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

onsemi MC74ACT08DT

Name: MC74ACT08DT
Brand: onsemi
SKU: MC74ACT08DT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74ACT08DT

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: -

Datasheet:: MC74ACT08DT.pdf

Description:: IC GATE AND

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Product details

Overview

MC74ACT08DT from ON Semiconductor 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, and achieves typical propagation delays of 5.5 ns (tPLH/tPHL) at CL = 50 pF - used in bus gating, address decoding, and control signal conditioning.

For engineers reviewing the MC74ACT08DT datasheet, pinout, applications, or equivalent options, key selection criteria include its 5 V-only operation, TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), guaranteed 24 mA sink/source capability, and TSSOP-14 package compatibility with space-constrained PCB layouts.

Technical Context

The MC74ACT08DT implements four independent AND gates in a single monolithic CMOS structure with buffered TTL-compatible input stages. Its input thresholds are fixed at VIH ≥ 2.0 V and VIL ≤ 0.8 V under 4.5–5.5 V VCC, ensuring reliable interfacing with legacy TTL outputs without level shifting.

Each gate features symmetrical output drive (IOH = −24 mA, IOL = 24 mA at VOH ≥ 3.76 V / VOL ≤ 0.44 V), operates across −40 °C to +85 °C ambient, and exhibits low dynamic power dissipation (CPD = 20 pF) with quiescent ICC ≤ 40 µA at VCC = 5.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Quad 2-input AND gate - enables parallel Boolean conjunction of four independent signal pairs
Supply Voltage Range	4.5 V to 5.5 V - requires regulated 5 V rail; not compatible with 3.3 V or mixed-voltage domains
Input Compatibility	TTL-compatible - accepts standard TTL output levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V) directly
Output Drive	±24 mA per output - sufficient to drive multiple 74-series inputs or small capacitive loads (< 50 pF)
Propagation Delay	Max 10.0 ns at VCC = 5.0 V, CL = 50 pF - supports >50 MHz toggle rates in clean load conditions
Operating Temperature	−40 °C to +85 °C - qualified for industrial-grade embedded control and instrumentation
Input Capacitance	4.5 pF - minimizes loading on upstream drivers and preserves signal edge integrity

Pinout & Package

TSSOP-14 package (Case 948G), 4.4 mm × 5.0 mm footprint, 0.65 mm lead pitch, thin-profile surface-mount construction optimized for automated assembly and thermal performance in dense layouts.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 8, 9, 11, 12	Input A/B per gate	Eight total inputs - two per AND gate (Gate 1: Pins 1&2; Gate 2: 4&5; Gate 3: 8&9; Gate 4: 11&12)
3, 6, 10, 13	Output Y per gate	Four independent gate outputs - routed to downstream logic, enable lines, or status indicators
7	GND	Ground reference for all inputs/outputs and internal biasing - must be low-impedance connection
14	VCC	Positive supply terminal - requires local 100 nF ceramic decoupling adjacent to pin

Key Features

Feature	Design Value
TTL-compatible input thresholds	VIH ≥ 2.0 V / VIL ≤ 0.8 V at VCC = 4.5–5.5 V - eliminates need for external level translators when interfacing with 74LS/74F families
High-output current drive	24 mA sink/source per output - supports fan-out of ≥10 74ACT inputs or direct LED driving with series resistor
Low propagation delay variation	Max tPLH/tPHL = 10.0 ns over full temperature and voltage range - ensures timing predictability in synchronous control paths
Pb-free TSSOP-14 packaging	RoHS-compliant, halogen-free construction - meets IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1)
Wide operating ambient range	−40 °C to +85 °C - validated for use in industrial PLCs, motor drives, and outdoor communication equipment

