Texas Instruments SN74LVC3G34DCUTG4

Overview

SN74LVC3G34DCUTG4 from Texas Instruments is a triple non-inverting buffer gate IC designed for 1.65-V to 5.5-V V_CC operation, performing Y = A logic across three independent channels. It delivers ±24-mA output drive at 3.3 V, achieves 4.1-ns max propagation delay at 3.3 V, and supports 5.5-V-tolerant inputs - enabling voltage-level translation in portable audio and embedded interface applications.

For engineers reviewing the SN74LVC3G34DCUTG4 datasheet, SN74LVC3G34DCUTG4 pinout, SN74LVC3G34DCUTG4 application, or SN74LVC3G34DCUTG4 equivalent, this page provides verified package mapping (VSSOP-8), I_off-enabled partial-power-down capability, 5.5-V input tolerance, sub-5-ns timing at 3.3 V, and confirmed alternative part options for system-level buffer replacement.

Technical Context

The SN74LVC3G34DCUTG4 implements three independent CMOS buffer stages with identical input/output characteristics and no internal inversion. Each channel features rail-to-rail output swing, 5.5-V-tolerant inputs regardless of V_CC, and I_off circuitry that disables outputs and blocks current backflow when V_CC = 0 V.

It operates across –40°C to 125°C ambient temperature, supports down-translation from 5.5-V inputs to lower V_CC levels (e.g., 3.3 V or 1.8 V), and exhibits low dynamic power consumption (C_pd = 19 pF at 3.3 V) with typical ground bounce <0.8 V and VOH undershoot >2 V at 3.3 V.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.30 mm × 2.00 mm body, 0.65-mm lead pitch, 1.3-mm max height, gull-wing leads, pin 1 marked by beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC3G34DCUTG4, SN74LVC1G34DBVR offers modularity at the cost of area and BOM count, while 74LVC3G34GW,115 trades thermal margin for footprint reduction - making SN74LVC3G34DCUTG4 optimal for high-reliability, multi-channel, wide-temperature applications.

Availability

SN74LVC3G34DCUTG4 is available at Aetrix Electronics and suitable for portable audio docks, SSD power sequencing, and industrial HMI interface design requiring stable component supply, long-term lifecycle support, and RoHS-compliant VSSOP packaging.

Supply support for SN74LVC3G34DCUTG4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability interface ICs.

The SN74LVC3G34 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-voltage operation, high noise immunity, and seamless voltage translation in portable, industrial, and computing systems.

FAQ

What is the maximum operating temperature for SN74LVC3G34DCUTG4?

The SN74LVC3G34DCUTG4 is rated for operation from –40°C to +125°C ambient temperature when used in the VSSOP-8 (DCU) package. This specification is validated per JEDEC JESD22-A104 and applies across the full 1.65-V to 5.5-V V_CC range. Thermal derating is not required up to 125°C, and R_θJA = 227°C/W enables reliable performance in thermally constrained layouts.

Does SN74LVC3G34DCUTG4 support level translation between 5-V and 3.3-V logic domains?

Yes, SN74LVC3G34DCUTG4 supports down-translation: its inputs tolerate up to 5.5 V regardless of V_CC voltage, allowing 5-V signals to safely drive the device while it operates from a 3.3-V (or 1.8-V) supply. Outputs swing rail-to-rail between GND and the applied V_CC, so a 3.3-V V_CC yields 0–3.3-V output levels compatible with downstream 3.3-V receivers.

Can unused inputs on SN74LVC3G34DCUTG4 be left floating?

No - all unused inputs on SN74LVC3G34DCUTG4 must be externally biased to either V_CC or GND. Floating CMOS inputs cause undefined logic states, increased ICC, and potential oscillation due to noise coupling. TI's application report SCBA004 explicitly mandates termination; failure to do so risks functional instability and excessive power consumption in the SN74LVC3G34DCUTG4.

What is the purpose of the I_off feature in SN74LVC3G34DCUTG4?

The I_off feature in SN74LVC3G34DCUTG4 disables all three output buffers and blocks current flow when V_CC = 0 V, preventing damaging back-current from live system buses into a powered-down device. This enables safe hot-plug operation, partial power-down in multi-rail systems, and robustness against back-driving - a requirement verified per JEDEC JESD78 Class II latch-up testing (>100 mA).

Is SN74LVC3G34DCUTG4 pin-compatible with other members of the SN74LVC3Gxx series?

No - SN74LVC3G34DCUTG4 is not pin-compatible with other SN74LVC3Gxx variants such as SN74LVC3G74 (dual D-type flip-flop) or SN74LVC3G17 (triple Schmitt-trigger buffer), as each has distinct pin functions and internal logic. Pin compatibility exists only within the SN74LVC3G34 family (e.g., SN74LVC3G34DCT, SN74LVC3G34DCU, SN74LVC3G34YZP), all sharing identical 1A/1Y/2A/2Y/3A/3Y/GND/V_CC assignments in their respective packages.