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

onsemi 74VHC244M

Name: 74VHC244M
Brand: onsemi
SKU: 74VHC244M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHC244M

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74VHC244M.pdf

Description:: IC BUF NON-INVERT 5.5V 20SOIC

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Product details

Overview

74VHC244M from ON Semiconductor is an advanced high-speed CMOS octal non-inverting buffer/line driver with dual active-LOW 3-STATE outputs, designed for memory address driving, clock distribution, and bus-oriented transmitter/receiver applications. It operates from 2.0V to 5.5V, delivers 3.9ns typical propagation delay at 5V, supports 0V–7V input tolerance, and draws ≤4 µA quiescent current at 25°C.

For engineers reviewing the 74VHC244M datasheet, pinout, applications, or equivalent options, key selection considerations include its dual independent output-enable control (OE1/OE2), 3-STATE bus isolation capability, 5.5V absolute max input voltage rating, and compatibility with mixed-voltage 3V/5V system interfacing.

Technical Context

The 74VHC244M implements eight independent non-inverting buffer channels grouped into two banks of four (I0–I3/O0–O3 controlled by OE1; I4–I7/O4–O7 controlled by OE2), each with rail-to-rail input tolerance up to 7V regardless of VCC. Its silicon gate CMOS process enables TTL-compatible speed with CMOS power efficiency.

It features built-in power-down protection on all inputs, low dynamic noise (VOLP = 0.6V typ), and guaranteed 3-STATE off-state leakage (IOZ ≤ ±2.5 µA). The device meets JEDEC MS-013 SOIC-20 mechanical standards and supports Pb-free reflow per J-STD-020B.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.0V to 5.5V - Enables operation in both 3.3V and 5V logic systems without level shifters.
Propagation Delay (tPD)	3.9ns (typ) at VCC = 5V, CL = 15pF - Supports high-speed bus timing in memory and peripheral interfaces.
Input Voltage Range	0V to 7.0V - Allows safe interfacing between 5V and 3V domains or battery-backed systems with mismatched supplies.
Quiescent Supply Current (ICC)	≤4 µA max at TA = 25°C - Ensures ultra-low static power in battery-sensitive or always-on subsystems.
3-STATE Enable/Disable Time	tPZH = 4.7ns (typ), tPHZ = 6.7ns (typ) at 5V - Provides fast bus turnaround for bidirectional data arbitration.
Output Drive Capability	±25mA DC output current - Sufficient to drive multiple CMOS/TTL loads or moderate PCB trace capacitance.
Operating Temperature	−40°C to +85°C - Qualified for industrial-grade embedded and automotive under-hood auxiliary circuits.

Pinout & Package

74VHC244M is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package, JEDEC MS-013 compliant, 0.300" wide, with standard gull-wing lead form and Pb-free finish per J-STD-020B.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-LOW enable inputs controlling first and second group of four outputs respectively; independent control enables partial bus gating.
2–5, 11–14	I0–I3, I4–I7	Non-inverting digital inputs - tolerant to 0V–7V regardless of VCC, enabling robust mixed-supply interface.
6–9, 15–18	O0–O3, O4–O7	3-STATE buffered outputs - present high-impedance state when respective OE is HIGH, isolating bus segments.
10, 20	GND, VCC	Power supply terminals - decoupling capacitor placement near Pin 10 (GND) and Pin 20 (VCC) minimizes switching noise.

Key Features

Feature	Design Value
High-speed CMOS architecture	3.9ns typical propagation delay at 5V matches bipolar TTL performance while consuming <4 µA static current.
Rail-to-rail input voltage tolerance	0V to 7.0V input range allows direct connection to overvoltage sources or 5V signals in 3.3V systems without external clamping.
Dual independent 3-STATE enables	OE1 and OE2 provide granular control over two separate 4-bit data groups, supporting segmented bus arbitration and power-gated subsystems.
Low dynamic output noise	VOLP = 0.6V typical ensures minimal ground bounce during simultaneous switching, critical for signal integrity in dense PCB layouts.
Pin- and function-compatible with 74HC244	Drop-in replacement for legacy HC-family designs without layout changes, preserving existing schematics and BOMs.

Applications

Memory Address Buffering	Microcontroller Bus Interface
Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or flash memory in an industrial PLC. IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer providing fanout gain and bus isolation during memory read/write cycles. Use Value: Dual OE control allows selective deactivation of upper/lower address byte groups, reducing capacitive loading and improving timing margin.	Use Scenario: Interfacing an 8-bit MCU GPIO port to a parallel LCD module requiring 8-bit data + control signals. IC Role / Device Role / Timing Role: Octal line driver translating MCU logic levels to display logic while enabling/disabling data bursts via OE. Use Value: 7V-tolerant inputs accept LCD reset or backlight control signals that may exceed VCC, eliminating external level-shifting components.
Industrial I/O Expansion	Legacy System Signal Conditioning
Use Scenario: Expanding digital I/O count in a programmable logic controller using discrete sensors and actuators. IC Role / Device Role / Timing Role: Bidirectional bus driver buffering sensor status bits to CPU and actuator command bits from CPU. Use Value: Low ICC and −40°C to +85°C rating support long-term reliability in unventilated control cabinets with thermal cycling.	Use Scenario: Replacing obsolete 74LS244 in a legacy test equipment backplane where 5V TTL signals must drive modern CMOS peripherals. IC Role / Device Role / Timing Role: Logic-level translator and fanout amplifier maintaining signal integrity across aging interconnects. Use Value: Identical pinout and AC characteristics to 74HC244 allow direct substitution, while 7V input tolerance accommodates marginal signal overshoot in aged systems.