Applications

Industrial Control Logic	Microcontroller Peripheral Gating
Use Scenario: Enabling/disabling sensor data acquisition channels based on system mode or fault status in programmable logic controllers. IC Role / Device Role / Timing Role: Quad AND gate performing real-time signal enable masking - each gate controls one analog front-end channel's data path. Use Value: Ensures deterministic gating with <10 ns delay skew between channels, preventing metastability in sampled data streams.	Use Scenario: Selectively enabling UART, SPI, or GPIO peripherals on an MCU during boot or low-power states to reduce active current draw. IC Role / Device Role / Timing Role: Logic-level AND gate combining MCU output enable signals with system-wide power-good status. Use Value: Delivers 24 mA drive to sustain peripheral reset lines or clock enables without external buffers, simplifying BOM.
Address Decoding	Bus Arbitration Interface
Use Scenario: Generating chip-select signals for memory-mapped peripherals (e.g., ADCs, DACs, EEPROMs) in 8-bit microprocessor systems. IC Role / Device Role / Timing Role: Combining address bus bits and control strobes (e.g., RD#, WR#) to generate precise decode windows. Use Value: Guarantees sub-10 ns setup/hold margins relative to CPU address valid windows, eliminating decode glitches.	Use Scenario: Resolving bus contention between multiple masters (e.g., MCU + FPGA) by AND-ing grant and request signals in shared resource arbitration. IC Role / Device Role / Timing Role: Synchronizing distributed bus access requests using combinatorial logic with minimal propagation uncertainty. Use Value: Provides deterministic priority resolution with matched delay paths across all four gates, reducing arbitration jitter.

Industrial Control Logic

Microcontroller Peripheral Gating

Use Scenario: Enabling/disabling sensor data acquisition channels based on system mode or fault status in programmable logic controllers.

IC Role / Device Role / Timing Role: Quad AND gate performing real-time signal enable masking - each gate controls one analog front-end channel's data path.

Use Value: Ensures deterministic gating with <10 ns delay skew between channels, preventing metastability in sampled data streams.

Use Scenario: Selectively enabling UART, SPI, or GPIO peripherals on an MCU during boot or low-power states to reduce active current draw.

IC Role / Device Role / Timing Role: Logic-level AND gate combining MCU output enable signals with system-wide power-good status.

Use Value: Delivers 24 mA drive to sustain peripheral reset lines or clock enables without external buffers, simplifying BOM.

Address Decoding

Bus Arbitration Interface

Use Scenario: Generating chip-select signals for memory-mapped peripherals (e.g., ADCs, DACs, EEPROMs) in 8-bit microprocessor systems.

IC Role / Device Role / Timing Role: Combining address bus bits and control strobes (e.g., RD#, WR#) to generate precise decode windows.

Use Value: Guarantees sub-10 ns setup/hold margins relative to CPU address valid windows, eliminating decode glitches.

Use Scenario: Resolving bus contention between multiple masters (e.g., MCU + FPGA) by AND-ing grant and request signals in shared resource arbitration.

IC Role / Device Role / Timing Role: Synchronizing distributed bus access requests using combinatorial logic with minimal propagation uncertainty.

Use Value: Provides deterministic priority resolution with matched delay paths across all four gates, reducing arbitration jitter.

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
SN74ACT08DR	Same logic function, identical DC/AC specs, SOIC-14 package (wider 3.9 mm body vs. TSSOP-14's 4.4 mm × 5.0 mm)	Requires PCB layout change due to different footprint and lead pitch (1.27 mm vs. 0.65 mm); no reflow profile adjustment needed	Select when board space allows larger SOIC and hand-soldering or legacy assembly lines are used.
74VHC08M	CMOS-only inputs (VIH = 3.35 V min at VCC = 5 V), lower ICC (2 µA typ), but only 8 mA output drive	Cannot interface directly with TTL outputs; insufficient drive for multi-load fan-out or LED indication without buffering	Choose only for ultra-low-power 5 V systems where input compatibility and drive strength are secondary to static current.

Compared with SN74ACT08DR and 74VHC08M, the MC74ACT08DT uniquely combines TTL input compatibility, 24 mA drive, and compact TSSOP-14 packaging - making it optimal for space-constrained industrial controllers requiring robust legacy interface support.

Availability

MC74ACT08DT is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral gating, address decoding, and bus arbitration applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for MC74ACT08DT 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

ON Semiconductor (now onsemi) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and discrete devices for automotive, industrial, cloud computing, and IoT markets.

