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onsemi MC74ACT14MR1
- Part No.:
- MC74ACT14MR1
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- -
- Datasheet:
-
MC74ACT14MR1.pdf
- Description:
- IC INVERTER
- Quantity:
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- Shipping:
Inventory:17,000
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Product details
Overview
MC74ACT14MR1 from onsemi is a hex Schmitt-trigger inverter IC with TTL-compatible inputs, 5 V supply operation, 24 mA output drive capability, and 1.0 V typical hysteresis-used for noise-immune signal conditioning in digital interface circuits.
For engineers reviewing the MC74ACT14MR1 datasheet, pinout, applications, or equivalent options, key selection criteria include input threshold compatibility with 5 V TTL logic families, guaranteed hysteresis for slow-edge signal cleanup, output sourcing/sinking performance at temperature extremes, and SOIC-14 package suitability for industrial control PCB layouts.
Technical Context
The MC74ACT14MR1 implements six independent Schmitt-trigger inverters with asymmetric input thresholds (Vt+ ≈ 2.0 V, Vt− ≈ 0.8 V at VCC = 4.5 V), enabling reliable waveform shaping of noisy or slowly transitioning signals. Its internal hysteresis is transistor-ratio-based and stable across −40°C to +85°C ambient and 4.5–5.5 V supply range.
Each inverter provides rail-to-rail CMOS output levels with ±24 mA DC drive strength, supports 50 pF load capacitance, and achieves tPLH/tPHL ≤ 12.5 ns/11.0 ns (max) at VCC = 5.0 V, CL = 50 pF. Input leakage remains ≤ ±1.0 µA over full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Hex Schmitt-trigger inverter with TTL-compatible inputs |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures interoperability with standard 5 V TTL and CMOS systems |
| Hysteresis (Typ) | 1.0 V - enables robust noise rejection on slow-rising/falling signals without external components |
| Output Drive | ±24 mA - supports direct driving of multiple 74-series loads or LED indicators |
| Propagation Delay (Max) | 12.5 ns (tPLH) / 11.0 ns (tPHL) - meets timing requirements for 40 MHz+ clock distribution and data synchronization |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments |
| Input Leakage Current | ≤ ±1.0 µA - minimizes loading on high-impedance sensor or potentiometer interfaces |
Pinout & Package
MC74ACT14MR1 is supplied in a 14-lead SOIC (Small Outline Integrated Circuit) package, case 751A, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Input (A1–A6) | Individual Schmitt-trigger input pins accepting TTL-level signals (0.8 V/2.0 V thresholds) |
| 2, 4, 6, 10, 12, 14 | Output (Y1–Y6) | CMOS-compatible inverted outputs capable of sourcing/sinking 24 mA each |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry |
| 14 | VCC | Positive supply terminal - must be decoupled locally with 0.1 µF ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input thresholds | Enables direct interfacing with legacy 74LS/74F logic without level-shifting circuitry |
| Guaranteed hysteresis ≥ 0.4 V | Ensures clean switching even with >100 mV of superimposed noise on input waveforms |
| 24 mA output sink/source | Drives up to 10 LSTTL loads or 20 µA input leakage paths per output without buffering |
| Low quiescent ICC (≤ 40 µA) | Reduces static power consumption in battery-backed or always-on monitoring subsystems |
Applications
| Industrial Sensor Interface | Legacy System Signal Conditioning |
|---|---|
Use Scenario: Cleaning noisy analog switch or mechanical contact bounce signals before feeding into microcontroller GPIO or interrupt lines. IC Role / Device Role / Timing Role: Schmitt-trigger inverter acting as hardware debouncer and edge sharpener. Use Value: Eliminates need for software debouncing routines and reduces MCU interrupt latency jitter by delivering clean, monotonic transitions. | Use Scenario: Interfacing 74LS TTL outputs to modern 5 V CMOS microcontrollers or FPGAs requiring noise-immune inputs. IC Role / Device Role / Timing Role: Level translator and noise filter between mixed-logic-family subsystems. Use Value: Prevents false triggering caused by undershoot/overshoot on long traces, supporting reliable communication in factory automation backplanes. |
| Motor Control Feedback Path | Power Supply Sequencing Monitor |
Use Scenario: Converting slow-rising voltage ramp from motor current sense amplifier into a fast digital enable signal for gate driver shutdown. IC Role / Device Role / Timing Role: Analog-to-digital transition shaper in safety-critical fault detection chain. Use Value: Provides deterministic response time (<13 ns) and immunity to EMI-induced glitches during high-current switching events. | Use Scenario: Monitoring delayed power-good signals from multiple DC/DC converters to generate synchronized reset assertion. IC Role / Device Role / Timing Role: Glitch-free signal combiner and timing aligner for multi-rail sequencing logic. Use Value: Hysteresis prevents oscillation during marginal supply ramp-up, ensuring single, clean reset pulse generation. |
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 |
|---|---|---|---|
| SN74LV14APWR | 3.3 V only operation (1.65–3.6 V); lower drive (±12 mA); no TTL input compatibility | Suitable for low-voltage portable designs but incompatible with 5 V TTL source signals | Select when migrating to 3.3 V systems and replacing legacy 74ACT14 in non-TTL contexts |
| 74HC14D,653 | CMOS-only inputs (no TTL compatibility); higher hysteresis (≈1.5 V typ); same 5 V operation and SOIC-14 package | Accepts only CMOS-level inputs; better noise margin but requires upstream level shifting for TTL sources | Prefer when interfacing exclusively with 5 V CMOS logic and maximum hysteresis is prioritized over TTL compatibility |
Compared with SN74LV14APWR and 74HC14D,653, the MC74ACT14MR1 uniquely supports direct connection to 5 V TTL outputs while maintaining industrial temperature range and 24 mA drive-making it optimal for brownfield industrial upgrades where legacy signal sources remain in place.
