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

onsemi MC74ACT05MELG

Name: MC74ACT05MELG
Brand: onsemi
SKU: MC74ACT05MELG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74ACT05MELG

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: 14-SOIC (0.209", 5.30mm Width)

Datasheet:: MC74ACT05MELG.pdf

Description:: IC INVERTER OD 6CH 1IN SOEIAJ-14

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Product details

Overview

MC74ACT05MELG from onsemi is a hex inverter IC with six independent open-drain outputs, designed for level-shifting and wired-OR logic applications in 5 V TTL-compatible digital systems. It features TTL-compatible inputs, ±24 mA output sink capability, 8.5 ns max propagation delay at 5 V, and operates across −40°C to +85°C. It is used in bus interface circuits requiring active-low open-drain drive.

For engineers reviewing the MC74ACT05MELG datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, SOIC-14 package mapping, confirmed open-drain logic behavior, input compatibility details, and real-world selection guidance for bus buffering and voltage-level translation.

Technical Context

The MC74ACT05MELG implements six identical inverting buffers, each with an open-drain output stage enabling wired-AND/wired-OR configurations. Its TTL-compatible inputs accept 0.8 V low and 2.0 V high thresholds at 5 V supply, ensuring interoperability with legacy 74LS logic without pull-up resistors.

Each output delivers up to 24 mA sink current with VOL ≤ 0.1 V at IOL = 24 mA, supporting direct connection to 5 V buses or external pull-ups. Propagation delay is specified at 1.0–8.5 ns (tPLZ/tPZL) under 50 pF load, confirming high-speed operation suitable for address/data strobing and enable control.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Hex inverter with open-drain outputs - enables wired-OR bus structures and level translation.
Supply Voltage Range	4.5 V to 5.5 V - strictly 5 V nominal operation; not rated for 3.3 V or wide-range use.
Input Compatibility	TTL-compatible - VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.5 V; interfaces directly with 74LS without pull-ups.
Output Sink Current	24 mA per channel - supports driving standard 5 V TTL loads or external pull-up networks.
Propagation Delay	≤ 8.5 ns (max) at VCC = 5.0 V, CL = 50 pF - ensures timing integrity in fast synchronous bus control.
Operating Temperature	−40°C to +85°C - qualified for industrial ambient environments without derating.
ESD Rating	HBM > 2000 V - provides robust handling during board assembly and system integration.

Pinout & Package

MC74ACT05MELG is packaged in a Pb-free SOIC-14 (Case 751A) with 1.27 mm pitch, 8.75 mm × 3.9 mm body, and standard JEDEC outline. Pin 1 is index-marked; Pin 7 = GND, Pin 14 = VCC.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 9, 11, 13	Inverter Input (A1–A6)	CMOS/TTL-compatible logic inputs; no internal pull-up; require external termination if floating.
2, 4, 6, 8, 10, 12	Open-Drain Output (Y1–Y6)	Active-low outputs; must be externally pulled up to define HIGH state; support wired-OR logic.
7	GND	Ground reference for all inputs, outputs, and internal circuitry; requires low-impedance PCB return path.
14	VCC	5 V power supply input; bypassing with 0.1 µF ceramic capacitor near pin is mandatory for noise immunity.

Key Features

Feature	Design Value
TTL-compatible inputs	Eliminates need for external level-shifters when interfacing with 74LS/ALS families in mixed-logic systems.
Open-drain outputs	Enables shared-bus arbitration, I²C-style communication, and flexible voltage translation via external pull-up selection.
24 mA output sink	Drives standard 5 V TTL loads or multiple CMOS inputs without buffer amplification.
Pb-free SOIC-14 package	Complies with RoHS Directive 2011/65/EU; compatible with standard reflow profiles (MSL Level 1).
Industrial temperature range	Validated operation from −40°C to +85°C ensures reliability in factory automation and outdoor equipment.

