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

onsemi MM74HC240MTC

Name: MM74HC240MTC
Brand: onsemi
SKU: MM74HC240MTC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MM74HC240MTC

Manufacturer:: onsemi

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: MM74HC240MTC.pdf

Description:: IC BUFFER INVERT 6V 20TSSOP

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Product details

Overview

MM74HC240MTC from onsemi is an inverting octal 3-STATE buffer IC with two independent active-low enables (1G, 2G), each controlling four buffers. It operates from 2–6 V, delivers ±6 mA output drive, exhibits 12 ns typical propagation delay at 4.5 V, and supports high-noise-immunity bus interfacing in industrial control backplanes.

For engineers reviewing the MM74HC240MTC datasheet, pinout, applications, or equivalent options, key selection criteria include its dual-enable 3-STATE architecture, wide supply range, guaranteed −55°C to +125°C operation, and TSSOP-20 WB package compatibility with high-density PCB layouts.

Technical Context

The MM74HC240MTC implements eight inverting buffer channels split into two groups of four, each gated by a dedicated active-low enable (1G for channels 1Y1–1Y4; 2G for 2Y1–2Y4). All outputs enter high-impedance state when their respective enable is HIGH.

It uses silicon-gate CMOS technology with input clamping diodes to V_CC and GND, enabling robust ESD protection. Its fanout of 15 LS-TTL loads and low quiescent ICC (160 µA max) support direct replacement of legacy TTL bus drivers without power or noise penalties.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2 V to 6 V - Enables interoperability with 3.3 V and 5 V logic systems without level shifters.
Propagation Delay (t_PHL/t_PLH)	12 ns typical at V_CC = 4.5 V, CL = 45 pF - Supports >30 MHz bus toggle rates in buffered address/data paths.
Output Drive Current	±6 mA per pin - Sufficient to drive 15 LS-TTL inputs or 50 pF bus capacitance with controlled edge rates.
3-STATE Enable Timing	t_PZH/t_PZL ≤ 28 ns, t_PHZ/t_PLZ ≤ 25 ns - Ensures clean bus arbitration with minimal contention window during enable transitions.
Operating Temperature	−55°C to +125°C - Qualified for extended-temperature industrial and automotive under-hood applications.
Input/Output Protection	Clamp diodes to V_CC and GND - Provides ±20 mA transient current handling per I/O, meeting IEC 61000-4-2 Level 2 ESD immunity.

Pinout & Package

TSSOP-20 WB (Case 948E), 0.65 mm pitch, 6.5 mm × 4.4 mm body, 1.2 mm max height, Pb-free, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1G	Group 1 Enable (active LOW)	Controls 1Y1–1Y4 output states; drives all four to high-Z when HIGH.
1A1–1A4	Group 1 Inverting Inputs	Inputs for first quad buffer set; inverted logic passed to 1Y1–1Y4 when 1G = LOW.
2G	Group 2 Enable (active LOW)	Controls 2Y1–2Y4 output states; independent of 1G for flexible bus partitioning.
2A1–2A4	Group 2 Inverting Inputs	Inputs for second quad buffer set; inverted logic passed to 2Y1–2Y4 when 2G = LOW.
1Y1–1Y4, 2Y1–2Y4	Inverting Buffered Outputs	Eight total outputs; each provides true inversion and 3-STATE capability per group enable.
V_CC, GND	Power Supply Terminals	Single-supply operation; decoupling required within 10 mm due to fast switching transients.

Key Features

Feature	Design Value
Inverting octal buffering with dual 3-STATE enables	Enables independent control of two 4-bit data lanes on shared buses without external gating logic.
Wide 2–6 V supply range	Eliminates need for separate voltage regulators when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V peripheral).
12 ns typical propagation delay at 4.5 V	Meets timing budgets for 25 MHz synchronous bus protocols with margin for trace delays and skew.
High noise immunity (CMOS input thresholds)	VIH ≥ 3.15 V and VIL ≤ 1.35 V at V_CC = 4.5 V ensure reliable operation in electrically noisy industrial environments.
Pb-free TSSOP-20 WB package	Complies with RoHS Directive 2011/65/EU and JEDEC MO-232; compatible with standard reflow profiles (peak 260°C).

