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onsemi MC74HC244ADTEL
- Part No.:
- MC74HC244ADTEL
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74HC244ADTEL.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:78,000
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Product details
Overview
MC74HC244ADTEL from onsemi is an octal noninverting 3-state buffer/line driver with two active-low output enables (Enable A, Enable B), designed for bus-oriented systems including memory address drivers and clock distribution. It operates from 2 V to 6 V, drives up to 15 LSTTL loads, features 1 µA max input current, and supports –55 °C to +125 °C industrial temperature range.
For engineers reviewing the MC74HC244ADTEL datasheet, pinout, applications, or equivalent options, key selection criteria include dual independent 4-bit enable control, high-noise-immunity CMOS inputs compatible with LSTTL (with pullups), 3-state output leakage < ±10 µA at 125 °C, and SOIC-Wide-20 package compatibility with legacy LS244 layouts.
Technical Context
The MC74HC244ADTEL implements eight independent noninverting buffers partitioned into two groups (A1–A4/YA1–YA4 and B1–B4/YB1–YB4), each controlled by a dedicated active-low enable. Its silicon-gate CMOS architecture ensures rail-to-rail output swing and low quiescent ICC (≤160 µA at 6 V, 125 °C).
Each buffer provides symmetrical propagation delays (tPLH/tPHL ≤23 ns at VCC = 4.5 V, CL = 50 pF) and fast output transition times (tTLH/tTHL ≤15 ns under same conditions), with guaranteed 3-state disable timing (tPLZ/tPHZ ≤28 ns). Input thresholds meet JEDEC Std. 7A for mixed-voltage interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports single-supply operation across 3.3 V and 5 V logic domains |
| Output Drive | 15 LSTTL loads - sufficient to drive standard TTL fanout without buffering |
| Input Leakage Current | ±1.0 µA max at 125 °C - ensures stable logic levels in high-temp industrial environments |
| Propagation Delay | ≤23 ns at 4.5 V (A→YA/B→YB) - enables reliable operation in 20+ MHz bus systems |
| 3-State Leakage | ±10 µA max at 125 °C - minimizes bus contention current when outputs are disabled |
| Operating Temperature | –55 °C to +125 °C - qualified for extended industrial and automotive under-hood applications |
| Input Capacitance | 10 pF max - reduces capacitive loading on driving sources and improves signal integrity |
Pinout & Package
MC74HC244ADTEL is supplied in SOIC-Wide-20 (Case 751D, DW suffix), with 1.27 mm pitch, 7.62 mm body width, and 25.66–27.17 mm length. Pin 1 is index-marked; Pin 10 = GND; Pin 20 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Enable A / Enable B | Active-low group enables - independently control YA1–YA4 and YB1–YB4 3-state output states |
| 2, 4, 6, 8 | A1–A4 Inputs | Data inputs for first buffer group - noninverted pass-through to YA1–YA4 when Enable A = L |
| 11, 13, 15, 17 | B1–B4 Inputs | Data inputs for second buffer group - noninverted pass-through to YB1–YB4 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 - must be connected to system common return path |
| 20 | VCC | Positive supply - decoupling capacitor (0.1 µF) required near pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Pinout compatibility | Identical to 74LS244 - enables drop-in replacement in legacy TTL designs without PCB change |
| Input voltage compatibility | CMOS-level inputs; LSTTL-compatible with pullup resistors - simplifies mixed-logic interfacing |
| Noise immunity | High noise margin inherent to CMOS - tolerates >40% VCC noise on inputs at 5 V |
| JEDEC compliance | Fully compliant with JEDEC Standard No. 7A - ensures interoperability with industry-standard logic families |
| Low power consumption | Quiescent ICC ≤160 µA at 6 V/125 °C - reduces thermal load in dense PCB layouts |
Applications
| Memory Address Buffering | Microcontroller Bus Expansion |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating MCU address outputs and enabling time-multiplexed access to multiple memory chips. Use Value: Dual enable pins allow independent gating of upper/lower address byte groups, reducing bus contention during memory page switching. | Use Scenario: Expanding GPIO count of an 8-bit MCU by connecting parallel peripherals (LCD, keypad, ADC) via shared data/address bus. IC Role / Device Role / Timing Role: Bidirectional bus driver providing level translation and drive strength enhancement between MCU and peripheral modules. Use Value: 15-LSTTL load drive capability eliminates need for additional line drivers, simplifying BOM and layout. |
| Industrial PLC I/O Module | Test Equipment Signal Routing |
Use Scenario: Isolating and conditioning digital control signals (e.g., relay drivers, sensor inputs) in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Industrial-grade buffer with –55 °C to +125 °C operation, providing ESD-protected signal conditioning before FPGA or microprocessor interfaces. Use Value: Guaranteed 3-state leakage < ±10 µA at 125 °C prevents false triggering in high-temperature cabinet environments. | Use Scenario: Dynamically routing test patterns from pattern generators to DUT pins in automated test equipment (ATE) systems. IC Role / Device Role / Timing Role: High-speed 3-state switch enabling multiplexed signal paths with minimal propagation delay skew (<23 ns). Use Value: Matched tPLH/tPHL ensures deterministic timing alignment across all 8 channels, critical for synchronized stimulus delivery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal noninverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC244N | Dual enable pins; identical AC/DC specs; PDIP-20 package only | Lacks SOIC-Wide-20 option - unsuitable for surface-mount production | Select when through-hole assembly or legacy socket compatibility is required |
| 74VHC244M | Higher speed (tPD ≤11 ns @ 5 V); lower ICC (≤20 µA typ); same pinout | Optimized for high-frequency clock distribution - not recommended for high-temp industrial use (>85 °C) | Select when sub-20 ns propagation delay is mandatory and operating temperature stays ≤85 °C |
Compared with SN74HC244N and 74VHC244M, the MC74HC244ADTEL uniquely combines SOIC-Wide-20 packaging, full –55 °C to +125 °C qualification, and proven field reliability in industrial control systems - making it the preferred choice for ruggedized embedded designs requiring long-term supply stability.
