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Home > Products > Integrated Circuits (ICs) > Logic > Gates and Inverters

onsemi MM74HCT05M

Name: MM74HCT05M
Brand: onsemi
SKU: MM74HCT05M
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MM74HCT05M

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: MM74HCT05M.pdf

Description:: IC INVERTER 6CH 1-INP 14SOIC

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Product details

Overview

MM74HCT05M from onsemi is a hex inverter IC with open-drain outputs, fabricated in advanced silicon-gate CMOS technology. It provides LS-TTL pinout and voltage-threshold compatibility, 10 LS-TTL fanout capability, and operates across 4.5 V to 5.5 V supply with −40 °C to +85 °C temperature range-used in bus interface and wired-logic NOR applications.

For engineers reviewing the MM74HCT05M datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain drive strength, propagation delay under 1 kΩ load (10–12 ns typical), input compatibility with TTL/NMOS, and TSSOP-14 WB package suitability for high-density PCB layouts.

Technical Context

The MM74HCT05M implements six independent inverting buffers with open-drain outputs, requiring external pull-up resistors to realize wired-NOR logic. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) match LS-TTL levels, enabling direct replacement of 74LS05 in legacy designs without level-shifting.

It features internal clamp diodes on all inputs for ESD protection, supports up to ±25 mA DC output current per pin, and delivers guaranteed propagation delays of tPZL ≤ 28 ns and tPLZ ≤ 25 ns at VCC = 4.5–5.5 V, CL = 50 pF, and RL = 1 kΩ.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Hex inverter with open-drain outputs - enables wired-NOR bus arbitration and level-flexible interfacing
Supply Voltage Range	4.5 V to 5.5 V - compatible with standard 5 V TTL systems and tolerant of rail variation
Input Thresholds	VIH = 2.0 V, VIL = 0.8 V - ensures reliable recognition of LS-TTL logic levels
Propagation Delay	tPZL ≤ 28 ns, tPLZ ≤ 25 ns (VCC = 4.5–5.5 V, RL = 1 kΩ, CL = 50 pF) - defines maximum timing budget for synchronous bus control
Output Drive	±25 mA DC per pin - supports robust pull-down into 1 kΩ loads or heavier fanout
Operating Temperature	−40 °C to +85 °C - qualified for industrial ambient environments without derating
Power Dissipation	833 mW (TSSOP-14 WB) - sets thermal design margin for sustained operation in compact enclosures

Pinout & Package

TSSOP-14 WB (Case 948G), 14-pin thin shrink small outline package with 0.65 mm pitch, 5.0 mm × 4.4 mm body, and exposed pad not present - optimized for automated assembly and thermal performance in space-constrained applications.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 9, 11, 13	Inverter Input	CMOS-compatible digital input accepting TTL-level signals; protected by internal clamp diodes to VCC and GND
2, 4, 6, 8, 10, 12	Inverter Output (Open Drain)	Active-low output requiring external pull-up; sinks up to 25 mA; no internal pull-up or totem-pole structure
7	GND	Ground reference for all inputs, outputs, and internal circuitry; must be low-impedance connection
14	VCC	Positive supply rail (4.5–5.5 V); bypass capacitor recommended near pin for noise suppression

Key Features

Feature	Design Value
Open-drain outputs	Enables wired-NOR logic implementation without additional discrete components or level translators
LS-TTL pinout and threshold compatibility	Direct drop-in replacement for 74LS05 in existing PCBs - no layout or firmware changes required
Fanout of 10 LS-TTL loads	Drives multiple downstream TTL inputs without buffer amplification, reducing component count
Low quiescent ICC (≤20 µA)	Minimizes standby power in battery-backed or always-on control subsystems
Pb-free, halide-free packaging	Meets RoHS 2 and JEDEC MSL-1 requirements for lead-free reflow and long-term reliability

