Texas Instruments SN74LVC3G34DCTR

Overview

SN74LVC3G34DCTR 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 with ±24-mA output drive at 3.3 V, 4.1-ns max propagation delay at 3.3 V, and 5.5-V tolerant inputs - used in portable audio signal routing, SSD control interfaces, and embedded PC level-shifting applications.

For engineers reviewing the SN74LVC3G34DCTR datasheet, SN74LVC3G34DCTR pinout, SN74LVC3G34DCTR application, or SN74LVC3G34DCTR equivalent, key selection criteria include I_off partial-power-down support, NanoFree™ SM8 package compatibility, 3.3-V/5-V mixed-voltage interface capability, and guaranteed 24-mA sink/source drive per channel under industrial temperature range (–40°C to 125°C).

Technical Context

The SN74LVC3G34DCTR integrates three independent CMOS buffer stages with rail-to-rail input voltage tolerance up to 5.5 V and output compliance to V_CC, enabling down-translation from higher-voltage domains into lower-V_CC logic systems. Its I_off circuitry actively disables outputs during power-down, blocking back-current flow and supporting live insertion.

Each buffer exhibits matched rise/fall times (Δt/Δv ≤ 10 ns/V at 3.3 V), low dynamic power dissipation (C_pd = 19 pF at 3.3 V), and robust ESD protection (2500-V HBM, 1500-V CDM), making it suitable for high-speed, noise-sensitive digital interconnects in compact portable designs.

Key Specifications

Pinout & Package

SN74LVC3G34DCTR uses the 8-pin SM8 (Small Outline Package) with 2.95 mm × 2.80 mm body size and 0.65-mm lead pitch. The package features gull-wing leads, exposed thermal pad (not electrically connected), and pin 1 identification via beveled corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC3G34DCTR, SN74LVC3G34DCUR offers smaller footprint but marginally reduced thermal performance, while 74LVC3G34GW,125 trades verified I_off support for AOI-friendly packaging - making SN74LVC3G34DCTR the optimal choice for thermally demanding, hot-pluggable systems requiring full I_off compliance.

Availability

SN74LVC3G34DCTR is available at Aetrix Electronics and suitable for portable audio, SSD control, and embedded PC applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant tape-and-reel delivery.

Supply support for SN74LVC3G34DCTR 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 50 years of innovation in logic and interface solutions.

The SN74LVC3G34 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed interoperability across mixed-voltage digital systems in consumer, industrial, and computing applications.

FAQ

What is the maximum operating temperature for SN74LVC3G34DCTR?

The SN74LVC3G34DCTR is rated for operation from –40°C to 125°C ambient temperature, validated per JEDEC JESD78 latch-up testing and thermal characterization in the DCT package. This rating applies to all three buffer channels simultaneously under full load conditions and is documented in Section 6.3 of the SCES366L datasheet.

Does SN74LVC3G34DCTR support level translation between 5-V and 3.3-V logic domains?

Yes, SN74LVC3G34DCTR supports down-translation: its inputs tolerate up to 5.5 V regardless of V_CC, so a 5-V signal applied to 1A while V_CC = 3.3 V produces a valid 3.3-V output at 1Y. It does not support up-translation - outputs cannot exceed V_CC.

What is the purpose of the I_off feature in SN74LVC3G34DCTR?

The I_off feature in SN74LVC3G34DCTR disables all three outputs when V_CC = 0 V, limiting input/output leakage current to ±10 µA. This prevents damaging back-current flow during hot-swap, partial power-down, or system sleep states - critical for PCIe add-in cards and modular SSD enclosures.

Can unused inputs on SN74LVC3G34DCTR be left floating?

No, unused inputs on SN74LVC3G34DCTR must be tied to either V_CC or GND. Floating CMOS inputs cause undefined logic states, increased power consumption, and potential oscillation. TI Application Report SCBA004 explicitly mandates biasing all unused inputs to ensure stable operation and prevent ESD-induced latch-up.

What is the typical power dissipation capacitance (C_pd) of SN74LVC3G34DCTR at 3.3 V?

The typical power dissipation capacitance (C_pd) of SN74LVC3G34DCTR is 19 pF at V_CC = 3.3 V and f = 10 MHz, as measured per JEDEC JESD8-7. This value reflects dynamic power consumption during switching and is used to calculate total supply current in high-frequency applications like I²S clock buffering.