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Nexperia USA Inc. 74HC244D,652
- Part No.:
- 74HC244D,652
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74HC244D,652.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,944
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Product details
Overview
74HC244D,652 from Nexperia is an octal non-inverting 3-state buffer/line driver in SO20 (SOT163-1) package, featuring dual independent output-enable controls (1OE, 2OE), CMOS-level input compatibility, 2.0–6.0 V supply range, and operation up to +125 °C - used for bidirectional bus interfacing in industrial control backplanes and legacy parallel data paths.
For engineers reviewing the 74HC244D,652 datasheet, 74HC244D,652 pinout, 74HC244D,652 application, or 74HC244D,652 equivalent, key selection considerations include 3-state timing (tpd ≤ 22 ns @ 4.5 V), output drive capability (±35 mA), input clamp diode support for overvoltage-tolerant interfacing, and thermal performance in SO20 at extended temperature.
Technical Context
This device implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low 3-state enable (1OE for Y0–Y3, 2OE for Y0–Y3 of second group). Each section drives four outputs with identical logic polarity and high-impedance OFF-state when its OE is HIGH.
Input clamping diodes allow safe interface to signals exceeding VCC (e.g., 5 V logic driving 3.3 V system), while static characteristics guarantee VIH ≥ 3.15 V and VOL ≤ 0.26 V at 4.5 V/−6 mA, supporting robust noise margins in mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports direct integration into 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | 9 ns (typ) @ VCC = 6.0 V - enables reliable operation in 50 MHz+ parallel bus timing budgets. |
| Output Drive Strength | ±35 mA - sufficient to drive 50 Ω transmission lines or multiple TTL loads without external buffers. |
| 3-State Enable Timing | ten = 10 ns, tdis = 11 ns @ VCC = 6.0 V - ensures clean bus arbitration with minimal bus contention window. |
| Input Clamp Current | ±20 mA - permits use of series current-limiting resistors for safe interfacing to voltages up to VCC + 0.5 V. |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood industrial and power-conversion control environments. |
| Power Dissipation (Ptot) | 500 mW (SO20) - derates linearly above 109 °C (12.3 mW/K), enabling thermal-aware PCB layout. |
Pinout & Package
74HC244D,652 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, with gull-wing leads and standard JEDEC pin 1 index marking.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low 3-state enables - independently disable first or second group of four outputs. |
| 2, 4, 6, 8 | 1A0–1A3 | Inputs for first buffer group - routed to outputs 1Y0–1Y3 when 1OE = LOW. |
| 18, 16, 14, 12 | 1Y0–1Y3 | Non-inverting buffered outputs of first group - high-impedance when 1OE = HIGH. |
| 17, 15, 13, 11 | 2A0–2A3 | Inputs for second buffer group - routed to outputs 2Y0–2Y3 when 2OE = LOW. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Non-inverting buffered outputs of second group - high-impedance when 2OE = HIGH. |
| 10 | GND | Reference ground plane - must be low-impedance for stable switching and EMI control. |
| 20 | VCC | Positive supply rail - decoupling capacitor (100 nF) required within 5 mm for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2.0–6.0 V operation eliminates need for separate voltage rails in multi-supply systems. |
| CMOS-Level Inputs | VIH ≥ 3.15 V @ 4.5 V ensures compatibility with 3.3 V microcontrollers and FPGA I/O banks. |
| Input Clamp Diodes | Enable safe interface to 5 V buses using simple series resistors - no external protection needed. |
| High Noise Immunity | Typical noise margin > 1.3 V at 4.5 V - suppresses false triggering in electrically noisy motor-control environments. |
| Latch-Up Robustness | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events. |
Applications
| Industrial Backplane Interface | Legacy Parallel Printer Port |
|---|---|
|
Use Scenario: Isolating microcontroller GPIO from noisy 24 V PLC I/O modules via optocoupler-coupled 5 V bus. IC Role / Device Role: Bidirectional 3-state buffer enabling shared data/address lines between isolated domains. Use Value: Dual OE pins allow precise timing control of bus direction changes, eliminating contention during state transitions. |
Use Scenario: Extending parallel printer port signal integrity across 30 cm ribbon cable in embedded kiosk systems. IC Role / Device Role: Line driver boosting slew rate and current drive to meet IEEE 1284 timing requirements. Use Value: 35 mA output sink/source capability maintains valid logic levels despite 50 pF cable capacitance and stub reflections. |
| Microcontroller Bus Expansion | Test Equipment Signal Routing |
|
Use Scenario: Adding eight general-purpose I/O lines to an ARM Cortex-M0+ MCU with limited GPIO count. IC Role / Device Role: Non-inverting buffer providing additional drive strength and isolation for peripheral control signals. Use Value: Low propagation delay (9 ns typ) preserves timing margins in real-time control loops running at 10 kHz update rates. |
