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

onsemi 74VHC244SJX

Name: 74VHC244SJX
Brand: onsemi
SKU: 74VHC244SJX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHC244SJX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: 74VHC244SJX.pdf

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

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Product details

Overview

74VHC244SJX 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 2.0 V to 5.5 V, delivers 3.9 ns typical propagation delay at 5 V, supports 0 V to 7 V input tolerance, and draws ≤4 µA quiescent current at 25 °C.

For engineers reviewing the 74VHC244SJX datasheet, pinout, applications, or equivalent options, key selection criteria include 3-STATE timing (tPZL/tPHZ), input voltage tolerance across mixed-supply systems, low-noise output (VOLP = 0.6 V typ), and compatibility with 74HC244 logic families in space-constrained SOP packages.

Technical Context

The 74VHC244SJX implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (OE1, OE2). Its silicon-gate CMOS process enables TTL-compatible speed with CMOS power efficiency, and its input protection circuit allows safe interfacing between 3 V and 5 V domains without level shifters.

All inputs tolerate 0 V to 7 V regardless of VCC, enabling robust operation in battery-backup or mismatched supply scenarios. The device features power-down input protection, low dynamic noise (VOLP/VOLV = 0.6 V typ), and guaranteed 3-STATE disable timing (tPHZ ≤ 10.5 ns at 5 V, CL = 50 pF).

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2.0 V to 5.5 V - Supports dual-voltage system interfacing and industrial 3.3 V/5 V designs.
tPLH / tPHL	3.9 ns (typ) at VCC = 5 V, CL = 15 pF - Enables high-speed bus buffering in memory and clock paths.
tPZH / tPHZ	4.7 ns / 6.7 ns (typ) at VCC = 5 V, CL = 15 pF - Ensures predictable 3-STATE enable/disable timing for bus arbitration.
Input Voltage Tolerance	0 V to 7 V - Permits direct connection to overvoltage-safe nodes or mixed-supply I/O without clamping diodes.
ICC (max)	4 µA at TA = 25 °C - Enables ultra-low static power in always-on or battery-backed control logic.
VOH / VOL	4.4 V / 0.36 V at IOH/IOL = 4 mA, VCC = 4.5 V - Delivers rail-to-rail CMOS-compatible drive strength.
CIN / COUT	10 pF / 6 pF - Minimizes capacitive loading on driving sources and downstream nets.

Pinout & Package

Pb-Free 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D). Pin pitch: 0.65 mm. Body width: 5.3 mm. Standard JEDEC-compliant footprint.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	OE1, OE2	Active-low 3-STATE enable inputs - Independently control first and second 4-bit buffer groups.
2–5, 11–14	I0–I3, I4–I7	Buffer inputs - Accept 0–7 V tolerant logic signals; no external pull-ups required.
6–9, 15–18	O0–O3, O4–O7	3-STATE outputs - High-impedance state (Z) when corresponding OE is HIGH; driven LOW/HIGH otherwise.
10, 20	GND, VCC	Power terminals - Decoupling capacitor placement near Pin 10 (GND) and Pin 20 (VCC) recommended for noise suppression.

Key Features

Feature	Design Value
High-speed CMOS architecture	3.9 ns propagation delay at 5 V - Matches bipolar TTL performance while reducing power by >90% vs. LS-TTL.
Input overvoltage tolerance	0 V to 7 V independent of VCC - Eliminates need for external clamping or level-shifting in mixed-supply systems.
Low dynamic output noise	VOLP = 0.6 V (typ), CL = 50 pF - Reduces ground bounce and signal integrity risk in dense PCB layouts.
Pin/function compatibility	Drop-in replacement for 74HC244 - Enables legacy design upgrades without layout changes or firmware updates.
Ultra-low ICC	≤4 µA max at 25 °C - Extends battery life in standby modes and reduces thermal load in sealed enclosures.

Applications

Memory Address Buffering	Microcontroller Bus Expansion
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash devices sharing a common data bus. IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer isolating address bus segments; OE1/OE2 synchronized with chip select signals. Use Value: Prevents bus contention during multi-device access; 3.9 ns delay ensures setup/hold timing margins at ≥25 MHz clock rates.	Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU to interface with parallel LCD, keypad matrix, and EEPROM. IC Role / Device Role / Timing Role: Bidirectional bus transceiver (configured unidirectionally); OE pins controlled via GPIO for per-peripheral enable. Use Value: Enables single MCU to manage multiple peripherals without FPGA or CPLD; 0–7 V input tolerance accommodates 3.3 V MCU + 5 V display logic.
Industrial PLC I/O Module	Digital Audio Clock Distribution
Use Scenario: Level-shifting and buffering digital I/O signals between 24 V field-side optocouplers and 3.3 V logic-side FPGA control. IC Role / Device Role / Timing Role: Input-tolerant buffer translating isolated logic levels; powered from 3.3 V rail while accepting 0–7 V inputs. Use Value: Removes need for discrete level translators; 4 µA ICC minimizes heat generation in thermally constrained DIN-rail enclosures.	Use Scenario: Distributing low-jitter master clock (e.g., 12.288 MHz) to multiple DACs and ADCs in a pro-audio mixer PCB. IC Role / Device Role / Timing Role: Low-skew clock driver (tOSHL ≤ 1.0 ns); outputs terminated to reduce reflections on parallel traces. Use Value: Maintains inter-device clock phase alignment; low VOLP suppresses jitter induced by simultaneous switching noise.

Memory Address Buffering

Microcontroller Bus Expansion

Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash devices sharing a common data bus.

IC Role / Device Role / Timing Role: Non-inverting 3-STATE buffer isolating address bus segments; OE1/OE2 synchronized with chip select signals.

