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onsemi MC74HC244ADTR2
- Part No.:
- MC74HC244ADTR2
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74HC244ADTR2.pdf
- Description:
- IC BUF/DR/RCR TRI-ST OCT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,881
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Product details
Overview
MC74HC244ADTR2 from onsemi is an octal 3-state noninverting buffer/line driver/line receiver in TSSOP-20 package, operating from 2.0 V to 6.0 V, with dual active-low output enables (pins 1 and 19), 15 LSTTL load drive capability, and propagation delay as low as 15 ns at 6.0 V - used for bidirectional bus interfacing in industrial control backplanes.
For engineers reviewing the MC74HC244ADTR2 datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage range compatibility (2.0–6.0 V), dual independent 3-state control, CMOS/TTL input compatibility, high-noise-immunity operation, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MC74HC244ADTR2 implements two independent 4-bit noninverting buffer groups (A1–A4/YA1–YA4 and B1–B4/YB1–YB4), each controlled by its own active-low enable (Enable A on pin 1, Enable B on pin 19). It uses standard high-speed CMOS logic architecture with rail-to-rail input thresholds defined per VCC (VIH = 3.15 V min at VCC = 4.5 V).
Its 3-state outputs exhibit low leakage (IOZ ≤ ±10 µA at 125°C) and low output capacitance (COUT = 15 pF), enabling clean bus sharing without signal contention. The device meets JEDEC Std. No. 7A and supports operation from –55°C to +125°C ambient.
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-powered designs down to 2.0 V logic. |
| Propagation Delay (A→YA) | 15 ns max at VCC = 6.0 V - enables reliable timing in 33 MHz+ bus systems with margin. |
| Output Drive Strength | 15 LSTTL loads - sufficient to drive multiple legacy TTL inputs without external buffers. |
| Input Thresholds (VIH/VIL) | VIH = 4.2 V min, VIL = 1.8 V max at VCC = 6.0 V - ensures robust noise margin (>1.2 V) in noisy industrial environments. |
| 3-State Leakage Current | ±10 µA max at 125°C - prevents unintended current paths when outputs are disabled in high-temp applications. |
| Operating Temperature | –55°C to +125°C - qualified for under-hood automotive, industrial PLC, and aerospace avionics use. |
| ESD Rating | >2000 V HBM - withstands handling and board-level ESD events without latch-up or parametric shift. |
Pinout & Package
TSSOP-20 wide-body package (Case 948E), 6.5 mm × 4.4 mm footprint, 0.65 mm pitch, lead-free (Pb-free) and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Active-Low Output Enables | Enable A (pin 1) controls YA1–YA4; Enable B (pin 19) controls YB1–YB4 - allows independent gating of two 4-bit data lanes. |
| 2, 4, 6, 8 | Data Inputs A1–A4 | Noninverting inputs for first buffer group - directly connect to microcontroller port or address bus lines. |
| 11, 13, 15, 17 | Data Inputs B1–B4 | Noninverting inputs for second buffer group - supports dual-bus or mirrored signal routing. |
| 18, 16, 14, 12 | Outputs YA1–YA4 | 3-state noninverting outputs tied to Enable A - high-impedance when pin 1 = high. |
| 9, 7, 5, 3 | Outputs YB1–YB4 | 3-state noninverting outputs tied to Enable B - isolated from bus when pin 19 = high. |
| 20 | VCC | Positive supply rail - must be decoupled locally with 0.1 µF ceramic capacitor. |
| 10 | GND | Ground reference - shared return path for all inputs, outputs, and enables. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit buffering | Enables simultaneous control of two separate data paths (e.g., address/data split or master/slave isolation) without cross-talk. |
| CMOS/TTL-compatible inputs | Accepts both CMOS and LSTTL logic levels (with pullups), eliminating level-shifter requirements in mixed-technology systems. |
| High noise immunity | Guaranteed 40% VCC noise margin at 6.0 V supply - suppresses false triggering from EMI in motor drives or switching power supplies. |
| AEC-Q100 qualified (−Q variant) | MC74HC244ADTR2G−Q* version meets automotive stress testing (HTOL, TC, ESD) - suitable for ADAS sensor interfaces and body control modules. |
| Pb-free, halogen-free, RoHS | Fully compliant with EU RoHS Directive 2011/65/EU and JEDEC JS709E - supports green manufacturing and export compliance. |
Applications
| Industrial Backplane Interface | Automotive Sensor Hub |
|---|---|
Use Scenario: Isolating MCU GPIO banks from noisy 24 V I/O expansion modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer managing address/data multiplexing between ARM Cortex-M7 and isolated CAN/RS-485 transceivers. Use Value: Prevents bus contention during hot-swap insertion and reduces ground bounce via controlled output enable sequencing. | Use Scenario: Aggregating analog sensor signals (temperature, pressure, IMU) into a central domain controller in ADAS ECUs. IC Role / Device Role / Timing Role: Level-translating and buffering 3.3 V sensor outputs to 5 V ADC front-end while maintaining AEC-Q100 reliability. Use Value: Eliminates need for discrete level shifters and provides fail-safe high-impedance isolation during controller reset sequences. |
| Test Equipment Signal Routing | Legacy System Upgrade Adapter |
