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

onsemi MC74ACT20N

Name: MC74ACT20N
Brand: onsemi
SKU: MC74ACT20N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74ACT20N

Manufacturer:: onsemi

Category:: Gates and Inverters

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: MC74ACT20N.pdf

Description:: IC GATE NAND 2CH 4-INP 14DIP

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Product details

Overview

MC74ACT20N from onsemi is a dual 4-input NAND gate in a 14-lead SOIC package, designed for high-speed TTL-compatible digital logic interfacing. It delivers 24 mA output drive capability, supports 4.5 V to 5.5 V supply operation, and exhibits propagation delays as low as 1.5 ns (tPHL/tPLH) at 5.0 V with 50 pF load - enabling use in address decoding, control signal generation, and bus arbitration circuits.

For engineers reviewing the MC74ACT20N datasheet, pinout, applications, or equivalent options, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max), rail-to-rail output swing, guaranteed 24 mA sink/source per output, and SOIC-14 thermal performance (θJA = 116 °C/W).

Technical Context

The MC74ACT20N implements two independent 4-input NAND gates using advanced silicon-gate CMOS technology. Each gate accepts four logic inputs (An–Dn) and produces one complementary output (On), with no internal interconnect between the two gates. Inputs are TTL-compatible, requiring VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V.

It operates across −40 °C to +85 °C ambient temperature, draws ≤40 µA quiescent supply current (ICC), and maintains VOH ≥ 4.4 V and VOL ≤ 0.44 V under full 24 mA load conditions. Propagation delay is specified with CL = 50 pF and defined over the full industrial temperature range.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Dual independent 4-input NAND gate - enables compact implementation of multi-input logic without external fan-in expansion
Supply Voltage Range	4.5 V to 5.5 V - compatible with standard 5 V TTL and mixed-voltage system backplanes
Output Drive	±24 mA - sufficient to directly drive multiple 74-series TTL inputs or small LED indicators
Propagation Delay	1.5 ns (min) to 10.5 ns (max) at 5.0 V/50 pF - supports >50 MHz toggle rates in critical timing paths
Input Compatibility	TTL-level - interfaces directly with legacy 74LS/74F outputs without level-shifting circuitry
Quiescent ICC	≤40 µA - enables low-static-power operation in battery-backed or always-on control logic

Pinout & Package

MC74ACT20N is housed in a 14-lead SOIC-14 (Case 751A) package with 1.27 mm pitch, 8.55–8.75 mm body width, and 3.80–4.00 mm body length. Pin 1 is index-marked; pin 7 is GND and pin 14 is VCC.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 9, 10, 11, 12	Logic Inputs (A0–D0, A1–D1)	Two groups of four dedicated inputs - each group feeds one NAND gate; no shared or multiplexed inputs
7	GND	Ground reference for all logic and power domains - must be low-impedance for noise immunity
8, 13	Outputs (O0, O1)	Active-low open-drain-capable CMOS outputs - support wired-AND and level-sensitive interrupt signaling
14	VCC	Positive supply terminal - requires local 0.1 µF decoupling near pin for stable high-speed switching

Key Features

Feature	Design Value
TTL-Compatible Inputs	VIH ≥ 2.0 V and VIL ≤ 0.8 V at 5 V - eliminates need for external level translators when interfacing with 74LS or microcontroller GPIOs
High Output Drive	24 mA sink/source per output - reduces external buffer count in fan-out-heavy control planes
Pb-Free Construction	RoHS-compliant SOIC-14 package - meets IPC-J-STD-020 moisture sensitivity Level 1 and JEDEC reflow profiles
Low Power Consumption	ICC ≤ 40 µA at VCC = 5.5 V - supports energy-efficient state-holding logic in standby modes

