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

onsemi MC74ACT14NG

Name: MC74ACT14NG
Brand: onsemi
SKU: MC74ACT14NG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74ACT14NG

Manufacturer:: onsemi

Category:: Gates and Inverters

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

Datasheet:: MC74ACT14NG.pdf

Description:: IC INVERT SCHMITT 6CH 1IN 14DIP

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Product details

Overview

MC74ACT14NG from onsemi is a hex Schmitt-trigger inverter IC with TTL-compatible inputs, designed for noise-immune signal conditioning in digital logic interfaces. It provides six independent inverters with 24 mA output drive capability, 1.2 V typical hysteresis at 5 V supply, and operates across −40°C to +85°C ambient temperature - commonly used in clock shaping, debouncing mechanical switches, and interfacing noisy sensor signals in industrial control systems.

For engineers reviewing the MC74ACT14NG datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options for robust design-in decisions.

Technical Context

The MC74ACT14NG implements six independent Schmitt-trigger input inverters using high-performance silicon-gate CMOS technology. Each channel features internally set hysteresis (1.2 V min at V_CC = 5.5 V), enabling clean edge regeneration from slow or noisy input waveforms without external components.

It accepts TTL-level inputs (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) while delivering full CMOS output swing (V_OH ≥ 4.4 V, VOL ≤ 0.44 V at I_OL/I_OH = ±24 mA), ensuring interoperability between TTL and CMOS logic families in mixed-signal systems.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Hex inverting Schmitt trigger - enables reliable waveform shaping and noise rejection in signal conditioning paths
Input Compatibility	TTL-level inputs (V_IH ≥ 2.0 V, V_IL ≤ 0.8 V) - allows direct connection to legacy 5 V TTL outputs without level-shifting
Hysteresis	1.2 V minimum at V_CC = 5.5 V - ensures stable switching thresholds insensitive to supply/temperature drift
Output Drive	±24 mA per output - supports driving multiple standard CMOS loads or moderate capacitive traces
Propagation Delay	10.0 ns max (t_PHL/t_PLH, V_CC = 5.0 V, C_L = 50 pF) - suitable for medium-speed digital interface cleanup up to ~50 MHz
Supply Voltage Range	4.5 V to 5.5 V - optimized for stable 5 V system rails with tight regulation tolerance
Operating Temperature	−40°C to +85°C - qualified for industrial and automotive-grade environments

Pinout & Package

MC74ACT14NG is supplied in a 14-lead SOIC-NB (Small Outline Integrated Circuit – Narrow Body) package, case 751A, with 1.27 mm pitch and Pb-free finish (G suffix). Dimensions: 8.55–8.75 mm × 3.80–4.00 mm × 1.35–1.75 mm height.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 9, 11, 13	Inverter Input	Individual Schmitt-trigger inputs for each of six inverter channels
2, 4, 6, 10, 12, 14	Inverter Output	CMOS-compatible buffered outputs with ±24 mA drive strength
7	GND	Ground reference for all logic and power domains
14	V_CC	Positive supply rail (4.5–5.5 V); decoupling capacitor required near pin

Key Features

Feature	Design Value
Schmitt-trigger input hysteresis	1.2 V min at 5.5 V supply - eliminates chatter on slow-rising/falling signals like switch closures or RC-generated clocks
TTL-compatible input thresholds	V_IH ≥ 2.0 V, V_IL ≤ 0.8 V - enables plug-and-play integration with legacy 5 V TTL logic without pull-ups or translators
High-output current drive	±24 mA per output - sufficient to drive 10+ standard CMOS inputs or small LED indicators directly
AEC-Q100 qualification	Qualified for automotive applications (−Q variant exists); MC74ACT14NG meets same reliability standards via shared process and test flow
Pb-free and RoHS-compliant	Meets EU RoHS Directive 2011/65/EU and halogen-free/BFR-free requirements - supports green manufacturing compliance

