SN74HC244ADBR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74HC244ADBR is an 8-channel unidirectional bus buffer and line driver with 3-state outputs in a 20-SSOP package, operating from 2 V to 6 V across -40 to 85°C. It features active-low enable control and 150 pF load capacitance rating for robust bus driving. Available with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC244ADBR Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74HC244ADBR?
- 8-channel unidirectional buffer with 3-state outputs and active-low enable for controlled bus isolation in CMOS digital systems
- Wide 2 V to 6 V supply range supporting both 3.3 V and 5 V logic families in mixed-voltage digital designs
- 20-SSOP compact surface-mount package rated for -40 to 85°C industrial temperature range with 150 pF load drive capability
What is SN74HC244ADBR used for?
The SN74HC244ADBR is used as a bus buffer and line driver in microprocessor address and data bus expansion, where 3-state outputs allow multiple drivers to share a common bus without contention. Its 2 V to 6 V supply range enables use in both 3.3 V and 5 V CMOS logic systems including FPGA I/O expansion, memory interface buffering, and LCD or peripheral bus driving. The 20-SSOP package suits compact digital control boards operating in -40 to 85°C industrial environments.
What are the specifications of SN74HC244ADBR?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | HC |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 150pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.0078A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 210ns |
| Propagation Delay (tpd) | 210ns |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.01 |
Where can I find the SN74HC244ADBR datasheet?
SN74HC244ADBR Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74HC244ADBR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does the 3-state output feature of the SN74HC244ADBR enable multi-driver bus sharing in microprocessor systems?
The SN74HC244ADBR's 3-state outputs allow the device to disconnect all 8 output channels from the bus when the active-low enable pin is deasserted, preventing bus contention when multiple drivers share the same data or address lines. This is essential in 8-bit microprocessor systems where memory, peripherals, and DMA controllers must arbitrate bus ownership across a shared 8-wire bus.
Can the SN74HC244ADBR interface between 3.3 V and 5 V logic families in a mixed-voltage digital design?
The SN74HC244ADBR operates across a 2 V to 6 V supply range, which allows it to be powered at 3.3 V or 5 V, but it does not perform level shifting between different voltage domains — the input and output logic thresholds are referenced to the same VCC. For 3.3 V to 5 V translation, a dedicated level shifter is required; however, within a single 3.3 V or 5 V domain it drives 8 channels with up to 150 pF load per output.
For an industrial control board operating at -40°C, how does the SN74HC244ADBR's temperature rating affect bus reliability?
The SN74HC244ADBR is rated across -40 to 85°C industrial temperature range, ensuring all 8 buffer channels maintain guaranteed HC-family logic levels and 150 pF drive capability even at cold startup. In industrial PLCs and panel controllers that power up in freezing environments, this temperature rating eliminates the output-low current degradation seen in commercial-grade logic ICs below 0°C.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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