Applications

Bus Interface Logic	I²C Bus Buffering
Use Scenario: Isolating and extending 5 V parallel address/data buses between microcontroller and peripheral ICs. IC Role / Device Role / Timing Role: Hex inverter provides active-low enable control and polarity inversion for chip select and write strobe signals. Use Value: Open-drain outputs allow multiple devices to share a common bus line without contention; 8.5 ns delay preserves setup/hold timing margins.	Use Scenario: Level-shifting and fan-out extension of I²C SDA/SCL lines between 3.3 V MCU and 5 V sensor nodes. IC Role / Device Role / Timing Role: Acts as bidirectional open-drain repeater; inputs accept 3.3 V logic, outputs sink 5 V pull-up current. Use Value: TTL-compatible inputs recognize 3.3 V high levels; 24 mA sink capacity supports longer traces and higher capacitance loads.
LED Driver Interface	Reset Signal Conditioning
Use Scenario: Driving common-anode LED arrays from microcontroller GPIO pins with inverted logic control. IC Role / Device Role / Timing Role: Inverts active-high MCU output to active-low LED cathode drive; open-drain allows shared current-limiting resistor. Use Value: 24 mA per channel supports up to 20 mA LED current with margin; industrial temp rating ensures stable brightness over environment.	Use Scenario: Generating synchronized, glitch-free active-low reset pulses for multiple ICs sharing a single reset controller. IC Role / Device Role / Timing Role: Inverts and buffers reset signal; open-drain outputs permit OR-ing of multiple reset sources. Use Value: Low propagation delay (≤8.5 ns) prevents race conditions; 24 mA sink drives long reset traces with minimal rise time degradation.

Bus Interface Logic

I²C Bus Buffering

Use Scenario: Isolating and extending 5 V parallel address/data buses between microcontroller and peripheral ICs.

IC Role / Device Role / Timing Role: Hex inverter provides active-low enable control and polarity inversion for chip select and write strobe signals.

Use Value: Open-drain outputs allow multiple devices to share a common bus line without contention; 8.5 ns delay preserves setup/hold timing margins.

Use Scenario: Level-shifting and fan-out extension of I²C SDA/SCL lines between 3.3 V MCU and 5 V sensor nodes.

IC Role / Device Role / Timing Role: Acts as bidirectional open-drain repeater; inputs accept 3.3 V logic, outputs sink 5 V pull-up current.

Use Value: TTL-compatible inputs recognize 3.3 V high levels; 24 mA sink capacity supports longer traces and higher capacitance loads.

LED Driver Interface

Reset Signal Conditioning

Use Scenario: Driving common-anode LED arrays from microcontroller GPIO pins with inverted logic control.

IC Role / Device Role / Timing Role: Inverts active-high MCU output to active-low LED cathode drive; open-drain allows shared current-limiting resistor.

Use Value: 24 mA per channel supports up to 20 mA LED current with margin; industrial temp rating ensures stable brightness over environment.

Use Scenario: Generating synchronized, glitch-free active-low reset pulses for multiple ICs sharing a single reset controller.

IC Role / Device Role / Timing Role: Inverts and buffers reset signal; open-drain outputs permit OR-ing of multiple reset sources.

Use Value: Low propagation delay (≤8.5 ns) prevents race conditions; 24 mA sink drives long reset traces with minimal rise time degradation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverter with open-drain applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LVC06APWR	3.3 V only (1.65–3.6 V); CMOS inputs; 24 mA sink; 3.5 ns max tPD.	Not TTL-compatible; requires level-shifter for 5 V systems; better for modern low-voltage designs.	Select when operating exclusively at 3.3 V and needing faster speed or lower ICC.
74HC05PW,118	2–6 V supply; CMOS inputs (VIH = 70% VCC); 5.2 mA sink; 20 ns max tPD at 4.5 V.	Lower drive strength and slower speed; lacks TTL input compatibility; wider VCC range.	Choose for cost-sensitive industrial designs where 5 V TTL interface is unnecessary and lower power is prioritized.

Compared with SN74LVC06APWR and 74HC05PW,118, the MC74ACT05MELG uniquely delivers 5 V TTL-compatible inputs and 24 mA sink in a proven industrial SOIC-14 package-making it the only drop-in replacement for legacy LS05-based bus interface designs requiring no layout or logic change.

