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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

STMicroelectronics 74VHC244MTR

Name: 74VHC244MTR
Brand: STMicroelectronics
SKU: 74VHC244MTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHC244MTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: 74VHC244MTR.pdf

Description:: IC BUFFER NON-INVERT 5.5V 20SO

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VHC244MTR from STMicroelectronics is an octal non-inverting 3-state bus buffer IC used for bidirectional data routing and bus isolation in digital systems. It features 3.9 ns typical propagation delay at 5 V, 2 V to 5.5 V operating voltage, ±8 mA symmetrical output drive, 4 µA max ICC at 25 °C, and input tolerance up to 7 V independent of VCC - enabling robust 5 V ↔ 3 V level translation in memory address/data buses.

For engineers reviewing the 74VHC244MTR datasheet, 74VHC244MTR pinout, 74VHC244MTR application, or 74VHC244MTR equivalent, key selection criteria include 3-state timing (tPZL/tPLZ), noise immunity (28% VCC), latch-up immunity, power-down input protection, and SO-20 package compatibility with legacy 74-series layouts.

Technical Context

The device integrates two independent 4-bit buffer groups (1A/1Y and 2A/2Y), each controlled by its own active-low 3-state enable (1G, 2G). Its C2MOS process ensures rail-to-rail input tolerance and ESD immunity (2 kV HBM) without external clamping.

All inputs accept 0–7 V regardless of VCC, supporting hot-swap and mixed-voltage interfacing. Output skew is guaranteed ≤1.0 ns (5 V, 50 pF), and dynamic noise margins are specified via VOLP (≤0.9 V) and VIHD/VILD thresholds.

Key Specifications

Parameter	Value and Actual Design Meaning
tPD (Typ)	3.9 ns at VCC = 5 V - enables high-speed address/data buffering in 25 MHz+ bus systems
VCC Range	2.0–5.5 V - supports single-supply operation across 3.3 V and 5 V logic domains
IOH/IOL	±8 mA min - drives standard TTL loads and multiple CMOS inputs without fanout limitation
VNIH/VNIL	28% VCC min - provides noise margin >1.4 V at 5 V, critical for noisy industrial bus environments
ICC (Max)	4 µA at TA = 25 °C - enables ultra-low static power in battery-backed or standby modes
Input Voltage Range	−0.5 V to +7.0 V - allows safe interfacing with overvoltage sources and hot-plug operation
VOLP (Max)	0.9 V at CL = 50 pF - limits ground bounce during simultaneous switching output events

Pinout & Package

74VHC244MTR is supplied in a 20-pin SOIC (Small Outline Integrated Circuit) package, 7.6 mm wide, with 1.27 mm pitch, RoHS-compliant and JEDEC MS-013 compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1G / 2G	Active-low 3-state enable inputs controlling respective 4-bit buffer groups
2,4,6,8 / 11,13,15,17	1A1–1A4 / 2A1–2A4	Non-inverting data inputs for Group 1 and Group 2 buffers
3,5,7,9 / 12,14,16,18	1Y1–1Y4 / 2Y1–2Y4	Corresponding 3-state non-inverting outputs; high-impedance when G = HIGH
10	GND	Logic ground reference and primary return path for output current
20	VCC	Positive supply for internal logic and output drivers; decoupling required near pin

Key Features

Feature	Design Value
Power-down input protection	Inputs tolerate −0.5 V to +7.0 V regardless of VCC state - prevents damage during power sequencing or hot insertion
Symmetrical output drive	\|IOH\| = IOL ≥ 8 mA - eliminates asymmetry-induced timing skew in bidirectional bus control
Balanced propagation delays	tPLH ≈ tPHL - ensures consistent setup/hold timing margins for synchronous bus interfaces
ESD immunity	2 kV HBM on all pins - reduces need for external transient suppression in industrial PCB layouts

Applications

Memory Address Buffering

Microcontroller Bus Isolation

Use Scenario: Driving multiplexed address lines from a microcontroller to SRAM or EPROM in embedded systems with shared data/address buses.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing controlled signal launch and bus release with <6.5 ns max tPHL at 5 V.

Use Value: Enables clean bus turnaround by eliminating contention during read/write transitions; 28% VCC noise margin suppresses coupling from adjacent high-speed signals.

Use Scenario: Isolating peripheral I/O expansion buses (e.g., GPIO expanders, ADCs) from main MCU bus to prevent loading and timing violations.

IC Role / Device Role / Timing Role: Directionally agnostic bus driver with independent group enables (1G/2G) for selective peripheral activation.

Use Value: Reduces MCU I/O loading by >8× vs direct connection; ±8 mA drive sustains signal integrity across 10 cm PCB traces at 20 MHz.

