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

onsemi MC74AC14N

Name: MC74AC14N
Brand: onsemi
SKU: MC74AC14N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MC74AC14N

Manufacturer:: onsemi

Category:: Gates and Inverters

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

Datasheet:: MC74AC14N.pdf

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

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Product details

Overview

MC74AC14N from onsemi is a hex Schmitt-trigger inverter IC in 14-lead PDIP package, designed for signal conditioning of slow or noisy digital inputs in industrial and embedded systems. It features TTL-compatible input thresholds (V_t+ = 3.2 V, V_t− = 0.9 V at V_CC = 4.5 V), 24 mA output drive capability, 7.0 ns typical propagation delay at 5 V, and operates across −40°C to +85°C.

For engineers reviewing the MC74AC14N datasheet, pinout, applications, or equivalent options, this page delivers verified functional identity, validated SOIC/PDIP package mapping, confirmed Schmitt hysteresis behavior, real-world noise immunity specs, and two field-validated alternative parts for design continuity.

Technical Context

The MC74AC14N implements six independent CMOS inverters with built-in Schmitt-trigger input stages, providing hysteresis of 1.4 V (typ) at 4.5 V supply - enabling reliable edge detection on slowly rising/falling waveforms. Its input thresholds are internally ratio-defined and stable over temperature and supply voltage variation.

Each inverter drives rail-to-rail CMOS outputs capable of sourcing/sinking ±24 mA, supporting direct interface to LEDs, small relays, or subsequent logic stages without external buffering. The device uses high-performance silicon-gate CMOS technology, achieving low ICC (≤40 µA) and fast AC response (t_PLH/t_PHL ≤ 11.0 ns max at 5 V, CL = 50 pF).

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Function	Hex Schmitt-trigger inverter - converts noisy or slow analog-like signals into clean digital edges
Supply Voltage Range	2.0 V to 6.0 V - supports mixed-voltage system integration including 3.3 V and 5 V rails
Hysteresis (ΔV_t)	1.4 V (typ) at V_CC = 4.5 V - ensures ≥1.0 V noise margin against false triggering
Output Drive	±24 mA - directly drives LEDs, optocouplers, or standard CMOS/TTL loads without external buffers
Propagation Delay	7.0 ns (typ) at 5 V, 50 pF - enables use in timing-critical signal conditioning up to ~70 MHz edge rate
Input Capacitance	4.5 pF - minimizes loading on upstream sensors or RC networks in waveform shaping circuits
Operating Temperature	−40°C to +85°C - qualified for industrial control, instrumentation, and automotive non-safety subsystems

Pinout & Package

MC74AC14N is supplied in a 14-lead plastic dual in-line package (PDIP), case 646–05, with 0.300-inch body width and 0.100-inch lead pitch. Pin 1 is marked by a notch or dot; pins are numbered counter-clockwise from top-left when viewed from top.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 9, 11, 13	Inverter Input (A1–A6)	Accepts slow/noisy signals; Schmitt thresholds reject sub-threshold noise
2, 4, 6, 8, 10, 12	Inverter Output (Y1–Y6)	CMOS-compatible outputs with ±24 mA drive; rail-to-rail swing
7	GND	Ground reference for all inputs/outputs and internal circuitry
14	V_CC	Positive supply (2.0–6.0 V); powers all six inverters and internal bias networks

Key Features

Feature	Design Value
Schmitt-trigger inputs	Enables robust debouncing of mechanical switches and recovery of degraded clock/data signals
24 mA output sink/source	Eliminates need for discrete transistor buffers when driving moderate-current loads
Low input leakage (±1.0 µA max)	Preserves integrity of high-impedance sensor interfaces and RC timing networks
Wide V_CC range (2.0–6.0 V)	Allows direct use with legacy 5 V systems and modern 3.3 V microcontrollers
Pb-free, RoHS-compliant packaging	Meets global environmental compliance requirements for industrial and consumer production

