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Texas Instruments SN74AHCT14DR
- Part No.:
- SN74AHCT14DR
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AHCT14DR.pdf
- Description:
- IC INVERT SCHMITT 6CH 1IN 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,149
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Product details
Overview
SN74AHCT14DR from Texas Instruments is a commercial-grade hex Schmitt-trigger inverter IC in 14-pin SOIC package, performing six independent Y = A inversion functions with TTL-compatible inputs, 4.5–5.5 V supply operation, and ±8 mA output drive. It enables robust signal conditioning in noisy or slow-rising digital interfaces such as switch debouncing and clock waveform shaping.
For engineers reviewing the SN74AHCT14DR datasheet, SN74AHCT14DR pinout, SN74AHCT14DR application, or SN74AHCT14DR equivalent, key selection criteria include its 1.9 V typical positive-going input threshold (VT+), 0.5 V typical negative-going threshold (VT−), 1.4 V hysteresis at 4.5 V, 8 ns max propagation delay (CL = 15 pF), and ESD robustness exceeding 2000-V HBM - all critical for reliable noise immunity and timing integrity in industrial control and telecom infrastructure.
Technical Context
The SN74AHCT14DR implements six independent CMOS-based Schmitt-trigger inverters, each featuring asymmetric input thresholds to reject noise on slow or degraded signals. Its TTL-voltage-compatible inputs accept 0–5.5 V logic levels regardless of VCC, enabling mixed-voltage interfacing without level shifters.
Each inverter delivers rail-to-rail CMOS outputs with balanced high- and low-drive strength (IOH = –8 mA, IOL = 8 mA at VCC = 4.5 V), supporting fan-out to multiple standard logic loads while maintaining fast edge rates and low dynamic power dissipation (Cpd = 12 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - ensures compatibility with standard 5 V logic systems and tolerance to supply ripple. |
| Input Threshold VT+ | 0.9–1.9 V (typ 1.9 V @ 4.5 V) - defines minimum voltage for clean high-to-low transition, rejecting sub-threshold noise. |
| Input Threshold VT− | 0.5–1.5 V (typ 0.5 V @ 4.5 V) - sets lower switching point, creating hysteresis that prevents chatter on slow edges. |
| Hysteresis ΔVT | 0.4–1.4 V (typ 1.4 V @ 4.5 V) - provides noise margin against transient coupling and ground bounce. |
| Propagation Delay | 1–8 ns (max @ CL = 15 pF) - supports timing-critical applications up to ~125 MHz toggle rate. |
| Output Drive | ±8 mA (min @ VCC = 4.5 V) - drives 10+ 74AHCT inputs or small capacitive loads without external buffers. |
| ESD Rating | 2000-V HBM - meets industrial handling requirements without special ESD controls during assembly. |
| Power Dissipation Cap | 12 pF - enables accurate dynamic power estimation (P = Cpd × V² × f) for thermal design. |
Pinout & Package
SN74AHCT14DR is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012 compliant, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A, 5A, 6A | Input | Six independent Schmitt-trigger input pins accepting TTL-level signals; must be tied to VCC or GND if unused. |
| 1Y, 2Y, 3Y, 4Y, 5Y, 6Y | Output | Six corresponding CMOS-compatible inverted outputs; capable of sourcing/sinking ±8 mA. |
| 7 | GND | Ground reference for all internal circuitry and output return path; requires low-impedance PCB connection. |
| 14 | VCC | Primary power supply pin (4.5–5.5 V); requires local 0.1 µF bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-voltage compatible inputs | Accepts 0–5.5 V input signals independent of VCC, enabling direct interface with legacy 5 V TTL logic families. |
| Schmitt-trigger hysteresis | Guarantees clean, chatter-free transitions on slow or noisy signals (e.g., mechanical switch closures or long traces). |
| Low dynamic power | 12 pF power dissipation capacitance minimizes switching current, reducing heat generation in high-density layouts. |
| High ESD robustness | 2000-V Human-Body Model rating allows safe handling in standard manufacturing environments without extra precautions. |
| Rail-to-rail CMOS outputs | Delivers VOH ≥ 3.8 V and VOL ≤ 0.44 V at 8 mA load, ensuring full logic swing into standard CMOS and TTL loads. |
Applications
| Switch Debouncing | Waveform Shaping |
|---|---|
|
Use Scenario: Mechanical push-button or rotary switch interfacing with microcontroller GPIOs in industrial HMI panels. IC Role / Device Role / Timing Role: SN74AHCT14DR acts as a hardware-level signal conditioner, converting noisy, bouncing switch transitions into clean, monotonic logic edges. Use Value: Eliminates need for software debouncing delays or external RC filters, reducing firmware complexity and improving real-time response. |
Use Scenario: Converting sine-wave oscillator outputs (e.g., crystal or ceramic resonator circuits) into square-wave clocks for digital logic. IC Role / Device Role / Timing Role: SN74AHCT14DR serves as a zero-crossing detector with hysteresis, generating precise, jitter-reduced clock edges from analog waveforms. Use Value: Achieves <1 ns edge jitter improvement over standard inverters, enhancing timing margin in synchronous systems. |
| Digital Noise Filtering | Level Translation Interface |
|
Use Scenario: Cleaning up marginal logic signals from long PCB traces or unshielded cables in network switch backplanes. IC Role / Device Role / Timing Role: SN74AHCT14DR functions as a noise-immune buffer stage, restoring signal integrity before feeding FPGA or ASIC inputs. Use Value: Provides >1.4 V noise margin (ΔVT) to suppress crosstalk-induced glitches that would otherwise cause metastability or false triggering. |
