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NXP Semiconductors 74HC244N,652
- Part No.:
- 74HC244N,652
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC244N,652.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,209
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Product details
Overview
74HC244N,652 from Nexperia is an octal non-inverting 3-state buffer/line driver with two independent output-enable controls (1OE, 2OE), operating across 2.0 V to 6.0 V supply. It delivers 8-bit bus interfacing capability with propagation delay as low as 9 ns at VCC = 6.0 V and CL = 15 pF, and supports industrial temperature range (–40 °C to +125 °C). It is used in microcontroller I/O expansion, memory address/data bus isolation, and digital logic level translation.
For engineers reviewing the 74HC244N,652 datasheet, 74HC244N,652 pinout, 74HC244N,652 application, or 74HC244N,652 equivalent, key selection criteria include CMOS-level input compatibility, dual 4-bit enable control, high-noise-immunity operation, and SO20 package suitability for through-hole prototyping and legacy PCB layouts.
Technical Context
The 74HC244N,652 implements standard HC-series CMOS logic with rail-to-rail input voltage tolerance (0 V to VCC) and outputs capable of sourcing/sinking ±35 mA. Its dual 3-state enable architecture allows independent control of two 4-bit output groups (1Y0–1Y3 and 2Y0–2Y3), enabling flexible bus arbitration without external gating logic.
Input clamp diodes permit safe interface to voltages exceeding VCC when used with current-limiting resistors. Static characteristics confirm VIH ≥ 3.15 V and VOL ≤ 0.26 V at VCC = 4.5 V and IO = 6.0 mA, ensuring robust TTL-compatible output drive under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 6.0 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral bus) |
| Propagation Delay | 9 ns (typ.) at VCC = 6.0 V, CL = 15 pF - enables reliable operation in 50 MHz+ digital control paths |
| Output Drive | ±35 mA - sufficient to directly drive LEDs, small relays, or multiple 74-series inputs without buffers |
| Operating Temperature | –40 °C to +125 °C - qualified for industrial and extended-temperature embedded applications |
| Input Leakage | ±1.0 μA max (–40 °C to +125 °C) - ensures minimal loading on high-impedance signal sources |
| Power Dissipation | 500 mW max (SO20 package) - supports continuous operation with standard PCB copper area |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - meets JEDEC JS-001/JS-002 Class 2/C3 for handling robustness |
Pinout & Package
74HC244N,652 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, through-hole mountable. Pin 1 is marked by a notch or dot; pin 10 is GND, pin 20 is VCC.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-LOW enable inputs - each controls four outputs (1Yn or 2Yn); HIGH forces high-impedance state |
| 2, 4, 6, 8 | 1A0–1A3 | Group 1 data inputs - routed to outputs 1Y0–1Y3 when 1OE = LOW |
| 3, 5, 7, 9 | 2Y0–2Y3 | Group 2 outputs - driven by 2A0–2A3 when 2OE = LOW |
| 10 | GND | Ground reference - must be connected to system 0 V plane for noise immunity and correct logic thresholds |
| 11, 13, 15, 17 | 2A0–2A3 | Group 2 data inputs - routed to outputs 2Y0–2Y3 when 2OE = LOW |
| 12, 14, 16, 18 | 1Y0–1Y3 | Group 1 outputs - driven by 1A0–1A3 when 1OE = LOW |
| 20 | VCC | Positive supply - decoupling capacitor (100 nF ceramic) required within 5 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0 V to 6.0 V operation enables direct use with 3.3 V and 5 V systems without level shifters |
| Dual Independent Enables | Separate 1OE and 2OE pins allow time-multiplexed or domain-isolated bus access without external logic |
| CMOS-Level Inputs | VIH/VIL thresholds scale with VCC - eliminates need for external pull-ups or threshold-setting resistors |
| Clamp Diode Protection | Integrated input diodes support safe interface to signals up to VCC + 0.5 V using series current-limiting resistors |
| High Noise Immunity | Typical noise margin > 45% of VCC - maintains reliable operation in electrically noisy industrial environments |
Applications
| Microcontroller I/O Expansion | Memory Bus Isolation |
|---|---|
|
Use Scenario: Expanding GPIO count of an ARM Cortex-M0+ MCU to drive 16-segment displays and keypad scanning. IC Role / Device Role: Bidirectional buffer isolating MCU port pins from display segment current loads and keypad bounce transients. Use Value: Prevents MCU port latch-up during hot-plug events and reduces firmware overhead by eliminating software-controlled tristate sequencing. |
Use Scenario: Isolating address/data lines between an FPGA configuration controller and parallel NOR flash memory. IC Role / Device Role: Unidirectional 3-state buffer enabling clean bus release during FPGA reconfiguration cycles. Use Value: Eliminates bus contention during flash read/write transitions, ensuring deterministic timing and preventing memory corruption. |
| Industrial Sensor Interface Hub | Legacy System Signal Translation |
|
Use Scenario: Aggregating digital outputs from eight 4–20 mA loop-powered sensors into a single RS-485 master interface. IC Role / Device Role: Level-shifting and current-driving buffer converting sensor open-collector outputs to clean 5 V logic levels. Use Value: Provides consistent 5 V logic swing and ±35 mA drive to overcome cable capacitance over 30 m twisted-pair runs. |
