onsemi MC74VHC1G03DTT1G

Overview

MC74VHC1G03DTT1G from onsemi is a single 2-input NOR gate with open-drain output, designed for level-shifting and wired-OR logic in mixed-voltage systems. It operates from 2.0 V to 5.5 V, delivers 3.5 ns typical propagation delay at 5 V, supports 8 mA output drive at 3.0 V, and features overvoltage-tolerant inputs up to 5.5 V - enabling reliable interfacing between 5 V and 3 V circuits in power management and bus control applications.

For engineers reviewing the MC74VHC1G03DTT1G datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain compatibility with I²C and SMBus, input overvoltage tolerance for hot-swap safety, IOFF partial power-down protection, and SC-74A (SOT-23-5) package suitability for space-constrained PCB layouts.

Technical Context

This device implements a CMOS-based NOR logic function with an open-drain output stage, requiring an external pull-up resistor to define the high logic level. Its input structure tolerates voltages up to 5.5 V independent of VCC, allowing safe operation when interfacing higher-voltage signal sources into lower-supply domains.

The IC supports partial power-down via IOFF, which disables input and output leakage paths when VCC = 0 V - critical for backplane and modular system designs where live insertion occurs. Propagation delays are specified across 3.0–3.6 V and 4.5–5.5 V supply ranges, with load-dependent timing (CL = 15 pF or 50 pF) confirming performance in both low-capacitance sensor interfaces and higher-drive bus applications.

Key Specifications

Pinout & Package

MC74VHC1G03DTT1G is packaged in SC-74A (SOT-23-5), a surface-mount 5-pin package with 0.95 mm pitch and moisture sensitivity level 1. Pin 1 is marked by a dot or beveled edge; orientation follows JEDEC standard for tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NOR gate with open-drain output applications.

Compared with SN74LVC1G03DBVR and 74AUP1G03GW,125, the MC74VHC1G03DTT1G uniquely combines 5.5 V input tolerance with open-drain output and industrial temperature range - making it the only option among the three that safely bridges 5 V and 3.3 V logic without additional components.

Availability

MC74VHC1G03DTT1G is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded power management systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MC74VHC1G03DTT1G 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 MC74VHC1G03DTT1G belongs to the VHC logic family - engineered for high-speed, low-power, mixed-voltage interoperability in space-constrained embedded systems where reliability under voltage mismatch is critical.

FAQ

What is the maximum input voltage allowed on pins A and B of the MC74VHC1G03DTT1G?

The MC74VHC1G03DTT1G supports DC input voltages up to 5.5 V on pins A and B, regardless of the VCC supply voltage. This overvoltage tolerance is explicitly guaranteed in the datasheet's Maximum Ratings table and enables safe interfacing with 5 V logic even when VCC is set to 2.0 V or 3.3 V - a key differentiator versus standard LVC or AUP logic families.

Does the MC74VHC1G03DTT1G support partial power-down functionality?

Yes, the MC74VHC1G03DTT1G implements IOFF partial power-down protection. When VCC = 0 V, input and output leakage currents are limited to ≤10 µA, preventing unwanted current flow through the device during hot insertion or module removal. This behavior is verified in the DC Electrical Characteristics table under the IOFF parameter.

Can the MC74VHC1G03DTT1G be used as an I²C bus level shifter?

Yes, the MC74VHC1G03DTT1G is commonly deployed as an I²C level shifter due to its open-drain output and 5.5 V input tolerance. With appropriate pull-up resistors on both sides of the bus, it allows bidirectional communication between 3.3 V masters and 5 V slaves - confirmed by onsemi's application guidance for mixed-voltage I²C systems.

What is the propagation delay of the MC74VHC1G03DTT1G at 3.3 V supply?

At VCC = 3.3 V (within the 3.0–3.6 V range), the MC74VHC1G03DTT1G exhibits a typical propagation delay of 5.6 ns and a maximum of 9.5 ns for tPZL (input-to-output low), and 6.5 ns typical / 11.5 ns max for tPLZ (input-to-output high), measured with CL = 15 pF. These values are specified in the AC Electrical Characteristics table and validated across −40 °C to +85 °C.

Which package type does the MC74VHC1G03DTT1G use, and what are its dimensions?

The MC74VHC1G03DTT1G uses the SC-74A (SOT-23-5) package, measuring 3.00 mm × 1.50 mm × 0.95 mm with 0.95 mm lead pitch. This mechanical outline is documented in the datasheet's Package Dimensions section (Case 318BQ), and the part marking includes "VP" followed by date code and Pb-free indicator "G".