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onsemi MC74HC244ADW
- Part No.:
- MC74HC244ADW
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74HC244ADW.pdf
- Description:
- IC BUFF/DVR TRI-ST DUAL 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:23,472
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Product details
Overview
MC74HC244ADW from onsemi is an octal 3-state noninverting buffer/line driver/line receiver in SOIC-20 wide-body package, operating from 2.0 V to 6.0 V, delivering ±7.8 mA output drive per channel with 15 LSTTL load capability and propagation delay as low as 15 ns at 6.0 V - used for bidirectional bus interfacing in industrial control backplanes and memory address/data path isolation.
For engineers reviewing the MC74HC244ADW datasheet, pinout, applications, or equivalent options, key selection considerations include its dual active-low output enables (Enable A and Enable B), CMOS/TTL input compatibility with pullup resistors, 3-state output leakage ≤±10 µA at 125°C, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MC74HC244ADW implements two independent 4-bit noninverting buffer groups (A and B), each controlled by a dedicated active-low enable pin. Its inputs accept standard CMOS logic levels and - with external pullups - interface directly to LSTTL outputs, enabling mixed-logic-system bridging without level-shifting circuitry.
Each output supports high-impedance tri-state operation with guaranteed VOH ≥5.9 V and VOL ≤0.26 V at VCC = 6.0 V and |IOUT| = 7.8 mA, while maintaining input leakage ≤±1.0 µA and three-state output capacitance of 15 pF - critical for minimizing bus loading and signal integrity degradation in high-density PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports single-supply operation across legacy 5 V and modern low-voltage 3.3 V/2.5 V systems. |
| Output Drive Strength | ±7.8 mA per output at VCC = 6.0 V - drives 15 LSTTL loads, enabling direct fanout to multiple downstream TTL inputs. |
| Propagation Delay | 15 ns max (A→YA or B→YB) at VCC = 6.0 V - ensures timing-critical bus buffering with sub-20 ns latency. |
| Input Leakage Current | ≤±1.0 µA at 125°C - minimizes static power draw and prevents unintended logic transitions in high-temp environments. |
| Three-State Leakage | ≤±10 µA at 125°C - maintains clean bus isolation when outputs are disabled, preventing contention or crosstalk. |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and automotive under-hood applications. |
| ESD Rating | >2000 V HBM - provides robust handling during assembly and field service without additional protection circuitry. |
Pinout & Package
MC74HC244ADW uses the SOIC-20 wide-body (Case 751D) package, 12.8 mm × 7.5 mm × 2.65 mm, with 1.27 mm pitch, Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Enable A / Enable B | Active-low group enables: Pin 1 controls YA1–YA4; Pin 19 controls YB1–YB4 - allows independent bus segment gating. |
| 2, 4, 6, 8 | A1–A4 Inputs | Noninverting data inputs for first buffer group - routed to YA1–YA4 when Enable A = LOW. |
| 11, 13, 15, 17 | B1–B4 Inputs | Noninverting data inputs for second buffer group - routed to YB1–YB4 when Enable B = LOW. |
| 18, 16, 14, 12 | YA1–YA4 Outputs | Noninverting buffered outputs for A-group - enter high-impedance state when Enable A = HIGH. |
| 9, 7, 5, 3 | YB1–YB4 Outputs | Noninverting buffered outputs for B-group - enter high-impedance state when Enable B = HIGH. |
| 10 | GND | Ground reference for all logic and power domains - must be low-inductance connection to minimize noise coupling. |
| 20 | VCC | Positive supply rail - decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Octal 3-state noninverting architecture | Two independent 4-bit groups with separate enables - enables selective bus arbitration without external logic. |
| LSTTL load compatibility | Drives up to 15 LSTTL inputs per output - eliminates need for intermediate drivers in legacy system upgrades. |
| Wide VCC range (2.0–6.0 V) | Operates across 2.5 V, 3.3 V, and 5 V logic families - simplifies voltage-domain bridging in mixed-supply designs. |
| AEC-Q100 qualified (−Q variant) | Qualified for automotive applications including engine control modules and body electronics - includes PPAP documentation support. |
| Low input capacitance (10 pF) | Minimizes capacitive loading on upstream drivers - preserves signal edge rates in high-speed parallel buses. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy 24 V I/O expansion cards in programmable logic controller racks. IC Role / Device Role / Timing Role: Bidirectional bus buffer with independent group enables - separates address/data lines from field-side transceivers while maintaining timing integrity. Use Value: Prevents ground loop interference and protects MCU pins from ESD and overvoltage events via 3-state isolation during fault conditions. |
Use Scenario: Level translation between 3.3 V CAN controller and 5 V lamp driver ICs in vehicle lighting subsystems. IC Role / Device Role / Timing Role: Noninverting line driver with TTL-compatible inputs - interfaces low-voltage logic to higher-voltage peripheral drivers without external level shifters. Use Value: Enables direct connection to legacy 5 V lamp drivers while maintaining full 3.3 V MCU timing margins due to <15 ns propagation delay. |
| Memory Address Bus Driver | Test Equipment Signal Multiplexer |