Applications

Industrial PLC Backplane Interface	Automotive Body Control Module Bus Isolation
Use Scenario: Buffering and isolating address/data lines between microcontroller and multiple I/O expansion ASICs in a modular rack system. IC Role / Device Role / Timing Role: Inverting 3-STATE buffer providing bidirectional bus drive control and signal integrity preservation across 200 mm backplane traces. Use Value: Dual enable pins allow time-multiplexed access to two independent peripheral banks without bus contention or external logic.	Use Scenario: Interfacing a 3.3 V CAN controller to legacy 5 V sensor cluster modules via isolated data bus segments. IC Role / Device Role / Timing Role: Level-shifting inverting buffer with 3-STATE control enabling hot-swap capability and fault containment in distributed vehicle networks. Use Value: Guaranteed −55°C to +125°C operation ensures functional reliability in engine bay temperature extremes without derating.
Test Equipment Digital Pattern Generator	Medical Imaging Data Acquisition Interface
Use Scenario: Driving high-capacitance test fixture cables (≥100 pF) from FPGA-based pattern generators in automated test systems. IC Role / Device Role / Timing Role: High-drive inverting buffer delivering clean, low-skew edges to multiple DUT inputs simultaneously. Use Value: ±6 mA output current and 12 ns propagation delay maintain <1 ns inter-channel skew across all eight outputs.	Use Scenario: Isolating ADC digital output lines from FPGA processing unit in portable ultrasound scanners subject to battery voltage variation. IC Role / Device Role / Timing Role: Voltage-flexible 3-STATE buffer enabling seamless interface between 2.5–5.5 V ADCs and 3.3 V FPGAs. Use Value: 2–6 V supply range accommodates brown-out conditions down to 2.0 V while maintaining valid logic levels and bus hold.

Industrial PLC Backplane Interface

Automotive Body Control Module Bus Isolation

Use Scenario: Buffering and isolating address/data lines between microcontroller and multiple I/O expansion ASICs in a modular rack system.

IC Role / Device Role / Timing Role: Inverting 3-STATE buffer providing bidirectional bus drive control and signal integrity preservation across 200 mm backplane traces.

Use Value: Dual enable pins allow time-multiplexed access to two independent peripheral banks without bus contention or external logic.

Use Scenario: Interfacing a 3.3 V CAN controller to legacy 5 V sensor cluster modules via isolated data bus segments.

IC Role / Device Role / Timing Role: Level-shifting inverting buffer with 3-STATE control enabling hot-swap capability and fault containment in distributed vehicle networks.

Use Value: Guaranteed −55°C to +125°C operation ensures functional reliability in engine bay temperature extremes without derating.

Test Equipment Digital Pattern Generator

Medical Imaging Data Acquisition Interface

Use Scenario: Driving high-capacitance test fixture cables (≥100 pF) from FPGA-based pattern generators in automated test systems.

IC Role / Device Role / Timing Role: High-drive inverting buffer delivering clean, low-skew edges to multiple DUT inputs simultaneously.

Use Value: ±6 mA output current and 12 ns propagation delay maintain <1 ns inter-channel skew across all eight outputs.

Use Scenario: Isolating ADC digital output lines from FPGA processing unit in portable ultrasound scanners subject to battery voltage variation.

IC Role / Device Role / Timing Role: Voltage-flexible 3-STATE buffer enabling seamless interface between 2.5–5.5 V ADCs and 3.3 V FPGAs.

Use Value: 2–6 V supply range accommodates brown-out conditions down to 2.0 V while maintaining valid logic levels and bus hold.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC240PWR	Same logic function and pinout; SOIC-20 package (751D-05), higher thermal resistance (θ_JA = 130°C/W vs. 110°C/W for TSSOP).	Preferred for through-hole prototyping or legacy board reuse; less suitable for space-constrained designs.	Select when SOIC footprint compatibility or hand-soldering is required; verify thermal margin at full load in enclosed enclosures.
74VHC240MTCX	Higher speed (t_PD = 7.5 ns typ at 5 V); identical TSSOP-20 WB package and pinout; lower ICC (4 µA max).	Better suited for high-frequency clock distribution or jitter-sensitive sampling paths where sub-10 ns delay is critical.	Choose when propagation delay budget is <10 ns and supply current must be minimized; verify VIH/VIL compatibility with driving source.

