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STMicroelectronics 74AC14TTR
- Part No.:
- 74AC14TTR
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74AC14TTR.pdf
- Description:
- IC INVERT SCHMIT 6CH 6IN 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,589
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Product details
Overview
74AC14TTR from STMicroelectronics is a high-speed CMOS hex Schmitt trigger inverter with 6 independent channels, operating from 2V to 6V supply, 4.5ns typical propagation delay at 5V, ±24mA symmetrical output drive, and 2kV ESD immunity. It interfaces slow-rising digital signals in clock conditioning and noise-prone sensor signal conditioning circuits.
For engineers reviewing the 74AC14TTR datasheet, 74AC14TTR pinout, 74AC14TTR application, or 74AC14TTR equivalent, key selection criteria include hysteresis voltage (0.3–1.6V), input threshold symmetry (Vt+ = 3.9V / Vt− = 1.1V at 5.5V), transmission-line driving capability (50Ω), and industrial temperature range (−55°C to +125°C).
Technical Context
The device implements six independent Schmitt-trigger inverters using sub-micron C2MOS technology, each with three-stage buffered output for enhanced noise immunity. Its hysteresis (0.3–1.6V) enables reliable switching on slow-edge inputs like mechanical switch debouncing or analog sensor outputs.
Propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = |IOL| ≥ 24mA), supporting bidirectional signal integrity in mixed-signal interface applications without external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports dual-supply systems and legacy 5V logic while enabling 3.3V compatibility |
| tPD (Typ) | 4.5ns at VCC = 5V - enables high-frequency clock shaping up to ~100MHz edge rates |
| Hysteresis (Vh) | 0.3–1.6V - rejects noise spikes ≤1.6V and ensures clean transitions on slow-rising inputs |
| IOL / IOH | ≥24mA - drives 50Ω transmission lines directly without external buffers |
| ICC (Max) | 4µA at TA = 25°C - ultra-low static power for battery-backed or always-on monitoring nodes |
| ESD Rating | 2kV HBM - protects against handling-induced discharge in assembly and field service |
| Operating Temp | −55°C to +125°C - qualified for automotive under-hood and industrial motor control environments |
Pinout & Package
TSSOP-14 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 14-pin surface-mount, moisture sensitivity level 1 (MSL1), lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Input (1A–6A) | CMOS Schmitt-trigger inputs accepting 0–VCC logic levels with hysteresis |
| 2, 4, 6, 8, 10, 12 | Output (1Y–6Y) | Inverted, buffered outputs capable of sourcing/sinking ≥24mA |
| 7 | GND | Reference ground for all I/O and internal logic stages |
| 14 | VCC | Positive supply rail (2–6V); decoupling capacitor required per channel group |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger input hysteresis | 0.3–1.6V programmable via VCC - eliminates contact bounce and EMI-induced false triggering |
| Symmetrical output drive | |IOH| = |IOL| ≥ 24mA - ensures matched rise/fall times and minimal skew in timing-critical paths |
| Balanced propagation delays | tPLH ≅ tPHL - preserves duty cycle integrity in clock inversion and waveform reshaping |
| 50Ω transmission-line drive | Validated at CL = 50pF, RL = 500Ω, ZOUT ≈ 50Ω - eliminates need for series termination resistors |
Applications
| Switch Debouncing | Sensor Signal Conditioning |
|---|---|
Use Scenario: Mechanical push-button or relay contact closure in industrial HMI panels. IC Role / Device Role / Timing Role: Schmitt-trigger inverter cleans noisy, slow-rising switch edges into clean digital pulses. Use Value: Eliminates need for RC filters and microcontroller polling; reduces firmware complexity and latency. | Use Scenario: Analog output from temperature or pressure sensors feeding MCU ADC inputs. IC Role / Device Role / Timing Role: Converts slowly varying analog thresholds into robust digital enable/control signals. Use Value: Provides noise-immune level detection without software hysteresis algorithms or external comparators. |
| Waveform Reshaping | Legacy Bus Interface |