Availability
MC74ACT14MR1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, legacy system retrofits, motor control feedback paths, and power supply sequencing monitors requiring stable component supply and long-term manufacturability.
Supply support for MC74ACT14MR1 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 is a global semiconductor supplier focused on energy-efficient innovation, delivering silicon solutions for automotive, industrial, cloud, and IoT applications with emphasis on reliability and sustainability.
The MC74ACT14MR1 belongs to onsemi's legacy FACT (Fairchild Advanced CMOS Technology) logic family, designed specifically for robust signal integrity in mixed-technology industrial control systems where TTL-to-CMOS interfacing and noise immunity are critical.
FAQ
What logic family does the MC74ACT14MR1 belong to, and how does it differ from standard 74AC devices?
The MC74ACT14MR1 belongs to the 74ACT (Advanced CMOS TTL-compatible) logic family. Unlike standard 74AC devices, which accept only CMOS-level inputs, the MC74ACT14MR1 features TTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), allowing direct interfacing with 74LS and other TTL outputs without level shifters. This distinction is explicitly defined in the device's Recommended Operating Conditions and Input Characteristics tables.
Does the MC74ACT14MR1 support operation at 3.3 V?
No, the MC74ACT14MR1 is not rated for 3.3 V operation. Its Recommended Operating Conditions specify a minimum supply voltage of 4.5 V and maximum of 5.5 V. Attempting to operate the MC74ACT14MR1 at 3.3 V may result in undefined input thresholds, degraded noise margin, and unreliable output switching. For 3.3 V systems, consider the SN74LV14A or 74LVC14 series instead.
What is the guaranteed hysteresis range for the MC74ACT14MR1 across temperature and voltage?
The MC74ACT14MR1 guarantees a minimum hysteresis of 0.4 V and maximum of 1.6 V across −40°C to +85°C and 4.5–5.5 V supply, per the INPUT CHARACTERISTICS table. Typical hysteresis is 1.0 V at VCC = 4.5 V. This internally generated hysteresis is process-ratio-based and intentionally insensitive to supply and temperature variation-ensuring consistent noise rejection in demanding environments.
Can the MC74ACT14MR1 drive a 50 pF capacitive load reliably at full speed?
Yes, the MC74ACT14MR1 is fully characterized for 50 pF load capacitance, with AC specifications (tPLH, tPHL) guaranteed up to 12.5 ns/11.0 ns max at VCC = 5.0 V and TA = −40°C to +85°C. The device's 24 mA output drive strength and low output impedance ensure stable edge rates into this load, as confirmed in the AC CHARACTERISTICS section of the official datasheet.
Is the MC74ACT14MR1 pin-compatible with the MC74AC14MR1?
Yes, the MC74ACT14MR1 and MC74AC14MR1 share identical pinout, package (SOIC-14), and functional assignment-both contain six Schmitt-trigger inverters in the same 14-pin layout. However, they differ electrically: MC74AC14MR1 uses CMOS-only inputs (VIL/VIH referenced to VCC), while MC74ACT14MR1 provides TTL-compatible inputs. Swapping them requires verifying input signal levels in the target system.
MC74ACT14MR1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- -
MC74ACT14MR1 FAQ
1.How can I place an order for MC74ACT14MR1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74ACT14MR1 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 MC74ACT14MR1 reliable?
The price and inventory of MC74ACT14MR1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74ACT14MR1 is usually 5 days.
3.What payment methods are accepted for MC74ACT14MR1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74ACT14MR1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74ACT14MR1?
MC74ACT14MR1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74ACT14MR1 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 MC74ACT14MR1?
For technical support, including MC74ACT14MR1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74ACT14MR1 requirements.
6.How does Aetrix verify that MC74ACT14MR1 is sourced from the original manufacturer or authorized distributors?
All MC74ACT14MR1 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 MC74ACT14MR1 meets industry standards.
7.What is the process for return or replacement of MC74ACT14MR1?
All MC74ACT14MR1 units undergo pre-shipment inspection (PSI). If there is an issue with MC74ACT14MR1, 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 MC74ACT14MR1 part is unused and in its original packaging.
Return procedure for MC74ACT14MR1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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