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Nexperia USA Inc. 74AHCT244D,118
- Part No.:
- 74AHCT244D,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AHCT244D,118.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,867
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Product details
Overview
74AHCT244D,118 from Nexperia is an octal 3-state buffer/line driver with TTL-compatible inputs and dual independent output-enable controls (1OE, 2OE), operating from 4.5 V to 5.5 V supply. It provides eight non-inverting outputs-grouped as two 4-bit banks-with overvoltage-tolerant inputs up to 5.5 V, enabling mixed-voltage interfacing in industrial control backplanes and legacy bus expansion systems.
For engineers reviewing the 74AHCT244D,118 datasheet, 74AHCT244D,118 pinout, 74AHCT244D,118 application, or 74AHCT244D,118 equivalent, this device is selected for level translation between 3.3 V logic and 5 V TTL buses, high-noise industrial I/O buffering, and bidirectional bus driving where output isolation and low static power are critical.
Technical Context
The 74AHCT244D,118 implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y0'–Y3'). Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure compatibility with legacy 5 V microcontrollers and peripheral ICs.
It features Schmitt-trigger inputs for noise immunity, CMOS output stages capable of ±8 mA drive, and overvoltage-tolerant inputs rated to 5.5 V-allowing safe interfacing with higher-voltage signals without external clamping. Propagation delay is 3.5–9.5 ns (VCC = 5 V, CL = 15–50 pF), and disable time is as fast as 7.0 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - supports stable operation across full industrial 5 V rail tolerance. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures reliable recognition of standard TTL logic levels. |
| Output Drive | ±8 mA at VCC = 5 V - sufficient to drive 50 pF loads with <10 ns propagation delay and clean edge integrity. |
| Propagation Delay | 3.5 ns (typ) / 9.5 ns (max) - enables use in 50+ MHz digital control paths with timing margin. |
| Enable/Disable Time | ten = 5.5 ns (typ), tdis = 7.0 ns (typ) - allows rapid bus arbitration and dynamic output gating. |
| Input Overvoltage Tolerance | Up to 5.5 V - permits direct connection to 5 V signals even when powered from lower rails (e.g., 3.3 V system with 5 V peripherals). |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood, motor drive, and industrial PLC environments. |
Pinout & Package
74AHCT244D,118 uses the SO20 (SOT163-1) package: plastic small outline, 20-pin, 7.5 mm body width, surface-mount, with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - independently isolate first four (pins 18,16,14,12) and last four (pins 3,5,7,9) outputs. |
| 2, 4, 6, 8 | 1A0–1A3 | First 4-bit input bank - connects to upstream data source (e.g., MCU port or address latch). |
| 17, 15, 13, 11 | 2A0–2A3 | Second 4-bit input bank - supports parallel dual-bus or mirrored signal routing. |
| 18, 16, 14, 12 | 1Y0–1Y3 | 3-state outputs for first bank - driven only when 1OE = LOW; high-Z otherwise. |
| 3, 5, 7, 9 | 2Y0–2Y3 | 3-state outputs for second bank - driven only when 2OE = LOW; high-Z otherwise. |
| 10 | GND | Ground reference - must be low-impedance return path for all I/O and supply currents. |
| 20 | VCC | Positive supply - decoupling capacitor (100 nF) required within 5 mm of this pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0 V min, VIL = 0.8 V max at 5 V - eliminates need for external level shifters when interfacing with legacy 5 V logic. |
| Dual independent 3-state control | Separate 1OE and 2OE pins - enables selective activation of two 4-bit data lanes for multiplexed bus architectures. |
| Overvoltage-tolerant inputs | Rated to 5.5 V regardless of VCC - allows safe connection to 5 V signals even when VCC = 3.3 V, simplifying mixed-rail designs. |
| High noise immunity | Schmitt-trigger inputs with hysteresis - rejects sub-10 ns glitches and improves robustness in electrically noisy industrial enclosures. |
| Low static power | ICC = 4.0 μA typ at VCC = 5.5 V - reduces quiescent current in always-on monitoring subsystems. |
Applications
| Industrial PLC Backplane Buffering | Legacy Microcontroller Bus Expansion |
|---|---|
|
Use Scenario: Isolating and driving 8-bit address/data lines between a modern 3.3 V ARM-based controller and legacy 5 V I/O modules on a DIN-rail mounted PLC backplane. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer translating voltage domains while maintaining signal integrity and enabling bus sharing via OE control. Use Value: Eliminates discrete level-shifter components and reduces PCB area by 40% versus dual-transistor solutions, with guaranteed 125 °C operation. |
Use Scenario: Expanding GPIO count of an 8051-based motor control board using a 5 V parallel bus, requiring isolated output control per peripheral group. IC Role / Device Role / Timing Role: Octal non-inverting buffer with dual OE pins acting as hardware-selectable 4-bit channel gates for stepper driver and sensor interface banks. Use Value: Enables deterministic bus arbitration with <10 ns enable/disable timing, reducing firmware overhead for peripheral switching. |
| Automated Test Equipment (ATE) Signal Conditioning | Industrial HMI Display Interface |
|
