Diodes Incorporated 74LVC1G34FS3-7

Overview

74LVC1G34FS3-7 from Diodes Incorporated is a single non-inverting buffer gate with push-pull output, designed for voltage-level translation and signal conditioning in mixed-voltage digital systems. It operates across 1.65V–5.5V supply, tolerates 5.5V inputs, supports IOFF partial-power-down mode, and delivers ±24mA drive at 3.3V - used in notebook I/O expansion and peripheral interface isolation.

For engineers reviewing the 74LVC1G34FS3-7 datasheet, 74LVC1G34FS3-7 pinout, 74LVC1G34FS3-7 application, or 74LVC1G34FS3-7 equivalent, key selection criteria include input voltage tolerance, IOFF leakage performance, propagation delay at 3.3V, thermal resistance in DFN0808, and compatibility with 1.8V/3.3V/5V logic domains.

Technical Context

This CMOS buffer implements the Boolean identity function (A = Y) with rail-to-rail output swing and TTL-compatible input thresholds. Its IOFF circuit actively disables output during power-down to prevent backflow current, enabling safe hot-insertion in multi-rail systems.

It features 5.5V-tolerant inputs independent of VCC, allowing direct interfacing between 1.8V controllers and 5V peripherals without external level shifters. Switching performance is characterized across 1.8V–5.0V supplies, with tPD as low as 1.6ns at 5V and 5.5ns at 3.3V over full temperature range.

Key Specifications

Pinout & Package

X2-DFN0808-4 is a 0.8mm × 0.8mm, 0.3mm height, 4-terminal chip-scale package with exposed thermal pad (non-electrical), NiPdAu terminal finish, and moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-buffer gate applications.

Compared with SN74LVC1G34DBVR, the 74LVC1G34FS3-7 offers superior board-area efficiency and routing flexibility via its NC pin and 0.8mm×0.8mm footprint; versus 74AUP1G34GW, it trades ultra-low ICC for essential 5.5V input tolerance and broader supply compatibility in mixed-voltage designs.

Availability

74LVC1G34FS3-7 is available at Aetrix Electronics and suitable for USB peripheral interface, industrial sensor signal conditioning, and embedded display data channel applications requiring stable component supply and consistent DFN0808 packaging.

Supply support for 74LVC1G34FS3-7 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 integrated circuits, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.

The 74LVC logic family targets cost-sensitive, space-constrained digital systems requiring interoperability across voltage domains - optimized for consumer, computing, and industrial edge devices.

FAQ

Can 74LVC1G34FS3-7 be used with a 1.8V supply and 5V input signals?

Yes. The device supports VCC as low as 1.65V and accepts input voltages up to 5.5V regardless of supply level. At 1.8V VCC, VIH is 1.17V min and VIL is 0.63V max, ensuring reliable recognition of 5V-tolerant logic levels without damage or misinterpretation.

What is the thermal performance of the X2-DFN0808-4 package?

The X2-DFN0808-4 package has a junction-to-ambient thermal resistance (θJA) of 400°C/W under standard JEDEC test conditions (2oz copper, minimum pad layout). This value assumes proper thermal pad soldering to a dedicated ground plane; actual performance improves significantly with enhanced copper area or thermal vias.

Does the NC pin require any PCB layout treatment?

No. Pin 3 is a true no-connect - internally unconnected and electrically isolated. It must remain floating on the PCB: do not tie to GND, VCC, or any other net. Routing clearance per IPC-2221B Class B is recommended, but no special keep-out or thermal relief is needed.

How does IOFF behavior affect system-level power sequencing?

When VCC drops below ~0.8V, the IOFF circuit disables both output FETs, presenting >10MΩ impedance at Y. This prevents current from flowing backward into the powered-down IC from active buses - critical for correct power sequencing in multi-rail systems like notebooks or industrial controllers with staggered supply ramps.