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NXP Semiconductors 74AHCT244D,112
- Part No.:
- 74AHCT244D,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74AHCT244D,112.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:5,195
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Product details
Overview
74AHCT244D,112 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 bidirectional data paths split into two groups of four, supports mixed-voltage interfacing via overvoltage-tolerant inputs up to 5.5 V, and delivers propagation delay as low as 3.5 ns at 5 V with 15 pF load - used in bus buffering, address/data isolation, and level translation in industrial microcontroller systems.
For engineers reviewing the 74AHCT244D,112 datasheet, 74AHCT244D,112 pinout, 74AHCT244D,112 application, or 74AHCT244D,112 equivalent, this device is selected for its TTL-level input compatibility, SO20 package thermal robustness, -40 °C to +125 °C operation, and precise enable-controlled tri-state behavior in high-noise embedded control buses.
Technical Context
The 74AHCT244D,112 implements two independent 4-bit non-inverting buffers, each gated by a dedicated active-low output-enable input (1OE for Y0–Y3, 2OE for Y4–Y7). Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure reliable interfacing with legacy 5 V logic families while maintaining CMOS power efficiency.
Each output drives ±8 mA at VCC = 4.5 V, supports 15–50 pF capacitive loads, and transitions between active and high-impedance states within 3.5–14.5 ns (enable/disable times). Input Schmitt-trigger action is not present - only standard TTL-compliant input hysteresis per JEDEC JESD8-12.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and mixed-supply systems without level shifters. |
| Input Logic Type | TTL-level - VIH ≥ 2.0 V, VIL ≤ 0.8 V enables direct connection to 74LS/74F outputs without pull-ups. |
| Propagation Delay | 3.5 ns (typ) at VCC = 5 V, CL = 15 pF - supports >100 MHz bus toggle rates in buffered address/data paths. |
| Output Drive | ±8 mA at VCC = 4.5 V - sufficient to drive 50 Ω transmission lines or 10 LSTTL loads under worst-case conditions. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive ECUs, industrial PLC backplanes, and high-ambient motor drives. |
| Input Overvoltage Tolerance | Up to 5.5 V - allows safe interfacing with 5 V signals even when VCC = 4.5 V, eliminating external clamping diodes. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - meets IEC 61000-4-2 Level 3 requirements for board-level ESD immunity. |
Pinout & Package
74AHCT244D,112 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads, rated for reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - independently disable Group 1 (pins 18,16,14,12) or Group 2 (pins 3,5,7,9). |
| 2,4,6,8 | 1A0–1A3 | Group 1 input data lines - connect to MCU port bits or address bus lower nibble. |
| 17,15,13,11 | 2A0–2A3 | Group 2 input data lines - route to peripheral control signals or upper address bits. |
| 18,16,14,12 | 1Y0–1Y3 | Group 1 true-buffered outputs - drive local bus segments with controlled slew and noise immunity. |
| 3,5,7,9 | 2Y0–2Y3 | Group 2 true-buffered outputs - isolate high-speed peripherals from main system bus during standby. |
| 10 | GND | Signal ground reference - must be low-inductance plane connection to minimize switching noise coupling. |
| 20 | VCC | Positive supply - requires local 100 nF ceramic decoupling adjacent to pin 20 per high-frequency current demand. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 4.5–5.5 V operation - eliminates need for separate 5 V regulators in mixed-voltage designs. |
| Dual independent OE control | Two active-low enables (1OE, 2OE) - enables selective bus arbitration without software overhead or external logic. |
| Overvoltage-tolerant inputs | Inputs withstand 5.5 V regardless of VCC - permits hot-swap insertion and 5 V signal injection into partially powered systems. |
| High noise immunity | CMOS input structure with 0.4 V typical noise margin at VCC = 5 V - suppresses false triggering in electrically noisy motor control environments. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level A - prevents destructive latch-up during transient overvoltage events on I/O lines. |
Applications
| Industrial PLC Backplane Buffering | Automotive ECU Address Bus Isolation |
|---|---|
|
Use Scenario: Isolating CPU address lines from multiple peripheral modules on a shared backplane to prevent signal contention and reduce capacitive loading. IC Role / Device Role / Timing Role: Octal non-inverting buffer with independent group enables - selectively activates/deactivates address segments during module access cycles. Use Value: Enables deterministic timing with 3.5 ns propagation delay and eliminates bus turnaround delays caused by uncontrolled leakage paths. |
Use Scenario: Driving CAN controller and sensor interface address/data lines in engine control units where ambient temperature reaches 125 °C. IC Role / Device Role / Timing Role: High-temperature-rated 3-state buffer - isolates microcontroller pins during sleep mode while maintaining 5 V signal integrity. Use Value: Guarantees reliable tri-state behavior across full -40 °C to +125 °C range, preventing phantom bus activity during low-power states. |
| Legacy 5 V Microcontroller Bus Expansion | Mixed-Voltage Level Translation |
|