5 V ↔ 3.3 V Level Translation

Industrial PLC Backplane Interface

Use Scenario: Interfacing legacy 5 V logic peripherals (e.g., UART transceivers, EEPROMs) with modern 3.3 V microcontrollers.

IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating logic levels without external resistors or level shifters.

Use Value: Input range (0–7 V) accepts 5 V signals while powered from 3.3 V VCC; VOLP ≤0.9 V prevents false triggering in noise-prone factory environments.

Use Scenario: Buffering distributed I/O scan data across modular PLC backplanes subject to EMI and ground shifts.

IC Role / Device Role / Timing Role: Robust bus repeater with latch-up immunity and 2 kV ESD rating for field-replaceable modules.

Use Value: Guaranteed operation from −40 °C to +85 °C; 4 µA quiescent current minimizes thermal drift in sealed enclosures.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC244APWR	Lower VCC range (1.65–3.6 V); 3.3 V only; 3.5 ns tPD typ; no 7 V input tolerance	Not suitable for 5 V systems or mixed-voltage hot-swap; optimized for low-voltage portable designs	Select only if system operates exclusively at 3.3 V and requires lower power than VHC series
74HC244D,653	Slower tPD (15 ns typ at 4.5 V); higher ICC (80 µA max); no 7 V input tolerance; same SO-20 footprint	Limited to lower-speed industrial controls where timing margin exceeds 10 ns	Use when cost sensitivity outweighs speed/power requirements and 5 V-only operation is confirmed

Compared with SN74LVC244APWR and 74HC244D,653, the 74VHC244MTR uniquely supports dual-voltage domain interoperability, sub-4 ns timing at 5 V, and fault-tolerant input operation - making it the only choice for legacy-compatible, mixed-supply, and high-noise industrial bus nodes.

Availability

74VHC244MTR is available at Aetrix Electronics and suitable for memory subsystems, microcontroller peripheral expansion, industrial PLC backplanes, and 5 V/3.3 V interface circuits requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74VHC244MTR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal design heritage.

The 74VHC series targets high-speed, low-power, and robust logic interfacing - designed specifically for industrial control, instrumentation, and legacy-system upgrades where reliability under voltage stress and noise is non-negotiable.

FAQ

Can 74VHC244MTR operate with VCC = 3.3 V while accepting 5 V inputs?

Yes. The device guarantees safe operation with inputs up to 7 V regardless of VCC value, including 3.3 V supply. This enables true 5 V → 3.3 V level translation without external components, validated per absolute maximum ratings and recommended operating conditions in the ST datasheet.

What is the maximum clock/data rate supported by 74VHC244MTR?

While not a clocked device, its 3.9 ns typical propagation delay at 5 V supports reliable data throughput up to ~25 MHz in bus applications. Skew ≤1.0 ns and balanced tPLH/tPHL ensure setup/hold compliance for synchronous interfaces running at this frequency with proper layout.

Does 74VHC244MTR require external pull-up or pull-down resistors on 3-state outputs?

No. When disabled (G = HIGH), outputs enter high-impedance state with leakage ≤±0.25 µA at 5.5 V. External resistors are unnecessary unless system-level bus termination or weak biasing is required for specific protocol compliance (e.g., open-drain emulation).

Is the SO-20 package of 74VHC244MTR pin-compatible with older 74LS244 devices?

Yes. Pin numbering, function mapping (1G, 1A1–1A4, 1Y1–1Y4, etc.), and mechanical dimensions match JEDEC MS-013, ensuring drop-in replacement for 74LS244, 74HC244, and 74ACT244 in existing SO-20 footprints - though electrical behavior (speed, drive, voltage range) differs significantly.

74VHC244MTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VHC

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 8mA, 8mA

Voltage - Supply:: 2V ~ 5.5V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

74VHC244MTR FAQ

1.How can I place an order for 74VHC244MTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHC244MTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 74VHC244MTR reliable?

The price and inventory of 74VHC244MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC244MTR is usually 5 days.

3.What payment methods are accepted for 74VHC244MTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC244MTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHC244MTR?

74VHC244MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHC244MTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 74VHC244MTR?

For technical support, including 74VHC244MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC244MTR requirements.

6.How does Aetrix verify that 74VHC244MTR is sourced from the original manufacturer or authorized distributors?

All 74VHC244MTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 74VHC244MTR meets industry standards.

7.What is the process for return or replacement of 74VHC244MTR?

All 74VHC244MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC244MTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 74VHC244MTR part is unused and in its original packaging.

Return procedure for 74VHC244MTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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