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NXP Semiconductors 74AHCT14D,118
- Part No.:
- 74AHCT14D,118
- Manufacturer:
- NXP Semiconductors
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
74AHCT14D,118.pdf
- Description:
- IC INVERTER
- Quantity:
- Payment:
- Shipping:
Inventory:5,300
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Product details
Overview
74AHCT14D,118 from Nexperia is a hex inverting Schmitt trigger IC with TTL-compatible inputs, 14-pin SO14 package, -40 °C to +125 °C operating range, and 4.5 V–5.5 V supply voltage. It provides noise-immune signal conditioning for digital interface level-shifting and waveform shaping in mixed-voltage industrial control systems.
For engineers reviewing the 74AHCT14D,118 datasheet, 74AHCT14D,118 pinout, 74AHCT14D,118 application, or 74AHCT14D,118 equivalent, this device serves as a robust input conditioner for debouncing mechanical switches, cleaning noisy sensor outputs, and generating stable clock signals in legacy 5 V logic environments.
Technical Context
The 74AHCT14D,118 implements six independent Schmitt-trigger inverters with TTL-level input thresholds (VT+ = 1.9 V, VT− = 0.5 V at VCC = 4.5 V) and rail-to-rail CMOS output drive. Its hysteresis (VH = 1.4 V typical at VCC = 4.5 V) ensures reliable transition detection across slow or noisy edges.
It operates within a strict 4.5–5.5 V supply window and delivers balanced propagation delays (tpd = 4.0–9.0 ns at CL = 15–50 pF), low static current (ICC ≤ 40 μA at VCC = 5.5 V), and overvoltage-tolerant inputs rated to 5.5 V - enabling safe interfacing with higher-voltage nodes without external clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Hex inverting Schmitt trigger - provides six independent hysteresis-based inversion paths for noise rejection |
| Supply Voltage Range | 4.5 V to 5.5 V - designed exclusively for 5 V TTL-compatible systems; not functional below 4.5 V |
| Input Thresholds (VCC = 4.5 V) | VT+ = 1.9 V, VT− = 0.5 V - enables clean switching on slow-rising signals with ≥1.4 V hysteresis |
| Propagation Delay (CL = 15 pF) | 4.0 ns (typ), 9.0 ns (max) - supports reliable operation up to ~100 MHz in buffered clock distribution |
| Output Drive Strength | ±8 mA at VCC = 4.5 V - sufficient to directly drive multiple 74-series TTL inputs or small capacitive loads |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive modules and industrial motor drives |
| ESD Protection | HBM >2000 V, CDM >1000 V - withstands handling and board-level ESD events without latch-up |
Pinout & Package
74AHCT14D,118 uses the SO14 (SOT108-1) plastic small outline package: 14-lead, 3.9 mm body width, 1.27 mm lead pitch, and standard gull-wing lead form factor compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Data Input (1A–6A) | TTL-level Schmitt-trigger inputs - accept 0–5.5 V signals; tolerate overvoltage without damage |
| 2, 4, 6, 8, 10, 12 | Data Output (1Y–6Y) | Inverted CMOS outputs - swing rail-to-rail (0 V / VCC) with ±8 mA drive capability |
| 7 | GND | Ground reference - must be connected to system 0 V plane; decoupling capacitor required near pin |
| 14 | VCC | Positive supply - requires local 100 nF ceramic decoupling between pins 7 and 14 |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input thresholds | Ensures seamless integration into legacy 5 V microcontroller I/O, PLC inputs, and industrial bus receivers |
| 1.4 V typical hysteresis at 4.5 V | Rejects up to 1.4 V of superimposed noise on switch or sensor inputs without false triggering |
| Overvoltage-tolerant inputs (to 5.5 V) | Eliminates need for external series resistors or clamps when interfacing with 5 V open-collector or analog sources |
| Low ICC (≤40 μA at VCC = 5.5 V) | Enables use in always-on monitoring circuits without significant standby power penalty |
| Specified from -40 °C to +125 °C | Validated for continuous operation in engine control units, power supply supervisors, and factory automation controllers |
Applications
| Industrial Switch Debouncing | Motor Control Feedback Conditioning |
|---|---|
|
Use Scenario: Mechanical limit switches and emergency stop buttons generate contact bounce lasting 1–10 ms in harsh factory environments. IC Role / Device Role / Timing Role: Schmitt-trigger inverter acting as hardware debounce filter with fixed hysteresis threshold. Use Value: Eliminates need for software polling or RC+MCU firmware delay; reduces MCU interrupt load and improves response determinism. |
Use Scenario: Hall-effect or optical encoder signals exhibit edge jitter and EMI-induced glitches near high-current motor drivers. IC Role / Device Role / Timing Role: Signal conditioner placed between encoder output and microcontroller capture input. Use Value: Ensures clean, monotonic edges for accurate quadrature decoding and RPM calculation under electromagnetic stress. |
| Legacy Bus Signal Integrity | Relaxation Oscillator Generation |
|
