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NXP Semiconductors 74AHC244D,112
- Part No.:
- 74AHC244D,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AHC244D,112.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:12,422
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Product details
Overview
74AHC244D,112 from Nexperia is an octal 3-state buffer/line driver in SO20 package, designed for bidirectional bus interfacing and voltage-level translation in mixed-supply systems. It features two independent 4-bit sections (1A0–1A3/1Y0–1Y3 and 2A0–2A3/2Y0–2Y3), dual active-low output enables (1OE, 2OE), CMOS input thresholds, and overvoltage-tolerant inputs up to 5.5 V. Operates from 2.0 V to 5.5 V with propagation delay as low as 3.4 ns at 5 V and 15 pF load.
For engineers reviewing the 74AHC244D,112 datasheet, 74AHC244D,112 pinout, 74AHC244D,112 application, or 74AHC244D,112 equivalent, this device is selected for high-speed digital bus buffering, level-shifting between 3.3 V and 5 V domains, and noise-immune signal conditioning in industrial control and embedded I/O expansion circuits.
Technical Context
The 74AHC244D,112 implements two independent 4-bit non-inverting buffer groups, each controlled by a dedicated active-low output enable (1OE, 2OE). Its Schmitt-trigger inputs provide hysteresis for noisy signal environments, while overvoltage tolerance allows safe interfacing with 5 V signals even when powered at 3.3 V.
It operates across -40 °C to +125 °C with static VIH/VIL thresholds defined for 2.0–5.5 V supply (e.g., VIH = 3.85 V min at VCC = 5.5 V), and dynamic performance characterized at CL = 15 pF and 50 pF loads. Propagation delay (tpd) and enable/disable timing are fully specified across voltage and temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 5.5 V - supports direct integration into both 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay | 3.4 ns (typ) at VCC = 5.0 V, CL = 15 pF - enables reliable operation in ≥100 MHz bus systems with tight timing margins. |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - permits safe connection to higher-voltage buses (e.g., legacy 5 V peripherals) while powered at 3.3 V. |
| Output Drive | ±8 mA at VCC = 4.5 V - sufficient to drive standard TTL/CMOS loads and moderate PCB trace capacitance. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive modules, industrial PLCs, and high-ambient embedded controllers. |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces risk of field failure during handling and system integration. |
| Power Dissipation | 500 mW max (SO20) - thermally viable for continuous operation in compact enclosures with natural convection cooling. |
Pinout & Package
74AHC244D,112 uses the SOT163-1 (SO20) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm lead pitch, gull-wing leads. Pin 1 is marked by notch or dot; pin 10 is GND, pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls four outputs per section; LOW enables buffer, HIGH places outputs in high-impedance state. |
| 2, 4, 6, 8 | 1A0–1A3 | First group of four data inputs feeding corresponding 1Yn outputs. |
| 17, 15, 13, 11 | 2A0–2A3 | Second group of four data inputs feeding corresponding 2Yn outputs. |
| 18, 16, 14, 12 | 1Y0–1Y3 | Non-inverting buffered outputs for first input group; 3-state capable. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Non-inverting buffered outputs for second input group; 3-state capable. |
| 10 | GND | Ground reference for all internal circuitry and I/O; must be connected to system 0 V plane. |
| 20 | VCC | Primary power supply input; decoupling capacitor (100 nF) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2.0 V to 5.5 V operation eliminates need for separate voltage rails in mixed-signal boards. |
| Schmitt-trigger inputs | Hysteresis on all inputs rejects noise spikes up to 0.5 V, improving reliability in electrically noisy industrial environments. |
| Overvoltage-tolerant inputs | Accepts 0–5.5 V input signals independent of VCC - enables direct connection to 5 V microcontrollers driving 3.3 V FPGAs. |
| High noise immunity | CMOS input structure with >40 % noise margin at VCC = 5 V ensures robust operation near switching power supplies or motor drivers. |
| Low power dissipation | ICC ≤ 4 μA typical at VCC = 5.5 V and static conditions - extends battery life in always-on sensor interface modules. |
Applications
| Industrial Bus Interface | Microcontroller I/O Expansion |
|---|---|
|
Use Scenario: Isolating and driving RS-485 transceiver control lines and status indicators in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer isolating MCU GPIO from noisy field-side circuitry while enabling shared bus access. Use Value: Prevents back-driving and contention during hot-swap events; overvoltage tolerance protects against induced transients on long cable runs. |
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive 16-channel LED matrix and keypad scan lines. IC Role / Device Role / Timing Role: Level-translating buffer translating 3.3 V MCU outputs to 5 V LED sink drivers and 5 V keypad pull-ups. Use Value: Eliminates discrete level-shifters; Schmitt-trigger inputs reject contact bounce noise from mechanical keypresses. |
