onsemi MC74VHC1G126P5T5G

Overview

MC74VHC1G126P5T5G from onsemi is a single-channel noninverting 3-state buffer IC designed for level-shifting and bus isolation in mixed-voltage systems. It operates from 2.0 V to 5.5 V, delivers 3.5 ns propagation delay at 5 V (typ), supports ±8 mA output drive at 3.0 V, and features overvoltage-tolerant inputs/outputs up to 5.5 V-enabling safe interfacing between 5 V and 3 V logic domains in portable instrumentation and industrial control I/O modules.

For engineers reviewing the MC74VHC1G126P5T5G datasheet, pinout, applications, or equivalent options, key selection criteria include its CMOS-level input thresholds, IOFF partial power-down protection, SC-953 package footprint, guaranteed −55°C to +125°C operation, and compatibility with high-noise industrial signal routing.

Technical Context

The MC74VHC1G126P5T5G implements a three-stage buffered architecture with a controlled 3-state output stage, delivering high noise immunity and stable switching behavior. Its input structure withstands voltages up to 5.5 V independent of VCC, enabling robust 5 V-to-3 V translation without external clamping.

Output structures support operation with VCC = 0 V and tolerate output voltages exceeding VCC, preventing latch-up or damage during hot insertion, battery backup transitions, or supply sequencing mismatches-critical for field-replaceable modules and programmable logic interfaces.

Key Specifications

Pinout & Package

MC74VHC1G126P5T5G is housed in the SOT-953 (Case 527AE) 5-pin ultra-small surface-mount package (1.00 mm × 0.80 mm × 0.37 mm, 0.35 mm pitch), optimized for space-constrained PCB layouts in wearables and sensor nodes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G126DBVR and 74AUP1G126GW,125, the MC74VHC1G126P5T5G uniquely combines 5.5 V I/O tolerance, −55°C to +125°C operation, and IOFF protection-making it the only choice for ruggedized mixed-supply industrial and automotive control interfaces requiring guaranteed interoperability across voltage domains.

Availability

MC74VHC1G126P5T5G is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, portable medical instrumentation, and programmable logic I/O expansion requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for MC74VHC1G126P5T5G 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 (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC74VHC1G126P5T5G belongs to onsemi's VHC logic family-engineered for high-speed, low-power, mixed-voltage interfacing in harsh-environment electronics where reliability, small size, and voltage translation are critical.

FAQ

What is the maximum input voltage rating for MC74VHC1G126P5T5G?

The MC74VHC1G126P5T5G supports DC input voltages from −0.5 V to +5.5 V, independent of VCC. This overvoltage tolerance allows safe connection to 5 V signals even when powered from 2.0 V or 3.3 V, eliminating external protection components in mixed-voltage designs. The specification is validated across the full −55°C to +125°C operating range and is explicitly confirmed in the Absolute Maximum Ratings table of the official onsemi datasheet (Rev. 27, January 2026).

Does MC74VHC1G126P5T5G support partial power-down functionality?

Yes, MC74VHC1G126P5T5G implements IOFF circuitry that limits power-off leakage current to ≤10 µA when VCC = 0 V and an input or output is driven to 5.5 V. This prevents back-powering of inactive supply rails during system sleep or hot-swap events. The feature is documented in the DC Electrical Characteristics table and applies to both input and output terminals, making MC74VHC1G126P5T5G suitable for systems requiring strict power domain isolation.

What is the propagation delay of MC74VHC1G126P5T5G at 3.3 V operation?

At VCC = 3.3 V and CL = 15 pF, the typical propagation delay (tPLH/tPHL) of MC74VHC1G126P5T5G is 4.5 ns, with a maximum of 9.5 ns over the −40°C to +85°C range and 12.0 ns over −55°C to +125°C. These values are measured under standard AC test conditions defined in the onsemi datasheet (Rev. 27, page 6) and reflect the device's performance in real-world 3.3 V digital interfaces such as SPI clock distribution or GPIO expansion paths.

Which package type does MC74VHC1G126P5T5G use, and what are its dimensions?

MC74VHC1G126P5T5G uses the SOT-953 package (Case 527AE), measuring 1.00 mm × 0.80 mm × 0.37 mm with 0.35 mm lead pitch. This ultra-compact 5-pin footprint is specified in the onsemi ordering information table (page 8) and mechanical drawings (page 11). Its small size supports high-density PCB layouts in space-constrained applications like wearable sensors and modular I/O cards, while maintaining compatibility with standard reflow soldering processes.

Is MC74VHC1G126P5T5G qualified for automotive applications?

Yes, MC74VHC1G126P5T5G is AEC-Q100 qualified and PPAP capable when ordered with the −Q suffix (e.g., MC74VHC1G126P5T5G−Q). While the base part number MC74VHC1G126P5T5G shares the same die and electrical specifications, automotive qualification requires the −Q variant which undergoes additional stress testing and process controls. The qualification status and requirements are detailed in the Features section (page 1) and Ordering Information (page 8) of the official onsemi datasheet.