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NXP Semiconductors 74HC244PW/AUJ
- Part No.:
- 74HC244PW/AUJ
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HC244PW/AUJ.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,723
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Product details
Overview
74HC244PW/AUJ from Nexperia is an octal non-inverting 3-state buffer/line driver in TSSOP20 package, operating from 2.0 V to 6.0 V supply, featuring dual independent output enables (1OE, 2OE), CMOS-level input compatibility, and ±35 mA output drive capability. It serves as a bidirectional bus interface or level-shifting driver in microcontroller peripheral expansion, memory address latching, and industrial I/O isolation circuits.
For engineers reviewing the 74HC244PW/AUJ datasheet, 74HC244PW/AUJ pinout, 74HC244PW/AUJ application, or 74HC244PW/AUJ equivalent, key selection criteria include its 2.0–6.0 V wide supply range, -40 °C to +125 °C temperature rating, 3-state timing (tpd ≤ 22 ns at VCC = 4.5 V), and TSSOP20 footprint compatibility with space-constrained PCB layouts.
Technical Context
The 74HC244PW/AUJ implements two independent 4-bit buffer sections, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y0'–Y3'). Its CMOS input structure provides high noise immunity and supports interfacing with current-limiting resistors for overvoltage-tolerant inputs.
Each output delivers rail-to-rail switching with defined VOH/VOL across temperature and voltage, and exhibits low dynamic power dissipation (CPD = 35 pF per buffer) due to optimized CMOS gate design. The device complies with JEDEC JESD7A and JESD8C standards and meets HBM ESD > 2000 V and CDM > 1000 V requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 6.0 V - Enables direct interface with 3.3 V and 5 V logic systems without level shifters. |
| Propagation Delay | ≤ 22 ns at VCC = 4.5 V, CL = 15 pF - Supports reliable operation in 20+ MHz digital buses. |
| Output Drive | ±35 mA - Sufficient to drive four standard TTL loads or terminate stubs on medium-length PCB traces. |
| Operating Temperature | -40 °C to +125 °C - Qualified for industrial and extended-temperature embedded control applications. |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - Ensures robust noise margin (>1.3 V) in noisy environments. |
| Power Dissipation Cap | 500 mW (derated above 100 °C) - Allows sustained operation under moderate thermal load in compact enclosures. |
| ESD Rating | HBM > 2000 V, CDM > 1000 V - Reduces risk of handling damage during manual assembly or field service. |
Pinout & Package
TSSOP20 package (SOT360-1): plastic thin shrink small outline, 20 leads, body width 4.4 mm, 0.65 mm pitch, exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - Independently disable Group 1 (pins 12,14,16,18) or Group 2 (pins 3,5,7,9) outputs to high-impedance state. |
| 2,4,6,8 | 1A0–1A3 | Group 1 data inputs - Connect to upstream source (e.g., MCU port) driving corresponding Y outputs. |
| 18,16,14,12 | 1Y0–1Y3 | Group 1 non-inverting buffered outputs - Deliver logic-pass-through signals with 3-state control via 1OE. |
| 17,15,13,11 | 2A0–2A3 | Group 2 data inputs - Electrically isolated from Group 1; support dual-bus or mirrored signal routing. |
| 3,5,7,9 | 2Y0–2Y3 | Group 2 non-inverting buffered outputs - Enable independent bus arbitration or direction-controlled data paths. |
| 10 | GND | Ground reference - Must be low-impedance connection to minimize ground bounce in high-speed switching. |
| 20 | VCC | Positive supply - Requires local 100 nF ceramic decoupling within 5 mm of pin for stable transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2.0 V to 6.0 V - Eliminates need for separate voltage regulators when interfacing mixed-voltage subsystems. |
| Dual independent 3-state control | Separate 1OE/2OE pins - Enables time-multiplexed bus sharing between two peripherals without external logic. |
| Input clamp diodes | Integrated protection - Permits safe use of series current-limiting resistors for interfacing to voltages up to VCC + 0.5 V. |
| Latch-up immunity | > 100 mA per JESD78 Class II Level B - Prevents destructive latch-up during transient overvoltage events. |
| Low dynamic power | CPD = 35 pF per buffer - Limits switching power to < 1.5 mW per channel at 10 MHz, reducing thermal load. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Peripheral Bus Isolation |
|---|---|
|
Use Scenario: Isolating 8-bit parallel data paths between a main controller and modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing bidirectional signal conditioning and bus contention prevention during hot-swap operations. Use Value: Dual OE control allows staggered enable/disable sequencing to prevent bus glitches during card insertion/removal. |
Use Scenario: Extending GPIO count of an ARM Cortex-M microcontroller to drive multiple LCD segments, LED arrays, or sensor interfaces. IC Role / Device Role / Timing Role: Octal line driver buffering MCU port pins while maintaining signal integrity across 50 mm PCB traces. Use Value: ±35 mA drive strength ensures full logic swing into 50 pF loads, eliminating need for discrete transistor buffers. |
| Memory Address Latching Interface | Legacy Parallel Printer Port Driver |
|
Use Scenario: Driving 8-bit address lines from a microprocessor to external SRAM or EPROM chips in embedded instrumentation. IC Role / Device Role / Timing Role: Low-propagation-delay buffer (tpd ≤ 22 ns) ensuring setup/hold timing margins for 25 MHz memory access cycles. Use Value: Rail-to-rail VOH/VOL guarantees compatible logic levels with both CMOS and TTL memory devices. |
