Nexperia USA Inc. 74AVCH8T245BQ,118

Overview

74AVCH8T245BQ,118 from Nexperia is an 8-bit dual-supply bidirectional voltage-level translating transceiver with 3-state outputs, supporting independent VCC(A) and VCC(B) rails from 0.8 V to 3.6 V, enabling translation between 0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V logic domains. It features DIR-controlled direction, active-low OE for bus isolation, IOFF partial power-down, and integrated bus-hold on all I/Os-used in mixed-voltage SoC interconnects, FPGA-to-ASIC interfaces, and industrial control backplanes.

For engineers reviewing the 74AVCH8T245BQ,118 datasheet, 74AVCH8T245BQ,118 pinout, 74AVCH8T245BQ,118 application, or 74AVCH8T245BQ,118 equivalent, key selection criteria include dual-rail voltage flexibility, suspend-mode behavior under asymmetric power-down, bus-hold current specs at 1.2 V/1.65 V/2.3 V, and propagation delay asymmetry (An→Bn vs Bn→An) across supply combinations.

Technical Context

This transceiver implements a true dual-reference architecture: An, DIR, and OE inputs are referenced to VCC(A), while Bn inputs/outputs reference VCC(B). Direction control is synchronous and non-latched-data flows only while OE is low and DIR sets path polarity. The IOFF circuit enforces high-impedance output states when either VCC rail drops to GND, preventing backflow current.

Bus-hold circuitry actively sustains valid logic levels on floating A/B port pins without external resistors, with specified IBHL (26–100 μA sink) and IBHH (−24–−100 μA source) across 1.2 V–3.0 V supplies. Propagation delay varies significantly by direction: An→Bn is optimized for low-latency upstream reads (e.g., 3.5 ns max at VCC(A)=3.3 V/VCC(B)=1.8 V), while Bn→An exhibits higher latency (e.g., 5.0 ns max) due to internal level-shifting topology.

Key Specifications

Pinout & Package

DHVQFN24 package (SOT815-1), 3.5 × 5.5 × 0.85 mm body, 24-terminal no-lead thermal-enhanced quad flat; exposed thermal pad (non-electrical, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH8T245RHLR and TXB0108PWR, the 74AVCH8T245BQ,118 uniquely supports 0.8 V operation, delivers superior bus-hold strength at 1.2 V, and guarantees fail-safe high-Z output during asymmetric power loss-making it the sole option for automotive and industrial systems requiring robust mixed-voltage interoperability.

Availability

74AVCH8T245BQ,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive ADAS sensor hubs, FPGA-to-ASIC interconnects, and server memory subsystems requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74AVCH8T245BQ,118 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 applications.

The 74AVCH8T245 belongs to Nexperia's Advanced Very Low Voltage CMOS (AVC) logic family, engineered specifically for seamless voltage translation in heterogeneous digital systems with aggressive power and space constraints.

FAQ

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

The device achieves 380 Mbit/s performance with CL ≤ 15 pF, as validated in Table 15 test conditions. Exceeding 15 pF increases propagation delay nonlinearly-e.g., at 30 pF, An→Bn tpd degrades from 2.7 ns to 4.1 ns at VCC(A)=3.3 V/VCC(B)=1.8 V. Layout must minimize trace capacitance and avoid stubs longer than 5 mm.

Can VCC(A) and VCC(B) be powered from different switching regulators without isolation?

Yes-VCC(A) and VCC(B) may derive from independent regulators, but each requires dedicated 100 nF ceramic decoupling placed ≤1 cm from respective pins. Cross-coupling is suppressed by internal rail separation; however, simultaneous switching noise on one rail can induce ≤50 mV ripple on the other via substrate coupling, necessitating staggered regulator enable timing.

How does bus-hold behave when VCC(A) = 1.2 V and VCC(B) = 0 V (suspend mode)?

In this condition, the A-port bus-hold remains fully active (IBHL = 15 μA, IBHH = −15 μA per pin), while B-port outputs are high-Z. This preserves A-side logic states during B-domain power loss-critical for retaining configuration data in FPGA configuration interfaces during partial system resets.

Is the thermal pad on the DHVQFN24 package electrically connected?

No-the exposed thermal pad (pin 1 index area) has no electrical function. Per SOT815-1 specification, it may remain unconnected, float, or tie to GND; soldering it to GND improves thermal resistance by 12 °C/W but introduces no electrical benefit or risk if left unconnected.