The MC74ACT08DT belongs to the 74ACT logic family - engineered for high-speed, TTL-compatible 5 V digital systems where noise immunity, output drive, and timing consistency outweigh ultra-low-power requirements.

FAQ

What logic family does the MC74ACT08DT belong to, and how does it differ from standard 74AC devices?

The MC74ACT08DT belongs to the 74ACT logic family, distinguished by TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) versus the higher CMOS thresholds of 74AC (VIH ≥ 3.15 V at VCC = 4.5 V). This allows direct interfacing with legacy TTL outputs without level shifters - a key feature confirmed in the device's DC characteristics table. The MC74ACT08DT maintains identical output drive (±24 mA) and timing (10 ns max delay) as its 74AC counterpart but operates strictly within 4.5–5.5 V.

Can the MC74ACT08DT operate at 3.3 V supply voltage?

No, the MC74ACT08DT cannot operate reliably at 3.3 V. Its recommended operating conditions specify VCC = 4.5 V to 5.5 V only, and its TTL-compatible inputs require minimum VIH = 2.0 V - which falls outside safe margin at 3.3 V. Attempting 3.3 V operation risks undefined logic states and violates the Absolute Maximum Ratings table, where VCC < 4.5 V is not characterized. For 3.3 V systems, consider 74LVC08 or 74AUP08 alternatives instead of the MC74ACT08DT.

What is the maximum capacitive load the MC74ACT08DT can drive while maintaining specified propagation delay?

The MC74ACT08DT's AC characteristics are specified at CL = 50 pF, with max tPLH/tPHL = 10.0 ns at VCC = 5.0 V and TA = −40 °C to +85 °C. Driving loads beyond 50 pF increases delay nonlinearly - e.g., at 100 pF, delay may exceed 15 ns based on CPD = 20 pF and typical driver impedance. To maintain timing compliance, keep net capacitance ≤50 pF via controlled trace length, minimized stubs, and avoidance of unterminated buses. The MC74ACT08DT itself does not include slew-rate control or output impedance tuning.

Is the MC74ACT08DT pin-compatible with the MC74AC08DT?

No, the MC74ACT08DT is not pin-compatible with the MC74AC08DT in functional terms despite identical pinout and package (TSSOP-14). Their input voltage thresholds differ fundamentally: MC74ACT08DT requires VIH ≥ 2.0 V (TTL-compatible), while MC74AC08DT requires VIH ≥ 3.15 V (CMOS-compatible) at VCC = 4.5 V. Swapping them risks logic misreads if driven by TTL sources. Both share the same physical pin mapping, but electrical behavior is incompatible - the MC74ACT08DT must be selected specifically for TTL interface scenarios.

Does the MC74ACT08DT support hot-swap or live-insertion into powered systems?

No, the MC74ACT08DT does not support hot-swap operation. Its Absolute Maximum Ratings specify that DC input voltage must remain within −0.5 V to VCC +0.5 V - violating this (e.g., applying input signals before VCC ramps) risks latch-up or permanent damage. The device lacks power-on reset circuitry, bus-hold, or Ioff protection. For hot-swap applications, use dedicated hot-swap controllers or logic families with Ioff (e.g., 74LVCxx) instead of the MC74ACT08DT.

MC74ACT08DT 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:: -

MC74ACT08DT FAQ

1.How can I place an order for MC74ACT08DT through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74ACT08DT 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 MC74ACT08DT reliable?

The price and inventory of MC74ACT08DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT08DT is usually 5 days.

3.What payment methods are accepted for MC74ACT08DT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT08DT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74ACT08DT?

MC74ACT08DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74ACT08DT 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 MC74ACT08DT?

For technical support, including MC74ACT08DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT08DT requirements.

6.How does Aetrix verify that MC74ACT08DT is sourced from the original manufacturer or authorized distributors?

All MC74ACT08DT 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 MC74ACT08DT meets industry standards.

7.What is the process for return or replacement of MC74ACT08DT?

All MC74ACT08DT units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT08DT, 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 MC74ACT08DT part is unused and in its original packaging.

Return procedure for MC74ACT08DT:

1.Submit a request within 90 days.

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

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