Use Scenario: Replacing obsolete 74LS244 in legacy parallel printer interface circuits requiring 3-state handshake signaling. IC Role / Device Role / Timing Role: Pin-compatible upgrade delivering lower power consumption and wider voltage tolerance than LS-family equivalents. Use Value: CMOS input thresholds and 2.0–6.0 V operation allow direct replacement without modifying existing 5 V supply rails or pull-up networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT244PW | TTL-compatible inputs (VIH = 2.0 V, VIL = 0.8 V at VCC = 5 V); identical pinout and timing. | Required when interfacing with legacy 5 V TTL logic families where HC-level thresholds cause marginal noise margin. | Select 74HCT244PW only if driven by standard TTL outputs; otherwise 74HC244PW offers superior noise immunity. |
| SN74LVC244APWR | 3.3 V only (1.65–3.6 V), higher speed (tpd ≤ 5.4 ns), lower ICC (10 μA max), same TSSOP20 footprint. | Suitable for modern low-voltage FPGA/CPU I/O expansion but incompatible with 5 V systems. | Choose SN74LVC244APWR for new 3.3 V designs prioritizing speed and quiescent power; retain 74HC244PW for 5 V or mixed-voltage legacy integration. |
Compared with 74HCT244PW and SN74LVC244APWR, the 74HC244PW/AUJ uniquely balances wide-voltage operation (2.0–6.0 V), industrial temperature range (-40 °C to +125 °C), and proven reliability in long-lifecycle industrial equipment-making it the preferred choice for retrofit and multi-generation platform designs.
Availability
74HC244PW/AUJ is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller peripheral bus isolation, and memory address latching requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for 74HC244PW/AUJ 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 specializing in high-performance, energy-efficient logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HC244PW/AUJ belongs to Nexperia's industry-standard HC logic family, designed for robust, low-power digital interfacing in harsh environments where voltage flexibility and long-term reliability are critical.
FAQ
What is the maximum supply voltage rating for the 74HC244PW/AUJ?
The 74HC244PW/AUJ has an absolute maximum supply voltage (VCC) of +7.0 V, but its recommended operating range is 2.0 V to 6.0 V. Operating continuously above 6.0 V risks exceeding internal oxide breakdown limits and invalidates parametric guarantees. For sustained 5 V system use, the 74HC244PW/AUJ delivers full specification compliance including VOH ≥ 4.4 V and VOL ≤ 0.26 V at -40 °C to +125 °C.
Does the 74HC244PW/AUJ support true bidirectional data flow?
No, the 74HC244PW/AUJ is a unidirectional non-inverting buffer: signals flow only from A-inputs to Y-outputs. It does not contain internal direction-control logic or bus transceivers. However, two 74HC244PW/AUJ devices can be paired-one for transmit, one for receive-with external OE coordination to emulate bidirectional behavior in custom bus architectures.
Can the 74HC244PW/AUJ be used with 3.3 V microcontrollers?
Yes, the 74HC244PW/AUJ operates reliably at 3.3 V supply and accepts 3.3 V logic inputs as valid HIGH (VIH = 2.1 V min at VCC = 3.3 V). Its outputs swing rail-to-rail, delivering VOH ≥ 3.1 V and VOL ≤ 0.26 V, making it fully compatible with 3.3 V CMOS interfaces without level-shifting components.
What is the thermal derating behavior of the 74HC244PW/AUJ in TSSOP20 package?
The 74HC244PW/AUJ in TSSOP20 (SOT360-1) has a total power dissipation limit of 500 mW at TA ≤ 100 °C, derating linearly at 10.0 mW/K above that temperature. At 125 °C ambient, maximum allowable power drops to 250 mW. This requires careful layout with thermal vias under the exposed pad (if soldered) and minimal adjacent heat sources to maintain junction temperature below 150 °C.
How does the 74HC244PW/AUJ differ from the 74HC244D (SO20) variant?
The 74HC244PW/AUJ uses the TSSOP20 (SOT360-1) package - 4.4 mm body width, 0.65 mm lead pitch - while the 74HC244D uses SO20 (SOT163-1) - 7.5 mm body width, 1.27 mm pitch. Both share identical electrical specifications, pin functions, and thermal limits, but the PW version enables higher PCB density and improved high-frequency performance due to lower parasitic inductance.
74HC244PW/AUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74HC244PW/AUJ FAQ
1.How can I place an order for 74HC244PW/AUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC244PW/AUJ 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 74HC244PW/AUJ reliable?
The price and inventory of 74HC244PW/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC244PW/AUJ is usually 5 days.
3.What payment methods are accepted for 74HC244PW/AUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC244PW/AUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC244PW/AUJ?
74HC244PW/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC244PW/AUJ 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 74HC244PW/AUJ?
For technical support, including 74HC244PW/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC244PW/AUJ requirements.
6.How does Aetrix verify that 74HC244PW/AUJ is sourced from the original manufacturer or authorized distributors?
All 74HC244PW/AUJ 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 74HC244PW/AUJ meets industry standards.
7.What is the process for return or replacement of 74HC244PW/AUJ?
All 74HC244PW/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74HC244PW/AUJ, 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 74HC244PW/AUJ part is unused and in its original packaging.
Return procedure for 74HC244PW/AUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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