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onsemi 74ACTQ14SCX
- Part No.:
- 74ACTQ14SCX
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74ACTQ14SCX.pdf
- Description:
- IC INVERT SCHMITT 6CH 1IN 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,333
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Product details
Overview
74ACTQ14SCX from Fairchild Semiconductor is a hex inverter IC with Schmitt-trigger inputs, designed for noise-immune signal conditioning in digital logic interfaces. It features 14-pin SOIC packaging, 5V supply operation (4.5–5.5V), ±24 mA output drive, 1.0V typical hysteresis, and guaranteed simultaneous switching noise suppression via Quiet Series™ technology. It is used in industrial control input debouncing and legacy TTL/CMOS level translation.
For engineers reviewing the 74ACTQ14SCX datasheet, pinout, applications, or equivalent options, key selection criteria include Schmitt-trigger hysteresis width, dynamic noise voltage limits (VOLP ≤ 1.5 V, VOLV ≥ −1.2 V), AC propagation delay (tPLH/tPHL ≤ 11 ns), output skew (tOSHL/tOSLH ≤ 1.0 ns), and latch-up immunity (±300 mA).
Technical Context
The 74ACTQ14SCX implements six independent Schmitt-trigger inverters with internally set hysteresis (Vt+ = 2.0 V, Vt− = 0.8 V at VCC = 5.5 V), enabling clean edge regeneration of slow or noisy signals. Its Quiet Series™ architecture integrates GTO™ output control and undershoot correction with a split ground bus to suppress simultaneous switching noise.
It operates across −40°C to +85°C with guaranteed DC performance: VIH = 2.0 V min, VIL = 0.8 V max, VOH = 4.4 V min at −24 mA, VOL = 0.44 V max at 24 mA. AC timing is specified at CL = 50 pF and f = 1 MHz, with propagation delays tightly controlled to minimize inter-output skew.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems and tolerance to supply ripple. |
| Hysteresis Width | 0.4 V to 1.6 V - Provides robust noise margin against EMI-induced false triggering on slow-rising inputs. |
| Output Drive | ±24 mA - Supports direct interface to multiple 74-series loads or LED indicators without external buffers. |
| Propagation Delay | ≤11 ns at CL = 50 pF - Enables reliable timing in high-speed control logic up to ~50 MHz toggle rate. |
| Simultaneous Switching Noise | VOLP ≤ 1.5 V, VOLV ≥ −1.2 V - Limits ground bounce and crosstalk during multi-output transitions. |
| Input Leakage | ±1.0 µA max - Minimizes loading on high-impedance sensor or potentiometer sources. |
| Operating Temp | −40°C to +85°C - Qualified for industrial environments including motor drives and PLC I/O modules. |
Pinout & Package
74ACTQ14SCX is housed in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-120, 0.150″ narrow body (Package Number M14A), with standard 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Inverting Input (A1–A6) | Schmitt-trigger input pins accepting slow or noisy waveforms; each has independent hysteresis threshold. |
| 2, 4, 6, 8, 10, 12 | Inverting Output (Y1–Y6) | Active-low CMOS outputs capable of sourcing/sinking 24 mA; GTO™-controlled for quiet switching. |
| 7 | GND | Dedicated ground reference for logic core; split-bus design isolates noise from output switching paths. |
| 14 | VCC | Positive supply rail; decoupling required within 1 cm due to high di/dt during simultaneous switching. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger input hysteresis | Internally trimmed to 0.4–1.6 V range, stable over temperature and supply voltage - eliminates need for external RC networks in debouncing. |
| Quiet Series™ noise suppression | GTO™ output control + undershoot corrector + split ground bus - reduces dynamic ground bounce by >50% vs. standard ACT devices. |
| Guaranteed pin-to-pin skew | tOSHL/tOSLH ≤ 1.0 ns - ensures deterministic timing alignment across all six outputs for synchronous sampling. |
| Latch-up immunity | ±300 mA - withstands transient overcurrent events common in industrial I/O interfacing without destructive failure. |
| ICC reduction | 50% lower quiescent current vs. baseline ACT14 - extends power budget in battery-backed or low-power standby modes. |
Applications
| Industrial Pushbutton Debouncing | Legacy Bus Signal Conditioning |
|---|---|
Use Scenario: Mechanical pushbuttons in factory HMIs generate contact bounce lasting 5–20 ms; raw signals cause spurious interrupts in microcontrollers. IC Role / Device Role / Timing Role: 74ACTQ14SCX acts as a hardware-level edge cleaner, converting noisy switch closures into clean, jitter-free logic transitions. Use Value: Eliminates need for software debouncing delays or external RC filters, reducing MCU firmware complexity and improving real-time response. | Use Scenario: Older 5 V TTL or LVTTL buses (e.g., ISA, GPIB) exhibit slow rise/fall times and noise susceptibility when interfaced with modern controllers. IC Role / Device Role / Timing Role: 74ACTQ14SCX serves as a Schmitt-trigger buffer stage, restoring sharp edges and rejecting line noise before data capture. Use Value: Enables reliable communication with legacy equipment without redesigning bus termination or adding active repeaters. |
| Motor Control Feedback Filtering | Power Supply Sequencing Monitor |
Use Scenario: Hall-effect or optical encoder signals in BLDC motor drives contain EMI-induced glitches near commutation edges. IC Role / Device Role / Timing Role: 74ACTQ14SCX conditions encoder quadrature A/B channels, ensuring glitch-free state decoding by the motor controller. Use Value: Prevents position miscounting and torque ripple caused by false zero-crossing detection in noisy electrical environments. | Use Scenario: Multi-rail power supplies (e.g., 5 V, 3.3 V, 1.8 V) require precise sequencing; supervisor ICs monitor enable lines prone to noise during startup. IC Role / Device Role / Timing Role: 74ACTQ14SCX buffers and cleans power-good signals before feeding them to FPGA configuration logic or reset controllers. Use Value: Guarantees deterministic system initialization by eliminating metastability from noisy rail-monitoring outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex inverter with Schmitt-trigger input applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT14DR | No Quiet Series™ noise suppression; no GTO™ or undershoot correction; higher simultaneous switching noise (VOLP up to 2.5 V). | Suitable for low-noise board layouts but not recommended where multiple outputs switch concurrently near sensitive analog circuits. | Select when cost is prioritized over noise immunity and layout constraints allow tight decoupling and ground isolation. |
| MC74VHC14DT | Higher VCC range (2–5.5 V); lower drive (±8 mA); hysteresis narrower (0.3–0.9 V); no split ground or GTO™. | Better for mixed-voltage systems and ultra-low-power sleep modes, but insufficient for driving heavy capacitive loads or noisy industrial I/O. | Select when operating below 3.3 V or integrating into battery-powered portable instrumentation with minimal switching activity. |
Compared with SN74ACT14DR and MC74VHC14DT, the 74ACTQ14SCX uniquely delivers guaranteed low-noise switching under full-load simultaneous output transitions - critical for industrial PLC backplanes and motor drive feedback paths where ground bounce must be bounded to <1.5 V.
