Nexperia USA Inc. 74AVCH8T245PW,112

Overview

74AVCH8T245PW,112 from Nexperia is an 8-bit dual-supply bidirectional voltage-level translating transceiver with 3-state outputs, supporting independent VCC(A) and VCC(B) supplies from 0.8 V to 3.6 V. It enables translation between 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V logic domains, features bus-hold circuitry on all data I/Os, IOFF partial power-down protection, and operates across –40 °C to +125 °C for industrial embedded interconnect applications.

For engineers reviewing the 74AVCH8T245PW,112 datasheet, 74AVCH8T245PW,112 pinout, 74AVCH8T245PW,112 application, or 74AVCH8T245PW,112 equivalent, key selection criteria include configurable direction control (DIR), active-low output enable (OE), suspend-mode isolation when either supply is grounded, bus-hold current specifications at 1.2 V/1.65 V/2.3 V, and propagation delay asymmetry (An→Bn vs Bn→An) under mixed-voltage conditions.

Technical Context

The device implements a dual-rail CMOS architecture where An, DIR, and OE inputs are referenced to VCC(A), while Bn inputs/outputs reference VCC(B); direction is controlled by DIR (HIGH = An→Bn, LOW = Bn→An). Output enable (OE) is active-low and independently gates both ports into high-impedance state.

IOFF circuitry actively disables outputs during power-down, blocking backflow current when either VCC(A) or VCC(B) = 0 V. Bus-hold circuitry maintains valid logic levels on floating A/B port pins without external resistors, with specified IBHL/IBHH currents at multiple supply voltages and input thresholds aligned to JEDEC standards JESD8-12 through JESD8-B.

Key Specifications

Pinout & Package

TSSOP24 package (SOT355-1), 4.4 mm body width, 0.65 mm pitch, 24-pin surface-mount with exposed thermal pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH8T245RHLR, the 74AVCH8T245PW,112 offers identical translation functionality in a mature TSSOP package with verified manufacturability, while 74LVC8T245PW,118 lacks critical dual-supply and IOFF capabilities required for modern heterogeneous voltage architectures.

Availability

74AVCH8T245PW,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS camera modules, PCIe add-in card interfaces, and server memory subsystems requiring stable component supply across extended temperature ranges.

Supply support for 74AVCH8T245PW,112 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 standard logic, analog, and MOSFET solutions with leadership in advanced packaging and automotive qualification.

The 74AVCH series targets low-voltage, high-speed bidirectional translation in mixed-supply systems, emphasizing IOFF protection, bus-hold integration, and JEDEC-compliant interoperability across voltage nodes from 0.8 V to 3.6 V.

FAQ

What is the minimum recommended load capacitance for reliable 380 Mbit/s operation?

For 380 Mbit/s operation (≥1.8 V to 3.3 V translation), the datasheet specifies CL ≤ 15 pF in the test circuit (Table 15). Exceeding this capacitance increases propagation delay and jitter; measured tpd rises from 2.7 ns at 0 pF to 6.0 ns at 15 pF (Table 9). Layout must minimize trace length and avoid stubs to maintain signal integrity.

Can DIR and OE be driven from different voltage domains than VCC(A)?

No - DIR and OE inputs are strictly referenced to VCC(A) and must be driven by signals compliant with VIH/VIL thresholds defined relative to VCC(A) (Table 7). Driving them from VCC(B) or another rail violates absolute maximum ratings and may cause latch-up or undefined logic states.

How does bus-hold behavior change when VCC(A) and VCC(B) operate at different voltages?

Bus-hold circuitry is implemented per port and powered from its respective supply: A-port bus-hold draws from VCC(A), B-port from VCC(B). IBHL/IBHH values scale with the local supply (e.g., IBHL = 15 μA at VCC = 1.4 V, 100 μA at VCC = 3.0 V), so hold strength is determined solely by the port's own VCC, not the cross-rail voltage difference.

Is the exposed thermal pad on the TSSOP24 package electrically connected?

No - the exposed pad in SOT355-1 is not electrically connected to any internal node. The datasheet explicitly states it has "no electrical or mechanical requirement to solder" and, if soldered, must remain floating or tied to GND. It serves only as a thermal conduction path, not a ground terminal.