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onsemi MC74HC244ADT
- Part No.:
- MC74HC244ADT
- Manufacturer:
- onsemi
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74HC244ADT.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,817
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Product details
Overview
MC74HC244ADT 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 15 LSTTL load drive capability, dual active-low output enables (Enable A and Enable B), and propagation delay as low as 15 ns at 6.0 V - used for bus-oriented memory address and clock driving in industrial control and instrumentation systems.
For engineers reviewing the MC74HC244ADT datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage range compatibility (2.0–6.0 V), 3-state output timing (tPLH/tPHL ≤ 15 ns @ 6 V), dual independent enable control, and AEC-Q100 qualification status indicated by the −Q suffix in related variants.
Technical Context
The MC74HC244ADT implements two independent 4-bit noninverting buffer groups (A1–A4 → YA1–YA4; B1–B4 → YB1–YB4), each controlled by a dedicated active-low output enable (Enable A on Pin 1, Enable B on Pin 19). Inputs are CMOS-compatible and tolerate LSTTL levels with pullup resistors.
It supports full 3-state bus interface operation: outputs enter high-impedance state when either enable is high; only enabled group drives its outputs. Propagation delays are symmetric for both input-to-output (tPLH/tPHL) and enable-to-output (tPLZ/tPHZ) transitions, enabling precise timing control in bidirectional data routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports wide-input-voltage logic interfacing across mixed-supply systems. |
| Propagation Delay (A→YA) | 15 ns max @ VCC = 6.0 V - enables high-speed bus buffering up to ~33 MHz clock domains. |
| Output Drive | 15 LSTTL loads - sufficient to drive standard TTL fanout without external buffers. |
| Input Leakage Current | ±1.0 µA max @ 125°C - ensures stable logic thresholds under temperature stress. |
| 3-State Leakage | ±10 µA max @ 125°C - maintains bus integrity during high-impedance hold. |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and automotive under-hood environments. |
| Input Capacitance | 10 pF max - minimizes capacitive loading on upstream drivers and preserves signal edge rate. |
Pinout & Package
TSSOP-20 (Case 948E), 0.65 mm pitch, 6.5 mm × 4.4 mm body, 1.2 mm max height, Pb-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | Enable A / Enable B | Active-low controls for Group A (YA1–YA4) and Group B (YB1–YB4); independent gating enables selective bus segment activation. |
| 2, 4, 6, 8 | A1–A4 Inputs | Noninverting data inputs for first buffer group; compatible with CMOS and LSTTL (with pullups). |
| 11, 13, 15, 17 | B1–B4 Inputs | Noninverting data inputs for second buffer group; electrically isolated from Group A. |
| 18, 16, 14, 12 | YA1–YA4 Outputs | 3-state noninverting outputs for Group A; high-impedance when Enable A = high. |
| 9, 7, 5, 3 | YB1–YB4 Outputs | 3-state noninverting outputs for Group B; high-impedance when Enable B = high. |
| 10 | GND | Ground reference for all I/O and internal logic; must be low-impedance connection. |
| 20 | VCC | Positive supply rail; decoupling capacitor required within 1 cm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 3-state control | Enables concurrent management of two separate 4-bit data paths on shared bus infrastructure without contention. |
| CMOS/TTL input compatibility | Accepts both CMOS-level signals and LSTTL outputs (with pullup resistors), simplifying legacy system integration. |
| Low quiescent current | ICC ≤ 160 µA max @ 125°C - reduces static power in always-on subsystems. |
| High noise immunity | Guaranteed VIH/VIL margins (e.g., VIH ≥ 3.15 V @ VCC = 4.5 V) suppress false triggering in noisy industrial environments. |
| AEC-Q100 qualified variant available | MC74HC244ADTR2G−Q* meets automotive stress testing requirements - suitable for infotainment and body control modules. |
Applications
| Industrial PLC Backplane Interface | Automotive Instrument Cluster Data Routing |
|---|---|
Use Scenario: Isolating and buffering address/data lines between microcontroller and multiple peripheral ICs on a dense PCB backplane. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing direction-controlled signal isolation and fanout expansion. Use Value: Dual enable pins allow time-multiplexed access to two peripheral banks while maintaining bus integrity via high-impedance hold. | Use Scenario: Routing sensor data and display commands between MCU and segmented LCD driver and CAN transceiver in instrument cluster. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface with independent control over analog sensor and digital display signal paths. Use Value: 2.0–6.0 V operation matches varied supply rails (3.3 V MCU, 5 V display), and 125°C rating supports under-dash thermal environment. |
| Test Equipment Signal Conditioning | Medical Diagnostic Device Bus Management |
Use Scenario: Driving calibrated analog multiplexer select lines and digital trigger signals in automated test equipment with strict timing jitter limits. IC Role / Device Role / Timing Role: Low-skew, low-capacitance buffer ensuring synchronized switching across 8 parallel control lines. Use Value: 10 pF input capacitance and 15 ns propagation delay minimize inter-channel skew and preserve setup/hold timing margins. | Use Scenario: Managing communication between FPGA, ADCs, and isolated UART interfaces in portable diagnostic devices requiring EMI resilience. IC Role / Device Role / Timing Role: Noise-immune bus driver isolating sensitive analog acquisition circuitry from digital control logic. Use Value: High noise immunity (JEDEC Std. 7A compliant) and ±10 µA 3-state leakage prevent signal corruption during idle periods. |
