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

onsemi MC74ACT08MELG

Name: MC74ACT08MELG
Brand: onsemi
SKU: MC74ACT08MELG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74ACT08MELG

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: -

Datasheet:: MC74ACT08MELG.pdf

Description:: IC GATE AND

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Product details

Overview

MC74ACT08MELG from onsemi is a quad 2-input AND gate logic IC with TTL-compatible inputs, designed for high-speed digital signal routing in 5 V systems. It delivers ±24 mA output drive, supports 5.0 V ±0.5 V supply operation, exhibits 9.0 ns max propagation delay (tPLH/tPHL), and operates across −40°C to +85°C ambient temperature - enabling use in industrial control bus conditioning and microcontroller peripheral interfacing.

For engineers reviewing the MC74ACT08MELG datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed 5.0 V TTL-level input compatibility, rail-to-rail output swing under load, low 4.0 µA quiescent ICC, and SOEIAJ-14 package footprint for space-constrained PCB layouts.

Technical Context

The MC74ACT08MELG implements four independent AND gates in a single monolithic CMOS structure with buffered outputs. Its input stage is specifically engineered for TTL voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), ensuring seamless interfacing with legacy 5 V TTL logic families without level-shifting circuitry.

Each gate provides symmetrical sourcing and sinking capability up to 24 mA per output, with guaranteed VOH ≥ 3.76 V and VOL ≤ 0.44 V at IOL/IOH = ±24 mA and VCC = 5.5 V. AC performance is characterized at CL = 50 pF, delivering 1.0–9.0 ns propagation delay over full temperature and voltage range.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Quad 2-input AND gate - enables compact implementation of four independent Boolean conjunctions in one IC
Supply Voltage Range	4.5 V to 5.5 V - compatible only with regulated 5 V systems; not rated for 3.3 V or wide-range operation
Input Compatibility	TTL-compatible - accepts standard 5 V TTL logic levels (0.8 V low / 2.0 V high thresholds) directly
Output Drive	±24 mA per output - sufficient to drive multiple 74-series loads or small LEDs without external buffers
Propagation Delay	≤9.0 ns (max) at VCC = 5.0 V, CL = 50 pF - supports >50 MHz toggle rates in clean signal paths
Quiescent Supply Current	≤4.0 µA at VCC = 5.5 V - negligible static power draw in always-on logic subsystems
Operating Temperature	−40°C to +85°C - qualified for industrial-grade embedded applications without derating

Pinout & Package

MC74ACT08MELG is housed in a 14-lead SOEIAJ (Small Outline EIAJ) package - a gull-wing surface-mount variant identical in pin count and layout to SOIC-14 but with narrower body width (5.10–5.45 mm) and tighter lead pitch (1.27 mm). This package supports automated assembly and offers improved thermal resistance versus PDIP.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 8, 9, 11, 12	Input A/B of Gates 1–4	Dedicated logic inputs; each pair (e.g., pins 1&2) feeds one AND gate; no shared or multiplexed inputs
3, 6, 10, 13	Output Y of Gates 1–4	CMOS push-pull outputs; capable of sourcing/sinking 24 mA while maintaining VOH/VOL specs
7	GND	Ground reference for all inputs, outputs, and internal circuitry; must be low-impedance connection
14	VCC	Positive supply terminal; requires local 0.1 µF ceramic decoupling adjacent to pin

Key Features

Feature	Design Value
TTL-compatible inputs	Enables direct connection to legacy 74LS/74F outputs without level shifters or pull-ups
24 mA output drive	Drives up to 10 LSTTL loads or interfaces directly with optocouplers and small-signal MOSFET gates
Pb-free SOEIAJ-14 package	Meets RoHS Directive 2011/65/EU; compatible with standard reflow profiles including JEDEC J-STD-020
Low quiescent current	4.0 µA max ICC allows use in battery-backed or low-power standby logic paths without significant leakage impact
Industrial temperature range	Guaranteed functionality from −40°C to +85°C ambient eliminates need for thermal margining in enclosure design