Availability
74ACTQ14SCX is available at Aetrix Electronics and suitable for industrial automation, motor control, and legacy system integration requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 74ACTQ14SCX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, analog, and logic ICs before its acquisition by ON Semiconductor in 2016.
The 74ACTQ14SCX belongs to the ACTQ Quiet Series™ logic family, engineered specifically for high-noise industrial and automotive environments where signal integrity during simultaneous switching is mission-critical.
FAQ
What is the maximum hysteresis voltage specification for the 74ACTQ14SCX?
The 74ACTQ14SCX guarantees a minimum hysteresis of 0.4 V and a maximum of 1.6 V across the full operating temperature and supply range (−40°C to +85°C, VCC = 4.5–5.5 V). This wide, stable hysteresis window ensures reliable noise rejection even under worst-case voltage and thermal conditions, making the 74ACTQ14SCX especially effective in electrically harsh industrial settings.
Does the 74ACTQ14SCX support 3.3 V operation?
No, the 74ACTQ14SCX is not rated for 3.3 V operation. Its absolute minimum VCC is 4.5 V, and recommended operating range is strictly 4.5 V to 5.5 V. Attempting to operate the 74ACTQ14SCX at 3.3 V will result in undefined logic thresholds, degraded noise margins, and potential functional failure. For 3.3 V systems, consider alternatives like MC74VHC14DT.
What does "Quiet Series™" mean for the 74ACTQ14SCX?
"Quiet Series™" refers to Fairchild's proprietary noise-suppression architecture integrated into the 74ACTQ14SCX, comprising GTO™ output control, an undershoot corrector circuit, and a physically split ground bus. These features collectively reduce dynamic ground bounce and output voltage overshoot during simultaneous switching - verified by measured VOLP ≤ 1.5 V and VOLV ≥ −1.2 V - distinguishing the 74ACTQ14SCX from standard ACT inverters.
Can the 74ACTQ14SCX drive a 50 pF load with guaranteed timing?
Yes, the 74ACTQ14SCX AC specifications are explicitly characterized at CL = 50 pF, with tPLH and tPHL guaranteed ≤ 11 ns over temperature and voltage. The device's ±24 mA drive strength ensures stable edge rates into this load, and its Quiet Series™ design prevents timing degradation caused by supply rail disturbance - a key advantage over non-quiet logic families under identical test conditions.
Is the 74ACTQ14SCX pin-compatible with standard 74ACT14 packages?
Yes, the 74ACTQ14SCX uses the same 14-pin SOIC footprint (JEDEC MS-120, Package Number M14A) as the 74ACT14 and other industry-standard hex inverters. Pin assignments - including inputs (1,3,5,9,11,13), outputs (2,4,6,8,10,12), VCC (14), and GND (7) - are identical. However, due to internal Quiet Series™ enhancements, PCB layout best practices (e.g., local decoupling, ground plane integrity) should still be followed to realize full noise-performance benefits.
74ACTQ14SCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ACTQ
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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):
- 2 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 10ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
74ACTQ14SCX FAQ
1.How can I place an order for 74ACTQ14SCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ACTQ14SCX 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 74ACTQ14SCX reliable?
The price and inventory of 74ACTQ14SCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ACTQ14SCX is usually 5 days.
3.What payment methods are accepted for 74ACTQ14SCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ACTQ14SCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ACTQ14SCX?
74ACTQ14SCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ACTQ14SCX 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 74ACTQ14SCX?
For technical support, including 74ACTQ14SCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ACTQ14SCX requirements.
6.How does Aetrix verify that 74ACTQ14SCX is sourced from the original manufacturer or authorized distributors?
All 74ACTQ14SCX 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 74ACTQ14SCX meets industry standards.
7.What is the process for return or replacement of 74ACTQ14SCX?
All 74ACTQ14SCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ACTQ14SCX, 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 74ACTQ14SCX part is unused and in its original packaging.
Return procedure for 74ACTQ14SCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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