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

onsemi MM74HC244SJX

Name: MM74HC244SJX
Brand: onsemi
SKU: MM74HC244SJX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MM74HC244SJX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: MM74HC244SJX.pdf

Description:: IC BUFFER NON-INVERT 6V 20SOP

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Product details

Overview

MM74HC244SJX from ON Semiconductor is an octal non-inverting 3-STATE buffer with two independent active-low enables (1G, 2G), each controlling four buffers. It operates across 2–6 V supply, delivers ±6 mA output drive, exhibits 14 ns typical propagation delay at 4.5 V, and features high noise immunity and low quiescent current (80 µA). It is used in bidirectional bus interfacing for microcontroller peripheral expansion.

For engineers reviewing the MM74HC244SJX datasheet, pinout, applications, or equivalent options, key selection criteria include 20-pin SOP package compatibility, 3-STATE bus contention control, CMOS-level input thresholds, and guaranteed 4.5 V/25 °C AC timing performance under 50 pF load.

Technical Context

The MM74HC244SJX implements eight independent non-inverting buffer channels grouped into two quartets, each controlled by a dedicated active-low enable (1G, 2G). No Schmitt-trigger inputs are included, and all inputs feature diode-based ESD protection to V_CC and GND.

It uses silicon-gate CMOS technology to achieve LS-TTL-compatible speed (fanout = 15) while maintaining low static power consumption and wide V_CC tolerance. Output disable timing (t_PHZ/t_PLZ) is specified down to 13 ns at 6.0 V, supporting high-speed bus arbitration in mixed-voltage systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.0 V to 6.0 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters.
Propagation Delay (t_PLH/t_PHL)	14 ns typical at V_CC = 4.5 V, CL = 50 pF - enables reliable operation on 30+ MHz address/data buses.
Output Drive Current	±6 mA at V_CC = 4.5 V - sufficient to drive 15 LS-TTL loads or 50 pF bus capacitance with margin.
Quiescent Supply Current	80 µA max at V_CC = 6.0 V - ensures minimal standby power in battery-backed or low-power embedded systems.
Input Thresholds (V_IH/V_IL)	V_IH = 3.15 V, V_IL = 1.35 V at V_CC = 4.5 V - provides >1.1 V noise margin against TTL and CMOS logic families.
3-STATE Leakage (I_OZ)	±5 µA max at V_CC = 6.0 V - prevents signal corruption during bus contention or hot-swap scenarios.

Pinout & Package

MM74HC244SJX is housed in a 20-lead Small Outline Package (SOP), EIAJ TYPE II, 5.3 mm wide (Package Number M20D), with gull-wing leads and standard JEDEC footprint.

Pin/Terminal	Circuit Role	Design Meaning
1G	Active-low enable for Y1–Y4	Drives outputs Y1–Y4 into high-impedance when HIGH; enables buffering when LOW.
2G	Active-low enable for Y5–Y8	Independent control of second buffer group; allows partial bus gating without global reset.
1A1–1A4	Inputs for first buffer group	Non-inverting inputs tied to system address/data lines; no polarity inversion applied.
2A1–2A4	Inputs for second buffer group	Separate input set enables dual-bus or multiplexed I/O routing in compact layouts.
1Y1–1Y4	Outputs for first buffer group	3-STATE outputs with rail-to-rail swing; compatible with TTL, CMOS, and LVTTL loads.
2Y1–2Y8	Outputs for second buffer group	Electrically isolated from first group; supports independent direction control in bidirectional interfaces.
V_CC	Positive supply	Single-supply operation only; no separate logic or I/O voltage rails required.
GND	Ground reference	Common return for all inputs, outputs, and internal circuitry; must be low-impedance.

Key Features

Feature	Design Value
Octal non-inverting buffering	Enables parallel data path expansion without signal inversion, simplifying PCB routing and firmware logic.
Dual independent 3-STATE enables	Allows selective activation of two 4-bit segments-ideal for memory-mapped I/O or segmented bus arbitration.
CMOS input thresholds	Guaranteed V_IH/V_IL over full V_CC range eliminates need for external pull-ups or threshold-setting resistors.
Low dynamic power (CPD = 12 pF)	Reduces switching current and heat generation in high-frequency bus applications, improving thermal margin.
ESD-protected inputs	Diode-clamped inputs withstand ±2 kV HBM per MIL-STD-883, reducing susceptibility to handling damage.

