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onsemi MC74HC244ADWR2G-Q
- Part No.:
- MC74HC244ADWR2G-Q
- Manufacturer:
- onsemi
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC74HC244ADWR2G-Q.pdf
- Description:
- OCTAL 3-STATE NON-INVERTING BUFF
- Quantity:
- Payment:
- Shipping:
Inventory:1,817
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Product details
Overview
MC74HC244ADWR2G-Q from onsemi is an automotive-grade octal 3-state noninverting buffer/line driver with dual active-low output enables, operating from 2.0 V to 6.0 V, delivering ±7.8 mA output drive per pin and 15 LSTTL load capability - used in bidirectional bus interfacing, memory address buffering, and clock distribution systems.
For engineers reviewing the MC74HC244ADWR2G-Q datasheet, pinout, applications, or equivalent options, key selection factors include its AEC-Q100 qualification, SOIC-20 wide-body package, 125°C max operating temperature, and compatibility with both CMOS and LSTTL logic families via pullup resistors.
Technical Context
The MC74HC244ADWR2G-Q implements two independent 4-bit noninverting buffer groups (A and B), each controlled by a dedicated active-low enable (Enable A on Pin 1, Enable B on Pin 19). Its inputs accept standard CMOS levels and - with external pullups - interface directly to LSTTL outputs.
Each output supports high-impedance tri-state operation, enabling shared-bus architectures without contention. Propagation delays are specified at 15 ns (max) at VCC = 6.0 V and 23 ns (max) at VCC = 4.5 V, with output transition times as low as 10 ns under same conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-backed operation down to 2.0 V. |
| Output Drive Current | ±7.8 mA per pin at VCC = 6.0 V - drives 15 LSTTL loads without external buffers. |
| Propagation Delay | 15 ns max (A→YA or B→YB, VCC = 6.0 V) - enables reliable timing in 33 MHz+ bus systems. |
| Input Leakage Current | ±1.0 µA max at 125°C - ensures stable logic levels in high-temperature automotive environments. |
| Three-State Leakage | ±10 µA max at 125°C - prevents unintended current paths during bus arbitration. |
| Operating Temperature | –55°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood automotive electronics. |
| ESD Rating | >2000 V HBM - provides robust handling during assembly and field service. |
Pinout & Package
MC74HC244ADWR2G-Q is housed in a Pb-free, RoHS-compliant SOIC-20 wide-body (Case 751D) package measuring 12.8 mm × 7.5 mm × 2.35 mm, with 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Enable A / Enable B | Active-low enables for Group A (Pins 2,4,6,8 → YA1–YA4) and Group B (Pins 11,13,15,17 → YB1–YB4). |
| 2,4,6,8 | A1–A4 Inputs | Noninverting data inputs for first buffer group; drive YA1–YA4 when Enable A = LOW. |
| 11,13,15,17 | B1–B4 Inputs | Noninverting data inputs for second buffer group; drive YB1–YB4 when Enable B = LOW. |
| 18,16,14,12 | YA1–YA4 Outputs | Tri-state noninverting outputs for Group A; high-impedance when Enable A = HIGH. |
| 9,7,5,3 | YB1–YB4 Outputs | Tri-state noninverting outputs for Group B; high-impedance when Enable B = HIGH. |
| 20 | VCC | Positive supply rail (2.0–6.0 V); decoupling capacitor required within 10 mm. |
| 10 | GND | Ground reference for all I/O and supply; must connect to low-impedance PCB plane. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Qualification | AEC-Q100 Grade 1 qualified and PPAP capable - validated for engine control, body electronics, and ADAS subsystems. |
| Bus-Friendly Output Control | Dual independent 3-state enables allow interleaved or simultaneous bus access without contention. |
| Wide-Voltage Operation | 2.0–6.0 V supply range supports legacy 5 V, modern 3.3 V, and low-power 2.5 V designs without level shifters. |
| High Noise Immunity | CMOS input structure with >40% VCC noise margin ensures reliable operation in electrically noisy vehicle cabins. |
| Pb-Free & Halogen-Free | RoHS-compliant construction with halogen-free molding compound - meets automotive ELV Directive requirements. |
Applications
| Engine Control Unit (ECU) Address Buffering | Instrument Cluster Display Interface |
|---|---|
Use Scenario: Isolating microcontroller address/data bus from external flash memory and CAN transceiver peripherals in a Tier-1 ECU. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing bidirectional isolation and timing-controlled bus release during memory read/write cycles. Use Value: Enables deterministic bus arbitration with <15 ns propagation delay and guaranteed 125°C operation under hood. |
Use Scenario: Driving segmented LCD or LED backlight drivers from a low-voltage MCU in a digital instrument cluster. IC Role / Device Role / Timing Role: Level-shifting buffer translating 3.3 V MCU GPIOs to 5 V display driver inputs while maintaining signal integrity. Use Value: Eliminates need for discrete level shifters; ±7.8 mA drive supports direct connection to LED sink drivers. |
| Automotive Infotainment Audio Bus | Body Control Module (BCM) Sensor Hub |
Use Scenario: Interfacing multiple audio codec ICs to a central DSP over a shared I²S/PCM bus in head unit design. IC Role / Device Role / Timing Role: Tri-state line driver managing bus contention between codec transmit/receive paths using Enable A/B control. Use Value: Dual-enable architecture allows precise time-multiplexed access without external logic or timing glue. |