Use Value: Prevents bus contention during multi-device access; 3.9 ns delay ensures setup/hold timing margins at ≥25 MHz clock rates.

Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU to interface with parallel LCD, keypad matrix, and EEPROM.

IC Role / Device Role / Timing Role: Bidirectional bus transceiver (configured unidirectionally); OE pins controlled via GPIO for per-peripheral enable.

Use Value: Enables single MCU to manage multiple peripherals without FPGA or CPLD; 0–7 V input tolerance accommodates 3.3 V MCU + 5 V display logic.

Industrial PLC I/O Module

Digital Audio Clock Distribution

Use Scenario: Level-shifting and buffering digital I/O signals between 24 V field-side optocouplers and 3.3 V logic-side FPGA control.

IC Role / Device Role / Timing Role: Input-tolerant buffer translating isolated logic levels; powered from 3.3 V rail while accepting 0–7 V inputs.

Use Value: Removes need for discrete level translators; 4 µA ICC minimizes heat generation in thermally constrained DIN-rail enclosures.

Use Scenario: Distributing low-jitter master clock (e.g., 12.288 MHz) to multiple DACs and ADCs in a pro-audio mixer PCB.

IC Role / Device Role / Timing Role: Low-skew clock driver (tOSHL ≤ 1.0 ns); outputs terminated to reduce reflections on parallel traces.

Use Value: Maintains inter-device clock phase alignment; low VOLP suppresses jitter induced by simultaneous switching noise.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74VHC244MTCX	TSSOP-20 package (4.4 mm width); 0.65 mm pitch; same electrical specs.	Better suited for high-density PCBs where board area is constrained; requires finer-pitch reflow profile.	Select when footprint miniaturization outweighs hand-soldering or test probe accessibility needs.
SN74LVC244APWR	Lower VCC range (1.65–3.6 V); higher drive (24 mA); not 0–7 V input tolerant.	Optimized for 3.3 V-only systems; unsuitable for 5 V mixed-supply interfaces or overvoltage-safe nodes.	Choose only for pure 3.3 V designs requiring higher sink/source current; verify input voltage limits match system rails.

Compared with 74VHC244SJX, the 74VHC244MTCX offers identical functionality in a smaller TSSOP package but demands tighter assembly tolerances, while the SN74LVC244APWR provides stronger drive in 3.3 V systems but sacrifices input overvoltage resilience and 5 V compatibility.

Availability

74VHC244SJX is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus expansion, and industrial I/O module designs requiring stable component supply, long-term lifecycle support, and Pb-free compliance.

Supply support for 74VHC244SJX 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, and cloud infrastructure markets.

The 74VHC244SJX belongs to ON Semiconductor's legacy VHC logic family-designed for high-speed, low-power, mixed-voltage digital interfacing in industrial control, computing, and communications equipment.

FAQ

What is the maximum input voltage rating for the 74VHC244SJX?

The 74VHC244SJX supports DC input voltages from 0 V to 7.0 V, independent of VCC. This allows safe interfacing with overvoltage nodes, battery-backup circuits, and mixed-supply systems without external clamping components. The specification is guaranteed per Absolute Maximum Ratings and confirmed in the DC Electrical Characteristics table under "DC Input Voltage (VIN)."

Is the 74VHC244SJX pin-compatible with the 74HC244?

Yes, the 74VHC244SJX is pin- and function-compatible with the 74HC244, including identical pinout, logic behavior, and 3-STATE control. This enables drop-in replacement in existing designs, delivering improved speed (3.9 ns vs. ~8 ns) and lower ICC (≤4 µA vs. ~20 µA) without PCB modifications.

What is the operating temperature range for the 74VHC244SJX?

The 74VHC244SJX is rated for operation from −40 °C to +85 °C ambient temperature. This industrial-grade range is specified in the Recommended Operating Conditions table and validated across all AC/DC electrical parameters, making it suitable for factory automation, outdoor networking, and transportation electronics.

Does the 74VHC244SJX require external pull-up resistors on its enable inputs?

No, the 74VHC244SJX does not require external pull-up resistors on OE1 or OE2. Its inputs include internal power-down protection and are fully compatible with standard CMOS logic levels. Unused enable inputs should be tied HIGH or LOW per datasheet guidance (Note 2), but floating connections are prohibited due to potential oscillation or increased ICC.

What package type does the 74VHC244SJX use, and is it RoHS-compliant?

The 74VHC244SJX uses a Pb-Free 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D). It complies with JEDEC J-STD-020B for moisture sensitivity and meets RoHS Directive 2011/65/EU requirements, as confirmed in the Ordering Code section and physical dimensions documentation.

74VHC244SJX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74VHC

Package/Case:: 20-SOIC (0.209", 5.30mm 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-SOP

74VHC244SJX FAQ

1.How can I place an order for 74VHC244SJX through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHC244SJX 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 74VHC244SJX reliable?

The price and inventory of 74VHC244SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC244SJX is usually 5 days.

3.What payment methods are accepted for 74VHC244SJX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC244SJX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHC244SJX?

74VHC244SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHC244SJX 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 74VHC244SJX?

For technical support, including 74VHC244SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC244SJX requirements.

6.How does Aetrix verify that 74VHC244SJX is sourced from the original manufacturer or authorized distributors?

All 74VHC244SJX 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 74VHC244SJX meets industry standards.

7.What is the process for return or replacement of 74VHC244SJX?

All 74VHC244SJX units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC244SJX, 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 74VHC244SJX part is unused and in its original packaging.

Return procedure for 74VHC244SJX:

1.Submit a request within 90 days.

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

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