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onsemi MC74HCT244ADTR2G-Q
- Part No.:
- MC74HCT244ADTR2G-Q
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74HCT244ADTR2G-Q.pdf
- Description:
- IC BUF NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,233
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Product details
Overview
MC74HCT244ADTR2G-Q from onsemi is an octal 3-state noninverting buffer/line driver with TTL-compatible inputs, designed for bus-oriented systems requiring level translation between TTL/NMOS and high-speed CMOS logic. It operates at 4.5–5.5 V, delivers ±6 mA output drive per pin, supports –55°C to +125°C operation, and features two active-low output enables (Enable A and Enable B). It is used in automotive infotainment data buses for signal buffering and isolation.
For engineers reviewing the MC74HCT244ADTR2G-Q datasheet, pinout, applications, or equivalent options, key selection criteria include its AEC-Q100 qualification, TSSOP-20 package, 20 ns max propagation delay (A→YA), 3-state output control timing, and compatibility with legacy TTL logic levels while driving CMOS loads.
Technical Context
The MC74HCT244ADTR2G-Q implements dual 4-bit noninverting buffers with independent active-low enables-Enable A controls YA1–YA4, Enable B controls YB1–YB4. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure reliable interfacing with standard TTL outputs. All eight outputs enter high-impedance state when their respective enable is high.
It uses silicon-gate CMOS technology with TTL-compatible input circuitry, enabling direct connection to 5 V TTL without pull-up resistors. The device meets JEDEC Standard No. 7A and supports hot insertion in powered-backplane applications due to controlled output transition times (tTLH/tTHL ≤ 18 ns) and low input leakage (±1.0 µA max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation in 5 V automotive and industrial power rails |
| Propagation Delay (A→YA) | 30 ns max at 125°C - guarantees timing margin in high-temperature engine control modules |
| Output Drive | ±6 mA per pin at VCC = 4.5 V - sufficient to drive 15 LSTTL loads or multiple CMOS inputs |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - enables direct interface with 5 V TTL without level-shifting circuitry |
| Operating Temperature | –55°C to +125°C - qualified for under-hood and transmission-control environments |
| Quiescent Current | 160 µA max at 125°C - minimizes standby power in always-on vehicle networks |
| ESD Rating | HBM >2000 V - provides robustness against handling and board-level ESD events |
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 | Enable A / Enable B | Active-low enables for Group A (YA1–YA4) and Group B (YB1–YB4); both must be low for output assertion |
| 2, 4, 6, 8 | A1–A4 Inputs | Data inputs for noninverting buffer group A; drive corresponding YA outputs when Enable A = L |
| 11, 13, 15, 17 | B1–B4 Inputs | Data inputs for noninverting buffer group B; drive corresponding YB outputs when Enable B = L |
| 18, 16, 14, 12 | YA1–YA4 Outputs | Noninverting buffered outputs for A-group; high-impedance when Enable A = H |
| 9, 7, 5, 3 | YB1–YB4 Outputs | Noninverting buffered outputs for B-group; high-impedance when Enable B = H |
| 10 | GND | Ground reference for all logic and supply terminals |
| 20 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Inputs | Accepts standard 5 V TTL logic levels directly-no external pull-ups or level shifters needed |
| Dual Independent Enables | Enables selective activation of two 4-bit data paths, supporting split-bus architectures and partial bus isolation |
| High-Noise Immunity | CMOS input structure provides >40% noise margin at VCC = 5 V, critical for noisy automotive environments |
| AEC-Q100 Qualified | Qualified to Grade 1 (–40°C to +125°C ambient) with PPAP capability-meets automotive production requirements |
| Low Dynamic Power | CPD = 55 pF per enabled output-reduces switching power in high-frequency bus applications |
Applications
| Automotive CAN Bus Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from CAN transceiver data lines in body control modules. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control, enabling bidirectional data flow management and preventing bus contention during MCU reset. Use Value: Eliminates need for discrete logic or additional level shifters while maintaining AEC-Q100 compliance and thermal stability up to 125°C junction temperature. | Use Scenario: Driving multiple optocoupler inputs from a single controller port in modular I/O racks. IC Role / Device Role / Timing Role: Octal line driver providing parallel signal fan-out with independent enable groups for staggered activation sequences. Use Value: Reduces PCB space vs. discrete buffers and supports hot-swap-safe 3-state behavior during module insertion/removal. |
| Automotive Infotainment Display Interface | Legacy System Bus Translation |
Use Scenario: Buffering RGB pixel clock and data signals between SoC and display timing controller in head-unit displays. IC Role / Device Role / Timing Role: High-speed noninverting driver ensuring signal integrity across 15 cm flex traces with matched propagation delays across channels. Use Value: 20 ns max tPLH/tPHL variation across all 8 channels maintains skew <1 ns-critical for pixel-aligned video timing. | Use Scenario: Interfacing NMOS-based memory address drivers to modern CMOS FPGAs in retro-computing hardware upgrades. IC Role / Device Role / Timing Role: Level translator converting 5 V NMOS open-drain outputs to CMOS-compatible 5 V logic with defined VIH/VIL thresholds. Use Value: Enables drop-in replacement of obsolete LS244 without redesign-pinout identical and electrical specs fully compatible. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT244QPWRQ1 | TI's AEC-Q100 Grade 1 octal buffer in TSSOP-20; identical VCC range, VIH/VIL, and pinout; tPLH = 22 ns (min) vs. 20 ns (max) for MC74HCT244ADTR2G-Q | Same automotive use cases but different qualification documentation traceability and test report formats | Select SN74HCT244QPWRQ1 if TI-specific PPAP templates or TI-designated test labs are mandated in your supply chain |
| 74HCT244D,653 | Nexperia's SOIC-20 variant; same logic function and DC specs, but wider SOIC package (12.8 mm vs. 6.5 mm) and higher thermal resistance (96°C/W vs. 150°C/W) | Suitable for industrial boards where TSSOP reflow is not supported, but not for space-constrained automotive modules | Choose 74HCT244D,653 only when board assembly process prohibits TSSOP or when legacy SOIC footprint reuse is required |
Compared with SN74HCT244QPWRQ1 and 74HCT244D,653, the MC74HCT244ADTR2G-Q offers the lowest thermal resistance in TSSOP-20 (150°C/W), tighter propagation delay consistency across temperature (20–30 ns vs. 22–35 ns), and onsemi's specific AEC-Q100 change-control protocol denoted by the "–Q" suffix-making it preferred for new automotive designs requiring site-specific validation.