Use Scenario: Expanding GPIO count of 8051 or PIC18F microcontrollers by adding external parallel peripherals (LCD, keypad, EEPROM) on shared data bus. IC Role / Device Role / Timing Role: TTL-input compatible octal driver - accepts native 8051 output levels and drives 10+ LSTTL loads without fanout limitation. Use Value: Eliminates need for discrete transistor buffers or additional voltage translators, reducing BOM count and PCB area. |
Use Scenario: Interfacing 3.3 V FPGA I/O banks to 5 V legacy sensors or displays where VCC = 4.5 V supplies the buffer. IC Role / Device Role / Timing Role: Overvoltage-tolerant input buffer - accepts 3.3 V logic highs while driving 5 V bus with full swing and noise margin. Use Value: Achieves level translation without external resistors or dedicated level-shifter ICs, preserving signal edge rate and timing margins. |
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 |
|---|---|---|---|
| 74AHCT244PW,118 | TSSOP20 package (4.4 mm width); 10.0 mW/K thermal derating above 100 °C vs. SO20's 12.3 mW/K above 109 °C. | Better suited for space-constrained PCBs but requires tighter reflow profile due to finer pitch. | Select when board area is critical and thermal management includes forced airflow or copper pour. |
| SN74AHCT244N | PDIP-20 package; wider lead spacing (2.54 mm); higher junction-to-ambient thermal resistance (70 °C/W vs. SO20's 58 °C/W). | Preferred for prototyping, through-hole assembly, or legacy repair where socketing is required. | Choose for hand-soldered development boards or field-replaceable modules needing mechanical robustness. |
Compared with 74AHCT244PW,118 and SN74AHCT244N, the 74AHCT244D,112 offers optimal thermal performance in compact industrial enclosures, superior manufacturability in automated SMT lines, and proven reliability in high-temperature automotive subsystems - making it the default choice for volume production where thermal margin and process consistency are prioritized.
Availability
74AHCT244D,112 is available at Aetrix Electronics and suitable for industrial PLC backplane buffering, automotive ECU address bus isolation, and legacy 5 V microcontroller bus expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT244D,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 optimized for efficiency, reliability, and miniaturization in industrial, automotive, and consumer applications.
The 74AHCT244 series belongs to Nexperia's advanced logic portfolio designed specifically for robust signal integrity and mixed-voltage interoperability in harsh-environment embedded control systems.
FAQ
What is the maximum clock frequency supported by the 74AHCT244D,112?
The 74AHCT244D,112 does not operate on a clock; it is an asynchronous buffer. Its usable data rate depends on propagation delay (3.5 ns typ at 5 V, 15 pF) and system setup/hold timing. With 10 ns minimum pulse width and proper PCB layout, it reliably supports bus toggle rates exceeding 100 MHz in point-to-point configurations.
Can 74AHCT244D,112 be used with a 3.3 V supply?
No - the 74AHCT244 variant is specified only for 4.5 V to 5.5 V operation. Using 3.3 V violates recommended operating conditions and results in undefined input thresholds (VIH/VIL), degraded noise margin, and potential output weakness. For 3.3 V systems, use the 74AHC244D variant instead.
How should unused inputs be handled on the 74AHCT244D,112?
All unused inputs (A0–A3, 2A0–2A3, 1OE, 2OE) must be tied to VCC or GND - floating TTL inputs cause increased ICC, unpredictable logic states, and susceptibility to EMI. Unused outputs may remain unconnected when their respective OE is held HIGH (disabled), but best practice is to terminate with 10 kΩ pull-down if left open.
Is the 74AHCT244D,112 automotive-qualified?
Yes - the 74AHCT244D,112 is qualified per AEC-Q100 Grade 1 (-40 °C to +125 °C) and specified for automotive applications in the datasheet. It undergoes stress testing for temperature cycling, HTOL, and ESD per automotive standards, and is commonly deployed in engine control, body electronics, and ADAS subsystems.
74AHCT244D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74AHCT
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74AHCT244D,112 FAQ
1.How can I place an order for 74AHCT244D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT244D,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 74AHCT244D,112 reliable?
The price and inventory of 74AHCT244D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT244D,112 is usually 5 days.
3.What payment methods are accepted for 74AHCT244D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT244D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT244D,112?
74AHCT244D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT244D,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 74AHCT244D,112?
For technical support, including 74AHCT244D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT244D,112 requirements.
6.How does Aetrix verify that 74AHCT244D,112 is sourced from the original manufacturer or authorized distributors?
All 74AHCT244D,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 74AHCT244D,112 meets industry standards.
7.What is the process for return or replacement of 74AHCT244D,112?
All 74AHCT244D,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT244D,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 74AHCT244D,112 part is unused and in its original packaging.
Return procedure for 74AHCT244D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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