Applications

Industrial Switch Debouncing	Microcontroller Clock Conditioning
Use Scenario: Mechanical pushbuttons or limit switches generate contact bounce lasting milliseconds, causing false interrupts in PLCs or motor controllers. IC Role / Device Role / Timing Role: MC74ACT14NG acts as a hardware debouncer - its Schmitt-trigger inputs convert noisy switch transitions into clean, jitter-free digital edges. Use Value: Eliminates need for software debouncing delays or external RC networks, reducing MCU firmware complexity and improving real-time response.	Use Scenario: Crystal oscillator outputs often exhibit slow rise/fall times or amplitude instability, risking timing violations in microcontroller clock inputs. IC Role / Device Role / Timing Role: MC74ACT14NG reshapes the oscillator signal into a fast-rising, rail-to-rail square wave with precise thresholds before feeding the MCU clock pin. Use Value: Guarantees reliable clock startup and jitter-free operation across temperature and voltage variations - critical for deterministic real-time execution.
RS-232 Line Receiver Interface	Legacy Bus Signal Regeneration
Use Scenario: RS-232 receivers output logic-level signals with marginal noise margins and slow edges, especially over long cables or in EMI-heavy factory floors. IC Role / Device Role / Timing Role: MC74ACT14NG serves as a buffer and threshold stabilizer - converting marginal logic levels into robust CMOS-compatible signals for downstream logic. Use Value: Restores noise immunity and edge integrity without adding propagation delay beyond 11.5 ns, preserving timing budgets in serial communication chains.	Use Scenario: Aging industrial equipment uses obsolete logic families (e.g., 74LS) with degraded output drive or inconsistent thresholds, causing intermittent bus errors. IC Role / Device Role / Timing Role: MC74ACT14NG regenerates bus signals - accepting weak or noisy LS outputs and re-driving them with strong, hysteresis-stabilized CMOS levels. Use Value: Extends service life of legacy systems by restoring signal integrity without redesigning PCBs or replacing entire subsystems.

Industrial Switch Debouncing

Microcontroller Clock Conditioning

Use Scenario: Mechanical pushbuttons or limit switches generate contact bounce lasting milliseconds, causing false interrupts in PLCs or motor controllers.

IC Role / Device Role / Timing Role: MC74ACT14NG acts as a hardware debouncer - its Schmitt-trigger inputs convert noisy switch transitions into clean, jitter-free digital edges.

Use Value: Eliminates need for software debouncing delays or external RC networks, reducing MCU firmware complexity and improving real-time response.

Use Scenario: Crystal oscillator outputs often exhibit slow rise/fall times or amplitude instability, risking timing violations in microcontroller clock inputs.

IC Role / Device Role / Timing Role: MC74ACT14NG reshapes the oscillator signal into a fast-rising, rail-to-rail square wave with precise thresholds before feeding the MCU clock pin.

Use Value: Guarantees reliable clock startup and jitter-free operation across temperature and voltage variations - critical for deterministic real-time execution.

RS-232 Line Receiver Interface

Legacy Bus Signal Regeneration

Use Scenario: RS-232 receivers output logic-level signals with marginal noise margins and slow edges, especially over long cables or in EMI-heavy factory floors.

IC Role / Device Role / Timing Role: MC74ACT14NG serves as a buffer and threshold stabilizer - converting marginal logic levels into robust CMOS-compatible signals for downstream logic.

Use Value: Restores noise immunity and edge integrity without adding propagation delay beyond 11.5 ns, preserving timing budgets in serial communication chains.

Use Scenario: Aging industrial equipment uses obsolete logic families (e.g., 74LS) with degraded output drive or inconsistent thresholds, causing intermittent bus errors.

IC Role / Device Role / Timing Role: MC74ACT14NG regenerates bus signals - accepting weak or noisy LS outputs and re-driving them with strong, hysteresis-stabilized CMOS levels.

Use Value: Extends service life of legacy systems by restoring signal integrity without redesigning PCBs or replacing entire subsystems.