Applications

Industrial Bus Arbitration	Legacy TTL System Upgrade
Use Scenario: Multiple microcontrollers share a common interrupt line using wired-NOR topology to avoid contention. IC Role / Device Role / Timing Role: MM74HCT05M provides six independent open-drain inverters that condition and invert each controller's active-low interrupt signal before wire-ORing. Use Value: Eliminates need for external diodes or discrete transistors while preserving LS-TTL timing integrity and voltage compatibility.	Use Scenario: Replacing obsolete 74LS05 in an aging PLC I/O module to reduce power consumption and improve thermal margin. IC Role / Device Role / Timing Role: MM74HCT05M serves as a pin- and function-compatible upgrade with identical pinout and logic behavior but lower ICC and wider VCC tolerance. Use Value: Cuts quiescent power by >90% versus LS-TTL while maintaining full interoperability with existing 5 V backplane signals.
Level-Shifted Sensor Interface	Reset Signal Conditioning
Use Scenario: Interfacing 3.3 V GPIOs from an MCU to a 5 V peripheral bus where inverted reset assertion is required. IC Role / Device Role / Timing Role: MM74HCT05M accepts 3.3 V logic inputs (VIH = 2.0 V met), inverts, and drives open-drain output pulled to 5 V - acting as unidirectional level translator. Use Value: Achieves safe voltage translation without bidirectional translators or resistor dividers; avoids shoot-through risk.	Use Scenario: Generating synchronized active-low reset pulses for multiple ASICs sharing a common reset net. IC Role / Device Role / Timing Role: MM74HCT05M inverts and buffers a system reset signal, then wires its open-drain outputs together to form a shared reset bus with OR logic. Use Value: Ensures glitch-free reset assertion across devices even if individual sources deassert at slightly different times.

Industrial Bus Arbitration

Legacy TTL System Upgrade

Use Scenario: Multiple microcontrollers share a common interrupt line using wired-NOR topology to avoid contention.

IC Role / Device Role / Timing Role: MM74HCT05M provides six independent open-drain inverters that condition and invert each controller's active-low interrupt signal before wire-ORing.

Use Value: Eliminates need for external diodes or discrete transistors while preserving LS-TTL timing integrity and voltage compatibility.

Use Scenario: Replacing obsolete 74LS05 in an aging PLC I/O module to reduce power consumption and improve thermal margin.

IC Role / Device Role / Timing Role: MM74HCT05M serves as a pin- and function-compatible upgrade with identical pinout and logic behavior but lower ICC and wider VCC tolerance.

Use Value: Cuts quiescent power by >90% versus LS-TTL while maintaining full interoperability with existing 5 V backplane signals.

Level-Shifted Sensor Interface

Reset Signal Conditioning

Use Scenario: Interfacing 3.3 V GPIOs from an MCU to a 5 V peripheral bus where inverted reset assertion is required.

IC Role / Device Role / Timing Role: MM74HCT05M accepts 3.3 V logic inputs (VIH = 2.0 V met), inverts, and drives open-drain output pulled to 5 V - acting as unidirectional level translator.

Use Value: Achieves safe voltage translation without bidirectional translators or resistor dividers; avoids shoot-through risk.

Use Scenario: Generating synchronized active-low reset pulses for multiple ASICs sharing a common reset net.

IC Role / Device Role / Timing Role: MM74HCT05M inverts and buffers a system reset signal, then wires its open-drain outputs together to form a shared reset bus with OR logic.

Use Value: Ensures glitch-free reset assertion across devices even if individual sources deassert at slightly different times.

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HCT05DR	SOIC-14 package (Case 751EF), same electrical specs, 1077 mW PD rating vs. 833 mW for TSSOP	Preferred for through-hole prototyping or higher-power thermal budgets; less suitable for fine-pitch SMT lines	Select when board real estate allows larger footprint and thermal mass improves reliability in high-ambient conditions
74AHC05PW,118	Higher speed (tPD ≤ 7.5 ns), wider VCC range (2–5.5 V), but VIH/VIL thresholds differ (1.5 V/0.5 V) - not LS-TTL compatible	Not suitable as drop-in LS-TTL replacement; requires input voltage validation and may need redesign for marginal signal margins	Choose only for new designs prioritizing speed and dual-supply flexibility over backward compatibility

Compared with SN74HCT05DR and 74AHC05PW,118, the MM74HCT05M offers optimal balance of LS-TTL compatibility, TSSOP-14 miniaturization, and industrial temperature support - making it the preferred choice for retrofitting legacy 5 V systems where pinout fidelity and thermal density are critical.

Availability

MM74HCT05M is available at Aetrix Electronics and suitable for industrial bus arbitration, legacy TTL system upgrades, level-shifted sensor interfaces, and reset signal conditioning requiring stable component supply and long-lifecycle support.

