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

onsemi MC74AC08DT

Name: MC74AC08DT
Brand: onsemi
SKU: MC74AC08DT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74AC08DT

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: -

Datasheet:: MC74AC08DT.pdf

Description:: IC GATE AND

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Product details

Overview

MC74AC08DT from onsemi is a quad 2-input AND gate logic IC in TSSOP-14 package, operating at 2.0–6.0 V supply, delivering ±24 mA output drive, with propagation delays as low as 5.5 ns at 5.0 V and 50 pF load, used in digital control signal conditioning and bus gating applications.

For engineers reviewing the MC74AC08DT datasheet, pinout, applications, or equivalent options, this device serves as a high-speed, low-power CMOS logic gate for level-sensitive combinational logic in industrial control panels, embedded interface modules, and power management sequencing circuits.

Technical Context

The MC74AC08DT implements four independent AND gates using advanced AC CMOS technology, supporting rail-to-rail input voltage range (–0.5 V to V_CC + 0.5 V) and guaranteed TTL-compatible output swing across its full operating temperature range (–40 °C to +85 °C). It features symmetrical output drive capability (±24 mA) and low quiescent ICC (≤40 µA at V_CC = 5.5 V).

Unlike the MC74ACT08 variant, the MC74AC08DT uses CMOS-compatible input thresholds (VIH = 2.1 V min at V_CC = 3.0 V), enabling direct interfacing with 3.3 V and 5 V logic families without level translation. Its AC characteristics are specified at CL = 50 pF, with t_PLH/t_PHL ≤ 8.5 ns (max) at 5.0 V, ensuring predictable timing in synchronous digital subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	74AC - high-speed CMOS with TTL-compatible outputs and wide V_CC range (2.0–6.0 V)
Supply Voltage Range	2.0 V to 6.0 V - supports mixed-voltage system integration including 3.3 V and 5 V domains
Output Drive	±24 mA per output - sufficient to directly drive LEDs, small MOSFET gates, or fan-out to ≥10 LS-TTL loads
Propagation Delay	5.5 ns (typ) / 8.5 ns (max) at V_CC = 5.0 V, CL = 50 pF - enables reliable operation up to ~100 MHz toggle rate in simple combinatorial paths
Input Thresholds	VIH = 2.1 V min (V_CC = 3.0 V); VIL = 0.9 V max - ensures noise margin >0.4 V under nominal 3.3 V operation
Operating Temperature	–40 °C to +85 °C - qualified for industrial-grade ambient environments without derating
Power Dissipation Cap.	CPD = 20 pF - enables accurate dynamic power estimation (P_dyn ≈ CPD × V_CC² × f) for thermal design

Pinout & Package

TSSOP-14 (DT suffix, Case 948G), 4.9 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, moisture sensitivity level MSL3.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 4, 5, 8, 9, 12, 13	Input A/B of AND gates	Eight total inputs across four gates; each pair (e.g., pins 1&2 → output pin 3) forms one AND function
3, 6, 10, 11	AND Output Y	Four buffered gate outputs; each capable of sourcing/sinking ±24 mA with rail-aligned VOH/VOL
7	GND	Ground reference for all inputs, outputs, and internal circuitry; must be low-impedance connection
14	V_CC	Positive supply rail; bypassing with 0.1 µF ceramic capacitor near pin recommended for noise immunity

Key Features

Feature	Design Value
High-Speed Performance	t_PD ≤ 8.5 ns at 5 V - enables use in clock distribution, enable gating, and address decoding with sub-10 ns timing margins
Wide Supply Range	2.0 V to 6.0 V operation - eliminates need for separate voltage regulators when interfacing with diverse logic families
Low Static Power	I_CC ≤ 40 µA at 5.5 V - reduces standby current in battery-backed or energy-constrained systems
Robust Input/Output Protection	±20 mA input current rating and ±50 mA output current limit - withstands transient overdrive and ESD events per IEC 61000-4-2 Level 2
CMOS Input Compatibility	VIH/VIL thresholds track V_CC - ensures reliable logic recognition across 3.3 V and 5 V interfaces without external biasing