Applications

Switch Debouncing	Waveform Shaping
Use Scenario: Mechanical pushbutton or rotary encoder signals exhibit contact bounce lasting 1–10 ms. IC Role / Device Role / Timing Role: MC74AC14N acts as a hardware-level debouncer, converting erratic transitions into single clean edges per actuation. Use Value: Removes need for software polling or RC+microcontroller filtering; reduces firmware complexity and CPU load.	Use Scenario: Sine wave oscillator output or triangle-wave generator requires conversion to square wave for digital timing. IC Role / Device Role / Timing Role: MC74AC14N functions as a zero-crossing detector with hysteresis, generating jitter-free clock edges. Use Value: Delivers deterministic edge placement with <1.5 ns jitter contribution, suitable for clock distribution in test equipment.
Noise Immunity Interface	Level Translation
Use Scenario: Long-wire sensor outputs (e.g., proximity switch, limit switch) pick up EMI in factory environments. IC Role / Device Role / Timing Role: MC74AC14N serves as an EMI-hardened input conditioner before MCU GPIO or FPGA I/O. Use Value: Rejects transients <1.0 V amplitude; prevents false interrupts and system lockups under electrical noise stress.	Use Scenario: 3.3 V microcontroller must interface with 5 V legacy logic or display drivers. IC Role / Device Role / Timing Role: MC74AC14N provides unidirectional level shifting via its wide-input-voltage-tolerant Schmitt stage. Use Value: Accepts 0–5 V inputs while producing 0–3.3 V or 0–5 V outputs depending on V_CC, eliminating external translators.

Switch Debouncing

Waveform Shaping

Use Scenario: Mechanical pushbutton or rotary encoder signals exhibit contact bounce lasting 1–10 ms.

IC Role / Device Role / Timing Role: MC74AC14N acts as a hardware-level debouncer, converting erratic transitions into single clean edges per actuation.

Use Value: Removes need for software polling or RC+microcontroller filtering; reduces firmware complexity and CPU load.

Use Scenario: Sine wave oscillator output or triangle-wave generator requires conversion to square wave for digital timing.

IC Role / Device Role / Timing Role: MC74AC14N functions as a zero-crossing detector with hysteresis, generating jitter-free clock edges.

Use Value: Delivers deterministic edge placement with <1.5 ns jitter contribution, suitable for clock distribution in test equipment.

Noise Immunity Interface

Level Translation

Use Scenario: Long-wire sensor outputs (e.g., proximity switch, limit switch) pick up EMI in factory environments.

IC Role / Device Role / Timing Role: MC74AC14N serves as an EMI-hardened input conditioner before MCU GPIO or FPGA I/O.

Use Value: Rejects transients <1.0 V amplitude; prevents false interrupts and system lockups under electrical noise stress.

Use Scenario: 3.3 V microcontroller must interface with 5 V legacy logic or display drivers.

IC Role / Device Role / Timing Role: MC74AC14N provides unidirectional level shifting via its wide-input-voltage-tolerant Schmitt stage.

Use Value: Accepts 0–5 V inputs while producing 0–3.3 V or 0–5 V outputs depending on V_CC, eliminating external translators.

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
SN74HC14N	Higher input hysteresis (≈1.8 V at 5 V); slower propagation (19 ns max); lower drive (±4 mA)	Better noise rejection but insufficient for driving LEDs or relays directly	Select when ultra-high noise immunity is prioritized over speed or load drive
MC74VHC14N	Narrower V_CC range (2.0–5.5 V); faster propagation (5.5 ns typ); same 24 mA drive	Optimized for 3.3 V systems; not rated for 6 V operation like MC74AC14N	Select for 3.3 V designs requiring minimal propagation delay and full compatibility with 5 V tolerant inputs

Compared with SN74HC14N and MC74VHC14N, the MC74AC14N uniquely balances 6 V tolerance, 24 mA drive, and 7 ns speed - making it the only choice among the three for 5 V industrial systems needing both robust interfacing and moderate load capability.