Availability
MC74HC244ADTEL is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus expansion, industrial PLC I/O modules, and test equipment signal routing requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MC74HC244ADTEL 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 manufacturer specializing in energy-efficient, high-performance analog, logic, and discrete components for automotive, industrial, cloud power, and sensing applications.
The MC74HC244ADTEL belongs to the HC logic family, engineered for robustness in harsh environments and designed specifically for bus interface, memory addressing, and signal isolation in industrial automation and embedded control systems.
FAQ
What is the maximum operating voltage for the MC74HC244ADTEL?
The MC74HC244ADTEL has a maximum DC supply voltage (VCC) rating of +7.0 V, but its recommended operating range is 2.0 V to 6.0 V per JEDEC Std. 7A. Operation above 6.0 V may cause accelerated aging or parametric shift; sustained use beyond 7.0 V risks permanent damage. The MC74HC244ADTEL is commonly deployed at 5.0 V in industrial systems and 3.3 V in mixed-signal applications.
Does the MC74HC244ADTEL support LSTTL input compatibility without external components?
The MC74HC244ADTEL does not natively accept LSTTL input voltage levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) without pullup resistors on inputs. Its CMOS inputs require VIH ≥ 3.15 V at VCC = 4.5 V. To interface with LSTTL outputs, 4.7 kΩ pullup resistors to VCC are required on all inputs - a design detail explicitly confirmed in the official MC74HC244A datasheet Rev. 9.
What is the 3-state output leakage current specification for the MC74HC244ADTEL at elevated temperature?
The MC74HC244ADTEL specifies a maximum 3-state output leakage current (IOZ) of ±10 µA at VCC = 6.0 V and TA = +125 °C. This value is measured with outputs in high-impedance state, inputs at valid logic levels (VIH or VIL), and outputs biased to VCC or GND - ensuring minimal bus contention in thermally stressed industrial environments.
Can the MC74HC244ADTEL be used as a direct replacement for the 74LS244 in existing designs?
Yes, the MC74HC244ADTEL is pinout-identical to the 74LS244 and functionally compatible when pullup resistors are added to inputs for LSTTL interfacing. Its wider supply range (2–6 V vs. 4.75–5.25 V), lower power consumption, and improved noise immunity make it a validated upgrade path - provided board-level decoupling and input biasing are verified per the MC74HC244ADTEL datasheet guidelines.
What package type is used for the MC74HC244ADTEL part number?
The MC74HC244ADTEL uses the SOIC-Wide-20 package (Case 751D, DW suffix), measuring 7.62 mm wide with 20 leads on 1.27 mm pitch. This package is distinct from narrow SOIC-20 and matches the footprint of legacy 74LS244 DIP-20 when adapted via SOIC-to-DIP adapter boards - a mechanical detail confirmed in the onsemi package drawings for Case 751D.
MC74HC244ADTEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-TSSOP
MC74HC244ADTEL FAQ
1.How can I place an order for MC74HC244ADTEL through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC244ADTEL 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 MC74HC244ADTEL reliable?
The price and inventory of MC74HC244ADTEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC244ADTEL is usually 5 days.
3.What payment methods are accepted for MC74HC244ADTEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC244ADTEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC244ADTEL?
MC74HC244ADTEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC244ADTEL 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 MC74HC244ADTEL?
For technical support, including MC74HC244ADTEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC244ADTEL requirements.
6.How does Aetrix verify that MC74HC244ADTEL is sourced from the original manufacturer or authorized distributors?
All MC74HC244ADTEL 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 MC74HC244ADTEL meets industry standards.
7.What is the process for return or replacement of MC74HC244ADTEL?
All MC74HC244ADTEL units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC244ADTEL, 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 MC74HC244ADTEL part is unused and in its original packaging.
Return procedure for MC74HC244ADTEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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