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NXP Semiconductors 74HCT244N,652
- Part No.:
- 74HCT244N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT244N,652.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,767
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Product details
Overview
74HCT244N,652 from Nexperia is an octal non-inverting 3-state buffer/line driver with TTL-compatible inputs, dual independent output-enable controls (1OE, 2OE), 8-bit bus interface capability, and operation over 4.5 V to 5.5 V supply at -40 °C to +125 °C. It serves as a bidirectional bus isolator or level-shifting driver in microcontroller peripheral expansion and memory address/data buffering.
For engineers reviewing the 74HCT244N,652 datasheet, 74HCT244N,652 pinout, 74HCT244N,652 application, or 74HCT244N,652 equivalent, key selection criteria include TTL-level input compatibility, 3-state output timing (tpd ≤ 33 ns @ VCC = 4.5 V), SO20 package mechanical fit, and industrial temperature range support.
Technical Context
The 74HCT244N,652 implements two independent 4-bit non-inverting buffer sections, each controlled by its own active-low output enable (1OE for Y0–Y3, 2OE for Y0–Y3 of second group). Inputs accept standard TTL voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5 V–5.5 V), enabling direct interfacing with legacy 5 V logic families without level shifters.
Its CMOS output stage delivers rail-to-rail drive capability (VOH ≥ 3.7 V, VOL ≤ 0.4 V @ IO = ±6 mA) while maintaining low static current (ICC ≤ 160 μA max) and high noise immunity. The device complies with JEDEC JESD7A and supports ESD protection per HBM (>2000 V) and CDM (>1000 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Octal non-inverting 3-state buffer with dual OE control |
| Supply Voltage | 4.5 V to 5.5 V - matches standard 5 V TTL systems without regulation overhead |
| Input Compatibility | TTL-level - accepts 0.8 V/2.0 V thresholds, eliminating external level translation |
| Propagation Delay | ≤33 ns @ VCC = 4.5 V, CL = 15 pF - supports 20+ MHz bus clocking |
| Output Drive | ±6 mA - sufficient to drive 10 LSTTL loads or 15 pF transmission lines |
| Operating Temperature | -40 °C to +125 °C - qualified for industrial and extended-temperature embedded control |
| ESD Rating | HBM >2000 V, CDM >1000 V - meets IEC 61000-4-2 system-level robustness requirements |
Pinout & Package
74HCT244N,652 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Pin 1 is index-marked; pin 10 is GND; pin 20 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enables - independently disable Group 1 (Y0–Y3) or Group 2 (Y0–Y3) |
| 2, 4, 6, 8 | 1A0–1A3 | Data inputs for first 4-bit buffer group - TTL-compatible, clamp diodes allow overvoltage tolerance |
| 3, 5, 7, 9 | 2Y0–2Y3 | Outputs for second 4-bit buffer group - non-inverting, 3-state, high-drive CMOS |
| 10 | GND | Ground reference - must be connected to system 0 V plane for noise immunity |
| 11, 13, 15, 17 | 2A0–2A3 | Data inputs for second 4-bit buffer group - electrically identical to 1A0–1A3 |
| 12, 14, 16, 18 | 1Y0–1Y3 | Outputs for first 4-bit buffer group - matched timing and drive to 2Y0–2Y3 |
| 20 | VCC | Positive supply - decoupling capacitor (100 nF) required within 10 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Enables selective isolation of two 4-bit data paths on shared bus without contention |
| TTL-compatible input thresholds | Eliminates need for external level translators when interfacing with 5 V microcontrollers or FPGAs |
| Clamp diode protected inputs | Allows safe connection to signals exceeding VCC (e.g., 12 V sensor outputs with current-limiting resistors) |
| High noise immunity | CMOS design provides >40 % VCC noise margin, reducing susceptibility to EMI in industrial environments |
| JEDEC-compliant packaging | SO20 footprint ensures drop-in replacement compatibility with legacy 74-series designs |
Applications
| Industrial PLC I/O Expansion | Microcontroller Peripheral Bus Isolation |
|---|---|
Use Scenario: Isolating 8-bit parallel I/O ports between CPU and field I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling time-multiplexed read/write access to shared address/data bus. Use Value: Prevents bus contention during hot-swap of I/O cards; 33 ns propagation delay supports 20 MHz scan cycle timing. |
Use Scenario: Interfacing an 8-bit microcontroller's address/data bus to external SRAM or flash memory. IC Role / Device Role / Timing Role: Non-inverting line driver providing fanout and noise margin for memory control signals (ALE, RD, WR). Use Value: TTL-compatible inputs simplify connection to MCU GPIO; ±6 mA drive ensures signal integrity across 10 cm PCB traces. |
| Legacy System Bus Buffering | Test Equipment Signal Conditioning |
Use Scenario: Upgrading aging 74LS244-based backplane systems with lower-power, higher-speed CMOS equivalents. IC Role / Device Role / Timing Role: Drop-in replacement buffer maintaining pinout and logic function while reducing power and improving timing margins. Use Value: SO20 package matches original footprint; 160 μA max ICC cuts board-level power by >90 % vs. LS logic. |
