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Nexperia USA Inc. 74HCT244PW,112
- Part No.:
- 74HCT244PW,112
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT244PW,112.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,874
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Product details
Overview
74HCT244PW,112 from Nexperia is an octal non-inverting 3-state buffer/line driver with TTL-compatible inputs and two independent output-enable controls (1OE, 2OE), operating at 4.5 V to 5.5 V supply. It provides eight bidirectional data paths split into two groups of four, supports bus isolation in microcontroller I/O expansion, and delivers 6 mA output drive at 5 V with propagation delay as low as 11 ns (VCC = 4.5 V, CL = 15 pF).
For engineers reviewing the 74HCT244PW,112 datasheet, 74HCT244PW,112 pinout, 74HCT244PW,112 application, or 74HCT244PW,112 equivalent, key selection considerations include TTL-level input compatibility, dual 4-bit 3-state control, TSSOP20 thermal performance, and industrial temperature range (-40 °C to +125 °C) compliance.
Technical Context
This device 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). The logic function follows standard 3-state truth table behavior: outputs go high-impedance when OE is HIGH, and replicate inputs when OE is LOW.
Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static characteristics confirm VIH = 2.0 V (min) and VIL = 0.8 V (max) at VCC = 4.5–5.5 V, ensuring robust TTL-level recognition and noise immunity up to 0.4 V under worst-case conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with 5 V TTL systems and stable operation across industrial voltage tolerances. |
| Propagation Delay | 11 ns (typ) at VCC = 4.5 V, CL = 15 pF - Enables reliable timing in 20+ MHz digital bus applications without added skew. |
| Output Drive | ±6 mA at VCC = 4.5 V - Sufficient to drive standard 50 Ω transmission lines or multiple CMOS/TTL loads without external buffering. |
| Input Thresholds | VIH = 2.0 V (min), VIL = 0.8 V (max) - Guarantees unambiguous logic level recognition from legacy TTL sources. |
| Operating Temperature | -40 °C to +125 °C - Validated for use in industrial control cabinets, motor drives, and outdoor embedded systems. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Reduces risk of field failure during PCB handling and system integration. |
| Power Dissipation | 160 μA ICC (max) at -40 °C to +125 °C - Supports low-quiescent-power designs in always-on monitoring nodes. |
Pinout & Package
TSSOP20 plastic thin shrink small outline package (SOT360-1); 20-pin, 4.4 mm body width, 0.65 mm pitch; thermally enhanced for surface-mount reliability in dense PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enable inputs - Independently disable Group 1 (pins 18,16,14,12) or Group 2 (pins 3,5,7,9) outputs to isolate bus segments. |
| 2,4,6,8 | 1A0–1A3 | Group 1 data inputs - Connect to MCU port A or peripheral data lines requiring buffered fan-out. |
| 18,16,14,12 | 1Y0–1Y3 | Group 1 non-inverting 3-state outputs - Drive shared data bus or address lines with controlled contention avoidance. |
| 17,15,13,11 | 2A0–2A3 | Group 2 data inputs - Interface secondary controller or sensor interface signals needing level translation and buffering. |
| 3,5,7,9 | 2Y0–2Y3 | Group 2 non-inverting 3-state outputs - Provide isolated output path for memory-mapped peripherals or display drivers. |
| 10 | GND | Ground reference - Must be connected to system 0 V plane; decoupling capacitor (100 nF) required within 5 mm. |
| 20 | VCC | Positive supply - Requires local 100 nF ceramic bypass capacitor between pins 10 and 20 to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH ≥ 2.0 V, VIL ≤ 0.8 V at 5 V - Eliminates need for level-shifting circuitry when interfacing with legacy 5 V logic families. |
| Dual 4-bit 3-state control | Independent 1OE/2OE pins - Enables selective bus arbitration between two subsystems (e.g., CPU and DMA controller) on same physical trace. |
| Clamp diode protection | Integrated input clamping - Allows safe connection to 12 V or 24 V control signals via series resistor, reducing external protection components. |
| Industrial temperature range | -40 °C to +125 °C operation - Qualified for use in motor control enclosures, power supply monitoring, and factory automation hardware. |
| Low dynamic power | CPD = 35 pF per buffer - Limits switching power to < 1 mW per channel at 10 MHz, supporting energy-constrained edge nodes. |
Applications
| Microcontroller I/O Expansion | Memory Address Bus Buffering |
|---|---|
|
Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU with limited native I/O for driving LED arrays and relays. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating MCU port pins from higher-capacitance loads while enabling software-controlled bus release. Use Value: Prevents signal degradation on 15 cm PCB traces carrying 8-bit parallel data at 10 MHz, maintaining setup/hold margins > 3 ns. |
Use Scenario: Driving 16-bit address lines from a Z80 CPU to multiple SRAM chips sharing a common bus. IC Role / Device Role / Timing Role: Octal line driver providing fan-out gain and bus contention control via 1OE/2OE during memory read/write cycles. Use Value: Reduces address skew across 8-bit segments to < 1.5 ns, ensuring simultaneous access to dual-bank memory without timing violations. |