Applications

Microcontroller I/O Expansion	Memory Address/Data Bus Buffering
Use Scenario: Expanding GPIO count on an ARM Cortex-M0 MCU with limited native pins for sensor array control. IC Role / Device Role / Timing Role: Non-inverting buffer providing drive strength and isolation between MCU port and 8-channel analog mux control lines. Use Value: Enables direct connection of 8 digital control signals without level-shifting or additional drivers, preserving timing integrity up to 20 MHz.	Use Scenario: Isolating and driving 8-bit data lines between an 8051 microcontroller and external SRAM. IC Role / Device Role / Timing Role: Bidirectional 3-STATE buffer managing data flow direction via separate enable controls synchronized to WR/RD strobes. Use Value: Prevents bus contention during read/write transitions and maintains signal integrity across 10 cm PCB traces at 12 MHz.
Industrial PLC Digital Input Conditioning	Legacy Peripheral Interface Adapter
Use Scenario: Interfacing 24 V industrial sensors to a 3.3 V FPGA-based controller via optocoupler-isolated inputs. IC Role / Device Role / Timing Role: Level-translating buffer converting cleaned 3.3 V logic levels to drive FPGA I/O banks with precise setup/hold timing. Use Value: Eliminates need for discrete MOSFET translators; guarantees t_PLH ≤ 23 ns at 3.3 V, meeting FPGA input timing budgets.	Use Scenario: Adapting ISA bus signals (5 V TTL) to modern low-voltage peripherals in retro-computing hardware projects. IC Role / Device Role / Timing Role: Voltage-tolerant buffer enabling safe 5 V signal injection into 3.3 V subsystems using 3-STATE isolation. Use Value: Supports hot-plug compatibility and avoids latch-up risk due to CMOS input structure and 6 V absolute max rating.

Microcontroller I/O Expansion

Memory Address/Data Bus Buffering

Use Scenario: Expanding GPIO count on an ARM Cortex-M0 MCU with limited native pins for sensor array control.

IC Role / Device Role / Timing Role: Non-inverting buffer providing drive strength and isolation between MCU port and 8-channel analog mux control lines.

Use Value: Enables direct connection of 8 digital control signals without level-shifting or additional drivers, preserving timing integrity up to 20 MHz.

Use Scenario: Isolating and driving 8-bit data lines between an 8051 microcontroller and external SRAM.

IC Role / Device Role / Timing Role: Bidirectional 3-STATE buffer managing data flow direction via separate enable controls synchronized to WR/RD strobes.

Use Value: Prevents bus contention during read/write transitions and maintains signal integrity across 10 cm PCB traces at 12 MHz.

Industrial PLC Digital Input Conditioning

Legacy Peripheral Interface Adapter

Use Scenario: Interfacing 24 V industrial sensors to a 3.3 V FPGA-based controller via optocoupler-isolated inputs.

IC Role / Device Role / Timing Role: Level-translating buffer converting cleaned 3.3 V logic levels to drive FPGA I/O banks with precise setup/hold timing.

Use Value: Eliminates need for discrete MOSFET translators; guarantees t_PLH ≤ 23 ns at 3.3 V, meeting FPGA input timing budgets.

Use Scenario: Adapting ISA bus signals (5 V TTL) to modern low-voltage peripherals in retro-computing hardware projects.

IC Role / Device Role / Timing Role: Voltage-tolerant buffer enabling safe 5 V signal injection into 3.3 V subsystems using 3-STATE isolation.

Use Value: Supports hot-plug compatibility and avoids latch-up risk due to CMOS input structure and 6 V absolute max rating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC244N	Same logic function and pinout; PDIP package (N20A), higher thermal resistance, no lead-free option in legacy Fairchild version.	Preferred for through-hole prototyping or legacy repair; not suitable for automated SMT assembly.	Select SN74HC244N only if manual soldering or socket-based testing is required.
MC74HC244ADTR2G	Identical functionality; TSSOP-20 (MTC20) package, 4.4 mm width, tighter pitch (0.65 mm), RoHS-compliant per ON Semi revision.	Better suited for space-constrained boards; requires reflow profile adjustment for finer pitch.	Choose MC74HC244ADTR2G when board area is constrained and automated SMT capability exists.