Applications

Industrial PLC Input Conditioning	Microcontroller GPIO Expansion
Use Scenario: Isolating and debouncing mechanical switch inputs before feeding into a PLC's digital input module. IC Role / Device Role / Timing Role: Logic-level AND gate performing active-high enable gating on opto-isolated switch signals. Use Value: Ensures only valid, synchronized switch closures pass through - eliminating contact bounce artifacts without software polling overhead.	Use Scenario: Expanding limited GPIO count on an MCU by combining two sensor interrupt lines into a single shared IRQ input. IC Role / Device Role / Timing Role: Hardware-based interrupt arbitration gate that asserts IRQ only when both sensors require attention simultaneously. Use Value: Reduces firmware complexity and interrupt latency compared to software polling, while preserving deterministic response timing.
Legacy Bus Interface Logic	Test Equipment Signal Gating
Use Scenario: Interfacing modern 5 V CMOS controllers with older TTL-based instrumentation buses (e.g., GPIB handshaking lines). IC Role / Device Role / Timing Role: Level-adaptive AND gate synchronizing STB and ATN handshake signals in IEEE-488 compliant peripherals. Use Value: Eliminates need for discrete resistor networks or dedicated level translators - reducing BOM count and board area.	Use Scenario: Enabling precise time-gated sampling of analog waveforms in automated test equipment front-ends. IC Role / Device Role / Timing Role: High-fidelity digital gate controlling sample-and-hold enable pulses synchronized to system clock edges. Use Value: Achieves sub-10 ns pulse edge fidelity critical for <100 MHz sampling accuracy without jitter-induced aperture error.

Industrial PLC Input Conditioning

Microcontroller GPIO Expansion

Use Scenario: Isolating and debouncing mechanical switch inputs before feeding into a PLC's digital input module.

IC Role / Device Role / Timing Role: Logic-level AND gate performing active-high enable gating on opto-isolated switch signals.

Use Value: Ensures only valid, synchronized switch closures pass through - eliminating contact bounce artifacts without software polling overhead.

Use Scenario: Expanding limited GPIO count on an MCU by combining two sensor interrupt lines into a single shared IRQ input.

IC Role / Device Role / Timing Role: Hardware-based interrupt arbitration gate that asserts IRQ only when both sensors require attention simultaneously.

Use Value: Reduces firmware complexity and interrupt latency compared to software polling, while preserving deterministic response timing.

Legacy Bus Interface Logic

Test Equipment Signal Gating

Use Scenario: Interfacing modern 5 V CMOS controllers with older TTL-based instrumentation buses (e.g., GPIB handshaking lines).

IC Role / Device Role / Timing Role: Level-adaptive AND gate synchronizing STB and ATN handshake signals in IEEE-488 compliant peripherals.

Use Value: Eliminates need for discrete resistor networks or dedicated level translators - reducing BOM count and board area.

Use Scenario: Enabling precise time-gated sampling of analog waveforms in automated test equipment front-ends.

IC Role / Device Role / Timing Role: High-fidelity digital gate controlling sample-and-hold enable pulses synchronized to system clock edges.

Use Value: Achieves sub-10 ns pulse edge fidelity critical for <100 MHz sampling accuracy without jitter-induced aperture error.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input AND gate applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT08D	Same logic function, TTL-compatible inputs, and 5 V operation; identical AC/DC specs but packaged in SOIC-14 (wider body, 3.9 mm vs 5.1 mm width)	SOIC-14 footprint requires PCB layout change; otherwise drop-in functional replacement in 5 V systems	Select SN74ACT08D if SOIC-14 is already standardized in your assembly process or preferred for manual rework access.
74VHC08M	Higher speed (5.5 ns max tPD), wider supply range (2–5.5 V), but CMOS-only inputs (VIH = 3.5 V min at VCC = 5 V) - not TTL-compatible	Cannot interface directly with 74LS outputs without level translation; suitable only for pure CMOS environments	Choose 74VHC08M only when operating below 5 V or requiring faster propagation than MC74ACT08MELG provides.

