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

NXP Semiconductors 74HC14D/AUJ

Name: 74HC14D/AUJ
Brand: NXP Semiconductors
SKU: 74HC14D/AUJ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74HC14D/AUJ

Manufacturer:: NXP Semiconductors

Category:: Gates and Inverters

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: 74HC14D/AUJ.pdf

Description:: IC INVERT SCHMITT 6CH 1-INP 14SO

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Product details

Overview

74HC14D/AUJ from Nexperia is a hex inverting Schmitt trigger IC operating from 2.0 V to 6.0 V, featuring six independent channels with hysteresis (V_H = 0.6–1.6 V at V_CC = 2.0–6.0 V), TTL-compatible input thresholds, and propagation delay as low as 12 ns at V_CC = 6.0 V. It is used for waveform shaping and noise-immune signal conditioning in industrial control interfaces and sensor signal preprocessing.

For engineers reviewing the 74HC14D/AUJ datasheet, 74HC14D/AUJ pinout, 74HC14D/AUJ application, or 74HC14D/AUJ equivalent, this device delivers deterministic edge regeneration for slow-rising inputs, supports -40 °C to +125 °C operation, and enables robust clockless timing circuits without external feedback components.

Technical Context

The 74HC14D/AUJ implements six independent CMOS Schmitt-trigger inverters with asymmetric input threshold voltages: VT+ = 1.7–5.9 V and VT− = 0.3–4.2 V across V_CC = 2.0–6.0 V. Each channel transforms slow or noisy analog-like transitions into clean digital outputs via built-in hysteresis.

It uses standard HC logic family architecture with clamp diodes on all inputs, enabling safe interfacing to voltages exceeding V_CC when current-limiting resistors are applied. Input leakage remains ≤ ±1.0 μA over temperature, and output drive capability is ±25 mA per pin under limiting conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage	2.0 V to 6.0 V - Enables direct compatibility with 3.3 V and 5 V systems without level shifters.
Propagation delay	12 ns (typ) at V_CC = 6.0 V - Supports reliable signal regeneration up to ~40 MHz in multivibrator configurations.
Hysteresis voltage	0.6–1.6 V - Provides noise immunity margin sufficient to reject >300 mV of superimposed interference on input signals.
Input threshold (VT+)	1.7 V (min) at V_CC = 4.5 V - Ensures reliable recognition of TTL-level HIGH inputs down to 2.0 V supply.
Output drive	±25 mA (max) - Sufficient to directly drive LEDs, small relays, or fan-out to ≥10 LS-TTL loads.
Operating temperature	-40 °C to +125 °C - Qualified for under-hood automotive subsystems and industrial motor control environments.
ESD rating	HBM >2000 V - Reduces risk of field failure during manual handling or board assembly.

Pinout & Package

74HC14D/AUJ is housed in an SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm pitch, 1.75 mm max height. Pin 1 is index-marked; pin 7 is GND; pin 14 is V_CC.

Pin/Terminal	Circuit Role	Design Meaning
1, 3, 5, 9, 11, 13	Data input (1A–6A)	Schmitt-triggered inputs accepting slow-rising/falling waveforms; clamp diodes allow overvoltage tolerance with series resistors.
2, 4, 6, 8, 10, 12	Data output (1Y–6Y)	Inverted, jitter-free digital outputs; each capable of sourcing/sinking ≥4 mA at V_CC = 4.5 V with defined VOH/VOL.
7	GND	Reference ground for all inputs, outputs, and internal circuitry; must be connected to system 0 V plane.
14	V_CC	Main supply rail; decoupling capacitor (100 nF) recommended within 5 mm of this pin for stable switching behavior.

Key Features

Feature	Design Value
Wide supply range	2.0–6.0 V operation allows single-part support across legacy 5 V and modern 3.3 V embedded designs.
Unlimited input rise/fall times	Eliminates need for external RC networks to meet minimum slew rate requirements in relaxation oscillator or debouncing applications.
High noise immunity	Typical 1.25 V hysteresis at V_CC = 5 V ensures reliable switching despite >200 mV of broadband noise on sensor or switch inputs.
Latch-up immunity	Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events.
Multiple package options	SO14 (74HC14D), TSSOP14 (74HC14PW), DHVQFN14 (74HC14BQ) - enables layout flexibility for space-constrained or thermally demanding PCBs.

