Diodes Incorporated 74LVC3G34V8-7

Overview

74LVC3G34V8-7 from Diodes Incorporated is a triple non-inverting buffer gate in VSSOP-8 package, operating from 1.65V to 5.5V supply, with 5.5V-tolerant inputs, ±24mA output drive at 3.3V, and IOFF-enabled partial power-down protection. It performs A = Y logic on three independent channels and is used for voltage-level shifting and signal isolation in mixed-voltage digital systems.

For engineers reviewing the 74LVC3G34V8-7 datasheet, 74LVC3G34V8-7 pinout, 74LVC3G34V8-7 application, or 74LVC3G34V8-7 equivalent, key selection criteria include supply voltage range compatibility, 5.5V input tolerance in level-shifting designs, IOFF behavior during system power sequencing, and VSSOP-8 thermal performance (θ_JA = 155°C/W) in space-constrained PCB layouts.

Technical Context

This device implements three independent CMOS buffer stages with standard push-pull outputs and no internal inversion. Each channel supports rail-to-rail input voltage up to 5.5V regardless of V_CC, enabling interoperability between 1.8V, 2.5V, 3.3V, and 5V logic domains.

The IOFF circuit actively disables all outputs when V_CC = 0V, blocking back-current flow from powered I/O lines into the unpowered device-critical for hot-swap and multi-rail power management. Propagation delay is as low as 1.1ns at 5V and 25°C, with guaranteed max 3.8ns across –40°C to +125°C.

Key Specifications

Pinout & Package

VSSOP-8 (Very Thin Shrink Small Outline Package, 2.0mm × 3.4mm body, 0.5mm pitch) with exposed pad not electrically connected. Thermal resistance θ_JA = 155°C/W on JEDEC 2s2p High-K board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple buffer applications.

Compared with SN74LVC3G34DCUR and 74LVC3G34GM,132, the 74LVC3G34V8-7 offers optimal thermal performance in VSSOP-8 form factor and verified 5.5V input tolerance across full temperature range-making it preferred for mixed-voltage industrial control and portable electronics where reliability under voltage transients is critical.

Availability

74LVC3G34V8-7 is available at Aetrix Electronics and suitable for voltage-level translation, power-down signal isolation, and general-purpose logic buffering requiring stable component supply across automotive infotainment, industrial PLC I/O modules, and consumer portable devices.

Supply support for 74LVC3G34V8-7 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 components for industrial, computing, and consumer markets.

The 74LVC logic family delivers low-voltage, high-speed CMOS performance with robust ESD and latch-up immunity-designed specifically for mixed-voltage digital interface and signal conditioning in space- and power-constrained applications.

FAQ

What is the maximum input voltage the 74LVC3G34V8-7 can tolerate when V_CC = 1.8V?

The device accepts inputs up to 5.5V regardless of V_CC level, including at 1.8V operation. This is enabled by input protection circuitry that isolates the core logic from overvoltage conditions-allowing safe interfacing with 5V signals without external components or risk of damage.

Does the 74LVC3G34V8-7 support hot-swap insertion while other system rails remain active?

Yes. The IOFF feature disables all outputs when V_CC = 0V, preventing current backflow from live I/O lines into the unpowered device. This protects both the buffer and upstream drivers during live insertion, making it suitable for modular backplane and hot-plug peripheral designs.

Can unused inputs be left floating?

No. Per the datasheet, unused inputs must be tied to V_CC or GND to ensure proper device operation and prevent increased ICC or undefined output states. Floating CMOS inputs may cause oscillation, excessive power draw, or unpredictable logic behavior due to noise coupling.

Is the VSSOP-8 package of the 74LVC3G34V8-7 lead-free and RoHS compliant?

Yes. The part is fully RoHS 3 compliant (2015/863/EU), with no purposely added lead, and is halogen- and antimony-free ("Green" per Diodes' definition). It meets JESD22-A114 (2kV HBM) and JESD78 Class I latch-up specifications, and is qualified for industrial temperature operation.