SN74LS244DWRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74LS244DWRE4 is an octal buffer and line driver with 3-state outputs in a 20-pin SOIC package. It provides 8 unidirectional non-inverting channels, active-low output-enable control, and a 45 pF load capacitance rating suitable for bus driving. Operating from a 5 V supply, it is designed for data bus buffering, memory interfacing, and address line driving in TTL-compatible digital systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS244DWRE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74LS244DWRE4?
- 8 non-inverting unidirectional buffer/driver channels
- 3-state outputs with active-low OE control for bus sharing
- LS-TTL family with 24 mA output sink current
- 45 pF rated load capacitance for reliable line driving
- 5 V supply compatible with standard TTL logic levels
- 20-pin SOIC wide-body package for automated assembly
What is SN74LS244DWRE4 used for?
The SN74LS244DWRE4 is widely used in data bus buffering applications where multiple devices share an 8-bit bus, such as microprocessor address and data lines in embedded systems. It also serves as an isolation buffer between high-impedance logic outputs and capacitive backplane loads in industrial controllers. Memory expansion boards and legacy TTL-compatible communication interface cards rely on this device to maintain signal integrity across 5 V logic systems.
What are the specifications of SN74LS244DWRE4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | LS |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 45pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.024A |
| 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 Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 50mA |
| Prop. Delay@Nom-Sup | 18ns |
| Propagation Delay (tpd) | 18ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| 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 SN74LS244DWRE4 datasheet?
SN74LS244DWRE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS244DWRE4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many buffer channels does SN74LS244DWRE4 provide, and what is the output current rating?
The SN74LS244DWRE4 has 8 unidirectional non-inverting buffer channels. Each output can sink up to 24 mA, making it suitable for driving bus lines with multiple TTL loads while keeping signal integrity on 5 V backplanes.
Can SN74LS244DWRE4 be used to isolate a microprocessor data bus from a heavily loaded PCB backplane?
Yes. The device's 3-state outputs, enabled by an active-low OE pin, let you gate all 8 outputs simultaneously off the bus. With a 45 pF load capacitance rating, it reliably drives backplane lines at the propagation delays specified in the LS family datasheet for 5 V operation.
What package does SN74LS244DWRE4 use, and how does it differ from the DW suffix?
SN74LS244DWRE4 comes in a 20-pin wide-body SOIC (SO-20W) package on tape-and-reel. The DW designator indicates the 300-mil wide SOIC body, which provides larger pad area than the narrow SO-20, improving solder joint reliability in high-vibration industrial environments.
Which logic family is compatible with SN74LS244DWRE4 inputs and outputs?
The LS-TTL family inputs accept signals from 0 V to 5 V logic systems. Input high threshold is typically 2 V and input low threshold is 0.8 V, ensuring direct compatibility with standard TTL, 74HCT, and 5 V CMOS outputs without level-shifting.
For a legacy memory-expansion board, how does SN74LS244DWRE4 compare to the 74HC244 at 5 V?
At 5 V the 74HC244 offers lower quiescent current and faster propagation time below 10 ns, while SN74LS244DWRE4 delivers the 24 mA sink current and LS-TTL thresholds needed for direct replacement of older boards. If the design has existing LS pull-up resistors and bus termination tuned to LS drive strength, SN74LS244DWRE4 is the drop-in choice.
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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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