Diodes Incorporated 74LVC1G34SE-7

Overview

74LVC1G34SE-7 from Diodes Incorporated is a single non-inverting CMOS buffer gate with push-pull output, designed for voltage-level translation and signal conditioning in mixed-voltage systems. It operates from 1.65V to 5.5V, tolerates 5.5V inputs regardless of supply, delivers ±24mA drive at 3.3V, and supports partial power-down via IOFF circuitry-enabling safe isolation in powered-down subsystems such as USB peripheral interfaces or I²C bus extenders.

For engineers reviewing the 74LVC1G34SE-7 datasheet, 74LVC1G34SE-7 pinout, 74LVC1G34SE-7 application, or 74LVC1G34SE-7 equivalent, key selection criteria include input voltage tolerance (5.5V), IOFF-enabled power-down leakage (<±10μA), propagation delay (≤5.5ns at 3.3V), thermal resistance (371°C/W for SOT353), and compatibility with TTL logic levels.

Technical Context

This device implements a basic positive Boolean function (A = Y) with no internal inversion or enable control. Its IOFF circuit actively disables both output paths during VCC removal, preventing back-current flow into powered-down rails-a critical requirement for hot-swap and battery-backed subsystems.

The input structure accepts voltages up to 5.5V independent of VCC, enabling direct interfacing between 1.8V/2.5V/3.3V logic domains and 5V peripherals without external level shifters. Output drive strength scales with supply voltage, delivering ±24mA at 3.3V and ±32mA at 4.5V while maintaining VOL ≤0.55V and VOH ≥VCC–0.1V under load.

Key Specifications

Pinout & Package

SOT353 (SC-70-5) package: 5-pin surface-mount, 2.1mm × 2.1mm footprint, 0.65mm pitch, moisture sensitivity level 1, tin-plated leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G34DBVR, the 74LVC1G34SE-7 offers superior pinout compatibility with legacy SOT353 designs and lower cost per unit, while the 74LVC1G34Z-7 provides 30% smaller area at the expense of reduced thermal margin-making SE-7 optimal for cost-sensitive, thermally moderate applications requiring proven SOT353 integration.

Availability

74LVC1G34SE-7 is available at Aetrix Electronics and suitable for USB peripheral isolation, I²C bus extension, and industrial sensor signal conditioning requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 74LVC1G34SE-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, energy-efficient components for industrial, computing, and consumer markets.

The 74LVC logic family targets low-voltage, mixed-signal interfacing applications-designed to replace older 74HC/74HCT series with wider supply range, enhanced ESD robustness, and IOFF-enabled power management.

FAQ

Can 74LVC1G34SE-7 be used to translate 5V signals to 1.8V logic?

No-it does not perform voltage translation in the direction from higher to lower supply. While its inputs tolerate 5.5V when VCC = 1.8V, the output swings only between 0V and 1.8V. To drive a 1.8V input from a 5V source, a dedicated level shifter or resistor-divider network is required.

What is the maximum capacitive load this buffer can drive reliably?

At 3.3V supply and 24mA drive, the device maintains specified VOL ≤0.55V into loads up to 30pF (per datasheet test condition). For heavier loads (>50pF), propagation delay increases and edge rates degrade; add series termination or reduce trace length to maintain signal integrity.

Does the NC pin require any special handling on the PCB?

The NC pin (Pin 5) has no internal connection and may be left floating, grounded, or tied to VCC without affecting functionality. Grounding it improves mechanical stability and reduces potential antenna effects in high-frequency layouts, but adds no electrical benefit.

How does IOFF behavior differ from standard high-impedance tri-state outputs?

IOFF disables the output *regardless of input state* when VCC = 0V, blocking both high- and low-side FETs. Unlike tri-state, it requires no enable signal and prevents back-current even if the input is driven high while VCC is absent-making it ideal for partial-power-down scenarios where control signals may remain active.