Availability

MC74ACT05MELG is available at Aetrix Electronics and suitable for industrial bus interface, I²C signal conditioning, LED driver control, and reset signal distribution requiring stable component supply and long-term manufacturability.

Supply support for MC74ACT05MELG 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, high-performance silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC74ACT05MELG belongs to onsemi's legacy 74ACT logic family, engineered specifically for pin-compatible upgrades of 74LS05 in industrial control and instrumentation systems requiring TTL input compatibility and robust 5 V open-drain drive.

FAQ

What is the supply voltage range for MC74ACT05MELG?

The MC74ACT05MELG operates strictly within 4.5 V to 5.5 V. It is not rated for 3.3 V operation, and its TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V) are guaranteed only across this 5 V range. Using voltages outside this window may result in undefined logic states or parametric failure. The MC74ACT05MELG datasheet specifies no functionality below 4.5 V.

Does MC74ACT05MELG have internal pull-up resistors on its outputs?

No, the MC74ACT05MELG has true open-drain outputs with no internal pull-up resistors. Each output (pins 2, 4, 6, 8, 10, 12) requires an external pull-up resistor to define the HIGH state. Typical values range from 1 kΩ to 10 kΩ depending on bus capacitance and rise-time requirements. This architecture enables wired-OR logic and voltage-level translation, which is a core design feature of the MC74ACT05MELG.

Is MC74ACT05MELG pin-compatible with the 74LS05?

Yes, the MC74ACT05MELG is explicitly designed as a pin-compatible replacement for the 74LS05 in SOIC-14 packaging. Pin assignments for inputs (A1–A6), outputs (Y1–Y6), VCC (pin 14), and GND (pin 7) match exactly. This allows direct substitution in existing LS05 layouts without PCB modification-provided the 5 V supply and loading conditions meet MC74ACT05MELG specifications.

What is the maximum output sink current per channel for MC74ACT05MELG?

The MC74ACT05MELG guarantees 24 mA sink current per output channel at VCC = 5.5 V and TA = −40°C to +85°C, with VOL ≤ 0.1 V. This rating is validated under continuous DC conditions and supports driving standard TTL loads or multiple CMOS inputs. Exceeding 24 mA risks violating VOL specification or thermal limits, especially in multi-channel simultaneous operation.

Can MC74ACT05MELG be used in 3.3 V systems?

No, the MC74ACT05MELG is not characterized or guaranteed for 3.3 V operation. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive strength are specified only at 4.5–5.5 V. At 3.3 V, input recognition becomes unreliable and output VOL may exceed specification. For 3.3 V systems, consider the SN74LVC06A instead-the MC74ACT05MELG is intended solely for 5 V TTL-compatible applications.

MC74ACT05MELG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ACT

Package/Case:: 14-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

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):: 4 µA

Current - Output High, Low:: -, 24mA

Input Logic Level - Low:: 0.8V

Input Logic Level - High:: 2V

Max Propagation Delay @ V, Max CL:: 8.5ns @ 5V, 50pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOEIAJ-14

MC74ACT05MELG FAQ

1.How can I place an order for MC74ACT05MELG through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74ACT05MELG 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 MC74ACT05MELG reliable?

The price and inventory of MC74ACT05MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT05MELG is usually 5 days.

3.What payment methods are accepted for MC74ACT05MELG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT05MELG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74ACT05MELG?

MC74ACT05MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74ACT05MELG 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 MC74ACT05MELG?

For technical support, including MC74ACT05MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT05MELG requirements.

6.How does Aetrix verify that MC74ACT05MELG is sourced from the original manufacturer or authorized distributors?

All MC74ACT05MELG 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 MC74ACT05MELG meets industry standards.

7.What is the process for return or replacement of MC74ACT05MELG?

All MC74ACT05MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT05MELG, 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 MC74ACT05MELG part is unused and in its original packaging.

Return procedure for MC74ACT05MELG:

1.Submit a request within 90 days.

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

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