Use Scenario: Interfacing modern microcontrollers with aging 5 V parallel buses (e.g., printer port, ISA-style I/O cards). IC Role / Device Role / Timing Role: Level translator and noise filter for bidirectional data lines carrying TTL-level signals. Use Value: Restores marginal signal margins caused by trace capacitance and crosstalk; prevents metastability in FPGA or MCU input synchronizers. |
Use Scenario: Low-cost timing generation for LED flashers, watchdog timers, or non-critical system clocks where crystal precision is unnecessary. IC Role / Device Role / Timing Role: Inverter-based relaxation oscillator using external R-C network (Fig. 10). Use Value: Provides stable, temperature-compensated oscillation frequency (e.g., 1–100 kHz) without quartz components or external clock sources. |
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 |
|---|---|---|---|
| 74AHC14D,118 | CMOS-input version; VT+ = 4.4 V at VCC = 4.5 V; wider 2.0–5.5 V supply range | Required where interfacing with 3.3 V logic or mixed-supply systems; unsuitable for pure 5 V TTL source compatibility | Select when system includes both 3.3 V and 5 V domains and input noise immunity must be maintained across supply voltages |
| SN74LV14APWR | Texas Instruments part; 2.0–5.5 V supply; VT+ = 2.5 V, VT− = 1.2 V at VCC = 3.3 V; lower max tpd (5.5 ns @ 15 pF) | Better suited for 3.3 V microcontroller GPIO conditioning; less hysteresis margin than AHCT variant at 5 V | Prefer for new 3.3 V designs requiring tighter timing budgets and lower dynamic power; verify VIH/VIL compatibility with 5 V sources |
Compared with 74AHC14D,118 and SN74LV14APWR, the 74AHCT14D,118 uniquely guarantees TTL-level input recognition at 5 V while maintaining full 125 °C operation - making it the only choice for drop-in replacement in legacy 5 V industrial equipment without redesigning input bias networks.
Availability
74AHCT14D,118 is available at Aetrix Electronics and suitable for industrial motor control, factory automation I/O modules, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT14D,118 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 focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions optimized for reliability and manufacturability.
The 74AHCT14D,118 belongs to Nexperia's industry-standard 74-series logic family, engineered specifically for robust signal conditioning in harsh-environment applications where noise immunity, thermal stability, and long-term supply assurance are critical.
FAQ
Can 74AHCT14D,118 operate at 3.3 V supply?
No. The 74AHCT14D,118 is specified only for 4.5–5.5 V operation per Table 5. At 3.3 V, input thresholds fall outside TTL recognition range and output drive degrades significantly. Use 74AHC14D,118 instead for 3.3 V compatibility.
What is the maximum capacitive load this device can drive reliably?
The datasheet specifies performance up to 50 pF (Table 7). Driving >50 pF increases propagation delay nonlinearly and may cause ringing or undershoot. For >100 pF loads, add a series resistor (22–47 Ω) near the output to dampen reflections.
Is the SO14 package RoHS-compliant and lead-free?
Yes. Nexperia confirms the 74AHCT14D,118 in SOT108-1 package meets RoHS Directive 2011/65/EU and is lead-free, with homogeneous lead content < 0.1 wt% in all solderable terminations and packaging materials.
Does this device require external pull-up or pull-down resistors on unused inputs?
Yes. Unused inputs must be terminated to VCC or GND. Floating Schmitt-trigger inputs can oscillate due to noise, increasing ICC and causing unintended output switching. A 10 kΩ pull-up to VCC is recommended for consistency with TTL input behavior.
74AHCT14D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- 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:
- -
74AHCT14D,118 FAQ
1.How can I place an order for 74AHCT14D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT14D,118 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 74AHCT14D,118 reliable?
The price and inventory of 74AHCT14D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT14D,118 is usually 5 days.
3.What payment methods are accepted for 74AHCT14D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT14D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT14D,118?
74AHCT14D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT14D,118 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 74AHCT14D,118?
For technical support, including 74AHCT14D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT14D,118 requirements.
6.How does Aetrix verify that 74AHCT14D,118 is sourced from the original manufacturer or authorized distributors?
All 74AHCT14D,118 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 74AHCT14D,118 meets industry standards.
7.What is the process for return or replacement of 74AHCT14D,118?
All 74AHCT14D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT14D,118, 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 74AHCT14D,118 part is unused and in its original packaging.
Return procedure for 74AHCT14D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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