Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi MM74HCT240WMX

Name: MM74HCT240WMX
Brand: onsemi
SKU: MM74HCT240WMX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: MM74HCT240WMX

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: MM74HCT240WMX.pdf

Description:: IC BUFFER INVERT 5.5V 20SOIC

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:1,038

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

MM74HCT240WMX from onsemi is an inverting octal 3-STATE buffer IC designed for high-speed bus interface applications. It features dual active-low enables (1G, 2G), TTL-compatible inputs, 14 ns typical propagation delay at 5 V, ±6 mA output drive, and operates across −55 °C to +125 °C. It is used in industrial control backplanes and legacy TTL-to-CMOS level translation.

For engineers reviewing the MM74HCT240WMX datasheet, pinout, applications, or equivalent options, key selection criteria include inverting logic behavior, SOIC-20 WB package compatibility, guaranteed 3-STATE disable timing (≤38 ns), and LS-TTL fanout support (15 loads) in extended temperature environments.

Technical Context

The MM74HCT240WMX implements two independent 4-bit inverting buffers, each controlled by its own active-low enable (1G/2G). Its CMOS silicon-gate architecture delivers LS-TTL speed with CMOS power efficiency, achieving 14 ns propagation delay while drawing only 160 µA quiescent current.

All inputs include diode-based ESD protection to V_CC and GND. The device meets absolute maximum ratings up to 6.5 V supply and −65 °C to +150 °C storage, with DC output current capability of ±35 mA per pin and 3-STATE leakage ≤±10 µA over full temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Inverting octal buffer with dual active-low enables (1G, 2G)
Propagation Delay (t_PHL/t_PLH)	25 ns max at V_CC = 4.5–5.5 V, T_A = −55 °C to +125 °C, C_L = 50 pF
Output Drive Current	−6 mA (high sink), +6 mA (low source) min at V_CC = 4.5 V
Quiescent Supply Current (I_CC)	160 µA max over full operating temperature range
Input Voltage Thresholds	V_IL ≤ 0.8 V (max), V_IH ≥ 2.0 V (min) - ensures robust TTL-level recognition
3-STATE Disable Time (t_PLZ/t_PHZ)	38 ns max at V_CC = 4.5–5.5 V, T_A = −55 °C to +125 °C, R_L = 1 kΩ, C_L = 50 pF
Operating Temperature Range	−55 °C to +125 °C - qualified for harsh industrial and automotive under-hood environments

Pinout & Package

MM74HCT240WMX is housed in a Pb-free SOIC-20 wide-body (case 751D−05) package measuring 12.8 mm × 7.5 mm × 2.5 mm, with 1.27 mm pitch and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
1G, 2G	Active-low enable inputs	Each controls four inverting buffers; asserted low enables corresponding Y outputs
1A1–1A4, 2A1–2A4	Input terminals	Eight buffered TTL-compatible inputs; inverted at respective Y outputs
1Y1–1Y4, 2Y1–2Y4	3-STATE output terminals	Eight inverting outputs; high-impedance when associated G is high
V_CC, GND	Power supply pins	V_CC = Pin 20, GND = Pin 10 - decoupling required within 10 mm for noise immunity

Key Features

Feature	Design Value
TTL input compatibility	Guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V - eliminates need for level-shifting in mixed-logic systems
High-speed 3-STATE operation	Enable/disable times ≤ 45 ns - supports clean bus arbitration in multiplexed data paths
Low-power CMOS core	160 µA I_CC max - reduces system standby power vs. LS-TTL equivalents
Robust ESD protection	Diode-clamped inputs to V_CC and GND - withstands ≥2 kV HBM per JEDEC JESD22-A114
Extended temperature qualification	−55 °C to +125 °C operation - validated for industrial automation and engine-control modules

