Nexperia USA Inc. 74AVCH2T45GF,115

Overview

74AVCH2T45GF,115 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 two I/O ports (1A/2A referenced to VCC(A), 1B/2B to VCC(B)), DIR-controlled directionality, IOFF partial power-down, and integrated bus hold on all data pins. It supports high-speed interfaces in mixed-voltage SoC interconnects, such as 1.8 V FPGA ↔ 3.3 V peripheral communication.

For engineers reviewing the 74AVCH2T45GF,115 datasheet, 74AVCH2T45GF,115 pinout, 74AVCH2T45GF,115 application, or 74AVCH2T45GF,115 equivalent, key selection criteria include bidirectional translation capability across sub-1.2 V to 3.3 V rails, suspend-mode behavior during partial power-down, bus hold elimination of external resistors, and propagation delays under 12 ns at 3.3 V.

Technical Context

The device implements a dual-rail CMOS transceiver architecture with independent VCC(A) and VCC(B) supplies, where DIR (referenced to VCC(A)) controls signal flow direction: HIGH enables A→B, LOW enables B→A. All I/O pins are 3-state capable and tolerate up to 3.6 V regardless of supply voltage.

IOFF circuitry actively disables outputs when either VCC rail drops to GND, preventing backflow current and enabling safe hot-insertion. Bus hold circuitry maintains valid logic states on floating inputs without external biasing-critical for un-driven control lines or stubbed buses in low-power embedded systems.

Key Specifications

Pinout & Package

XSON8 package (SOT833-1): plastic extremely thin small outline, no leads, 8 terminals, body size 1.0 mm × 1.95 mm × 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0202DCUR and SN74AVC2T244RSWR, the 74AVCH2T45GF,115 uniquely combines bidirectional DIR control, integrated bus hold, and guaranteed IOFF behavior - making it the only option among the three qualified for mixed-rail I²C, hot-plug PCIe sideband, and asymmetric power-down embedded subsystems.

Availability

74AVCH2T45GF,115 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive ADAS domain controllers, and 5G baseband radio modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AVCH2T45GF,115 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 high-volume, high-reliability logic, analog, and discrete components - delivering performance-optimized solutions for automotive, industrial, and consumer markets.

The 74AVCH2T45 belongs to Nexperia's Advanced Voltage Controlled (AVC) logic family, engineered specifically for ultra-low-voltage, high-speed bidirectional translation in battery-powered and thermally constrained embedded systems.

FAQ

What is the minimum recommended supply voltage for reliable bus hold operation?

Bus hold functionality is fully specified from VCC = 1.2 V onward, with minimum sustaining currents of ±15 μA at 1.4 V and ±25 μA at 1.65 V. Below 1.2 V, bus hold remains active but sustaining current decreases - design verification is required below 1.2 V per Table 7 and Table 8.

Can DIR be driven from a 3.3 V controller when VCC(A) = 0.8 V?

No. DIR is referenced to VCC(A), so its VIH/VIL thresholds scale with VCC(A). At VCC(A) = 0.8 V, VIH(min) = 0.70 × 0.8 V = 0.56 V. A 3.3 V signal would exceed absolute maximum input voltage (−0.5 V to VCC(A)+0.5 V = 1.3 V), risking damage. A level-shifter or resistor divider is mandatory.

Does the device support asynchronous direction switching during live data transfer?

No. Asynchronous DIR toggling risks bus contention because disable time (tdis) and enable time (ten) are non-overlapping but not atomic. The recommended sequence (Table 17) requires placing both ports in high-Z before changing direction - system firmware must enforce this protocol to avoid signal collisions.

How does IOFF behave when only VCC(B) is powered and VCC(A) = 0 V?

When VCC(A) = 0 V and VCC(B) = 0.8–3.6 V, the A-port outputs enter high-Z with IOFF leakage ≤ ±5 μA (per Table 8), while B-port I/O remains fully functional. This allows safe isolation of the A-side logic domain without disrupting B-side communication - essential for modular power architecture designs.