Applications

Industrial PLC I/O Conditioning	Embedded Microcontroller Bus Gating
Use Scenario: Isolating and enabling discrete sensor inputs before feeding into a microcontroller's GPIO port in a programmable logic controller cabinet. IC Role / Device Role / Timing Role: Quad AND gate performing active-high enable gating on four independent 24 V DC sensor signals converted to 5 V logic levels. Use Value: Eliminates need for discrete transistor buffers; single MC74AC08DT replaces four discrete gates while maintaining <10 ns propagation delay for real-time response.	Use Scenario: Controlling access to shared peripheral buses (e.g., SPI or UART lines) between multiple MCU cores in a dual-core safety monitor. IC Role / Device Role / Timing Role: Bus arbitration gate that enables only one core's transmit path based on priority-encoded control signals. Use Value: Ensures no bus contention via hardware-level AND logic with deterministic 8.5 ns max delay, avoiding software-based arbitration latency.
Power Sequencing Control	LED Driver Enable Logic
Use Scenario: Generating synchronized enable signals for three DC/DC converters in a multi-rail FPGA power supply, requiring precise turn-on order. IC Role / Device Role / Timing Role: Combinatorial logic element combining reset status and voltage-good flags to generate sequenced EN signals. Use Value: Provides glitch-free, monotonic enable edges with <100 ps skew between outputs due to matched internal routing in monolithic die.	Use Scenario: Driving eight indicator LEDs in a medical device front panel where brightness is controlled by PWM but on/off state depends on system mode. IC Role / Device Role / Timing Role: Final-stage AND gate combining PWM signal (pin 1) and system-enable signal (pin 2) to gate LED current path. Use Value: Allows independent dimming and safety shutdown; ±24 mA output drive directly sinks common-cathode LED anodes without external transistors.

Industrial PLC I/O Conditioning

Embedded Microcontroller Bus Gating

Use Scenario: Isolating and enabling discrete sensor inputs before feeding into a microcontroller's GPIO port in a programmable logic controller cabinet.

IC Role / Device Role / Timing Role: Quad AND gate performing active-high enable gating on four independent 24 V DC sensor signals converted to 5 V logic levels.

Use Value: Eliminates need for discrete transistor buffers; single MC74AC08DT replaces four discrete gates while maintaining <10 ns propagation delay for real-time response.

Use Scenario: Controlling access to shared peripheral buses (e.g., SPI or UART lines) between multiple MCU cores in a dual-core safety monitor.

IC Role / Device Role / Timing Role: Bus arbitration gate that enables only one core's transmit path based on priority-encoded control signals.

Use Value: Ensures no bus contention via hardware-level AND logic with deterministic 8.5 ns max delay, avoiding software-based arbitration latency.

Power Sequencing Control

LED Driver Enable Logic

Use Scenario: Generating synchronized enable signals for three DC/DC converters in a multi-rail FPGA power supply, requiring precise turn-on order.

IC Role / Device Role / Timing Role: Combinatorial logic element combining reset status and voltage-good flags to generate sequenced EN signals.

Use Value: Provides glitch-free, monotonic enable edges with <100 ps skew between outputs due to matched internal routing in monolithic die.

Use Scenario: Driving eight indicator LEDs in a medical device front panel where brightness is controlled by PWM but on/off state depends on system mode.

IC Role / Device Role / Timing Role: Final-stage AND gate combining PWM signal (pin 1) and system-enable signal (pin 2) to gate LED current path.

Use Value: Allows independent dimming and safety shutdown; ±24 mA output drive directly sinks common-cathode LED anodes without external transistors.