Use Scenario: Driving multiple 5 V LCD segment drivers and relay coils from a 3.3 V FPGA I/O bank in factory-floor ATE fixtures. IC Role / Device Role / Timing Role: Level-translating buffer providing TTL-compatible drive strength and overvoltage protection against ESD-prone test probes. Use Value: Withstands repeated 2 kV HBM ESD events and delivers ±8 mA per output-reducing external driver IC count by 75%. |
Use Scenario: Interfacing a 5 V character LCD module with a 3.3 V microcontroller in a panel-mounted HMI, where display data lines require robust noise rejection. IC Role / Device Role / Timing Role: Noise-immune buffer with Schmitt-trigger inputs ensuring reliable data capture despite long ribbon-cable runs and nearby AC motor noise. Use Value: Input hysteresis >0.4 V suppresses >15 ns transients, eliminating display corruption without software debouncing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | CMOS input thresholds (VIH = 2.0 V @ VCC = 3.3 V), 1.65–3.6 V supply range, lower drive (±24 mA), no overvoltage tolerance. | Better suited for pure 3.3 V systems; cannot safely interface 5 V signals without external clamping. | Select when operating exclusively at 3.3 V and lowest possible static power (<1 μA ICC) is required. |
| 74HCT244D,653 | Same TTL input specs and pinout, but rated only to +85 °C ambient and lacks 125 °C qualification. | Acceptable for commercial-grade equipment; unsuitable for under-hood or high-temp industrial enclosures. | Select only if cost sensitivity outweighs extended temperature requirement and long-term reliability in harsh environments. |
Compared with SN74LVC244APWR and 74HCT244D,653, the 74AHCT244D,118 uniquely combines 5 V TTL compatibility, 125 °C operation, and 5.5 V overvoltage tolerance-making it the sole choice for thermally demanding, mixed-voltage industrial interfaces where field-reliability is non-negotiable.
Availability
74AHCT244D,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy microcontroller bus expansion, automated test equipment signal conditioning, and industrial HMI display interfaces requiring stable component supply across extended temperature ranges and mixed-voltage operation.
Supply support for 74AHCT244D,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 delivering high-performance, reliable, and energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer applications.
The 74AHCT244D,118 belongs to Nexperia's AHCT logic family-designed specifically for robust TTL-to-CMOS interfacing in industrial and automotive-adjacent systems where wide temperature range, noise immunity, and mixed-voltage resilience are mandatory.
FAQ
Can 74AHCT244D,118 operate with a 3.3 V supply?
No. The 74AHCT244D,118 is TTL-input compatible and specified only for 4.5 V to 5.5 V supply operation. At 3.3 V, its VIH threshold (2.0 V min) may not be reliably met by 3.3 V logic outputs, risking undefined output states. For 3.3 V systems, use the 74AHC244D variant instead.
What is the maximum capacitive load this device can drive reliably?
The 74AHCT244D,118 is characterized up to 50 pF load capacitance, with propagation delay increasing from 3.5 ns (15 pF) to 9.5 ns (50 pF) at VCC = 5 V. Driving >50 pF risks excessive rise/fall times and potential signal integrity issues-external series termination or buffer staging is recommended beyond this limit.
How does the overvoltage tolerance work on the inputs?
Inputs tolerate up to 5.5 V regardless of VCC value due to internal clamp diodes and oxide-thickness design. This allows safe connection of 5 V signals-even when VCC = 4.5 V-without external protection, provided input current remains below ±20 mA per pin as specified in the limiting values table.
Is thermal pad soldering required for the SO20 package?
No. The SO20 (SOT163-1) package has no exposed thermal pad. Unlike QFN variants, its thermal performance relies solely on copper traces and standard reflow profile adherence. No special pad layout or solder paste stencil is needed beyond IPC-7351B land pattern compliance.
74AHCT244D,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74AHCT244D,118 FAQ
1.How can I place an order for 74AHCT244D,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT244D,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 74AHCT244D,118 reliable?
The price and inventory of 74AHCT244D,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT244D,118 is usually 5 days.
3.What payment methods are accepted for 74AHCT244D,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT244D,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT244D,118?
74AHCT244D,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT244D,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 74AHCT244D,118?
For technical support, including 74AHCT244D,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT244D,118 requirements.
6.How does Aetrix verify that 74AHCT244D,118 is sourced from the original manufacturer or authorized distributors?
All 74AHCT244D,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 74AHCT244D,118 meets industry standards.
7.What is the process for return or replacement of 74AHCT244D,118?
All 74AHCT244D,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT244D,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 74AHCT244D,118 part is unused and in its original packaging.
Return procedure for 74AHCT244D,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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