Use Scenario: Dynamically reconfiguring signal paths between FPGA-based pattern generators and DUT connectors in automated test fixtures. IC Role / Device Role / Timing Role: Low-propagation-delay 3-state switch enabling sub-20 ns path selection without skew-induced timing violations. Use Value: Supports 50 MHz digital stimulus generation with deterministic setup/hold margins across 16-channel parallel test vectors. | Use Scenario: Retrofitting obsolete TTL-based instrumentation with modern low-power microcontrollers while retaining existing PCB layout. IC Role / Device Role / Timing Role: Pin-compatible replacement for 74LS244 in memory address drivers and clock distribution networks. Use Value: Reduces system power by >80% versus LS logic while maintaining identical timing behavior and drive strength. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244PWR | TSSOP-20, same logic function and pinout, but TI-specified VIH/VIL thresholds differ slightly (VIH = 3.15 V min at 4.5 V vs. onsemi's 3.15 V); ICC = 80 µA max (vs. 160 µA). | Valid for commercial-grade industrial control where AEC-Q100 is not required; lacks −Q automotive qualification. | Select when sourcing from TI-authorized channels or when tighter quiescent current is prioritized over automotive qualification. |
| 74VHC244MTCX | TSSOP-20, identical pinout and function, but ON Semiconductor's VHC family offers faster tPLH (10 ns @ 5 V) and lower CIN (6 pF vs. 10 pF), with same 2.0–5.5 V range. | Better suited for high-frequency clock distribution (≥66 MHz) due to lower propagation delay and input capacitance. | Choose for timing-critical applications requiring <12 ns delay or reduced capacitive loading on driving nets. |
Compared with SN74HC244PWR and 74VHC244MTCX, the MC74HC244ADTR2 offers guaranteed AEC-Q100 qualification, wider 2.0–6.0 V operation, and higher temperature rating (125°C vs. 85°C for SN74HC244PWR), making it optimal for automotive and extended-temperature industrial deployments.
Availability
MC74HC244ADTR2 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive sensor hubs, automated test equipment, and legacy system upgrades requiring stable component supply and long-term lifecycle support.
Supply support for MC74HC244ADTR2 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The MC74HC244ADTR2 belongs to onsemi's HC logic family - designed for low-power, high-noise-immunity interfacing in harsh-environment systems where reliability, wide voltage operation, and AEC-Q100 compliance are critical.
FAQ
What is the maximum operating voltage for MC74HC244ADTR2?
The MC74HC244ADTR2 supports a DC supply voltage range of 2.0 V to 6.0 V. Its absolute maximum rating is +6.5 V, but sustained operation above 6.0 V violates recommended conditions and may impact reliability or parametric performance. At 6.0 V, propagation delay is minimized (15 ns), and output drive reaches 15 LSTTL loads - making this the optimal upper limit for performance-critical designs.
Does MC74HC244ADTR2 support TTL-level inputs without pull-up resistors?
No - MC74HC244ADTR2 inputs are CMOS-compatible and require VIH ≥ 3.15 V at VCC = 4.5 V. Standard TTL outputs (2.4 V VOH) fall below this threshold, so pull-up resistors to VCC are required for reliable interface. For native TTL compatibility, the pin-compatible MC74HCT244ADTR2 (4.5–5.5 V only) should be selected instead.
How many independent 3-state control groups does MC74HC244ADTR2 provide?
The MC74HC244ADTR2 provides two independent 3-state control groups: Enable A (pin 1) controls outputs YA1–YA4, and Enable B (pin 19) controls outputs YB1–YB4. This allows concurrent or staggered enable/disable of two 4-bit data lanes - essential for bus arbitration, memory banking, or dual-processor interconnects without external logic.
Is MC74HC244ADTR2 pin-compatible with the 74LS244?
Yes - the MC74HC244ADTR2 is explicitly designed to be pinout-identical to the 74LS244, including identical pin numbering and function mapping (e.g., A1 on pin 2, YA1 on pin 18, Enable A on pin 1). This enables drop-in replacement in legacy LS-based PCBs, provided supply voltage and timing margins are verified for the wider 2.0–6.0 V range.
What is the thermal resistance (θJA) of MC74HC244ADTR2 in its TSSOP-20 package?
The MC74HC244ADTR2 in TSSOP-20 package has a junction-to-ambient thermal resistance (θJA) of 150°C/W, measured per JESD51-7 on a standard FR4 board with minimum pad spacing and no airflow. At maximum rated power dissipation (833 mW), this yields a worst-case junction temperature rise of 125°C above ambient - aligning precisely with its +125°C maximum operating temperature rating.
MC74HC244ADTR2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
MC74HC244ADTR2 FAQ
1.How can I place an order for MC74HC244ADTR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC244ADTR2 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 MC74HC244ADTR2 reliable?
The price and inventory of MC74HC244ADTR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC244ADTR2 is usually 5 days.
3.What payment methods are accepted for MC74HC244ADTR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC244ADTR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC244ADTR2?
MC74HC244ADTR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC244ADTR2 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 MC74HC244ADTR2?
For technical support, including MC74HC244ADTR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC244ADTR2 requirements.
6.How does Aetrix verify that MC74HC244ADTR2 is sourced from the original manufacturer or authorized distributors?
All MC74HC244ADTR2 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 MC74HC244ADTR2 meets industry standards.
7.What is the process for return or replacement of MC74HC244ADTR2?
All MC74HC244ADTR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC244ADTR2, 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 MC74HC244ADTR2 part is unused and in its original packaging.
Return procedure for MC74HC244ADTR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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