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 |
|---|---|---|---|
| SN74HC244PWR | TSSOP-20, identical pinout and electrical specs; TI part with different thermal resistance (150°C/W vs. onsemi's 150°C/W) and slightly higher ICC (200 µA max). | Same industrial temperature range but lacks −Q automotive qualification path; not PPAP-capable. | Select when sourcing from TI-authorized channels or when cross-manufacturer BOM redundancy is required. |
| 74VHC244M | SOIC-20 only; faster propagation (10 ns @ 5 V), lower drive (8 LSTTL loads), narrower VCC range (2.0–5.5 V). | Not pin-compatible with TSSOP-20 layout; requires PCB redesign; better suited for space-constrained 5 V-only systems. | Select only if board layout allows SOIC-20 footprint and speed >15 ns is critical; verify thermal derating for 125°C operation. |
Compared with SN74HC244PWR and 74VHC244M, the MC74HC244ADT offers AEC-Q100 qualification support via −Q variants, identical TSSOP-20 mechanical fit, and guaranteed 15 LSTTL load drive across full temperature range - making it optimal for automotive-adjacent industrial designs requiring long-term supply continuity and stress-tested reliability.
Availability
MC74HC244ADT is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive instrument clusters, test equipment signal conditioning, and medical diagnostic device bus management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC74HC244ADT 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, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The MC74HC244ADT belongs to the 74HC logic family, designed for high-speed, low-power CMOS interfacing in noise-sensitive and thermally demanding applications where robust 3-state bus control is essential.
FAQ
What is the maximum operating temperature for the MC74HC244ADT?
The MC74HC244ADT is rated for operation from –55°C to +125°C. This extended temperature range is validated per JEDEC standards and supports deployment in harsh environments such as industrial control cabinets and automotive under-hood locations. The MC74HC244ADT maintains full DC and AC specifications across this range, including guaranteed propagation delay and 3-state leakage performance.
Does the MC74HC244ADT support TTL-level inputs directly?
The MC74HC244ADT does not natively accept TTL-level inputs without external biasing. Its inputs are CMOS-compatible (VIH ≥ 3.15 V @ VCC = 4.5 V), but with pullup resistors to VCC, they become compatible with LSTTL outputs. For direct TTL interface, the pin-compatible MC74HCT244ADT variant should be used, which specifies VIH = 2.0 V and VIL = 0.8 V at 5 V.
What is the function of Pins 1 and 19 on the MC74HC244ADT?
Pins 1 and 19 are active-low output enables: Enable A (Pin 1) controls YA1–YA4, and Enable B (Pin 19) controls YB1–YB4. When either pin is low, its corresponding group drives noninverted outputs; when high, those outputs enter high-impedance state. This dual-enable architecture allows independent control of two 4-bit data paths on a shared bus, preventing contention in MC74HC244ADT-based systems.
Is the MC74HC244ADT RoHS compliant and lead-free?
Yes, the MC74HC244ADT is RoHS compliant and Pb-free, as confirmed by onsemi's marking diagram (suffix "G") and packaging documentation. It meets EU Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The TSSOP-20 package uses matte tin lead finish and complies with J-STD-020 moisture sensitivity level 1.
Can the MC74HC244ADT be used as a level shifter between 3.3 V and 5 V logic domains?
Yes, the MC74HC244ADT can perform unidirectional level shifting: when powered at 5 V, it accepts 3.3 V CMOS inputs (VIH min = 3.15 V @ VCC = 4.5 V) and outputs 5 V logic levels. However, it does not support bidirectional translation or 5 V-tolerant inputs at 3.3 V supply - for that, a dedicated level translator like the TXB0108 is required. The MC74HC244ADT is optimized for single-supply bus driving, not true bidirectional voltage translation.
MC74HC244ADT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
MC74HC244ADT FAQ
1.How can I place an order for MC74HC244ADT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74HC244ADT 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 MC74HC244ADT reliable?
The price and inventory of MC74HC244ADT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74HC244ADT is usually 5 days.
3.What payment methods are accepted for MC74HC244ADT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74HC244ADT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74HC244ADT?
MC74HC244ADT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74HC244ADT 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 MC74HC244ADT?
For technical support, including MC74HC244ADT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74HC244ADT requirements.
6.How does Aetrix verify that MC74HC244ADT is sourced from the original manufacturer or authorized distributors?
All MC74HC244ADT 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 MC74HC244ADT meets industry standards.
7.What is the process for return or replacement of MC74HC244ADT?
All MC74HC244ADT units undergo pre-shipment inspection (PSI). If there is an issue with MC74HC244ADT, 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 MC74HC244ADT part is unused and in its original packaging.
Return procedure for MC74HC244ADT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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