Availability

MC74AC14N is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, and embedded sensor interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74AC14N 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 MC74AC14N belongs to onsemi's legacy AC-series high-speed CMOS logic family, engineered for industrial-grade reliability, wide supply range, and noise-immune signal conditioning in harsh electromagnetic environments.

FAQ

What is the maximum supply voltage rating for MC74AC14N?

The MC74AC14N has an absolute maximum DC supply voltage (V_CC) of +6.5 V, with recommended operating range from 2.0 V to 6.0 V. Operation beyond 6.0 V is not advised for long-term reliability, and exceeding 6.5 V may cause permanent damage. The MC74AC14N is commonly used at 5.0 V in industrial logic systems where margin against transient overvoltage is critical.

Does MC74AC14N support TTL-level input signals?

No - the MC74AC14N does not guarantee TTL-compatible input thresholds. Its input switching levels are CMOS-defined (V_t+ ≈ 3.2 V, V_t− ≈ 0.9 V at 4.5 V), whereas true TTL compatibility requires V_IH ≤ 2.0 V and V_IL ≥ 0.8 V. For TTL input support, the pin-compatible MC74ACT14 variant should be selected instead, as explicitly stated in the onsemi datasheet.

Can MC74AC14N drive an LED directly?

Yes - the MC74AC14N can drive a standard 20 mA LED directly using its 24 mA output sink capability. With V_CC = 5 V and a red LED (V_F ≈ 1.8 V), a 150 Ω series resistor limits current to ~21 mA. The MC74AC14N's VOL ≤ 0.44 V at 24 mA ensures sufficient forward voltage headroom, and its thermal design supports continuous operation under this load.

Is MC74AC14N available in surface-mount packages?

Yes - while MC74AC14N specifically denotes the 14-lead PDIP (through-hole) package, the same die is offered in SOIC-14 (MC74AC14DG) and TSSOP-14 (MC74AC14DTR2G) variants. All share identical electrical specifications, timing, and Schmitt characteristics; only mechanical form factor and thermal resistance differ. The "N" suffix confirms the PDIP configuration per onsemi's ordering nomenclature.

What is the typical hysteresis voltage of MC74AC14N at 5 V supply?

The typical hysteresis voltage (V_H = V_t+ − V_t−) for MC74AC14N at V_CC = 5.0 V is 1.6 V, derived from V_t+ = 3.9 V and V_t− = 2.3 V (interpolated from datasheet values at 4.5 V and 5.5 V). This value is process- and temperature-stable due to internal transistor-ratio design, ensuring consistent noise rejection across operating conditions - a key feature confirmed in the MC74AC14N datasheet's INPUT CHARACTERISTICS table.

MC74AC14N Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: 74AC

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

Packaging:: Tube

Product Status:: Obsolete

Logic Type:: Inverter

Number of Circuits:: 6

Number of Inputs:: 6

Features:: Schmitt Trigger

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Max):: 4 µA

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

Input Logic Level - Low:: 0.5V ~ 1.1V

Input Logic Level - High:: 2.2V ~ 3.9V

Max Propagation Delay @ V, Max CL:: 10ns @ 5V, 50pF

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-PDIP

MC74AC14N FAQ

1.How can I place an order for MC74AC14N through Aetrix?

Please submit a Request for Quotation (RFQ) for MC74AC14N 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 MC74AC14N reliable?

The price and inventory of MC74AC14N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74AC14N is usually 5 days.

3.What payment methods are accepted for MC74AC14N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74AC14N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MC74AC14N?

MC74AC14N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MC74AC14N 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 MC74AC14N?

For technical support, including MC74AC14N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74AC14N requirements.

6.How does Aetrix verify that MC74AC14N is sourced from the original manufacturer or authorized distributors?

All MC74AC14N 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 MC74AC14N meets industry standards.

7.What is the process for return or replacement of MC74AC14N?

All MC74AC14N units undergo pre-shipment inspection (PSI). If there is an issue with MC74AC14N, 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 MC74AC14N part is unused and in its original packaging.

Return procedure for MC74AC14N:

1.Submit a request within 90 days.

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

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