Applications

Industrial Backplane Interface	Legacy System Bus Translation
Use Scenario: Bidirectional data routing between microcontroller peripherals and legacy ISA-style expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting 3-STATE buffer isolating address/data lines during bus contention; enables/disables per segment via 1G/2G. Use Value: 14 ns propagation delay and 6 mA drive ensure reliable signal integrity across 15 cm PCB traces loaded with 45 pF capacitance.	Use Scenario: Interfacing 5 V CMOS microcontrollers to older TTL-based instrumentation subsystems requiring strict voltage threshold compliance. IC Role / Device Role / Timing Role: Level translator and bus driver with TTL-compatible inputs and CMOS-compatible outputs; provides fanout of 15 LS-TTL loads. Use Value: Guaranteed V_IH/V_IL thresholds and −55 °C to +125 °C operation allow drop-in replacement without redesign in field-deployed test equipment.
Automotive Engine Control Module	Programmable Logic I/O Expansion
Use Scenario: Signal conditioning for sensor data acquisition in engine management units exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Isolating analog-to-digital converter control lines from noisy microcontroller buses using 3-STATE gating. Use Value: 38 ns max disable time prevents bus glitches during rapid enable/disable transitions in real-time control loops.	Use Scenario: Expanding FPGA I/O count for parallel communication with external memory or peripheral ASICs in embedded vision systems. IC Role / Device Role / Timing Role: Octal inverting buffer providing direction-controlled data latching and bus isolation between FPGA and external SRAM. Use Value: Dual independent enables (1G/2G) allow simultaneous control of two 4-bit data lanes, reducing FPGA pin usage by 50% vs. discrete buffers.

Industrial Backplane Interface

Legacy System Bus Translation

Use Scenario: Bidirectional data routing between microcontroller peripherals and legacy ISA-style expansion slots in programmable logic controllers.

IC Role / Device Role / Timing Role: Inverting 3-STATE buffer isolating address/data lines during bus contention; enables/disables per segment via 1G/2G.

Use Value: 14 ns propagation delay and 6 mA drive ensure reliable signal integrity across 15 cm PCB traces loaded with 45 pF capacitance.

Use Scenario: Interfacing 5 V CMOS microcontrollers to older TTL-based instrumentation subsystems requiring strict voltage threshold compliance.

IC Role / Device Role / Timing Role: Level translator and bus driver with TTL-compatible inputs and CMOS-compatible outputs; provides fanout of 15 LS-TTL loads.

Use Value: Guaranteed V_IH/V_IL thresholds and −55 °C to +125 °C operation allow drop-in replacement without redesign in field-deployed test equipment.

Automotive Engine Control Module

Programmable Logic I/O Expansion

Use Scenario: Signal conditioning for sensor data acquisition in engine management units exposed to under-hood thermal cycling.

IC Role / Device Role / Timing Role: Isolating analog-to-digital converter control lines from noisy microcontroller buses using 3-STATE gating.

Use Value: 38 ns max disable time prevents bus glitches during rapid enable/disable transitions in real-time control loops.

Use Scenario: Expanding FPGA I/O count for parallel communication with external memory or peripheral ASICs in embedded vision systems.

IC Role / Device Role / Timing Role: Octal inverting buffer providing direction-controlled data latching and bus isolation between FPGA and external SRAM.

Use Value: Dual independent enables (1G/2G) allow simultaneous control of two 4-bit data lanes, reducing FPGA pin usage by 50% vs. discrete buffers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT240N	Same logic function and SOIC-20 package; 20 ns max t_PHL/t_PLH at 25 °C only; not rated beyond +85 °C	Limited to commercial temperature range (0 °C to +70 °C); unsuitable for extended industrial use	Select SN74HCT240N only for cost-sensitive consumer-grade designs where −55 °C to +125 °C operation is unnecessary
74ACT240SCX	Higher drive (±24 mA), faster (9 ns typ), but requires 5 V ±10% only; no −55 °C rating; different input thresholds (V_IH = 3.5 V min)	Not TTL-input compatible; incompatible with legacy 0.8 V/2.0 V threshold systems	Choose 74ACT240SCX only when driving heavy capacitive loads (>100 pF) and full TTL compatibility is not required

Compared with SN74HCT240N and 74ACT240SCX, MM74HCT240WMX uniquely combines guaranteed −55 °C to +125 °C operation, true TTL input thresholds, and 3-STATE timing consistency across temperature - making it the sole option for ruggedized bus interface in automotive and industrial control.