Compared with SN74ACT08D and 74VHC08M, the MC74ACT08MELG uniquely balances TTL interoperability, industrial temperature rating, and SOEIAJ space efficiency - making it optimal for retrofitting legacy 5 V systems where board real estate and input compatibility are constrained.

Availability

MC74ACT08MELG is available at Aetrix Electronics and suitable for industrial PLC input conditioning, microcontroller GPIO expansion, legacy bus interface logic, and test equipment signal gating requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MC74ACT08MELG 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 specializing in energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.

The MC74ACT08MELG belongs to the 74ACT logic family - engineered for high-speed, TTL-compatible 5 V digital interfacing in industrial and instrumentation systems where reliability and legacy compatibility are critical.

FAQ

What logic family does MC74ACT08MELG belong to, and how does it differ from standard 74AC devices?

The MC74ACT08MELG belongs to the 74ACT logic family, distinguished by TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V). Unlike 74AC variants - which require CMOS-level inputs (VIH ≈ 3.5 V at 5 V) - the MC74ACT08MELG interfaces directly with 74LS and other TTL outputs without level-shifting components, simplifying mixed-logic designs.

Is MC74ACT08MELG compatible with 3.3 V logic systems?

No, MC74ACT08MELG is not compatible with 3.3 V logic systems. Its recommended operating supply is strictly 4.5 V to 5.5 V, and its TTL-compatible inputs are specified only within that range. Applying 3.3 V to VCC violates the minimum supply rating and will result in undefined operation or failure to meet VOH/VOL specifications.

What is the maximum capacitive load MC74ACT08MELG can drive while maintaining specified propagation delay?

The MC74ACT08MELG is characterized for CL = 50 pF, with max tPLH/tPHL = 9.0 ns at VCC = 5.0 V and TA = −40°C to +85°C. Driving loads significantly above 50 pF increases propagation delay nonlinearly and may cause waveform degradation; for >50 pF loads, buffer staging or impedance-matched transmission line design is recommended to maintain timing integrity.

Does MC74ACT08MELG support hot-swap or live-insertion operation?

No, MC74ACT08MELG does not support hot-swap or live-insertion. Its absolute maximum ratings specify that VCC must be applied before any input signals, and simultaneous application of inputs and VCC may cause latch-up or parametric shift. Power sequencing per manufacturer guidelines is required for reliable operation in modular backplane systems.

What is the thermal resistance (θJA) of the SOEIAJ-14 package used by MC74ACT08MELG?

The SOEIAJ-14 package (Case 965) used by MC74ACT08MELG has a typical junction-to-ambient thermal resistance (θJA) of 130°C/W under standard JEDEC 2-layer board conditions. This value assumes 1 in² copper pad with 2 oz copper and 1 via per lead; actual θJA improves with enhanced PCB copper area and thermal vias beneath the exposed pad region.

MC74ACT08MELG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Circuits:: -

Number of Inputs:: -

Features:: -

Voltage - Supply:: -

Current - Quiescent (Max):: -

Current - Output High, Low:: -

Input Logic Level - Low:: -

Input Logic Level - High:: -

Max Propagation Delay @ V, Max CL:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

MC74ACT08MELG FAQ

1.How can I place an order for MC74ACT08MELG through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74ACT08MELG 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 MC74ACT08MELG reliable?

The price and inventory of MC74ACT08MELG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT08MELG is usually 5 days.

3.What payment methods are accepted for MC74ACT08MELG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT08MELG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74ACT08MELG?

MC74ACT08MELG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74ACT08MELG 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 MC74ACT08MELG?

For technical support, including MC74ACT08MELG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT08MELG requirements.

6.How does Aetrix verify that MC74ACT08MELG is sourced from the original manufacturer or authorized distributors?

All MC74ACT08MELG 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 MC74ACT08MELG meets industry standards.

7.What is the process for return or replacement of MC74ACT08MELG?

All MC74ACT08MELG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT08MELG, 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 MC74ACT08MELG part is unused and in its original packaging.

Return procedure for MC74ACT08MELG:

1.Submit a request within 90 days.

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

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