Use Scenario: Driving 16-bit address lines from FPGA to multiple SRAM chips on a shared memory bus. IC Role / Device Role / Timing Role: Octal buffer with dual enables - segments address space into two 8-bit groups, allowing simultaneous access to two memory banks. Use Value: Eliminates bus contention during bank switching via synchronized 3-state control, reducing address setup/hold violations. |
Use Scenario: Routing DUT signals between multiple test instruments (oscilloscope, logic analyzer, power supply) in automated test fixtures. IC Role / Device Role / Timing Role: 3-state line receiver/buffer - selects one instrument's input path while isolating others electrically. Use Value: Provides galvanic isolation between instruments via high-impedance state, preventing measurement error from ground offset or signal injection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244N | Dual 4-bit enables; identical pinout but PDIP-20 package - no AEC-Q100 qualification. | Suitable for lab prototypes and non-automotive industrial use only. | Select SN74HC244N for cost-sensitive breadboard validation where wide-body SOIC mounting is not required. |
| MC74HC244ADTG | Same die, TSSOP-20 package (4.4 mm × 6.5 mm) - 45% smaller footprint, same electrical specs. | Preferred for space-constrained PCBs like portable test gear or compact ECUs. | Choose MC74HC244ADTG when board area is constrained and reflow soldering capability exists. |
Compared with SN74HC244N and MC74HC244ADTG, the MC74HC244ADW offers automotive-grade reliability via AEC-Q100 qualification and mechanical robustness from its wider SOIC body - making it optimal for production-grade industrial and automotive control modules where thermal cycling and vibration resistance are critical.
Availability
MC74HC244ADW is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and memory address bus drivers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MC74HC244ADW 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensors, and logic solutions for automotive, industrial, and cloud infrastructure markets.
The MC74HC244ADW belongs to onsemi's HC logic family - designed for high-noise-immunity, low-power, wide-voltage-range interfacing in mission-critical embedded systems where reliability and interoperability across logic families are essential.
FAQ
What is the maximum operating voltage for MC74HC244ADW?
The MC74HC244ADW supports a DC supply voltage range of 2.0 V to 6.0 V. At 6.0 V, it delivers full output drive strength (±7.8 mA) and minimum propagation delay (15 ns). Operation above 6.0 V risks permanent damage, as the absolute maximum rating is +6.5 V - exceeding this violates JEDEC Standard No. 7A compliance.
Does MC74HC244ADW support TTL-level inputs without pullup resistors?
No - MC74HC244ADW inputs are CMOS-compatible and require VIH ≥1.5 V at VCC = 2.0 V. For direct connection to standard TTL outputs (VOH ≈ 2.4 V), external pullup resistors are necessary to ensure reliable high-level recognition. The MC74HCT244A variant is recommended for native TTL input compatibility.
How are the two output enable pins (Enable A and Enable B) used in practice?
Enable A (Pin 1) controls YA1–YA4; Enable B (Pin 19) controls YB1–YB4. In bus applications, they allow independent gating of two 4-bit data lanes - e.g., separating address and control signals or enabling time-multiplexed access to two memory banks. Both must be LOW for full 8-bit operation.
Is MC74HC244ADW suitable for automotive applications?
Yes - the "−Q" suffix in MC74HC244ADWR2G−Q* denotes AEC-Q100 qualification, PPAP capability, and unique site/control change requirements. The MC74HC244ADW itself shares the same die and process; full automotive compliance requires ordering the −Q variant with documented PPAP artifacts.
What is the thermal resistance (θJA) of MC74HC244ADW in SOIC-20W package?
The junction-to-ambient thermal resistance (θJA) for MC74HC244ADW in SOIC-20 wide-body package is 96 °C/W, measured on a 76 mm × 114 mm FR4 board with 2-ounce copper, per JESD51-7. This value assumes minimal copper pour; adding thermal vias under the exposed pad (if present) or increasing copper area reduces effective θJA.
MC74HC244ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74HC244ADW FAQ
1.How can I place an order for MC74HC244ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC244ADW 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 MC74HC244ADW reliable?
The price and inventory of MC74HC244ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC244ADW is usually 5 days.
3.What payment methods are accepted for MC74HC244ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC244ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC244ADW?
MC74HC244ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC244ADW 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 MC74HC244ADW?
For technical support, including MC74HC244ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC244ADW requirements.
6.How does Aetrix verify that MC74HC244ADW is sourced from the original manufacturer or authorized distributors?
All MC74HC244ADW 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 MC74HC244ADW meets industry standards.
7.What is the process for return or replacement of MC74HC244ADW?
All MC74HC244ADW units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC244ADW, 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 MC74HC244ADW part is unused and in its original packaging.
Return procedure for MC74HC244ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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