| Memory Address Latching | Legacy Peripheral Interfacing |
|
Use Scenario: Driving address lines to parallel SRAM and flash memory in a retro-computing FPGA-based system. IC Role / Device Role / Timing Role: Low-skew octal buffer ensuring simultaneous valid address setup across 8-bit memory bus segments. Use Value: 3.4 ns tpd at 5 V meets 20 MHz SRAM access timing; balanced rise/fall delays minimize address skew. |
Use Scenario: Interfacing modern 3.3 V SoC with legacy 5 V UART peripherals and parallel printer ports. IC Role / Device Role / Timing Role: Voltage-tolerant buffer allowing 5 V peripheral signals to safely enter 3.3 V domain without external clamping. Use Value: Removes need for external diode/resistor networks; enables drop-in replacement in existing 5 V designs upgrading to lower-voltage cores. |
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 |
|---|---|---|---|
| 74AHCT244D,112 | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and DC specs except input threshold. | Better suited for interfacing with legacy 5 V TTL logic families where AHC's CMOS thresholds may cause marginal recognition. | Select when driving from 5 V TTL sources; otherwise prefer AHC for lower power and wider VCC range. |
| SN74LVC244APWR | Lower VCC range (1.65–3.6 V); 3.3 V only; 24 mA drive; different pinout (TSSOP20). | Optimized for modern low-voltage systems; not suitable for 5 V operation or direct pin replacement. | Choose only for new 3.3 V-only designs requiring higher drive strength; requires PCB redesign. |
Compared with 74AHCT244D,112, the 74AHC244D,112 offers superior voltage flexibility and lower static current but requires CMOS-compatible input sources; versus SN74LVC244APWR, it supports full 5 V interoperability but delivers less output current and targets broader industrial temperature use.
Availability
74AHC244D,112 is available at Aetrix Electronics and suitable for industrial automation, embedded I/O expansion, and mixed-voltage bus interfacing requiring stable component supply across extended temperature ranges.
Supply support for 74AHC244D,112 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 logic, analog, and MOSFET solutions with focus on efficiency, reliability, and sustainability.
The 74AHC244D,112 belongs to Nexperia's advanced high-speed CMOS logic family, engineered for robust signal integrity and wide-voltage interoperability in industrial, automotive, and computing infrastructure applications.
FAQ
Can 74AHC244D,112 operate reliably at 2.0 V supply?
Yes. The device is fully specified down to 2.0 V: VIH = 1.5 V min, VOL = 0.5 V max at 4 mA load, and tpd ≤ 10.5 ns (max) at CL = 15 pF. This enables compatibility with ultra-low-power microcontrollers and battery-powered sensors operating at minimum core voltage.
What is the maximum capacitive load the outputs can drive?
The outputs are characterized up to 50 pF load in datasheet Table 7, with tpd = 7.5 ns (max) and tdis = 11.5 ns (max) at VCC = 5.5 V. For loads exceeding 50 pF, propagation delay increases linearly; design margin requires derating based on measured board capacitance and timing budget.
Is thermal pad connection required for SO20 package?
No. The SOT163-1 (SO20) package has no exposed thermal pad. Thermal performance relies on copper pour under pins 10 (GND) and 20 (VCC), with recommended 100 mm² minimum 2-oz copper area connected via multiple vias for Ptot = 500 mW operation at +125 °C ambient.
How does overvoltage tolerance work on the inputs?
Inputs tolerate up to 5.5 V regardless of VCC due to integrated clamping structures. When VI exceeds VCC + 0.5 V or falls below -0.5 V, internal diodes conduct, limiting current to ±20 mA (per IOK spec). External series resistors ≥1 kΩ are recommended for sustained overvoltage conditions.
74AHC244D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74AHC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74AHC244D,112 FAQ
1.How can I place an order for 74AHC244D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHC244D,112 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 74AHC244D,112 reliable?
The price and inventory of 74AHC244D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHC244D,112 is usually 5 days.
3.What payment methods are accepted for 74AHC244D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHC244D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHC244D,112?
74AHC244D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHC244D,112 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 74AHC244D,112?
For technical support, including 74AHC244D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHC244D,112 requirements.
6.How does Aetrix verify that 74AHC244D,112 is sourced from the original manufacturer or authorized distributors?
All 74AHC244D,112 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 74AHC244D,112 meets industry standards.
7.What is the process for return or replacement of 74AHC244D,112?
All 74AHC244D,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHC244D,112, 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 74AHC244D,112 part is unused and in its original packaging.
Return procedure for 74AHC244D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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