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Nexperia USA Inc. 74HCT244PW,118
- Part No.:
- 74HCT244PW,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT244PW,118.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,197
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Product details
Overview
74HCT244PW,118 from Nexperia is an octal non-inverting 3-state buffer/line driver with TTL-compatible inputs and dual independent output-enable controls (1OE, 2OE), operating at 4.5 V to 5.5 V supply. It delivers 6 mA sink/source drive strength, 11 ns typical propagation delay at 5 V, and supports industrial temperature range (–40 °C to +125 °C) in a TSSOP20 package. It is used for bidirectional bus interfacing in microcontroller peripheral expansion and memory address/data buffering.
For engineers reviewing the 74HCT244PW,118 datasheet, 74HCT244PW,118 pinout, 74HCT244PW,118 application, or 74HCT244PW,118 equivalent, key selection criteria include TTL-level input compatibility, dual 4-bit enable control, 3-state bus contention avoidance, and thermal performance in space-constrained TSSOP layouts.
Technical Context
This device implements two independent 4-bit non-inverting buffers, each controlled by its own active-low 3-state enable (1OE for Y0–Y3, 2OE for Y4–Y7). Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
It operates strictly within 4.5 V to 5.5 V for the HCT variant, with VIH = 2.0 V (min), VIL = 0.8 V (max), VOH ≥ 3.7 V (at 6 mA), and VOL ≤ 0.4 V (at 6 mA), ensuring robust noise margins and compatibility with legacy 5 V TTL logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation with standard 5 V rail and tolerance for ±10 % variation. |
| Input Logic Level | TTL-compatible - Accepts 2.0 V min HIGH and 0.8 V max LOW, enabling direct connection to 5 V microcontrollers and legacy peripherals. |
| Output Drive | ±6 mA - Sufficient to drive 10 LSTTL loads or terminate short PCB traces without external buffers. |
| Propagation Delay | 11 ns typ @ 5 V, CL = 15 pF - Enables reliable operation in 30 MHz+ address/data strobe timing windows. |
| Enable/Disable Time | 15 ns typ enable, 15 ns typ disable @ 5 V - Supports fast bus arbitration and dynamic bus sharing in multiprocessor systems. |
| Operating Temperature | –40 °C to +125 °C - Qualified for under-hood automotive ECUs, industrial PLC I/O modules, and high-ambient embedded controllers. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Reduces risk of handling damage during manual assembly and board rework. |
Pinout & Package
TSSOP20 package (SOT360-1): 20-pin thin shrink small outline, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low enables - Independently place first or second 4-bit output group into high-impedance state to prevent bus conflicts. |
| 2, 4, 6, 8 | 1A0–1A3 | Input group A - Connects to source bus segment (e.g., MCU port pins) for first 4-bit channel. |
| 18, 16, 14, 12 | 1Y0–1Y3 | Output group A - Drives destination bus (e.g., peripheral address lines) with non-inverted signal and 3-state control. |
| 17, 15, 13, 11 | 2A0–2A3 | Input group B - Accepts second 4-bit data stream (e.g., sensor interface bus). |
| 3, 5, 7, 9 | 2Y0–2Y3 | Output group B - Provides isolated 4-bit buffered output with independent enable, supporting dual-bus architectures. |
| 10 | GND | Signal reference - Must be low-inductance connection to system ground plane to maintain noise immunity and switching integrity. |
| 20 | VCC | Power supply - Requires local 100 nF ceramic decoupling placed within 3 mm of pin to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state enables | Allows concurrent control of two 4-bit channels - eliminates need for external gating logic in split-bus applications. |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees interoperability with 5 V microcontrollers, FPGAs, and legacy logic without level shifters. |
| Clamp diode protected inputs | Enables safe interface to overvoltage sources (e.g., 12 V sensors) using series current-limiting resistors - avoids external TVS components. |
| Low dynamic power dissipation | CPD = 35 pF per buffer - Limits switching current draw in high-frequency bus applications, reducing thermal load in dense layouts. |
| Industrial temperature qualification | –40 °C to +125 °C operation - Validated for use in motor drives, power supplies, and outdoor industrial gateways without derating. |
Applications
| Microcontroller Peripheral Expansion | Memory Address/Data Buffering |
|---|---|
|
Use Scenario: Expanding GPIO count of an ARM Cortex-M4 MCU to drive 8-bit parallel LCD, keypad matrix, or LED array. IC Role / Device Role: Non-inverting 3-state buffer isolating MCU port from external loads while enabling shared bus access. Use Value: Prevents loading-induced timing skew on MCU outputs and allows safe hot-plug of peripheral modules via OE-controlled isolation. |
Use Scenario: Isolating 8-bit address/data lines between an FPGA and external SRAM or flash memory in a compact embedded controller. IC Role / Device Role: Bidirectional line driver buffering address latch signals and data bus transitions with precise timing control. Use Value: Eliminates signal integrity degradation from capacitive loading and ensures setup/hold margin compliance at 20 MHz bus speeds. |
