Diodes Incorporated 74AVCH1T45FW5-7

Overview

74AVCH1T45FW5-7 from Diodes Incorporated is a single-bit dual-supply translating transceiver with 3-state outputs and bus hold, designed for bidirectional voltage-level translation between 1.2 V and 3.6 V domains. It features independent VCCA and VCCB supplies, DIR-controlled directionality, ±12 mA drive at 3.3 V, and I_OFF protection enabling partial power-down isolation up to 3.6 V. It is used in mobile SoC interconnects where mixed-voltage GPIO bridging is required.

For engineers reviewing the 74AVCH1T45FW5-7 datasheet, 74AVCH1T45FW5-7 pinout, 74AVCH1T45FW5-7 application, or 74AVCH1T45FW5-7 equivalent, key selection criteria include dual-rail supply flexibility (1.2–3.6 V), bus hold on both A/B inputs, guaranteed 3-state behavior during power loss, and X1-DFN1010-6 package compatibility with space-constrained portable designs.

Technical Context

This device implements a direction-controlled bidirectional data path with separate input/output reference voltages: A port tracks VCCA, B port tracks VCCB, and DIR logic is referenced to VCCA. The internal bus hold circuit (10 kΩ) latches prior input states, eliminating external pull resistors on floating pins.

Its I_OFF functionality activates when either VCCA or VCCB = 0 V, forcing all outputs into high-impedance while blocking backflow currents up to 3.6 V - critical for hot-swap and power-gated subsystems. Propagation delays range from 2.2 ns to 3.3 ns (typ.) depending on supply combinations, with enable/disable times under 7 ns.

Key Specifications

Pinout & Package

X1-DFN1010-6 (1.0 mm × 1.0 mm, 0.35 mm pitch, 0.39 mm height) - ultra-compact leadless package optimized for high-density PCB layouts in mobile and wearables.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC1T45DBVR, the 74AVCH1T45FW5-7 adds bus hold for pin stability but increases quiescent current slightly; versus FXMA108MTCX, it offers precise direction control and lower parasitic capacitance for high-speed single-line use, at the cost of channel count.

Availability

74AVCH1T45FW5-7 is available at Aetrix Electronics and suitable for mobile SoC interconnects, wearable sensor hubs, industrial edge nodes, and USB-C PD controller interfaces requiring stable component supply and long-term manufacturability.

Supply support for 74AVCH1T45FW5-7 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 ICs for power management, signal integrity, and connectivity applications.

The 74AVCH1T45 belongs to the AVCH family of low-voltage translators engineered for energy-efficient, space-constrained portable electronics requiring reliable mixed-voltage interoperability.

FAQ

What is the maximum allowable voltage on A or B pins when VCCA or VCCB is unpowered?

The absolute maximum rating permits up to 4.6 V on A or B pins regardless of supply state. When either VCCA or VCCB = 0 V, the I_OFF feature activates, limiting leakage to ±0.1 μA and blocking damaging back-current flow - enabling safe "live" signal routing during power sequencing or partial shutdown.

Can DIR be driven from a voltage source referenced to VCCB instead of VCCA?

No. DIR is explicitly referenced to VCCA per the datasheet's recommended operating conditions and logic diagram. Driving DIR from VCCB violates input threshold specifications and may cause undefined direction control or increased static current. Always tie DIR to a VCCA-synchronous signal source.

How does the bus hold feature interact with externally pulled inputs?

The 10 kΩ bus hold acts in parallel with external pull resistors. If an external pull-up/down resistor ≤ 10 kΩ is applied, it dominates the node voltage; if >10 kΩ, the bus hold maintains the last valid logic level. This provides fail-safe behavior without conflicting with intentional biasing schemes.

Is the X1-DFN1010-6 package compatible with standard reflow profiles for lead-free assembly?

Yes. The X1-DFN1010-6 package is fully RoHS-compliant and rated for standard JEDEC J-STD-020D reflow profiles, including peak temperatures up to 260 °C. Its thermal resistance (θ_JA = 510 °C/W) is characterized for 2 oz copper FR-4 boards with minimum recommended pad layout per Diodes' package outline documentation.