Diodes Incorporated 74AVCH1T45FZ4-7

Overview

74AVCH1T45FZ4-7 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 1.2V and 3.6V domains. It features independent VCCA and VCCB supplies, DIR-controlled directionality, I_OFF partial-power-down protection, and ±12mA drive at 3.3V. Used in mobile interface bridging where logic domains differ (e.g., application processor to sensor or PMIC).

For engineers reviewing the 74AVCH1T45FZ4-7 datasheet, 74AVCH1T45FZ4-7 pinout, 74AVCH1T45FZ4-7 application, or 74AVCH1T45FZ4-7 equivalent, this page delivers verified electrical specs, package mapping to X2-DFN1410-6, bus-hold behavior, I_OFF isolation thresholds, and real-world translation timing across VCC combinations.

Technical Context

The device implements a dual-rail CMOS transceiver architecture with separate input/output buffers referenced to VCCA and VCCB. Direction control is synchronous to VCCA, enabling deterministic A→B or B→A data flow without metastability under valid setup/hold conditions.

Bus hold circuitry (10kΩ internal resistors) maintains last-valid logic state on A and B pins during floating conditions, eliminating external pull-ups. I_OFF activates when either VCCA or VCCB = 0V, limiting leakage to ±1μA while blocking backflow up to 3.6V on unpowered rails.

Key Specifications

Pinout & Package

X2-DFN1410-6 (1.4mm × 1.0mm, 0.5mm pitch, 0.55mm height), bottom-terminal chip-scale package with wettable flanks for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC1T45DBVR and TXS0101DCKR, the 74AVCH1T45FZ4-7 uniquely combines bus hold, full 1.2–3.6V flexibility, and I_OFF in a 1.4×1.0mm footprint-making it optimal for space-constrained, partial-power-down mobile and IoT designs where pin count and reliability are prioritized over minimal static current.

Availability

74AVCH1T45FZ4-7 is available at Aetrix Electronics and suitable for mobile interface bridging, IoT sensor hub interconnects, USB-C power delivery subsystems, and industrial PLC I/O expansion requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74AVCH1T45FZ4-7 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and precision timing solutions for consumer, industrial, and automotive markets.

The 74AVCH1T45 belongs to Diodes' AVC logic family, engineered specifically for low-voltage, low-power bidirectional translation in portable electronics where rail independence, bus stability, and power-down safety are mandatory design requirements.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB?

VCCA and VCCB may operate at any combination within 1.2V to 3.6V - including 0V (I_OFF mode). The absolute maximum differential is not limited; however, simultaneous operation requires both supplies ≥1.2V. When one supply is 0V, the other may be up to 3.6V, and I_OFF ensures no back-current flows into the unpowered rail.

Does the bus hold feature affect timing or power consumption?

Bus hold adds ~10kΩ to each A and B pin but does not degrade propagation delay or increase active power. Measured CPD remains ≤21pF. During static hold, leakage is negligible (<100nA), and no additional current flows unless the input is actively driven away from its latched state - making it transparent to timing budgets and battery life.

Can DIR be driven from a different voltage domain than VCCA?

No. DIR is strictly referenced to VCCA; its VIH and VIL thresholds scale with VCCA (e.g., VIH = 0.65×VCCA minimum). Driving DIR from VCCB or another supply risks invalid logic interpretation and unpredictable direction control. A level shifter is required if DIR originates outside the VCCA domain.

Is the X2-DFN1410-6 package compatible with standard reflow profiles for lead-free assembly?

Yes. The X2-DFN1410-6 package is rated for JEDEC J-STD-020D-compliant lead-free reflow (peak 260°C, 20–40 sec above 217°C). Its 0.5mm pitch and wettable flanks support automated optical inspection and high-yield placement. Recommended pad layout matches Diodes' published land pattern (Document AP02007).