Diodes Incorporated 74AVC1T45FW3-7

Overview

74AVC1T45FW3-7 from Diodes Incorporated is a single-bit dual-supply translating transceiver with 3-state outputs, designed for bidirectional voltage-level translation between 1.2V and 3.6V domains. It features independent VCCA and VCCB supplies, direction-controlled data flow via DIR pin referenced to VCCA, and I_OFF protection enabling partial power-down isolation up to 3.6V. Used in mobile SoC interconnects where mixed-voltage logic (e.g., 1.8V processor ↔ 3.3V peripheral) requires robust signal integrity.

For engineers reviewing the 74AVC1T45FW3-7 datasheet, 74AVC1T45FW3-7 pinout, 74AVC1T45FW3-7 application, or 74AVC1T45FW3-7 equivalent, key selection criteria include bidirectional translation range (1.2–3.6V), ±12mA drive at 3.3V, 100mV input hysteresis, I_OFF behavior at 0V supply, and X2-DFN0910-6 package thermal resistance (530°C/W).

Technical Context

The device implements a dual-rail CMOS transceiver architecture with separate VCCA and VCCB supplies, allowing A-side I/O to track VCCA and B-side I/O to track VCCB. Direction control is asynchronous and level-sensitive: DIR high enables A→B transmission, DIR low enables B→A transmission.

I_OFF circuitry activates when either VCCA or VCCB drops to 0V, forcing all outputs into high-impedance state regardless of input levels-preventing backflow currents and ensuring electrical isolation up to 3.6V on A/B pins. Input tolerance extends to 4.6V independent of supply rails.

Key Specifications

Pinout & Package

X2-DFN0910-6 is a 0.9mm × 1.0mm, 0.4mm pitch, 6-pin chip-scale package with bottom-side thermal pad; footprint optimized for space-constrained mobile applications and compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional voltage translation applications.

Compared with SN74AVC1T45DBVR, the 74AVC1T45FW3-7 trades thermal efficiency for extreme miniaturization-critical in smartphones and wearables-while FXMA108MUTAG introduces architectural divergence (auto-direction) that increases design risk for simple point-to-point links.

Availability

74AVC1T45FW3-7 is available at Aetrix Electronics and suitable for mobile consumer electronics, industrial sensor nodes, and medical wearables requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for 74AVC1T45FW3-7 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

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal components for power management, signal integrity, and connectivity applications.

The 74AVC logic family targets low-voltage, high-speed digital interfacing in portable and battery-powered systems, emphasizing minimal power consumption, wide voltage compatibility, and robust ESD performance.

FAQ

What is the maximum allowable voltage on the A or B pin when VCCA or VCCB is at 0V?

The A and B pins tolerate up to 4.6V regardless of supply state. When either VCCA or VCCB is at 0V, the I_OFF feature forces outputs into high-impedance mode, preventing current flow and enabling safe hot-plug or partial-power-down operation without damaging backflow currents.

Can the DIR pin be left floating or tied to VCCB?

No - DIR must be actively driven to a valid logic level referenced to VCCA. Floating DIR causes undefined direction control and potential bus contention. Tying DIR to VCCB is invalid because DIR thresholds are defined relative to VCCA; doing so may violate VIH/VIL specifications and cause erratic switching behavior.

How does the 100mV input hysteresis improve system reliability?

The 100mV hysteresis provides noise margin against ground bounce, supply ripple, and crosstalk-induced voltage fluctuations. In high-density PCBs with fast-switching adjacent nets (e.g., DDR clock routing near I²C lines), it prevents false triggering and metastability, ensuring deterministic DIR and data sampling even under transient noise exceeding 100mV peak-to-peak.

Is the X2-DFN0910-6 package compatible with standard reflow soldering processes?

Yes - the X2-DFN0910-6 meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) and supports standard lead-free reflow profiles (peak 260°C). Its 0.4mm pitch and exposed thermal pad require controlled stencil aperture (0.15mm thickness, 80% area ratio) and nitrogen-assisted reflow to ensure void-free solder joints and mechanical reliability.