Toshiba Semiconductor and Storage 74VHC244FT

Overview

74VHC244FT from Toshiba Electronic Devices & Storage Corporation is a non-inverting octal 3-state bus buffer with two active-low output enables, designed for bidirectional data bus interfacing in memory and peripheral systems. It operates across 2.0–5.5 V supply, delivers 3.9 ns typical propagation delay at 5 V, supports -40°C to +125°C operation, and features input overvoltage tolerance up to 5.5 V - enabling robust 5 V/3 V mixed-supply system interfacing.

For engineers reviewing the 74VHC244FT datasheet, 74VHC244FT pinout, 74VHC244FT application, or 74VHC244FT equivalent, key selection criteria include its non-inverting logic function, dual OE control, TSSOP20B package footprint, AEC-Q100 qualification, and guaranteed 3-state leakage < ±0.25 µA at 25°C - critical for low-power bus hold and hot-swap designs.

Technical Context

The 74VHC244FT implements eight independent non-inverting buffer channels, each controlled by one of two shared active-low output enable (OE) inputs - OE1 controls Y1–Y4, OE2 controls Y5–Y8. Its C2MOS silicon gate process enables TTL-compatible speed with CMOS power efficiency, and balanced tPLH/tPHL ensures minimal skew between rising/falling edges.

Input protection circuitry allows safe application of 0–5.5 V signals regardless of VCC, supporting level translation between 3.3 V and 5 V domains without external components. The device maintains high noise immunity (VIH/VIL thresholds at 70%/30% VCC min) and includes power-down protection on all inputs to prevent latch-up during power sequencing.

Key Specifications

Pinout & Package

TSSOP20B - 20-pin thin shrink small outline package (4.4 mm × 6.5 mm, 0.65 mm pitch), surface-mount, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and 74HC244D,653, the 74VHC244FT uniquely combines 5 V tolerance, AEC-Q100 qualification, and 3.9 ns speed - making it the only option qualified for automotive 5 V bus interfacing with guaranteed mixed-voltage robustness.

Availability

74VHC244FT is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O expansion, medical imaging interfaces, and test equipment backplanes requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74VHC244FT 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

Toshiba Electronic Devices & Storage Corporation is a global semiconductor manufacturer specializing in high-reliability logic, power, and memory solutions for automotive, industrial, and consumer applications.

The 74VHC series targets high-speed, low-power CMOS logic interfacing - specifically engineered for noise-immune, mixed-voltage bus buffering in demanding automotive and industrial control systems.

FAQ

What is the logic function and output behavior of the 74VHC244FT?

The 74VHC244FT is a non-inverting octal 3-state bus buffer with two independent active-low output enables (OE1 and OE2). When an OE is low, its four associated outputs (Y1–Y4 or Y5–Y8) replicate their respective inputs (A1–A4 or A5–A8) with non-inverted logic; when high, those outputs enter high-impedance state. This enables bidirectional bus control without polarity inversion.

Does the 74VHC244FT support mixed-voltage interfacing between 3.3 V and 5 V systems?

Yes. The 74VHC244FT accepts input voltages from 0 V to 5.5 V regardless of VCC value, allowing direct connection of 5 V signals to a 3.3 V-powered 74VHC244FT. Its output levels meet VOH ≥ 4.4 V and VOL ≤ 0.1 V at VCC = 5 V, ensuring reliable driving of 5 V loads while consuming only 80 µA max quiescent current across -40°C to +125°C.

Is the 74VHC244FT qualified for automotive applications?

Yes. The 74VHC244FT is fully qualified to AEC-Q100 Rev. H standards and rated for operation from -40°C to +125°C. Its design includes input overvoltage protection, power-down input safeguards, and guaranteed parametric performance across the full automotive temperature range - making it suitable for body control modules, infotainment interfaces, and other under-hood or cabin applications.

What is the maximum propagation delay of the 74VHC244FT across its full operating range?

The 74VHC244FT has a maximum propagation delay of 14.0 ns at VCC = 5.0 V, CL = 50 pF, and Ta = -40°C to +125°C. At 3.3 V operation, the max delay is 10.5 ns under identical load and temperature conditions. These values are specified in the AC Characteristics table (Section 11.6) and reflect worst-case timing for design margining in real-time systems.

What package type and footprint does the 74VHC244FT use?

The 74VHC244FT is packaged in TSSOP20B - a 20-pin thin shrink small outline package with 4.4 mm × 6.5 mm body size and 0.65 mm lead pitch. It is RoHS-compliant, lead-free, and compatible with standard reflow soldering profiles. The pinout matches industry-standard 74-series octal buffers, enabling direct PCB layout reuse for 74AC/74HC/74AHC244 footprints.