| Industrial I/O Module Interface | Legacy System Bus Translation |
|
Use Scenario: Interfacing 5 V TTL-level digital inputs from PLC field sensors to a 3.3 V industrial microcontroller. IC Role / Device Role: Level-tolerant buffer with input clamping, providing voltage translation and noise filtering without external components. Use Value: Enables direct connection to 12 V sensor outputs using 10 kΩ series resistors, reducing BOM count and PCB area. |
Use Scenario: Replacing obsolete 74LS244 in a legacy test equipment backplane where 5 V TTL logic remains in service. IC Role / Device Role: Pin- and function-compatible upgrade offering lower power, higher noise immunity, and extended temperature range. Use Value: Extends product lifecycle without redesign - maintains identical timing behavior while improving reliability in high-temperature enclosures. |
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 package inductance; 13 ns max tpd vs. 11 ns typ for PW. | Suitable for prototyping and through-hole boards; unsuitable for high-density or thermally constrained designs. | Select when hand-soldering or breadboarding is required; avoid for production PCBs with >2 layer stacks or >50 kHz switching. |
| 74LVC244APW | 3.3 V only (1.65–3.6 V); CMOS inputs; 24 mA drive; 3.8 ns typ tpd; lower VIL/VIH thresholds. | Requires level shifting for 5 V systems; superior speed/power for modern low-voltage MCUs and FPGAs. | Choose for new 3.3 V designs prioritizing speed and density; not drop-in compatible with 5 V TTL interfaces. |
Compared with SN74HCT244N, the 74HCT244PW,118 offers superior thermal performance and layout density; compared with 74LVC244APW, it provides native 5 V TTL compatibility but trades off speed and drive strength for robustness in mixed-voltage legacy environments.
Availability
74HCT244PW,118 is available at Aetrix Electronics and suitable for microcontroller peripheral expansion, memory address/data buffering, industrial I/O module interface, and legacy system bus translation requiring stable component supply across automotive, industrial, and computing applications.
Supply support for 74HCT244PW,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 logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, automotive, and consumer electronics.
The 74HCT244PW,118 belongs to Nexperia's industry-standard HC/HCT logic family, designed specifically for robust 5 V TTL-compatible interfacing in space- and thermal-constrained embedded systems.
FAQ
What is the maximum clock frequency supported by the 74HCT244PW,118?
The 74HCT244PW,118 is not a clocked device and has no internal clock; its usable data rate depends on propagation delay and bus loading. With 11 ns typical tpd and 15 pF load, it reliably supports asynchronous bus transfers up to ~30 MHz in point-to-point configurations, assuming proper termination and layout.
Can 74HCT244PW,118 drive LEDs directly?
No - its 6 mA output drive is insufficient for most indicator LEDs requiring 10–20 mA. It can drive high-efficiency LEDs at reduced brightness with series resistors ≥1 kΩ, but dedicated LED drivers or transistor buffers are recommended for full-brightness operation.
Is the exposed pad on the TSSOP20 package electrically connected?
No - the exposed pad in SOT360-1 is a thermal slug with no electrical connection. Nexperia specifies it may remain floating or be soldered to a non-powered copper pour for thermal relief, but must never be tied to VCC or GND unless explicitly designed as such in the PCB stackup.
How does the 74HCT244PW,118 differ from the 74HC244PW version?
The 74HCT244PW uses TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), while the 74HC244PW uses CMOS thresholds (VIH ≈ 3.15 V at 4.5 V). This makes the HCT variant interoperable with 5 V TTL outputs without level shifters, whereas the HC version requires compatible CMOS drivers.
74HCT244PW,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 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,118 FAQ
1.How can I place an order for 74HCT244PW,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT244PW,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 74HCT244PW,118 reliable?
The price and inventory of 74HCT244PW,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT244PW,118 is usually 5 days.
3.What payment methods are accepted for 74HCT244PW,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT244PW,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT244PW,118?
74HCT244PW,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT244PW,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 74HCT244PW,118?
For technical support, including 74HCT244PW,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT244PW,118 requirements.
6.How does Aetrix verify that 74HCT244PW,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT244PW,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 74HCT244PW,118 meets industry standards.
7.What is the process for return or replacement of 74HCT244PW,118?
All 74HCT244PW,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT244PW,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 74HCT244PW,118 part is unused and in its original packaging.
Return procedure for 74HCT244PW,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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