Texas Instruments SN74LVC3G34DCURG4

Overview

SN74LVC3G34 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 PC signal routing.

For engineers reviewing the SN74LVC3G34 datasheet, SN74LVC3G34 pinout, SN74LVC3G34 application, or SN74LVC3G34 equivalent, key selection criteria include I_off-enabled partial-power-down capability, NanoFree™ VSSOP (DCU) package compatibility, 3.3-V high-speed buffering with ground bounce <0.8 V, and down-translation from 5.5-V inputs to lower V_CC rails.

Technical Context

The SN74LVC3G34 implements three independent CMOS buffer stages with balanced rise/fall times and rail-to-rail output swing. Each channel features input overvoltage tolerance up to 5.5 V independent of V_CC, allowing interoperability between mixed-voltage domains.

Its I_off circuitry actively disables outputs when V_CC = 0 V, blocking current backflow during live insertion or partial power-down - critical for hot-swap interfaces in SSDs and telecom AC/DC controllers.

Key Specifications

Pinout & Package

VSSOP (DCU) 8-pin package: 2.30 mm × 2.00 mm body, 0.65-mm lead pitch, 1.3-mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G34DBVR, the SN74LVC3G34 integrates three buffers in one VSSOP-8 package - reducing PCB area by ~60% and interconnect inductance. Against 74LVC3G34GW,125, it offers identical functional performance but differs in qualification scope and thermal metrics (R_θJA = 227°C/W vs. 210°C/W), affecting derating in high-density layouts.

Availability

SN74LVC3G34DCURG4 is available at Aetrix Electronics and suitable for portable audio docks, embedded PCs, and solid-state drive control logic requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for SN74LVC3G34DCURG4 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 connectivity technologies with over 90 years of innovation in power management and signal chain solutions.

The SN74LVC3G34 belongs to TI's LVC logic family, engineered for low-voltage, high-speed buffering in portable and space-constrained electronics - emphasizing voltage translation, power-down safety, and minimal footprint.

FAQ

What is the maximum operating temperature for SN74LVC3G34DCURG4?

The SN74LVC3G34DCURG4 is rated for operation from –40°C to +125°C ambient temperature in its VSSOP (DCU) package. This range is validated per JEDEC JESD78 latch-up testing and thermal characterization, making it suitable for industrial embedded PCs and telecom power controllers where extended thermal margins are required. The device's R_θJA of 227°C/W defines its power dissipation limits under these conditions.

Does SN74LVC3G34DCURG4 support level translation between 5-V and 3.3-V logic domains?

Yes, the SN74LVC3G34DCURG4 supports down-translation: its inputs tolerate voltages up to 5.5 V regardless of V_CC level, allowing 5-V signals to be safely applied while V_CC is set to 3.3 V, 2.5 V, or 1.8 V. The outputs swing rail-to-rail within the V_CC domain, enabling clean interfacing to downstream 3.3-V receivers without external resistors or translators.

How does the I_off feature function in SN74LVC3G34DCURG4 during power-down?

The I_off circuitry in SN74LVC3G34DCURG4 automatically disables all three outputs when V_CC drops to 0 V, limiting input/output leakage to ±10 µA maximum. This prevents damaging current backflow from live 5-V buses into a powered-down system - a critical requirement for hot-plug SSD modules and enterprise tablets undergoing dynamic power sequencing.

What is the typical propagation delay of SN74LVC3G34DCURG4 at 3.3-V supply?

The typical propagation delay (t_pd) of SN74LVC3G34DCURG4 is 1.4 ns at V_CC = 3.3 V and 25°C, with a maximum of 4.1 ns across –40°C to +85°C. This value is measured under standard load conditions (30 pF, 500-Ω termination) and ensures reliable timing in high-speed digital paths such as I²S clock distribution in audio docks and baseband control in wireless headsets.

Can unused inputs on SN74LVC3G34DCURG4 be left floating?

No, unused inputs on SN74LVC3G34DCURG4 must be tied to either V_CC or GND to prevent undefined logic states and excessive ICC. Floating CMOS inputs cause increased power consumption, oscillation, and potential damage due to intermediate voltage levels. TI's application report SCBA004 explicitly mandates biasing all unused inputs - a requirement verified in the device's recommended operating conditions table.