Compared with SN74HC244N and MC74HC244ADTR2G, the MM74HC244SJX offers optimal balance of SOP manufacturability, thermal performance, and legacy design continuity-making it ideal for mid-volume industrial control PCBs where 5.3 mm width and 1.27 mm pitch simplify stencil design and inspection.

Availability

MM74HC244SJX is available at Aetrix Electronics and suitable for microcontroller I/O expansion, memory bus buffering, and industrial digital input conditioning requiring stable component supply and long-term production support.

Supply support for MM74HC244SJX 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 MM74HC244SJX belongs to ON Semiconductor's legacy HC logic family, designed for robust, low-power, high-speed digital interfacing in cost-sensitive industrial and embedded systems where reliability and broad voltage operation are critical.

FAQ

What is the maximum operating temperature range for the MM74HC244SJX?

The MM74HC244SJX is rated for operation from −40 °C to +85 °C ambient temperature. This range is validated across all electrical parameters including propagation delay, output drive, and 3-STATE leakage. The MM74HC244SJX maintains full functionality within this envelope without derating, making it suitable for industrial environments such as factory automation controllers and outdoor telemetry units.

Does the MM74HC244SJX support 3.3 V logic systems?

Yes, the MM74HC244SJX fully supports 3.3 V operation: V_CC can be set between 2.0 V and 6.0 V, and input thresholds (V_IH = 2.0 V min, V_IL = 0.5 V max at V_CC = 3.3 V) ensure clean recognition of 3.3 V logic levels. Its 6 mA output drive sustains valid VOH/VOL margins into standard CMOS loads at 3.3 V, confirming interoperability with 3.3 V microcontrollers and FPGAs.

Is the MM74HC244SJX pin-compatible with the SN74HC244?

No, the MM74HC244SJX is not pin-compatible with the TI SN74HC244. While both are octal 3-STATE buffers with identical logic function and pin count, the MM74HC244SJX follows Fairchild's original pinout (e.g., 1G on Pin 1, 1A1 on Pin 2), whereas SN74HC244 places 1A1 on Pin 1 and 1G on Pin 19. Physical layout substitution requires PCB redesign; functional replacement demands verification of enable polarity and signal routing.

What is the meaning of the "X" suffix in MM74HC244SJX?

The "X" suffix in MM74HC244SJX indicates tape-and-reel packaging per EIA-481 standard, intended for automated SMT placement. The base part MM74HC244SJ is supplied in tube format. Both share identical die, electrical specs, and package dimensions (M20D SOP); only packaging differs. Aetrix Electronics stocks MM74HC244SJX specifically for high-volume production lines requiring reel-fed feeders.

Can the MM74HC244SJX drive a 150 pF bus capacitance reliably?

Yes-the MM74HC244SJX specifies t_PLH/t_PHL = 17 ns max at V_CC = 4.5 V and CL = 150 pF, confirming reliable timing margin for heavy capacitive loads. Its ±6 mA output drive ensures adequate slew rate, and measured t_TLH/t_THL remains ≤18 ns under same conditions. For sustained 150 pF loading, maintain V_CC ≥ 4.5 V and minimize trace inductance to avoid ringing.

MM74HC244SJX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74HC

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:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOP

MM74HC244SJX FAQ

1.How can I place an order for MM74HC244SJX through Aetrix?

Please submit a Request for Quotation (RFQ) for MM74HC244SJX 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 MM74HC244SJX reliable?

The price and inventory of MM74HC244SJX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HC244SJX is usually 5 days.

3.What payment methods are accepted for MM74HC244SJX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HC244SJX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM74HC244SJX?

MM74HC244SJX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM74HC244SJX 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 MM74HC244SJX?

For technical support, including MM74HC244SJX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HC244SJX requirements.

6.How does Aetrix verify that MM74HC244SJX is sourced from the original manufacturer or authorized distributors?

All MM74HC244SJX 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 MM74HC244SJX meets industry standards.

7.What is the process for return or replacement of MM74HC244SJX?

All MM74HC244SJX units undergo pre-shipment inspection (PSI). If there is an issue with MM74HC244SJX, 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 MM74HC244SJX part is unused and in its original packaging.

Return procedure for MM74HC244SJX:

1.Submit a request within 90 days.

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

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