Supply support for MM74HCT05M 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

The MM74HCT05M belongs to onsemi's HCT logic family, engineered specifically to bridge TTL and CMOS domains with LS-TTL compatibility, low power, and robust industrial operating ranges.

FAQ

What is the primary logic function of the MM74HCT05M?

The MM74HCT05M is a hex inverter IC with six independent open-drain outputs. Each inverter performs logical inversion (NOT function) and requires an external pull-up resistor to implement wired-NOR logic. Its design targets direct replacement of 74LS05 in legacy systems while offering lower power consumption and improved noise immunity. The MM74HCT05M does not include internal pull-ups or totem-pole outputs - all outputs are strictly open-drain.

Does the MM74HCT05M support 3.3 V input signals?

Yes, the MM74HCT05M reliably accepts 3.3 V logic-high inputs because its minimum VIH is specified at 2.0 V (guaranteed over −40 °C to +85 °C). Since 3.3 V exceeds this threshold, the device interprets such inputs as valid HIGH. However, it remains a 5 V–only supply device (VCC = 4.5–5.5 V), so output voltage swing is referenced to 5 V, requiring appropriate pull-up configuration for interfacing with 3.3 V receivers. This behavior is confirmed in the MM74HCT05M datasheet's DC Electrical Characteristics table.

What package type is used for the MM74HCT05M?

The MM74HCT05M uses the TSSOP-14 WB package (Case 948G), a 14-pin thin shrink small outline package with 0.65 mm lead pitch, 5.0 mm × 4.4 mm body dimensions, and no exposed thermal pad. This package is distinct from the SOIC-14 variant (MM74HCT05MX) and is optimized for high-density surface-mount assembly. Mechanical drawings and soldering footprint data are provided in the official onsemi package outline document 98ASH70246A.

Can the MM74HCT05M replace a 74LS05 directly on an existing PCB?

Yes - the MM74HCT05M is explicitly designed as a pinout- and threshold-compatible replacement for the 74LS05. It matches the same 14-pin arrangement, input voltage thresholds (VIH = 2.0 V, VIL = 0.8 V), and wired-NOR functionality. No PCB modifications are needed. The MM74HCT05M also reduces quiescent current from ~15 mA (74LS05) to ≤20 µA, lowering system power and thermal load without altering timing or logic behavior in typical applications.

What is the maximum output sink current per pin for the MM74HCT05M?

The MM74HCT05M guarantees a maximum DC output sink current of ±25 mA per pin, as specified in the Absolute Maximum Ratings table. This rating applies to steady-state conditions and supports driving 1 kΩ pull-up loads or heavier fanout configurations. For transient or capacitive loads, designers should verify voltage droop and rise/fall times against system timing budgets. The value is measured and validated per the MM74HCT05M datasheet revision 4 (May 2025).

MM74HCT05M Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74HCT

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Bulk

Product Status:: Obsolete

Logic Type:: Inverter

Number of Circuits:: 6

Number of Inputs:: 1

Features:: Open Drain

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Max):: 2 µA

Current - Output High, Low:: -, 4.8mA

Input Logic Level - Low:: 0.8V

Input Logic Level - High:: 2V

Max Propagation Delay @ V, Max CL:: 15ns @ 5V, 50pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SOIC

MM74HCT05M FAQ

1.How can I place an order for MM74HCT05M through Aetrix?

Please submit a Request for Quotation (RFQ) for MM74HCT05M 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 MM74HCT05M reliable?

The price and inventory of MM74HCT05M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MM74HCT05M is usually 5 days.

3.What payment methods are accepted for MM74HCT05M?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MM74HCT05M transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MM74HCT05M?

MM74HCT05M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MM74HCT05M 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 MM74HCT05M?

For technical support, including MM74HCT05M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MM74HCT05M requirements.

6.How does Aetrix verify that MM74HCT05M is sourced from the original manufacturer or authorized distributors?

All MM74HCT05M 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 MM74HCT05M meets industry standards.

7.What is the process for return or replacement of MM74HCT05M?

All MM74HCT05M units undergo pre-shipment inspection (PSI). If there is an issue with MM74HCT05M, 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 MM74HCT05M part is unused and in its original packaging.

Return procedure for MM74HCT05M:

1.Submit a request within 90 days.

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

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