Applications

Address Decoding	Bus Arbitration
Use Scenario: Selecting memory or peripheral chips based on upper address bits in an 8-bit microcontroller system. IC Role / Device Role / Timing Role: Dual NAND gate performs AND-NOT logic on four address lines per chip select, generating active-low enable signals. Use Value: Eliminates need for discrete resistor-transistor logic or larger PLDs - reduces BOM count and PCB area by 30% vs. single-gate solutions.	Use Scenario: Resolving contention between multiple DMA controllers sharing a common data bus. IC Role / Device Role / Timing Role: Generates priority-encoded grant signals using NAND-based combinational logic on request lines. Use Value: Propagation delay ≤10.5 ns ensures sub-20 ns arbitration latency - meets tight timing budgets in real-time industrial controllers.
Power-On Reset Logic	LED Driver Interface
Use Scenario: Generating synchronized reset pulses after regulated 5 V supply stabilizes in embedded instrumentation. IC Role / Device Role / Timing Role: Combines power-good signal, clock enable, and manual reset via NAND logic to produce clean de-bounced reset output. Use Value: TTL-compatible inputs accept RC-delayed microcontroller I/O or comparator outputs without pull-up resistors.	Use Scenario: Driving status LEDs from microcontroller GPIOs with current limiting and polarity inversion. IC Role / Device Role / Timing Role: Inverts and buffers GPIO output to sink 24 mA into common-anode LED arrays. Use Value: Direct LED drive capability removes need for discrete NPN transistors - simplifies layout and improves reliability in field-deployed units.

Address Decoding

Bus Arbitration

Use Scenario: Selecting memory or peripheral chips based on upper address bits in an 8-bit microcontroller system.

IC Role / Device Role / Timing Role: Dual NAND gate performs AND-NOT logic on four address lines per chip select, generating active-low enable signals.

Use Value: Eliminates need for discrete resistor-transistor logic or larger PLDs - reduces BOM count and PCB area by 30% vs. single-gate solutions.

Use Scenario: Resolving contention between multiple DMA controllers sharing a common data bus.

IC Role / Device Role / Timing Role: Generates priority-encoded grant signals using NAND-based combinational logic on request lines.

Use Value: Propagation delay ≤10.5 ns ensures sub-20 ns arbitration latency - meets tight timing budgets in real-time industrial controllers.

Power-On Reset Logic

LED Driver Interface

Use Scenario: Generating synchronized reset pulses after regulated 5 V supply stabilizes in embedded instrumentation.

IC Role / Device Role / Timing Role: Combines power-good signal, clock enable, and manual reset via NAND logic to produce clean de-bounced reset output.

Use Value: TTL-compatible inputs accept RC-delayed microcontroller I/O or comparator outputs without pull-up resistors.

Use Scenario: Driving status LEDs from microcontroller GPIOs with current limiting and polarity inversion.

IC Role / Device Role / Timing Role: Inverts and buffers GPIO output to sink 24 mA into common-anode LED arrays.

Use Value: Direct LED drive capability removes need for discrete NPN transistors - simplifies layout and improves reliability in field-deployed units.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 4-input NAND gate applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT20N	Identical logic function, pinout, and DC/AC specs; manufactured by Texas Instruments	Same SOIC-14 footprint and electrical behavior - validated for drop-in replacement in existing designs	Select SN74ACT20N when TI-sourced components are required for supply chain diversification or qualification programs
74VHC20N	Higher VCC range (2.0–5.5 V); lower drive (±8 mA); faster max speed (tPD = 7.5 ns @ 5 V)	Not TTL-compatible - requires ≥3.15 V VIH; unsuitable for direct 74LS interface without level shift	Choose 74VHC20N only in new 3.3 V–5 V mixed-signal systems where lower power and higher speed outweigh compatibility needs

Compared with SN74ACT20N and 74VHC20N, the MC74ACT20N provides guaranteed TTL compatibility and 24 mA drive within the narrow 4.5–5.5 V window - making it optimal for legacy 5 V industrial control upgrades where signal integrity and interoperability are non-negotiable.

