onsemi MC74VHC1GT125MU1TCG

Overview

MC74VHC1GT125MU1TCG from onsemi is a single non-inverting 3-state buffer with TTL-level input thresholds, designed for level-shifting between 2.0 V and 5.5 V logic domains. It delivers 3.5 ns typical propagation delay at 5 V, supports ±8 mA output drive at 3.0 V, and features over-voltage tolerant inputs/outputs up to 5.5 V - enabling safe interfacing of 5 V circuits to 3 V systems in portable and mixed-voltage embedded designs.

For engineers reviewing the MC74VHC1GT125MU1TCG datasheet, pinout, applications, or equivalent options, key selection considerations include its TTL-compatible VIH/VIL thresholds (1.4 V / 0.45 V at 3.0 V), IOFF partial power-down protection, UDFN6 1.45 × 1.0 mm package with 0.5 mm pitch, and guaranteed operation from −55 °C to +125 °C.

Technical Context

The MC74VHC1GT125MU1TCG implements a three-stage CMOS buffer architecture with a controlled-impedance 3-state output stage, delivering high noise immunity and stable rail-to-rail switching. Its input structure withstands voltages up to 5.5 V independent of VCC, and its output stage remains protected even when VCC = 0 V or VOUT exceeds VCC - critical for hot-swap and battery-backup scenarios.

This device operates across 2.0 V–5.5 V supply range with guaranteed AC performance: tPLH/tPHL ≤ 5.5 ns (CL = 15 pF, VCC = 4.5–5.5 V), tPZL/tPLZ ≤ 6.8 ns, and tPZH/tPHZ ≤ 5.1 ns. Input leakage remains ≤ ±1.0 µA over full temperature range, and IOFF limits power-off current to ≤10 µA, supporting robust partial-power-down system design.

Key Specifications

Pinout & Package

MC74VHC1GT125MU1TCG is housed in a 6-pin UDFN package (Case 517AQ) with exposed thermal pad, measuring 1.45 mm × 1.0 mm × 0.5 mm and featuring 0.5 mm lead pitch. Pin 1 is marked by a dot or beveled edge per JEDEC MO-229 standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-inverting 3-state buffer applications.

Compared with SN74LVC1G125DBVR and 74AUP1G125GW,125, the MC74VHC1GT125MU1TCG uniquely combines TTL-level input compatibility, 5.5 V over-voltage tolerance, and −55 °C to +125 °C operation - making it the only option among the three qualified for automotive-grade mixed-supply signal conditioning without external protection.

Availability

MC74VHC1GT125MU1TCG is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, portable medical devices, and IoT edge node power management requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for MC74VHC1GT125MU1TCG 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

onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC74VHC1GT125MU1TCG belongs to onsemi's VHC logic family - engineered for high-speed, low-power, mixed-voltage interoperability in space-constrained embedded systems requiring robust signal integrity and extended temperature reliability.

FAQ

What is the input voltage threshold behavior of the MC74VHC1GT125MU1TCG?

The MC74VHC1GT125MU1TCG features TTL-level input thresholds: VIH = 1.4 V and VIL = 0.45 V at VCC = 3.0 V. This allows reliable recognition of standard 5 V TTL logic levels when operating from a 3.3 V supply. The thresholds scale with VCC but maintain TTL compatibility across the full 2.0–5.5 V range, unlike CMOS-input variants such as the MC74VHC1G125.

Does the MC74VHC1GT125MU1TCG support hot-swap or partial power-down operation?

Yes, the MC74VHC1GT125MU1TCG supports partial power-down via its IOFF feature: when VCC = 0 V, input and output leakage is limited to ≤10 µA, preventing back-current into powered domains. Its inputs and outputs tolerate up to 5.5 V regardless of VCC state - enabling safe hot-insertion in modular systems and battery-backed subsystems without external protection.

What is the maximum propagation delay for the MC74VHC1GT125MU1TCG under worst-case conditions?

The MC74VHC1GT125MU1TCG guarantees tPLH/tPHL ≤ 8.5 ns at VCC = 4.5–5.5 V and CL = 15 pF over the full −55 °C to +125 °C temperature range. At 3.0–3.6 V and same load, delay is ≤9.5 ns. These values include process, voltage, and temperature extremes - not just typical conditions - ensuring timing predictability in mission-critical applications.

Can the MC74VHC1GT125MU1TCG be used to interface 5 V and 3.3 V logic domains without external components?

Yes, the MC74VHC1GT125MU1TCG is explicitly designed for this purpose. Its inputs and outputs tolerate up to 5.5 V regardless of VCC, and its TTL-level thresholds ensure correct interpretation of 5 V signals when powered from 3.3 V. No level-shifter ICs, resistive dividers, or clamping diodes are required - simplifying design and reducing BOM cost.

What is the thermal performance of the MC74VHC1GT125MU1TCG in its UDFN6 package?

In the UDFN6 1.45 × 1.0 mm package (Case 517AQ), the MC74VHC1GT125MU1TCG has a junction-to-ambient thermal resistance (θJA) of 154 °C/W under JEDEC JESD51-7 conditions. With its 812 mW maximum power dissipation in still air, this enables reliable operation at full speed even in compact enclosures - provided PCB layout includes adequate copper pour under the exposed thermal pad.