimal for automotive and industrial applications demanding deterministic power sequencing and timing margin.

Availability

74AVC2T45DC is available at Aetrix Electronics and suitable for PCIe retimer interfaces, ADAS sensor hubs, industrial PLC I/O modules, and server memory subsystems requiring stable component supply across extended temperature ranges.

Supply support for 74AVC2T45DC 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 focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and computing markets.

The 74AVC2T45 belongs to Nexperia's AVC (Advanced Very low voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in space-constrained, thermally demanding applications.

FAQ

What is the minimum valid voltage difference between VCC(A) and VCC(B)?

No minimum voltage difference is required: VCC(A) and VCC(B) may be equal (e.g., both 1.8 V) or differ by as little as 0.1 V. The device operates correctly across the full 0.8 V–3.6 V range for each supply independently, with no cross-rail dependency beyond functional translation.

Can DIR be driven from a different voltage domain than VCC(A)?

No - DIR is strictly referenced to VCC(A) and must be driven within the VIH/VIL thresholds defined relative to VCC(A). Driving DIR from VCC(B) or another supply violates absolute maximum ratings and risks undefined logic states or increased leakage.

Does the 74AVC2T45DC support hot-plug operation with powered-backplane buses?

Yes - IOFF circuitry ensures outputs disable safely when VCC(A) or VCC(B) drops to 0 V, limiting backfeed current to ≤±35 μA. This allows safe insertion into live 3.3 V or 2.5 V backplanes while the local 1.2 V supply ramps, satisfying IEC 61000-4-2 and MIL-STD-704F transient immunity requirements.

How does propagation delay vary with asymmetric supply combinations?

Propagation delay is asymmetric: A→B delay depends primarily on VCC(B) voltage, while B→A delay depends on VCC(A). For example, at VCC(A)=1.2 V and VCC(B)=3.3 V, tpd(A→B) = 9.2 ns (typ), but tpd(B→A) = 11.8 ns (typ) - design timing budgets must account for this directional asymmetry.