Applications

Waveform Shaping	Astable Multivibrator
Use Scenario: Converting noisy or slowly varying analog sensor outputs (e.g., thermistor divider, potentiometer wiper) into clean square waves for microcontroller capture timers. IC Role / Device Role / Timing Role: Six independent Schmitt-trigger inverters act as input conditioners, each providing deterministic zero-crossing detection with hysteresis. Use Value: Eliminates software debouncing overhead and prevents false edge detection caused by EMI or contact bounce in industrial HMI panels.	Use Scenario: Generating fixed-frequency clock signals for LED flashers, status indicators, or low-speed data transmission where crystal precision is unnecessary. IC Role / Device Role / Timing Role: One inverter plus external R-C network forms a relaxation oscillator; remaining inverters buffer or divide the output. Use Value: Achieves stable oscillation from 1 Hz to 100 kHz using only two passive components per stage-no external crystal or dedicated timer IC required.
Monostable Multivibrator	Switch Debouncing
Use Scenario: Creating precise one-shot pulses triggered by mechanical pushbuttons or limit switches in PLC I/O modules. IC Role / Device Role / Timing Role: Inverter-based edge-triggered monostable circuit generating fixed-duration output pulses independent of input pulse width. Use Value: Guarantees consistent 10–100 ms pulse widths for relay driver activation, eliminating timing drift due to component aging or temperature variation.	Use Scenario: Cleaning up bounce-prone signals from tactile switches, rotary encoders, or emergency stop buttons in factory automation panels. IC Role / Device Role / Timing Role: Dual-inverter feedback loop with RC timing network provides hardware-level synchronization and metastability suppression. Use Value: Delivers glitch-free digital inputs to FPGA or MCU GPIO pins without firmware polling or interrupt masking delays.

Waveform Shaping

Astable Multivibrator

Use Scenario: Converting noisy or slowly varying analog sensor outputs (e.g., thermistor divider, potentiometer wiper) into clean square waves for microcontroller capture timers.

IC Role / Device Role / Timing Role: Six independent Schmitt-trigger inverters act as input conditioners, each providing deterministic zero-crossing detection with hysteresis.

Use Value: Eliminates software debouncing overhead and prevents false edge detection caused by EMI or contact bounce in industrial HMI panels.

Use Scenario: Generating fixed-frequency clock signals for LED flashers, status indicators, or low-speed data transmission where crystal precision is unnecessary.

IC Role / Device Role / Timing Role: One inverter plus external R-C network forms a relaxation oscillator; remaining inverters buffer or divide the output.

Use Value: Achieves stable oscillation from 1 Hz to 100 kHz using only two passive components per stage-no external crystal or dedicated timer IC required.

Monostable Multivibrator

Switch Debouncing

Use Scenario: Creating precise one-shot pulses triggered by mechanical pushbuttons or limit switches in PLC I/O modules.

IC Role / Device Role / Timing Role: Inverter-based edge-triggered monostable circuit generating fixed-duration output pulses independent of input pulse width.

Use Value: Guarantees consistent 10–100 ms pulse widths for relay driver activation, eliminating timing drift due to component aging or temperature variation.

Use Scenario: Cleaning up bounce-prone signals from tactile switches, rotary encoders, or emergency stop buttons in factory automation panels.

IC Role / Device Role / Timing Role: Dual-inverter feedback loop with RC timing network provides hardware-level synchronization and metastability suppression.

Use Value: Delivers glitch-free digital inputs to FPGA or MCU GPIO pins without firmware polling or interrupt masking delays.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
74HCT14D	TTL-compatible input thresholds (VT+ = 1.2–2.1 V); identical SO14 package and pinout.	Better suited for mixed 5 V TTL/CMOS systems where input VIH min = 2.0 V is insufficient.	Select 74HCT14D when interfacing to legacy 5 V TTL outputs; otherwise retain 74HC14D/AUJ for wider V_CC flexibility.
SN74LVC14APW	Lower V_CC range (1.65–5.5 V); higher speed (t_pd = 7.5 ns typ at 3.3 V); TSSOP14-only packaging.	Preferred for battery-powered IoT nodes requiring 1.8 V operation and minimal propagation delay.	Choose SN74LVC14APW only if 1.65 V minimum supply or sub-10 ns timing is mandatory; not drop-in compatible at 2.0 V.