Use Scenario: Interfacing 3.3 V microcontroller outputs to 5 V legacy peripherals in server management subsystems. IC Role / Device Role / Timing Role: SN74AHCT14DR operates as a unidirectional level shifter, leveraging its TTL-compatible inputs to accept 3.3 V logic highs while driving 5 V CMOS outputs. Use Value: Enables interoperability without discrete transistors or dedicated level translators, saving board space and BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Schmitt-trigger inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC14DR | CMOS-input thresholds (VT+ ≈ 3.5 V @ 5 V), no TTL compatibility; lower ICC (1 µA vs 20 µA max), slower propagation (105 ns typ). | Requires clean 5 V input signals; unsuitable for direct TTL or slow-edge sources. | Select when interfacing only with 5 V CMOS and ultra-low static power is critical; avoid for noisy or mixed-voltage systems. |
| MC74VHC14DR2G | Wider supply range (2–5.5 V), higher speed (7.5 ns max), but lower hysteresis (0.9 V typ) and no guaranteed TTL compatibility. | Better for battery-powered 3.3 V systems; less robust against ground bounce in 5 V industrial settings. | Prefer for portable designs needing dual-supply flexibility and faster edges; verify noise immunity with actual layout parasitics. |
Compared with SN74HC14DR and MC74VHC14DR2G, SN74AHCT14DR uniquely combines TTL-level input acceptance, strong 1.4 V hysteresis, and 8 ns speed - making it the optimal choice for legacy 5 V systems requiring noise-hardened signal conditioning without redesigning input drive stages.
Availability
SN74AHCT14DR is available at Aetrix Electronics and suitable for industrial control panels, telecom infrastructure modules, and test-and-measurement equipment requiring stable component supply across extended temperature ranges (–40°C to +125°C) and long production lifecycles.
Supply support for SN74AHCT14DR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience delivering high-reliability logic ICs for industrial and communications markets.
The SN74AHCT14DR belongs to TI's AHCT logic family, engineered specifically for 5 V systems requiring TTL compatibility, Schmitt-trigger noise immunity, and robust performance across commercial temperature grades.
FAQ
What is the maximum operating temperature for SN74AHCT14DR?
The SN74AHCT14DR is rated for operation from –40°C to +125°C, meeting industrial temperature requirements. This specification is confirmed in Section 6.3 (Recommended Operating Conditions) of the official TI datasheet SCLS246T, where TA(MAX) = 125°C is explicitly defined for the commercial-grade SN74AHCT14 series including the DR variant.
Does SN74AHCT14DR support 3.3 V input signals?
Yes, SN74AHCT14DR accepts 3.3 V logic-high inputs reliably because its TTL-compatible inputs have VIH(min) = 2.0 V (typical) and VIL(max) = 0.8 V across the full operating range. At VCC = 5 V, the device guarantees recognition of 3.3 V as a valid high-level input per Section 6.3 of the datasheet.
Can SN74AHCT14DR drive LED indicators directly?
No - SN74AHCT14DR is not designed for direct LED drive. Its absolute maximum output current is ±25 mA per pin, but recommended operating conditions limit IOL/I OH to ±8 mA. Driving even a standard 2 mA LED risks violating output voltage specs (VOL may exceed 0.44 V) and degrades long-term reliability; use a series resistor and external transistor or dedicated LED driver instead.
Is SN74AHCT14DR pin-compatible with SN74HC14DR?
Yes, SN74AHCT14DR and SN74HC14DR share identical 14-pin SOIC (D) packaging and pinout: both follow the standard hex inverter configuration with inputs (1A–6A), outputs (1Y–6Y), VCC (pin 14), and GND (pin 7). This mechanical and functional pin alignment allows direct PCB replacement where electrical characteristics permit.
What decoupling capacitor value is recommended for SN74AHCT14DR?
A 0.1 µF ceramic capacitor is recommended between VCC (pin 14) and GND (pin 7) for SN74AHCT14DR, placed as close as possible to the pins. This value is specified in Section 9.3 (Power Supply Recommendations) of the datasheet to suppress high-frequency supply noise generated by fast CMOS switching transitions.
SN74AHCT14DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- 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:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 8mA, 8mA
- Input Logic Level - Low:
- 0.5V ~ 0.6V
- Input Logic Level - High:
- 1.9V ~ 2.1V
- Max Propagation Delay @ V, Max CL:
- 8ns @ 5V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74AHCT14DR FAQ
1.How can I place an order for SN74AHCT14DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT14DR 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 SN74AHCT14DR reliable?
The price and inventory of SN74AHCT14DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT14DR is usually 5 days.
3.What payment methods are accepted for SN74AHCT14DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT14DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHCT14DR?
SN74AHCT14DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT14DR 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 SN74AHCT14DR?
For technical support, including SN74AHCT14DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT14DR requirements.
6.How does Aetrix verify that SN74AHCT14DR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT14DR 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 SN74AHCT14DR meets industry standards.
7.What is the process for return or replacement of SN74AHCT14DR?
All SN74AHCT14DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT14DR, 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 SN74AHCT14DR part is unused and in its original packaging.
Return procedure for SN74AHCT14DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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