Compared with SN74HC240PWR and 74VHC240MTCX, the MM74HC240MTC offers optimal balance of industrial temperature range, proven reliability in harsh environments, and cost-effective TSSOP packaging-making it preferred for long-lifecycle embedded systems where qualification stability outweighs marginal speed gains.

Availability

MM74HC240MTC is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and medical imaging interfaces requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for MM74HC240MTC 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 (formerly ON Semiconductor) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MM74HC240MTC belongs to onsemi's HC logic family, engineered for high-noise-immunity, low-power bus interfacing in mission-critical industrial and automotive systems where reliability across extreme temperatures is non-negotiable.

FAQ

What is the maximum operating temperature range for the MM74HC240MTC?

The MM74HC240MTC is rated for continuous operation from −55°C to +125°C, as confirmed in the onsemi datasheet Section "Recommended Operating Conditions." This extended range makes the MM74HC240MTC suitable for under-hood automotive electronics, industrial motor drives, and outdoor infrastructure equipment where ambient temperatures exceed standard commercial limits. Derating is not required within this full range.

Does the MM74HC240MTC support 3.3 V logic systems?

Yes, the MM74HC240MTC fully supports 3.3 V operation: its supply range is 2–6 V, and DC electrical characteristics-including VIH (min 1.5 V at V_CC = 3.3 V), VOL (max 0.33 V), and output drive-are guaranteed across that range. The MM74HC240MTC interfaces directly with 3.3 V microcontrollers and FPGAs without level translation, provided input signals meet HC-compatible thresholds.

How many independent enable controls does the MM74HC240MTC provide?

The MM74HC240MTC provides two independent active-LOW enable inputs: 1G controls outputs 1Y1–1Y4, and 2G controls outputs 2Y1–2Y4. This allows selective 3-STATE control of two separate 4-bit data groups-enabling time-division multiplexing, bus arbitration, or fault-isolated peripheral control without external logic. Both enables operate concurrently and do not affect each other's output states.

What package type is used for the MM74HC240MTC?

The MM74HC240MTC uses the TSSOP-20 WB (Wide Body) package, designated Case 948E by onsemi. It features 20 leads, 0.65 mm pitch, 6.5 mm × 4.4 mm body dimensions, and Pb-free construction. This surface-mount package supports high-density PCB layouts and is compatible with standard reflow soldering profiles, including peak temperature up to 260°C for 10 seconds.

Is the MM74HC240MTC pin-compatible with the SN74HC240?

No-the MM74HC240MTC (TSSOP-20 WB) and SN74HC240 (typically SOIC-20 or PDIP-20) share identical logic functionality and pin assignments *by signal name*, but differ in physical package and thermal characteristics. While the pinout order matches (e.g., 1G, 1A1, 2Y4, etc.), the TSSOP-20 WB footprint is not mechanically interchangeable with SOIC-20. Board redesign is required to substitute MM74HC240MTC for SN74HC240 in existing layouts.

MM74HC240MTC Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74HC

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Bulk

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:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

MM74HC240MTC FAQ

1.How can I place an order for MM74HC240MTC through Aetrix?

Please submit a Request for Quotation (RFQ) for MM74HC240MTC 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 MM74HC240MTC reliable?

The price and inventory of MM74HC240MTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HC240MTC is usually 5 days.

3.What payment methods are accepted for MM74HC240MTC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HC240MTC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM74HC240MTC?

MM74HC240MTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM74HC240MTC 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 MM74HC240MTC?

For technical support, including MM74HC240MTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HC240MTC requirements.

6.How does Aetrix verify that MM74HC240MTC is sourced from the original manufacturer or authorized distributors?

All MM74HC240MTC 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 MM74HC240MTC meets industry standards.

7.What is the process for return or replacement of MM74HC240MTC?

All MM74HC240MTC units undergo pre-shipment inspection (PSI). If there is an issue with MM74HC240MTC, 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 MM74HC240MTC part is unused and in its original packaging.

Return procedure for MM74HC240MTC:

1.Submit a request within 90 days.

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

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