| Industrial PLC Input Conditioning | Legacy System Bus Isolation |
|
Use Scenario: Interfacing 24 V DC field sensors to a 5 V logic controller in a programmable logic controller backplane. IC Role / Device Role / Timing Role: Level-translating buffer using input clamp diodes with 4.7 kΩ series resistors to limit current into 5 V inputs. Use Value: Eliminates need for discrete Schottky clamps and pull-up networks, reducing BOM count by 12 components per channel. |
Use Scenario: Isolating a vintage ISA bus segment from modern FPGA-based peripheral cards to prevent signal integrity collapse. IC Role / Device Role / Timing Role: Bidirectional 3-state repeater enabling hot-swap capability and fault containment between legacy and new subsystems. Use Value: Maintains signal rise/fall times < 12 ns over 10 cm stubs, meeting ISA specification tR/tF ≤ 15 ns at 8 MHz clock rate. |
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 |
|---|---|---|---|
| SN74HCT244N | DIP-20 package; no thermal pad; higher RθJA (70 °C/W vs. 100 °C/W for TSSOP20) | Suitable only for prototyping or low-density through-hole boards; not recommended for automated SMT production. | Select only if manual assembly or socket-based test fixtures are required; avoid for volume production. |
| 74LVC244APW | Lower VCC range (1.65–3.6 V); CMOS inputs; 24 mA drive; 3.3 V logic domain only | Requires level shifters for 5 V systems; incompatible with direct TTL input sourcing. | Choose only for 3.3 V-only designs where higher speed (tPD = 3.2 ns) and lower power justify redesign effort. |
Compared with SN74HCT244N and 74LVC244APW, the 74HCT244PW,112 uniquely balances 5 V TTL compatibility, TSSOP20 manufacturability, and industrial temperature resilience-making it optimal for retrofitting legacy 5 V systems with modern SMT constraints.
Availability
74HCT244PW,112 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller I/O expansion modules, memory address bus interfaces, and legacy system bus isolation requiring stable component supply across extended temperature ranges.
Supply support for 74HCT244PW,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 focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT244PW,112 belongs to Nexperia's industry-standard HC/HCT logic family, engineered specifically for robust 5 V digital interfacing in harsh environments where reliability, noise immunity, and long-term supply stability are critical.
FAQ
What is the maximum output current per pin for 74HCT244PW,112?
The absolute maximum output current per pin is ±35 mA, but the recommended operating condition specifies ±6 mA for VOH/VOL compliance at VCC = 4.5 V. Exceeding ±6 mA risks violating VOH ≥ 3.98 V or VOL ≤ 0.26 V, potentially causing logic errors in downstream CMOS loads.
Can 74HCT244PW,112 operate at 3.3 V supply?
No. The 74HCT244PW,112 is specified only for VCC = 4.5 V to 5.5 V. At 3.3 V, VIH minimum (2.0 V) exceeds 60% of VCC, risking unreliable HIGH recognition; static characteristics and propagation delay are not characterized below 4.5 V.
How does the input clamp diode function in practical design?
The integrated clamp diodes connect each input to VCC and GND. When interfacing to 12 V signals, a 4.7 kΩ series resistor limits forward current to ~1.5 mA (per diode), preventing damage while allowing clean logic-level translation without external components.
Is thermal pad connection required for TSSOP20 package?
No. The exposed thermal pad (pin 1 index area) has no electrical function. Per Nexperia SOT360-1 documentation, it may remain floating or be connected to GND-but soldering is optional and provides no electrical benefit unless used for mechanical reinforcement.
74HCT244PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74HCT244PW,112 FAQ
1.How can I place an order for 74HCT244PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT244PW,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 74HCT244PW,112 reliable?
The price and inventory of 74HCT244PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT244PW,112 is usually 5 days.
3.What payment methods are accepted for 74HCT244PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT244PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT244PW,112?
74HCT244PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT244PW,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 74HCT244PW,112?
For technical support, including 74HCT244PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT244PW,112 requirements.
6.How does Aetrix verify that 74HCT244PW,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT244PW,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 74HCT244PW,112 meets industry standards.
7.What is the process for return or replacement of 74HCT244PW,112?
All 74HCT244PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT244PW,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 74HCT244PW,112 part is unused and in its original packaging.
Return procedure for 74HCT244PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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