Diodes Incorporated 74LVC1T45FZ4-7

Overview

74LVC1T45FZ4-7 from Diodes Incorporated is a single-bit, dual-supply translating transceiver in X2-DFN1410-6 package, enabling bidirectional voltage-level translation between 1.65V–5.5V domains. It features tri-state outputs, I_OFF protection, ±24mA drive at 3.3V, and 16µA max ICC. Used for isolating signal paths during partial power-down in portable electronics and interface bridging.

For engineers reviewing the 74LVC1T45FZ4-7 datasheet, 74LVC1T45FZ4-7 pinout, 74LVC1T45FZ4-7 application, or 74LVC1T45FZ4-7 equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB), DIR-controlled directionality, I_OFF behavior at 0V supplies, 3-state timing (tpHZ up to 21.9ns), and DFN1410 thermal resistance (430°C/W).

Technical Context

This device implements a CMOS-based bidirectional bus transceiver with independent VCCA and VCCB rails, where DIR logic referenced to VCCA determines data flow direction between A and B pins. The I_OFF circuitry ensures high-impedance output when either supply drops to 0V, preventing backflow currents up to 5.5V on A/B pins.

It supports wide-voltage translation without external biasing: input thresholds scale with respective VCC rails (e.g., VIH = 0.65×VCCA for 1.65–1.95V operation), and output drive strength varies with supply (e.g., IOH = –32mA at 4.5V). Propagation delays range from 0.5ns to 17.7ns depending on VCCA/VCCB combinations and temperature.

Key Specifications

Pinout & Package

X2-DFN1410-6 is a 1.4mm × 1.0mm, 0.3mm height, 6-pin leadless package with wettable flank side walls for automated optical inspection. Pin 1 (A) is marked by a top-side notch or laser marking per Diodes Inc. specification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1T45DCKR, the 74LVC1T45FZ4-7 offers 36% smaller footprint and lower thermal resistance in DFN1410; versus FXMA108MTCX, it provides deterministic direction control and lower static power-critical for GPIO expansion in resource-constrained MCUs.

Availability

74LVC1T45FZ4-7 is available at Aetrix Electronics and suitable for mobile device power management, USB-C interface bridging, industrial sensor hub interface, and automotive infotainment display link requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC1T45FZ4-7 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-reliability, low-power solutions for consumer, industrial, and automotive markets.

The 74LVC1T45 belongs to Diodes' LVC logic family, designed specifically for low-voltage, multi-rail system interfacing with emphasis on power-down safety, ESD robustness, and compact packaging for portable electronics.

FAQ

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

The 74LVC1T45FZ4-7 does not specify a maximum differential voltage limit between VCCA and VCCB. Per Absolute Maximum Ratings, each supply may independently range from –0.5V to +6.5V, and both can operate simultaneously at their respective rated voltages (e.g., VCCA = 1.8V, VCCB = 5.0V). No derating is required for differential operation.

Can the DIR pin be left floating during operation?

No. The DIR pin has no internal pull-up or pull-down resistor. Floating DIR causes undefined direction control and may result in metastability or excessive supply current. Per Recommended Operating Conditions, unused inputs must be tied to VCCA or GND. For fixed-direction use, connect DIR permanently to VCCA (A→B) or GND (B→A).

Does the device support hot insertion when one supply is powered and the other is off?

Yes. The I_OFF feature activates when either VCCA or VCCB drops to 0V, placing both A and B pins in high-impedance state with leakage ≤±2µA. This prevents back-driving and protects upstream logic, making the device suitable for hot-plug scenarios such as removable modules or field-replaceable units.

How does input hysteresis improve noise immunity in real-world layouts?

The 100mV typical hysteresis on A, B, and DIR inputs raises the effective noise margin by doubling the voltage threshold window (e.g., from 0.8V to 0.9V for VIH at 3.3V). This suppresses false triggering caused by ground bounce, crosstalk, or EMI-induced glitches on shared PCB traces-especially beneficial in dense, multi-layer mobile PCBs.