Compared with 74HCT14D and SN74LVC14APW, the 74HC14D/AUJ offers the broadest supply range (2.0–6.0 V) and highest temperature rating (+125 °C), making it optimal for industrial power supplies and wide-input-range sensor front-ends where voltage headroom and thermal margin are critical.

Availability

74HC14D/AUJ is available at Aetrix Electronics and suitable for industrial control interfaces, sensor signal conditioning, and timing circuit design requiring stable component supply across extended temperature ranges.

Supply support for 74HC14D/AUJ 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

Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency and miniaturization.

The 74HC14D/AUJ belongs to Nexperia's 74HC logic family, engineered for robust noise immunity and wide-voltage interoperability in industrial and consumer signal conditioning applications.

FAQ

What is the maximum supply voltage rating for the 74HC14D/AUJ?

The absolute maximum supply voltage (V_CC) for the 74HC14D/AUJ is +7.0 V, but the recommended operating range is 2.0 V to 6.0 V. Operation above 6.0 V risks exceeding static characteristics limits and may degrade long-term reliability. Always observe derating curves for total power dissipation when operating near maximum ratings.

Does the 74HC14D/AUJ support operation at 3.3 V?

Yes, the 74HC14D/AUJ fully supports 3.3 V operation within its specified 2.0–6.0 V range. At V_CC = 3.3 V, typical propagation delay is ~19 ns, VT+ is ~2.2 V, and VT− is ~1.0 V - ensuring reliable interfacing with 3.3 V microcontrollers and sensors while maintaining full hysteresis margin.

Can the 74HC14D/AUJ inputs tolerate voltages above V_CC?

Yes, the 74HC14D/AUJ inputs include clamp diodes that permit safe operation with input voltages up to V_CC + 0.5 V, provided input current is limited to ±20 mA. For inputs exceeding V_CC, use a series resistor to restrict current - e.g., a 10 kΩ resistor limits current to <100 μA for a 12 V input at V_CC = 5 V.

How many independent Schmitt-trigger inverters does the 74HC14D/AUJ contain?

The 74HC14D/AUJ contains six independent Schmitt-trigger inverters, each with dedicated input (1A–6A) and output (1Y–6Y) pins. All six channels share common V_CC (pin 14) and GND (pin 7), and operate simultaneously without crosstalk under recommended conditions.

Is the 74HC14D/AUJ pin-compatible with the 74HCT14D?

Yes, the 74HC14D/AUJ and 74HCT14D share identical SO14 (SOT108-1) packaging and pinout, including pin 1 (1A), pin 7 (GND), pin 14 (V_CC), and all six input/output pairs. However, their input threshold voltages differ: 74HC14D/AUJ uses CMOS-ratio thresholds, while 74HCT14D uses TTL-compatible thresholds - verify logic level compatibility before substitution.

74HC14D/AUJ Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74HC

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Logic Type:: Inverter

Number of Circuits:: 6

Number of Inputs:: 1

Features:: Schmitt Trigger

Voltage - Supply:: 2V ~ 6V

Current - Quiescent (Max):: 2 µA

Current - Output High, Low:: 5.2mA, 5.2mA

Input Logic Level - Low:: 0.3V ~ 1.2V

Input Logic Level - High:: 1.5V ~ 4.2V

Max Propagation Delay @ V, Max CL:: 21ns @ 6V, 50pF

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-SO

74HC14D/AUJ FAQ

1.How can I place an order for 74HC14D/AUJ through Aetrix?

Please submit a Request for Quotation (RFQ) for 74HC14D/AUJ 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 74HC14D/AUJ reliable?

The price and inventory of 74HC14D/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC14D/AUJ is usually 5 days.

3.What payment methods are accepted for 74HC14D/AUJ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC14D/AUJ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74HC14D/AUJ?

74HC14D/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74HC14D/AUJ 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 74HC14D/AUJ?

For technical support, including 74HC14D/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC14D/AUJ requirements.

6.How does Aetrix verify that 74HC14D/AUJ is sourced from the original manufacturer or authorized distributors?

All 74HC14D/AUJ 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 74HC14D/AUJ meets industry standards.

7.What is the process for return or replacement of 74HC14D/AUJ?

All 74HC14D/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74HC14D/AUJ, 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 74HC14D/AUJ part is unused and in its original packaging.

Return procedure for 74HC14D/AUJ:

1.Submit a request within 90 days.

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

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