Use Scenario: Restoring degraded clock or data signals in long PCB traces or backplanes. IC Role / Device Role / Timing Role: Inverts and sharpens attenuated or distorted waveforms with matched tPLH/tPHL. Use Value: Recovers signal integrity without adding jitter; maintains timing margins in synchronous systems. | Use Scenario: Interfacing TTL-level peripherals (e.g., legacy UART transceivers) to modern 3.3V logic. IC Role / Device Role / Timing Role: Level-shifting and noise filtering between mixed-voltage subsystems. Use Value: Tolerates wide VCC range (2–6V) and provides 2kV ESD protection on both sides of interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schmitt-trigger inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV14APWR | Lower drive (±12mA), narrower VCC (2–5.5V), lower hysteresis (0.2–0.8V) | Optimized for low-power 3.3V systems; insufficient for 50Ω line driving | Select when power budget <1µA and load current <12mA is acceptable |
| MC74VHC14DT | Higher ICC (max 20µA), wider hysteresis (0.4–2.0V), same 24mA drive | Better noise margin at 3.3V but higher quiescent consumption | Prefer for high-noise industrial settings where static power is secondary to robustness |
Compared with SN74LV14APWR and MC74VHC14DT, the 74AC14TTR uniquely balances ultra-low ICC (4µA), full 50Ω line drive, and wide temperature range - making it optimal for space-constrained, battery-aware, and automotive-grade signal conditioning.
Availability
74AC14TTR is available at Aetrix Electronics and suitable for industrial HMI panels, automotive sensor interfaces, legacy bus adapters, and precision waveform reshaping requiring stable component supply across extended temperature ranges.
Supply support for 74AC14TTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensing solutions for automotive, industrial, and consumer markets.
The 74AC logic family delivers advanced CMOS performance with AC-speed, low power, and robust ESD tolerance - specifically engineered for noise-immune digital interfacing in harsh environments.
FAQ
What is the minimum supply voltage for guaranteed Schmitt-trigger operation?
The 74AC14TTR guarantees correct Schmitt-trigger behavior down to VCC = 2V, with validated hysteresis (Vt+ − Vt−) ≥ 0.3V across −55°C to +125°C. Below 2V, input thresholds become undefined and hysteresis collapses, risking metastability on slow edges.
Can 74AC14TTR drive a 50Ω coaxial cable directly?
Yes - its symmetrical 24mA output drive and matched output impedance allow direct connection to 50Ω transmission lines at frequencies up to ~100MHz, provided CL ≤ 50pF and proper PCB layout (controlled impedance, ground plane). No series termination resistor is needed.
How does the 74AC14TTR differ from standard 74HC14 in noise immunity?
The 74AC14TTR offers higher hysteresis (up to 1.6V vs. 0.9V typical for HC14 at 5V), faster propagation (4.5ns vs. 18ns), and superior ESD rating (2kV vs. 200V HBM), making it significantly more robust against EMI and contact bounce in industrial and automotive settings.
Is the TSSOP-14 package of 74AC14TTR pin-compatible with DIP-14 and SO-14 versions?
Yes - all variants share identical pin numbering and logic function. The TSSOP-14 (74AC14TTR), SO-14 (74AC14MTR), and DIP-14 (74AC14B) are functionally and electrically identical; only mechanical form factor and thermal characteristics differ.
74AC14TTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74AC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8ns @ 5V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
74AC14TTR FAQ
1.How can I place an order for 74AC14TTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC14TTR 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 74AC14TTR reliable?
The price and inventory of 74AC14TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC14TTR is usually 5 days.
3.What payment methods are accepted for 74AC14TTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC14TTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC14TTR?
74AC14TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC14TTR 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 74AC14TTR?
For technical support, including 74AC14TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC14TTR requirements.
6.How does Aetrix verify that 74AC14TTR is sourced from the original manufacturer or authorized distributors?
All 74AC14TTR 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 74AC14TTR meets industry standards.
7.What is the process for return or replacement of 74AC14TTR?
All 74AC14TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC14TTR, 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 74AC14TTR part is unused and in its original packaging.
Return procedure for 74AC14TTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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