Use Scenario: Multiplexing DUT signals between multiple test instruments in automated bench setups. IC Role / Device Role: 3-state switch enabling dynamic reconfiguration of signal paths without physical rewiring. Use Value: Independent OE control allows glitch-free switching between instrument channels with <11 ns disable time. |
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 |
|---|---|---|---|
| SN74HC244N | Dual-in-line (PDIP20) package; higher thermal resistance (θJA = 70 °C/W vs. 55 °C/W for SO20); same electrical specs. | Suitable for prototyping or through-hole assembly; not recommended for high-density or thermally constrained PCBs. | Select when manual soldering or breadboard validation is required; avoid for production SMT designs. |
| 74HCT244D | TTL-compatible inputs (VIH = 2.0 V min); identical pinout and timing; slightly higher ICC at 5.5 V. | Better interoperability with legacy 5 V TTL logic families; less suitable for pure CMOS systems below 3.3 V. | Choose when interfacing to 74LS or older microcontrollers with weak high-level output drive. |
Compared with SN74HC244N and 74HCT244D, the 74HC244D,652 offers superior thermal performance in surface-mount layouts and native CMOS input thresholds ideal for modern low-voltage MCUs - making it optimal for volume industrial PCBs requiring long-term reliability and compact footprint.
Availability
74HC244D,652 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy parallel port extensions, microcontroller bus expansion, and automated test equipment signal routing requiring stable component supply across extended temperature ranges.
Supply support for 74HC244D,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 logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume applications.
The 74HC244D,652 belongs to Nexperia's HC-series logic family, designed specifically for robust, low-power, wide-voltage-range interfacing in industrial automation, building control, and legacy system upgrades.
FAQ
Can 74HC244D,652 operate reliably at 3.3 V supply?
Yes. The 74HC244D,652 is fully specified from 2.0 V to 6.0 V, with guaranteed VIH ≥ 2.4 V and VOL ≤ 0.26 V at 3.3 V/−6 mA. Propagation delay is 13 ns (typ) at 3.3 V, supporting 30+ MHz bus operation. Input clamp diodes remain functional, allowing safe interface to 5 V signals via current-limiting resistors.
What is the maximum capacitive load this device can drive without signal degradation?
The 74HC244D,652 is characterized up to 50 pF load capacitance in dynamic testing (Table 9). With CL = 50 pF and VCC = 4.5 V, tpd remains ≤ 28 ns and tt ≤ 15 ns. For loads >50 pF, rise/fall times increase linearly; design margin requires limiting total trace + stub + receiver capacitance to ≤45 pF for sub-20 ns timing compliance.
How does the dual OE architecture improve system-level bus control?
Dual OE (1OE and 2OE) enables independent gating of two 4-bit groups, allowing partial bus updates without full cycle stalls. For example, in a 16-bit address/data multiplexed bus, one OE can hold address lines stable while the other toggles data - reducing bus turnaround time by up to 40% versus single-OE octal buffers.
Is thermal pad connection required for the SO20 package?
No. The SO20 (SOT163-1) package has no exposed thermal pad. Thermal dissipation relies on copper pour under pins 10 (GND) and 20 (VCC), with recommended 250 mm² minimum 2-oz copper area per rail. Junction-to-ambient θJA is 55 °C/W with 250 mm² double-sided copper, enabling 400 mW continuous operation at +85 °C ambient.
74HC244D,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 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-SO
74HC244D,652 FAQ
1.How can I place an order for 74HC244D,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC244D,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 74HC244D,652 reliable?
The price and inventory of 74HC244D,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC244D,652 is usually 5 days.
3.What payment methods are accepted for 74HC244D,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC244D,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC244D,652?
74HC244D,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC244D,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 74HC244D,652?
For technical support, including 74HC244D,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC244D,652 requirements.
6.How does Aetrix verify that 74HC244D,652 is sourced from the original manufacturer or authorized distributors?
All 74HC244D,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 74HC244D,652 meets industry standards.
7.What is the process for return or replacement of 74HC244D,652?
All 74HC244D,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC244D,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 74HC244D,652 part is unused and in its original packaging.
Return procedure for 74HC244D,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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