Use Scenario: Aggregating analog sensor signals (temperature, humidity, door switch status) into a centralized BCM microcontroller. IC Role / Device Role / Timing Role: Input buffer conditioning and isolating noisy mechanical switch inputs before ADC sampling. Use Value: High noise immunity (>40% VCC margin) and ±1.0 µA leakage prevent false triggers in harsh 12 V automotive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC74HC244ADWG-Q | Same die, SOIC-20 wide-body rail-packaged variant; identical electrical specs and AEC-Q100 qualification. | No tape-and-reel; suited for prototyping and low-volume manual assembly. | Select when small-batch evaluation or hand-soldering is required - no change in circuit design or layout. |
| SN74HCT244QPWRQ1 | TTL-compatible inputs (VIH = 2.0 V min), 4.5–5.5 V only; faster propagation (20 ns max at 5 V) but narrower voltage range. | Optimized for 5 V-only systems with legacy TTL sources; not suitable for 2.0–3.3 V mixed-voltage buses. | Choose only if interfacing exclusively with 5 V TTL logic and requiring sub-25 ns timing - requires VCC constraint and input voltage validation. |
Compared with MC74HC244ADWR2G-Q, MC74HC244ADWG-Q offers identical performance in rail packaging for development use, while SN74HCT244QPWRQ1 trades voltage flexibility for tighter timing in pure 5 V automotive domains - neither is pin-compatible without verifying enable polarity and thermal pad presence.
Availability
MC74HC244ADWR2G-Q is available at Aetrix Electronics and suitable for automotive ECU design, instrument cluster integration, infotainment bus management, and body control module development requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74HC244ADWR2G-Q 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 is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC74HC244ADWR2G-Q belongs to onsemi's automotive-qualified HC logic family, designed specifically for robust, high-reliability signal buffering in safety-critical vehicle subsystems operating from –55°C to +125°C.
FAQ
What is the maximum operating temperature for MC74HC244ADWR2G-Q?
The MC74HC244ADWR2G-Q is rated for continuous operation from –55°C to +125°C ambient, meeting AEC-Q100 Grade 1 requirements. This specification is verified across all electrical parameters in the datasheet's Recommended Operating Conditions table and confirmed in thermal derating curves for SOIC-20 packages.
Does MC74HC244ADWR2G-Q support 3.3 V logic interfacing?
Yes, MC74HC244ADWR2G-Q operates reliably at 3.3 V supply (within its 2.0–6.0 V range), with VIH = 2.1 V min and VIL = 0.9 V max at VCC = 3.0 V - fully compatible with standard 3.3 V CMOS outputs and tolerant of LSTTL outputs when pullup resistors are applied.
Is MC74HC244ADWR2G-Q pin-compatible with the LS244?
Yes, MC74HC244ADWR2G-Q is explicitly stated in the datasheet to be identical in pinout to the 74LS244. All 20 pins - including VCC (Pin 20), GND (Pin 10), dual enables (Pins 1 and 19), and grouped I/Os - match the industry-standard LS244 layout, enabling drop-in replacement in legacy designs.
What does the "–Q" suffix indicate on MC74HC244ADWR2G-Q?
The "–Q" suffix denotes that MC74HC244ADWR2G-Q is manufactured under onsemi's automotive quality program: it is AEC-Q100 qualified, PPAP-capable, and subject to unique site and process control change requirements - including enhanced traceability, lot-level testing, and extended reliability monitoring beyond commercial-grade variants.
Can MC74HC244ADWR2G-Q drive LEDs directly?
MC74HC244ADWR2G-Q can drive LEDs in sink configuration (output low) with up to 7.8 mA per pin at VCC = 6.0 V, sufficient for indicator LEDs with appropriate series resistors. However, it is not designed as a constant-current LED driver - thermal limits and output voltage drop must be verified per channel under actual load conditions.
MC74HC244ADWR2G-Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
MC74HC244ADWR2G-Q FAQ
1.How can I place an order for MC74HC244ADWR2G-Q through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC244ADWR2G-Q 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 MC74HC244ADWR2G-Q reliable?
The price and inventory of MC74HC244ADWR2G-Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC244ADWR2G-Q is usually 5 days.
3.What payment methods are accepted for MC74HC244ADWR2G-Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC244ADWR2G-Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC244ADWR2G-Q?
MC74HC244ADWR2G-Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC244ADWR2G-Q 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 MC74HC244ADWR2G-Q?
For technical support, including MC74HC244ADWR2G-Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC244ADWR2G-Q requirements.
6.How does Aetrix verify that MC74HC244ADWR2G-Q is sourced from the original manufacturer or authorized distributors?
All MC74HC244ADWR2G-Q 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 MC74HC244ADWR2G-Q meets industry standards.
7.What is the process for return or replacement of MC74HC244ADWR2G-Q?
All MC74HC244ADWR2G-Q units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC244ADWR2G-Q, 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 MC74HC244ADWR2G-Q part is unused and in its original packaging.
Return procedure for MC74HC244ADWR2G-Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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