Use Scenario: Interfacing a modern 3.3 V SoC to legacy 5 V ISA-bus peripherals in retro-computing restoration. IC Role / Device Role: Voltage-tolerant buffer translating 3.3 V outputs to full 5 V swing while accepting 5 V inputs safely via clamp diodes. Use Value: Avoids external level shifters and protects SoC I/O from overvoltage, enabling drop-in compatibility with vintage hardware designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT244N,652 | TTL-compatible inputs (VIH = 2.0 V min), identical pinout and output specs | Better suited for interfacing with legacy 5 V TTL logic families where input thresholds differ | Select when driving from 5 V TTL sources; avoid if interfacing only with CMOS or 3.3 V logic |
| SN74HC244N | Same HC logic family, identical electrical specs, but TI packaging and qualification (SOIC-20) | No functional difference; may differ in traceability, lot marking, or long-term availability | Use when dual-sourcing is required or TI's supply chain offers better lead times for production ramp |
Compared with 74HC244N,652, the 74HCT244N,652 provides guaranteed TTL-level input recognition at 5 V, while SN74HC244N offers identical functionality with alternate manufacturing traceability-both require no PCB changes but differ in input compatibility and supply-chain alignment.
Availability
74HC244N,652 is available at Aetrix Electronics and suitable for industrial control panels, legacy system upgrades, and microcontroller-based instrumentation requiring stable component supply across extended temperature ranges.
Supply support for 74HC244N,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 logic, analog, and discrete components with focus on efficiency and sustainability.
The 74HC244N,652 belongs to Nexperia's industry-standard HC logic family, designed for robust, low-power digital interfacing in industrial, consumer, and automotive-qualified systems.
FAQ
What is the maximum supply voltage rating for the 74HC244N,652?
The absolute maximum supply voltage (VCC) for the 74HC244N,652 is +7.0 V, but recommended operation is limited to 2.0 V to 6.0 V per datasheet Section 8. Exceeding 6.0 V risks accelerated aging and violates JEDEC JESD7A compliance. The 74HC244N,652 must not be operated continuously above 6.0 V even if below the 7.0 V limit.
Does the 74HC244N,652 support 3.3 V logic levels?
Yes - the 74HC244N,652 fully supports 3.3 V operation: VIH(min) = 2.1 V and VIL(max) = 1.35 V at VCC = 3.3 V (interpolated from Table 6), and VOH(min) = 3.15 V at IO = –6 mA. The 74HC244N,652 drives 3.3 V CMOS loads reliably and accepts standard 3.3 V logic inputs without level shifting.
Can the 74HC244N,652 drive LEDs directly?
Yes - each output of the 74HC244N,652 can sink or source up to ±35 mA (Section 7), sufficient for common indicator LEDs with appropriate current-limiting resistors. At VCC = 5 V and IO = 20 mA, VOL remains ≤ 0.26 V, ensuring >4.7 V forward bias across typical red/green LEDs. Always verify thermal dissipation in the SO20 package under sustained load.
Is the 74HC244N,652 pin-compatible with the 74HCT244N,652?
Yes - the 74HC244N,652 and 74HCT244N,652 share identical SO20 pinout, package dimensions, and output electrical characteristics. The only functional difference is input threshold compatibility: the 74HC244N,652 requires CMOS-level inputs, while the 74HCT244N,652 accepts TTL-level inputs. No PCB layout change is needed for substitution.
What is the thermal resistance (RθJA) of the 74HC244N,652 in SO20 package?
The datasheet does not specify RθJA for the 74HC244N,652 in SO20 (SOT163-1), but total power dissipation is rated at 500 mW with linear derating above 109 °C (Section 7, Note [1]). For thermal design, assume RθJA ≈ 220 K/W (typical for SO20 with minimal copper) and verify junction temperature using TJ = TA + (P × RθJA), where P = VCC × ICC + Σ(VCC² × f × CPD).
74HC244N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
74HC244N,652 FAQ
1.How can I place an order for 74HC244N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC244N,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 74HC244N,652 reliable?
The price and inventory of 74HC244N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC244N,652 is usually 5 days.
3.What payment methods are accepted for 74HC244N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC244N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC244N,652?
74HC244N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC244N,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 74HC244N,652?
For technical support, including 74HC244N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC244N,652 requirements.
6.How does Aetrix verify that 74HC244N,652 is sourced from the original manufacturer or authorized distributors?
All 74HC244N,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 74HC244N,652 meets industry standards.
7.What is the process for return or replacement of 74HC244N,652?
All 74HC244N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC244N,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 74HC244N,652 part is unused and in its original packaging.
Return procedure for 74HC244N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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