Memory Address Buffering

Microcontroller Bus Interface

Use Scenario: Driving 16-bit address lines from a microcontroller to SRAM or flash memory in an industrial PLC.

IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer providing fanout gain and bus isolation during memory read/write cycles.

Use Value: Dual OE control allows selective deactivation of upper/lower address byte groups, reducing capacitive loading and improving timing margin.

Use Scenario: Interfacing an 8-bit MCU GPIO port to a parallel LCD module requiring 8-bit data + control signals.

IC Role / Device Role / Timing Role: Octal line driver translating MCU logic levels to display logic while enabling/disabling data bursts via OE.

Use Value: 7V-tolerant inputs accept LCD reset or backlight control signals that may exceed VCC, eliminating external level-shifting components.

Industrial I/O Expansion

Legacy System Signal Conditioning

Use Scenario: Expanding digital I/O count in a programmable logic controller using discrete sensors and actuators.

IC Role / Device Role / Timing Role: Bidirectional bus driver buffering sensor status bits to CPU and actuator command bits from CPU.

Use Value: Low ICC and −40°C to +85°C rating support long-term reliability in unventilated control cabinets with thermal cycling.

Use Scenario: Replacing obsolete 74LS244 in a legacy test equipment backplane where 5V TTL signals must drive modern CMOS peripherals.

IC Role / Device Role / Timing Role: Logic-level translator and fanout amplifier maintaining signal integrity across aging interconnects.

Use Value: Identical pinout and AC characteristics to 74HC244 allow direct substitution, while 7V input tolerance accommodates marginal signal overshoot in aged systems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer/line driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74HC244PW,118 (Nexperia)	Same pinout and logic function; slightly higher ICC (≤20 µA) and slower tPD (6.5ns typ at 5V).	Valid for cost-sensitive consumer designs where 3.9ns timing is not required.	Select when lower unit cost outweighs need for sub-4ns propagation delay.
SN74LVC244APWR (Texas Instruments)	3.3V-only supply range (1.65V–3.6V); 3.5ns tPD; 5V-tolerant inputs but not 7V-tolerant.	Suitable only for pure 3.3V systems; cannot replace 74VHC244M in mixed 5V/3V or overvoltage scenarios.	Choose only if design is fully 3.3V and requires tighter VCC regulation than VHC's 2.0–5.5V range permits.

Compared with 74HC244PW,118 and SN74LVC244APWR, the 74VHC244M uniquely combines 2.0–5.5V operation, 7V input tolerance, and 3.9ns speed-making it the sole option for robust 5V-system upgrades requiring backward compatibility and overvoltage resilience.

Availability

74VHC244M is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus interfacing, and industrial I/O expansion requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for 74VHC244M 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, cloud computing, and IoT applications.

The 74VHC244M belongs to ON Semiconductor's legacy logic portfolio inherited from Fairchild, engineered for high-speed, low-power, mixed-voltage digital interfacing in industrial control, instrumentation, and legacy system modernization.

FAQ

What is the maximum input voltage rating for the 74VHC244M?

The 74VHC244M supports an absolute maximum DC input voltage of 0V to 7.0V, independent of VCC. This allows safe interfacing with 5V signals in 3.3V systems or connections to battery-backed rails without external clamping diodes. This specification is verified in the Absolute Maximum Ratings table of the Fairchild DS011522 datasheet.

Is the 74VHC244M pin-compatible with the 74HC244?

Yes, the 74VHC244M is explicitly stated in its datasheet to be pin and function compatible with the 74HC244. Both devices share identical SOIC-20 pinouts, truth tables, and logic behavior, enabling drop-in replacement in existing designs without PCB modification or firmware changes.

What is the typical propagation delay of the 74VHC244M at 3.3V operation?

At VCC = 3.3V ±0.3V and CL = 15pF, the 74VHC244M exhibits a typical propagation delay (tPLH/tPHL) of 5.8ns and 8.3ns respectively. These values are specified in the AC Electrical Characteristics table of the official datasheet and reflect real-world timing under standard load conditions.

Does the 74VHC244M support 3-STATE output disable timing critical for bus arbitration?

Yes, the 74VHC244M provides guaranteed 3-STATE enable time (tPZH = 4.7ns typ at 5V) and disable time (tPHZ = 6.7ns typ at 5V), ensuring rapid bus release and acquisition. These parameters are essential for reliable multi-master bus protocols and are measured under RL = 1kΩ and CL = 50pF conditions per datasheet.

What package type does the 74VHC244M use, and is it RoHS-compliant?

The 74VHC244M uses a 20-lead SOIC package (JEDEC MS-013, 0.300" wide, package number M20B) with Pb-free terminations compliant with JEDEC J-STD-020B reflow standards. This package is RoHS-compliant and suitable for automated surface-mount assembly processes.

74VHC244M Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VHC

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

Packaging:: Tube

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-SOIC

74VHC244M FAQ

1.How can I place an order for 74VHC244M through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHC244M 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 74VHC244M reliable?

The price and inventory of 74VHC244M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC244M is usually 5 days.

3.What payment methods are accepted for 74VHC244M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC244M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHC244M?

74VHC244M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHC244M 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 74VHC244M?

For technical support, including 74VHC244M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC244M requirements.

6.How does Aetrix verify that 74VHC244M is sourced from the original manufacturer or authorized distributors?

All 74VHC244M 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 74VHC244M meets industry standards.

7.What is the process for return or replacement of 74VHC244M?

All 74VHC244M units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC244M, 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 74VHC244M part is unused and in its original packaging.

Return procedure for 74VHC244M:

1.Submit a request within 90 days.

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

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