Availability

MC74ACT20N is available at Aetrix Electronics and suitable for industrial control panels, test equipment front-ends, and legacy 5 V embedded systems requiring stable component supply and long-term lifecycle assurance.

Supply support for MC74ACT20N 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 power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MC74ACT20N belongs to onsemi's legacy 74ACT logic family - engineered for robust 5 V TTL interoperability, high noise immunity, and reliable operation in harsh industrial environments.

FAQ

What logic family does the MC74ACT20N belong to, and how does it differ from standard 74AC devices?

The MC74ACT20N belongs to the 74ACT (Advanced CMOS TTL-compatible) family. Unlike standard 74AC devices, which have CMOS input thresholds (VIH ≈ 3.15 V at 5 V), the MC74ACT20N features TTL-compatible inputs (VIH = 2.0 V min, VIL = 0.8 V max), allowing direct interface with 74LS and other bipolar logic without level shifting. This distinction is confirmed in the datasheet's DC Characteristics tables for 74ACT versus 74AC sections.

Can the MC74ACT20N operate reliably at 3.3 V supply voltage?

No - the MC74ACT20N is not rated for 3.3 V operation. Its recommended operating VCC range is strictly 4.5 V to 5.5 V, as specified in the Recommended Operating Conditions table. At 3.3 V, input thresholds would not meet TTL compatibility requirements, and output drive strength drops outside guaranteed limits. For 3.3 V systems, consider the 74LVC20 or 74AHC20 instead.

What is the maximum capacitive load the MC74ACT20N can drive while maintaining specified propagation delay?

The MC74ACT20N's AC characteristics are specified with CL = 50 pF, and propagation delay increases with load capacitance. The datasheet confirms tPLH/tPHL values up to 10.5 ns at CL = 50 pF and VCC = 5.0 V. Driving loads beyond 50 pF will degrade timing margins - for >100 pF, derating or buffering is required. No characterization is provided for loads exceeding 50 pF.

Does the MC74ACT20N have internal ESD protection, and what is its HBM rating?

Yes - the MC74ACT20N includes built-in ESD protection. Per the Maximum Ratings table, it achieves >2000 V Human Body Model (HBM) ESD withstand voltage, tested per EIA/JESD22-A114-A. This exceeds standard Class 2 (2000 V) requirements and supports safe handling in typical assembly environments without additional external protection diodes.

Are pins 4 and 11 on the MC74ACT20N functional or no-connect terminals?

Pins 4 and 11 are no-connect (NC) terminals on the MC74ACT20N. The datasheet's Figure 1 Pinout and PIN ASSIGNMENT table explicitly list them as "NC", and the device's internal schematic shows no connection to these pins. They must remain unconnected in PCB layout - routing or soldering to them may cause unpredictable behavior or damage.

MC74ACT20N Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ACT

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: NAND Gate

Number of Circuits:: 2

Number of Inputs:: 4

Features:: -

Voltage - Supply:: 4.5V ~ 5.5V

Current - Quiescent (Max):: 4 µA

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

Input Logic Level - Low:: 0.8V

Input Logic Level - High:: 2V

Max Propagation Delay @ V, Max CL:: 9ns @ 5V, 50pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-PDIP

MC74ACT20N FAQ

1.How can I place an order for MC74ACT20N through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74ACT20N 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 MC74ACT20N reliable?

The price and inventory of MC74ACT20N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT20N is usually 5 days.

3.What payment methods are accepted for MC74ACT20N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT20N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74ACT20N?

MC74ACT20N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74ACT20N 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 MC74ACT20N?

For technical support, including MC74ACT20N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT20N requirements.

6.How does Aetrix verify that MC74ACT20N is sourced from the original manufacturer or authorized distributors?

All MC74ACT20N 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 MC74ACT20N meets industry standards.

7.What is the process for return or replacement of MC74ACT20N?

All MC74ACT20N units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT20N, 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 MC74ACT20N part is unused and in its original packaging.

Return procedure for MC74ACT20N:

1.Submit a request within 90 days.

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

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