Nexperia USA Inc. 74HCT3G34DC,125

Overview

74HCT3G34DC,125 from Nexperia is a triple non-inverting buffer gate in VSSOP8 (SOT765-1) package, designed for level translation and signal conditioning in 5 V TTL-compatible digital systems. It features TTL-level inputs (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), 4.0 mA output drive capability, -40 °C to +125 °C operating range, and input clamp diodes enabling safe interfacing with voltages exceeding VCC - used in industrial control I/O expansion and sensor interface logic staging.

For engineers reviewing the 74HCT3G34DC,125 datasheet, 74HCT3G34DC,125 pinout, 74HCT3G34DC,125 application, or 74HCT3G34DC,125 equivalent, key selection criteria include TTL-compatible input thresholds, 25 ns max propagation delay at 4.5 V, VSSOP8 thermal performance (4.9 mW/K derating above 99 °C), and compliance with JESD7A and JEDEC JS-001 Class 2 ESD (2000 V HBM).

Technical Context

This device implements three independent CMOS-based non-inverting buffers with TTL-compatible input thresholds, allowing direct connection to legacy 5 V TTL logic without level shifters. Each channel supports rail-to-rail output swing and includes integrated input clamp diodes for overvoltage tolerance up to VCC + 0.5 V.

It operates across 4.5–5.5 V supply range with static VIH/VIL defined per JEDEC standards, and delivers 4.0 mA sink/source capability at VOH ≥ 3.7 V and VOL ≤ 0.4 V under load - enabling reliable driving of multiple 74-series inputs or small capacitive loads (<50 pF) in mixed-voltage subsystems.

Key Specifications

Pinout & Package

VSSOP8 package (SOT765-1): plastic very thin shrink small outline, 8 leads, body width 2.3 mm, lead pitch 0.5 mm, pin 1 index in lower-left corner below marking "U34".

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT3G34DC,125, the 74LVC3G34GW,125 offers wider voltage flexibility but requires external level adaptation for pure TTL source compatibility, while SN74LVC3G34DCUR improves ESD margin and output voltage precision at the cost of stricter layout requirements for thermal management in high-density designs.

Availability

74HCT3G34DC,125 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, motor control interface logic, and legacy system bus interface requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT3G34DC,125 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HCT3G34 belongs to Nexperia's high-speed TTL-compatible logic family, engineered specifically for seamless integration into legacy 5 V digital systems undergoing incremental modernization with low-power microcontrollers.

FAQ

What is the maximum clock frequency supported by the 74HCT3G34DC,125?

The 74HCT3G34DC,125 is not a clocked device but a combinational buffer; its usable frequency depends on propagation delay and load. With 29 ns max tPD at 4.5 V and 50 pF load, it supports reliable operation up to ~17 MHz for repetitive square-wave signals, assuming adequate signal integrity and decoupling.

Can the 74HCT3G34DC,125 drive a 50 pF capacitive load at 5 V?

Yes - the device is characterized with 50 pF load in its dynamic test conditions (Table 10). At VCC = 4.5 V, it delivers 23 ns typical propagation delay and 19 ns typical transition time into 50 pF, meeting timing requirements for most microcontroller peripheral interfaces and medium-speed control buses.

Is the 74HCT3G34DC,125 pin-compatible with the 74HC3G34DC,125?

Yes - both share identical VSSOP8 (SOT765-1) pinout and footprint. However, the 74HC3G34DC uses CMOS input thresholds (VIH = 3.15 V min at 4.5 V), whereas the 74HCT3G34DC uses TTL thresholds (VIH = 2.0 V min), making them electrically interchangeable only when driven by true TTL sources.

Does the 74HCT3G34DC,125 require external pull-up or pull-down resistors on unused inputs?

No - unused inputs may be tied directly to VCC or GND. The device has no internal pull resistors, but its high input impedance (<1 μA leakage) and defined VIH/VIL thresholds ensure stable logic states without external biasing, simplifying PCB layout in space-constrained applications.