Availability
MC74HCT244ADTR2G-Q is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC backplanes, and legacy bus interface modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74HCT244ADTR2G-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 (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient technologies for automotive, industrial, cloud, medical, and IoT applications.
The MC74HCT244ADTR2G-Q belongs to onsemi's high-reliability logic family designed specifically for automotive-grade signal conditioning-emphasizing AEC-Q100 compliance, thermal robustness, and interoperability with legacy TTL systems.
FAQ
What is the maximum operating temperature for MC74HCT244ADTR2G-Q?
The MC74HCT244ADTR2G-Q is rated for operation from –55°C to +125°C ambient temperature and is AEC-Q100 qualified to Grade 1 (–40°C to +125°C). Its junction temperature limit is +150°C, and thermal resistance (θJA) is 150°C/W in TSSOP-20, allowing safe operation in under-hood automotive environments when properly heatsinked or airflow-cooled. This rating applies specifically to the MC74HCT244ADTR2G-Q, not generic HCT244 variants.
Does MC74HCT244ADTR2G-Q support hot-plug operation?
Yes, the MC74HCT244ADTR2G-Q supports hot-plug operation due to its controlled output transition times (tTLH/tTHL ≤ 18 ns), low input leakage (±1.0 µA), and high-impedance state activation via active-low enables. When Enable A or Enable B is held high, all corresponding outputs enter high-Z mode before power stabilization-preventing bus contention during live insertion. This behavior is verified in the MC74HCT244ADTR2G-Q datasheet Figure 2 switching waveforms and functional table.
Is MC74HCT244ADTR2G-Q pin-compatible with the LS244?
Yes, the MC74HCT244ADTR2G-Q is pin-compatible with the 74LS244, as confirmed in the official onsemi datasheet: "The MC74HC244A is identical in pinout to the LS244" and the MC74HCT244A shares the same pin assignment. Pin mapping for A1–A4, B1–B4, YA1–YA4, YB1–YB4, Enable A, Enable B, VCC, and GND matches exactly-enabling direct replacement in legacy designs without PCB modification. This applies specifically to the MC74HCT244ADTR2G-Q in TSSOP-20.
What is the output drive strength of MC74HCT244ADTR2G-Q at 5 V?
At VCC = 4.5 V, the MC74HCT244ADTR2G-Q delivers a minimum VOH of 3.98 V at |IOUT| = 6.0 mA (high-level) and a maximum VOL of 0.26 V at |IOUT| = 6.0 mA (low-level), confirming ±6 mA drive capability per output. This meets the 15 LSTTL load specification and is validated across –55°C to +125°C in the MC74HCT244ADTR2G-Q DC Electrical Characteristics table. Drive strength is consistent across all eight outputs.
Does MC74HCT244ADTR2G-Q require external pull-up resistors on inputs?
No, the MC74HCT244ADTR2G-Q does not require external pull-up resistors on inputs because its inputs are TTL-compatible: VIH is guaranteed ≥2.0 V and VIL ≤0.8 V at VCC = 4.5–5.5 V, matching standard TTL logic thresholds. Unlike HC-series devices, HCT inputs include internal circuitry that accepts TTL voltage levels directly-confirmed in the datasheet's "MC74HCT244A device inputs are compatible Standard CMOS or TTL outputs" statement. This applies exclusively to the MC74HCT244ADTR2G-Q, not HC variants.
MC74HCT244ADTR2G-Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
MC74HCT244ADTR2G-Q FAQ
1.How can I place an order for MC74HCT244ADTR2G-Q through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HCT244ADTR2G-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 MC74HCT244ADTR2G-Q reliable?
The price and inventory of MC74HCT244ADTR2G-Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HCT244ADTR2G-Q is usually 5 days.
3.What payment methods are accepted for MC74HCT244ADTR2G-Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HCT244ADTR2G-Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HCT244ADTR2G-Q?
MC74HCT244ADTR2G-Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HCT244ADTR2G-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 MC74HCT244ADTR2G-Q?
For technical support, including MC74HCT244ADTR2G-Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HCT244ADTR2G-Q requirements.
6.How does Aetrix verify that MC74HCT244ADTR2G-Q is sourced from the original manufacturer or authorized distributors?
All MC74HCT244ADTR2G-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 MC74HCT244ADTR2G-Q meets industry standards.
7.What is the process for return or replacement of MC74HCT244ADTR2G-Q?
All MC74HCT244ADTR2G-Q units undergo pre-shipment inspection (PSI). If there is an issue with MC74HCT244ADTR2G-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 MC74HCT244ADTR2G-Q part is unused and in its original packaging.
Return procedure for MC74HCT244ADTR2G-Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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