onsemi MC74VHC1G135DFT2

Overview

MC74VHC1G135DFT2 from onsemi is a single 2-input Schmitt-trigger NAND gate with open-drain output, designed for level-shifting and noise-immune signal conditioning in mixed-voltage systems. It operates from 2.0 V to 5.5 V, delivers 4.9 ns typical propagation delay at 5 V, supports ±8 mA I_O at 3.0 V, and features overvoltage-tolerant inputs/outputs up to 5.5 V - enabling robust interfacing between 3 V and 5 V logic domains in industrial control and sensor interface circuits.

For engineers reviewing the MC74VHC1G135DFT2 datasheet, pinout, applications, or equivalent options, key selection criteria include its Schmitt-trigger hysteresis (0.3–2.25 V), IOFF partial power-down capability, SC-74A package footprint, and open-drain output compatibility with wired-AND bus architectures and pull-up-based voltage translation.

Technical Context

The MC74VHC1G135DFT2 implements a three-stage CMOS architecture with buffered output and Schmitt-trigger input thresholds (VT+ = 2.2–3.85 V, VT− = 0.9–1.65 V at V_CC = 3.0–5.5 V), delivering 0.3–2.25 V hysteresis for reliable noise rejection in slow-rising or noisy signal environments. Its open-drain output enables flexible termination and multi-source bus driving without contention.

Input structures tolerate up to 5.5 V regardless of V_CC, supporting hot-swap and battery-backup scenarios; IOFF functionality ensures <1.0 µA leakage when V_CC = 0 V, preventing back-powering of powered-down rails. The device is fabricated using silicon-gate CMOS technology with chip complexity under 100 FETs.

Key Specifications

Pinout & Package

MC74VHC1G135DFT2 is housed in the SC-74A (SOT-23-5) surface-mount package (3.00 × 1.50 × 0.95 mm, 0.95 mm pitch), optimized for space-constrained PCB layouts and compatible with standard SMT reflow profiles. Pin 1 is marked by a dot or beveled edge per JEDEC MO-178.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schmitt-trigger NAND gate applications.

Compared with SN74LVC1G135DBVR and 74AUP1G135GW,125, the MC74VHC1G135DFT2 uniquely combines 5.5 V overvoltage tolerance, IOFF, and Schmitt hysteresis in SC-74A - making it the only option among the three qualified for industrial hot-swap and mixed-voltage interface applications without additional protection circuitry.

Availability

MC74VHC1G135DFT2 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller GPIO expansion, hot-swappable module detection, and legacy bus level translation requiring stable component supply across extended temperature ranges (−55 °C to +125 °C).

Supply support for MC74VHC1G135DFT2 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC74VHC1G135DFT2 belongs to the VHC (Very High Speed CMOS) logic family, engineered for low-power, high-noise-immunity digital interfacing in harsh industrial and automotive environments where reliability across wide voltage and temperature ranges is critical.

FAQ

What is the maximum input voltage the MC74VHC1G135DFT2 can tolerate regardless of V_CC?

The MC74VHC1G135DFT2 supports input voltages up to 5.5 V independently of the V_CC supply level - confirmed in the Absolute Maximum Ratings table and reinforced by overvoltage-tolerant input structure design. This allows safe connection of 5 V signals to the device even when V_CC is set to 3.3 V or 2.5 V, eliminating the need for external clamping diodes in mixed-voltage systems.

Does the MC74VHC1G135DFT2 support partial power-down operation?

Yes, the MC74VHC1G135DFT2 features IOFF circuitry that limits input/output leakage to ≤1.0 µA when V_CC = 0 V, as specified in the DC Electrical Characteristics table. This enables safe use in modular systems where one section may be powered down while others remain active - preventing back-current flow and ensuring predictable behavior during hot-insertion events.

What is the typical propagation delay of the MC74VHC1G135DFT2 at 3.3 V supply?

At V_CC = 3.3 V (within the 3.0–3.6 V range), the MC74VHC1G135DFT2 exhibits a typical propagation delay (t_PZL/t_PLZ) of 7.6 ns with C_L = 15 pF, per the AC Electrical Characteristics table. This value reflects consistent timing performance across the industrial temperature range (−40 °C to +85 °C), with worst-case delay bounded at 14.0 ns under same conditions.

Can the MC74VHC1G135DFT2 drive a standard 10 kΩ pull-up resistor on a 3.3 V bus?

Yes - the MC74VHC1G135DFT2 can sink up to 8 mA at V_CC = 3.0 V (DC Electrical Characteristics), which corresponds to a guaranteed low-level output voltage (V_OL) ≤0.44 V when sinking 8 mA. Driving a 10 kΩ pull-up to 3.3 V draws only 0.33 mA, well within spec and ensuring robust logic-low assertion with margin.

Is the MC74VHC1G135DFT2 RoHS compliant and lead-free?

Yes, the MC74VHC1G135DFT2 is explicitly stated as Pb-free, halogen-free/BFR-free, and RoHS compliant in the datasheet Features section and ordering information. The "G" suffix in part marking (e.g., MC74VHC1G135DBVT1G) denotes RoHS-compliant packaging, and the device meets IPC-J-STD-609A Class 1 requirements for lead-free assembly.