Availability

MM74HCT240WMX is available at Aetrix Electronics and suitable for industrial backplane interfaces, automotive engine control modules, and legacy system bus translation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MM74HCT240WMX 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

onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MM74HCT240WMX belongs to onsemi's legacy HCT logic family, engineered specifically for seamless TTL-to-CMOS interfacing in mission-critical industrial and automotive systems requiring extended temperature reliability.

FAQ

What logic function does the MM74HCT240WMX implement?

The MM74HCT240WMX implements two independent groups of four inverting 3-STATE buffers. Each group has its own active-low enable (1G or 2G): when asserted, the corresponding four A inputs are inverted and driven onto the Y outputs; when deasserted, those Y outputs enter high-impedance state. This allows precise bus segmentation and contention control in multi-master systems.

Is the MM74HCT240WMX pin-compatible with the MM74HCT244WMX?

No, the MM74HCT240WMX is not pin-compatible with the MM74HCT244WMX. Although both are octal 3-STATE buffers in SOIC-20 packages, MM74HCT240WMX is inverting while MM74HCT244WMX is non-inverting, and their pin assignments differ - particularly for input/output mapping and enable polarity. Direct substitution would require PCB layout revision.

What is the maximum operating temperature range certified for the MM74HCT240WMX?

The MM74HCT240WMX is fully specified and tested over −55 °C to +125 °C ambient temperature. This extended range is explicitly guaranteed in the datasheet's Recommended Operating Conditions table and supported by characterization across all electrical parameters including propagation delay, output drive, and 3-STATE timing - making it suitable for under-hood automotive and industrial control applications.

Does the MM74HCT240WMX support hot-swap or live-insertion?

The MM74HCT240WMX does not include built-in hot-swap protection features such as slew-rate control or power-up sequencing. While its 3-STATE outputs and diode-clamped inputs provide basic robustness, safe live insertion requires external circuitry (e.g., series resistors, RC filters, and power-rail sequencing) to limit inrush current and prevent bus contention during plug-in events.

What package type and lead finish does the MM74HCT240WMX use?

The MM74HCT240WMX uses a Pb-free SOIC-20 wide-body package (case 751D−05) with gull-wing leads and matte tin (Sn) plating. The package dimensions are 12.8 mm × 7.5 mm × 2.5 mm, 1.27 mm pitch, and complies with JEDEC MS-013 standards. The "G" suffix in marking confirms RoHS-compliant lead finish.

MM74HCT240WMX Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74HCT

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 7.2mA, 7.2mA

Voltage - Supply:: 4.5V ~ 5.5V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOIC

MM74HCT240WMX FAQ

1.How can I place an order for MM74HCT240WMX through Aetrix?

Please submit a Request for Quotation (RFQ) for MM74HCT240WMX 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 MM74HCT240WMX reliable?

The price and inventory of MM74HCT240WMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HCT240WMX is usually 5 days.

3.What payment methods are accepted for MM74HCT240WMX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HCT240WMX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM74HCT240WMX?

MM74HCT240WMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM74HCT240WMX 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 MM74HCT240WMX?

For technical support, including MM74HCT240WMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HCT240WMX requirements.

6.How does Aetrix verify that MM74HCT240WMX is sourced from the original manufacturer or authorized distributors?

All MM74HCT240WMX 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 MM74HCT240WMX meets industry standards.

7.What is the process for return or replacement of MM74HCT240WMX?

All MM74HCT240WMX units undergo pre-shipment inspection (PSI). If there is an issue with MM74HCT240WMX, 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 MM74HCT240WMX part is unused and in its original packaging.

Return procedure for MM74HCT240WMX:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…