Use Scenario: Driving multiple DUT inputs simultaneously from a single pattern generator channel in automated test equipment. IC Role / Device Role / Timing Role: Fanout buffer distributing synchronized digital stimulus while maintaining edge integrity. Use Value: 5 ns transition time preserves signal rise/fall fidelity; 3-state outputs allow dynamic reconfiguration of test vectors. |
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 | TI-manufactured; identical pinout, TTL input thresholds, and SO20 package; tpd = 33 ns @ 4.5 V same | Same industrial temperature range (-40 °C to +125 °C); identical JEDEC compliance | Select for multi-source procurement or TI-design ecosystem alignment |
| 74HCT244PW,118 | Nexperia TSSOP20 variant; same electrical specs but 4.4 mm body width; 0.65 mm pitch | Requires PCB layout change; better thermal performance (10.0 mW/K derating above 100 °C) | Choose for space-constrained boards where SO20 footprint is unavailable |
Compared with SN74HCT244N and 74HCT244PW,118, the 74HCT244N,652 offers identical functional behavior and timing in the industry-standard SO20 package, making it optimal for legacy-compatible designs requiring no layout revision or sourcing diversification.
Availability
74HCT244N,652 is available at Aetrix Electronics and suitable for industrial automation, embedded controller bus expansion, and legacy system upgrades requiring stable component supply across long production lifecycles.
Supply support for 74HCT244N,652 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, reliable discrete, logic, and MOSFET solutions optimized for efficiency and miniaturization in industrial, automotive, and consumer applications.
The 74HCT244N,652 belongs to Nexperia's 74HCT logic family, engineered for TTL-compatible interfacing in 5 V systems with emphasis on low power, high noise immunity, and industrial temperature resilience.
FAQ
What is the maximum operating supply voltage for the 74HCT244N,652?
The 74HCT244N,652 has a recommended maximum supply voltage of 5.5 V, with absolute maximum rating at +7 V. Operation beyond 5.5 V risks violating recommended conditions and may degrade long-term reliability. All DC and AC specifications in the datasheet are validated within 4.5 V to 5.5 V.
Does the 74HCT244N,652 support 3.3 V logic inputs?
No - the 74HCT244N,652 is designed for TTL-level inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V). A 3.3 V logic HIGH may not reliably exceed the 2.0 V VIH threshold under worst-case conditions. For 3.3 V systems, use 74HC244 variants or level translators.
Can both output-enable pins (1OE and 2OE) be tied together in the 74HCT244N,652?
Yes - tying 1OE and 2OE together simplifies control to a single 3-state enable signal, converting the 74HCT244N,652 into an 8-bit unified buffer. This configuration maintains full functionality and timing specs, provided the combined enable net is properly routed and loaded.
What is the thermal resistance (RθJA) of the 74HCT244N,652 in SO20 package?
The 74HCT244N,652 in SO20 (SOT163-1) package has a typical junction-to-ambient thermal resistance of 109 °C/W. Total power dissipation derates linearly at 12.3 mW/K above 109 °C ambient, limiting usable power at elevated temperatures.
Is the 74HCT244N,652 automotive qualified?
No - the 74HCT244N,652 is specified for industrial temperature range (-40 °C to +125 °C) and is not AEC-Q100 qualified. It lacks automotive-specific testing, qualification reports, or guaranteed PPAP documentation. Use only in non-safety-critical industrial or commercial applications.
74HCT244N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HCT244N,652 FAQ
1.How can I place an order for 74HCT244N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT244N,652 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 74HCT244N,652 reliable?
The price and inventory of 74HCT244N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT244N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT244N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT244N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT244N,652?
74HCT244N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT244N,652 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 74HCT244N,652?
For technical support, including 74HCT244N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT244N,652 requirements.
6.How does Aetrix verify that 74HCT244N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT244N,652 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 74HCT244N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT244N,652?
All 74HCT244N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT244N,652, 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 74HCT244N,652 part is unused and in its original packaging.
Return procedure for 74HCT244N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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