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
SN74AC08PW	TSSOP-14, identical AC/DC specs, TI-marked; VIH/VIL thresholds match MC74AC08DT within 50 mV at 5 V	No functional difference; pinout and timing fully aligned; validated for same industrial temperature range	Drop-in alternative if dual-sourcing or TI-centric BOM policy applies; same footprint and thermal profile
74LVC08AD,118	3.3 V only (1.65–3.6 V), lower V_CC max, 24 mA drive, 3.8 ns typical t_PD; higher speed but narrower supply range	Not suitable for 5 V systems; requires level shifters when interfacing with 5 V peripherals or legacy controllers	Select when operating exclusively in 3.3 V domain and sub-4 ns delay is required; verify V_IN compatibility with upstream drivers

Compared with SN74AC08PW, MC74AC08DT offers identical performance and drop-in compatibility; versus 74LVC08AD,118, MC74AC08DT provides broader supply flexibility (2–6 V vs. 1.65–3.6 V) at modest speed trade-off, making it preferable for mixed-voltage industrial designs.

Availability

MC74AC08DT is available at Aetrix Electronics and suitable for industrial control panels, embedded microcontroller interface modules, and power sequencing circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74AC08DT 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, and IoT applications.

The MC74AC08DT belongs to the 74AC logic family, designed for high-speed, low-power digital signal routing in industrial automation, instrumentation, and embedded control systems where reliability across wide voltage and temperature ranges is critical.

FAQ

What is the maximum supply voltage rating for MC74AC08DT?

The MC74AC08DT has an absolute maximum DC supply voltage (V_CC) rating of +7.0 V, but recommended operation is limited to 2.0 V to 6.0 V per the datasheet's Recommended Operating Conditions table. Sustained operation above 6.0 V risks parametric degradation or permanent damage, even if within the absolute maximum rating.

Does MC74AC08DT support 3.3 V logic interfacing without level shifters?

Yes, MC74AC08DT supports direct 3.3 V logic interfacing: its input thresholds (VIH = 2.1 V min at V_CC = 3.0 V) and output swing (VOH ≥ 2.9 V at V_CC = 3.0 V) meet 3.3 V LVTTL and LVCMOS requirements. No level shifter is needed when V_CC = 3.3 V and driving/receiving compatible 3.3 V devices.

What is the thermal resistance (θ_JA) of MC74AC08DT in TSSOP-14 package?

The MC74AC08DT datasheet does not specify θ_JA for the TSSOP-14 (DT) package. However, industry-standard JEDEC JESD51-2A data for Case 948G yields θ_JA ≈ 140 °C/W on 1-inch² 2-layer board with 1 oz copper. For precise thermal design, refer to onsemi's AN1027 application note or perform board-specific simulation.

Can MC74AC08DT drive a 50 pF capacitive load with guaranteed timing?

Yes - MC74AC08DT AC specifications are explicitly characterized at CL = 50 pF, with t_PLH/t_PHL guaranteed ≤ 8.5 ns (max) at V_CC = 5.0 V. This confirms full timing compliance for standard PCB traces, connectors, and input capacitance of downstream logic devices totaling ≤50 pF.

Is MC74AC08DT pin-compatible with MC74ACT08DT?

Yes, MC74AC08DT and MC74ACT08DT share identical TSSOP-14 pinout and package dimensions (Case 948G), but differ electrically: MC74ACT08DT has TTL-compatible inputs (VIH = 2.0 V fixed), while MC74AC08DT uses CMOS-ratio inputs (VIH ∝ V_CC). Swapping requires verifying input source compatibility.

MC74AC08DT 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:: -

MC74AC08DT FAQ

1.How can I place an order for MC74AC08DT through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74AC08DT 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 MC74AC08DT reliable?

The price and inventory of MC74AC08DT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC08DT is usually 5 days.

3.What payment methods are accepted for MC74AC08DT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC08DT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74AC08DT?

MC74AC08DT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74AC08DT 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 MC74AC08DT?

For technical support, including MC74AC08DT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC08DT requirements.

6.How does Aetrix verify that MC74AC08DT is sourced from the original manufacturer or authorized distributors?

All MC74AC08DT 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 MC74AC08DT meets industry standards.

7.What is the process for return or replacement of MC74AC08DT?

All MC74AC08DT units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC08DT, 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 MC74AC08DT part is unused and in its original packaging.

Return procedure for MC74AC08DT:

1.Submit a request within 90 days.

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

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