onsemi MC74VHC1G03DFT2G

Overview

MC74VHC1G03DFT2G from onsemi is a single 2-input NOR gate with open-drain output in SC-88A (SOT-353) package, operating from 2.0 V to 5.5 V supply, delivering 3.5 ns typical propagation delay at 5 V, supporting 8 mA output drive at 3.0 V, and enabling level-shifting between 3 V and 5 V logic domains in interface circuits.

For engineers reviewing the MC74VHC1G03DFT2G datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain output compatibility with wired-OR bus structures, overvoltage-tolerant inputs up to 5.5 V independent of V_CC, IOFF partial power-down protection, and −55 °C to +125 °C industrial temperature operation.

Technical Context

This device implements standard positive-logic NOR functionality (Y = NOT(A OR B)) with an open-drain output stage requiring an external pull-up resistor. Its input structure tolerates voltages up to 5.5 V regardless of V_CC, enabling safe interfacing between mixed-voltage systems such as 5 V microcontrollers driving 3 V peripherals.

The output supports tri-state behavior only via logic control - no dedicated enable pin - and exhibits IOFF protection that limits leakage to ≤10 µA when V_CC = 0 V, preventing back-powering of powered-down rails during hot insertion or battery-backup scenarios.

Key Specifications

Pinout & Package

MC74VHC1G03DFT2G is housed in the SC-88A (SOT-353) package: 2.0 mm × 1.25 mm × 0.95 mm body, 0.65 mm pitch, lead-free and RoHS compliant.

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, MC74VHC1G03DFT2G uniquely supports true 5 V-tolerant inputs across its full 2.0–5.5 V supply range while maintaining industrial temperature rating and open-drain drive strength - making it the only choice for mixed-voltage industrial control and automotive interface applications requiring robustness without external protection components.

Availability

MC74VHC1G03DFT2G is available at Aetrix Electronics and suitable for industrial sensor aggregation, automotive body control modules, programmable logic enable control, and legacy system voltage translation requiring stable component supply and long-term lifecycle support.

Supply support for MC74VHC1G03DFT2G 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC74VHC1G03DFT2G belongs to the VHC (Very High Speed CMOS) logic family, designed specifically for low-power, high-speed interface and signal-combining functions in space-constrained, mixed-voltage embedded systems.

FAQ

What is the maximum input voltage allowed on MC74VHC1G03DFT2G when V_CC = 2.0 V?

The MC74VHC1G03DFT2G supports DC input voltages up to 5.5 V regardless of V_CC level, including at 2.0 V operation. This overvoltage tolerance is achieved through internal input protection structures and is explicitly specified in the Absolute Maximum Ratings table. It allows safe connection of 5 V signals to the A or B inputs without external clamping, making MC74VHC1G03DFT2G suitable for bridging logic domains in mixed-supply systems.

Does MC74VHC1G03DFT2G have a true tri-state output mode?

No, MC74VHC1G03DFT2G does not feature a dedicated tri-state enable input. Its output is open-drain only and transitions between active-low sink and high-impedance (open) states based solely on logic evaluation of inputs A and B. When both inputs are low (A = B = L), the output goes high-impedance (Z); otherwise, it pulls low. There is no separate control pin to force high-impedance independently of logic state - so MC74VHC1G03DFT2G is not a tri-state buffer but a combinational open-drain NOR gate.

Can MC74VHC1G03DFT2G be used to replace a standard push-pull NOR gate in an existing design?

MC74VHC1G03DFT2G cannot serve as a direct drop-in replacement for a push-pull-output NOR gate because its output is open-drain and requires an external pull-up resistor to achieve logic-high levels. If the original design relies on active high drive capability, adding a pull-up (typically 1–10 kΩ to V_CC or another rail) is mandatory. However, this change enables wired-OR functionality and voltage-level flexibility - advantages absent in push-pull variants. Always verify timing and loading effects after adding the pull-up when migrating to MC74VHC1G03DFT2G.

What is the recommended pull-up resistor value for MC74VHC1G03DFT2G output in a 3.3 V system?

For a 3.3 V system, a 4.7 kΩ pull-up resistor is recommended for MC74VHC1G03DFT2G to balance rise time and power consumption. With 8 mA sink capability at 3.0 V, this value ensures VOL ≤ 0.44 V under full load while keeping quiescent current below 0.7 mA when output is low. For faster rise times in low-capacitance nets (<10 pF), 2.2 kΩ may be used; for ultra-low power or high fan-out, 10 kΩ is acceptable if rise time constraints allow. The exact value must be validated against trace capacitance and required edge rate in the final layout.

Is MC74VHC1G03DFT2G suitable for automotive applications per AEC-Q100?

MC74VHC1G03DFT2G is not AEC-Q100 qualified. While it operates across −55 °C to +125 °C and is used in automotive body control modules, onsemi does not list this specific variant under its AEC-Q100 stress-tested product portfolio. For production automotive applications requiring qualification, engineers should select the AEC-Q100 qualified variant MC74VHC1G03DTT1G (in SC-74A package) or consult onsemi's automotive-grade logic roadmap. MC74VHC1G03DFT2G remains appropriate for non-safety-critical prototyping, aftermarket modules, or industrial systems with equivalent thermal and reliability demands.