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex Schmitt-trigger inverter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT14DR	Same logic function, TTL-compatible inputs, ±24 mA drive; identical AC/DC specs but TI-marked SOIC-14 package	No AEC-Q100 qualification; not rated for automotive use	Preferred for cost-sensitive commercial designs where automotive qualification is unnecessary
74HC14D,653	CMOS-input-only (not TTL-compatible); lower drive (±4 mA), higher hysteresis (~1.5 V at 5 V), slower propagation (105 ns max)	Requires input pull-up for TTL sources; unsuitable for driving heavy loads or high-speed edges	Selected when only CMOS-level inputs are present and low power consumption is prioritized over speed or drive strength

Compared with SN74ACT14DR and 74HC14D,653, the MC74ACT14NG uniquely combines automotive-grade reliability (AEC-Q100 alignment), TTL compatibility, and 24 mA drive in a single SOIC-14 package - making it optimal for industrial control and automotive body electronics where signal integrity and qualification matter.

Availability

MC74ACT14NG is available at Aetrix Electronics and suitable for industrial automation, automotive body control modules, and embedded sensor interface designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MC74ACT14NG 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 management, analog, sensing, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The MC74ACT14NG belongs to onsemi's 74ACT logic family - engineered for high-speed, noise-immune digital interfacing in harsh environments where signal fidelity and reliability are non-negotiable.

FAQ

What is the supply voltage range for MC74ACT14NG?

The MC74ACT14NG operates strictly within 4.5 V to 5.5 V DC. Unlike the broader 74AC series, the 'T' in MC74ACT14NG denotes TTL-compatible input thresholds, which are only guaranteed across this tighter 5 V ±10% range. Operation outside this window may result in undefined input behavior or reduced noise margin.

Does MC74ACT14NG support true TTL input levels?

Yes - MC74ACT14NG accepts standard TTL input voltages: V_IL ≤ 0.8 V (guaranteed low) and V_IH ≥ 2.0 V (guaranteed high) at V_CC = 4.5–5.5 V. This allows direct interfacing with legacy 74LS, 74F, and other TTL-family outputs without level shifters or pull-up resistors.

What is the hysteresis voltage of MC74ACT14NG at 5.0 V supply?

At V_CC = 5.0 V, the MC74ACT14NG exhibits a minimum hysteresis of 1.2 V, defined as the difference between positive-going (V_t+) and negative-going (V_t−) input thresholds. Typical hysteresis is 1.4 V, and it remains stable across temperature and supply variation due to internal transistor ratio design.

Can MC74ACT14NG drive an LED directly?

Yes - each output of MC74ACT14NG can sink up to 24 mA continuously. When configured as a low-side driver (anode to V_CC, cathode to output), it can directly illuminate standard 2 mA–20 mA indicator LEDs. Ensure current-limiting resistor is sized for V_OL ≤ 0.44 V and forward voltage drop to avoid exceeding I_OL rating.

Is MC74ACT14NG pin-compatible with MC74AC14NG?

No - although both share identical pinout (SOIC-14, same function-to-pin mapping), MC74ACT14NG has TTL-compatible inputs while MC74AC14NG uses CMOS-level inputs (V_IH ≈ 3.5 V at 5 V). Swapping them may cause logic misreads if driven by TTL sources, despite mechanical compatibility.

MC74ACT14NG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74ACT

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

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Inverter

Number of Circuits:: 6

Number of Inputs:: 1

Features:: Schmitt Trigger

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:: 11.5ns @ 5V, 50pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-PDIP

MC74ACT14NG FAQ

1.How can I place an order for MC74ACT14NG through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74ACT14NG 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 MC74ACT14NG reliable?

The price and inventory of MC74ACT14NG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT14NG is usually 5 days.

3.What payment methods are accepted for MC74ACT14NG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT14NG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74ACT14NG?

MC74ACT14NG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74ACT14NG 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 MC74ACT14NG?

For technical support, including MC74ACT14NG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT14NG requirements.

6.How does Aetrix verify that MC74ACT14NG is sourced from the original manufacturer or authorized distributors?

All MC74ACT14NG 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 MC74ACT14NG meets industry standards.

7.What is the process for return or replacement of MC74ACT14NG?

All MC74ACT14NG units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT14NG, 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 MC74ACT14NG part is unused and in its original packaging.

Return procedure for MC74ACT14NG:

1.Submit a request within 90 days.

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

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