SN74LS257BDIn StockTexas Instruments
SN74LS257BD is a quadruple 2-to-1 data selector/multiplexer IC with 3-state outputs, featuring 4 independent channels and 2-bit selection. Supports 45 pF load capacitance and 24 mA output sink current. From $0.27, in stock worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS257BD Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2663(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Quadruple 2-to-1 multiplexer with 3-state outputs for bus-oriented applications
- 4 independent channels with 2-bit input selection per channel
- 24 mA output sink current (I_OL) for driving standard TTL loads
- 45 pF load capacitance support for reliable signal integrity
- LS-family logic compatible with low power Schottky technology
Applications
The SN74LS257BD is widely used in data routing and bus multiplexing applications within digital systems, including microprocessor address/data bus selection and memory bank switching. Its 3-state outputs make it ideal for shared bus architectures in industrial controllers and embedded systems. The device also finds use in data selector circuits for test equipment and communication interfaces requiring reliable multi-channel signal switching.
Specifications
| YTEOL | 0 |
| Family | LS |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 45pF |
| Logic IC Type | MULTIPLEXER |
| Max I(ol) | 0.024A |
| Number of Bits | 2 |
| Number of Functions | 4 |
| Number of Inputs | 2 |
| Number of Outputs | 1 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 18mA |
| Prop. Delay@Nom-Sup | 21ns |
| Propagation Delay (tpd) | 24ns |
| 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 (Ni/Pd/Au) |
| 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 | 8542.39.00.60 |
| Country of Origin | Mexico |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the SN74LS257BD and what does it do?
The SN74LS257BD is a quadruple 2-line to 1-line data selector/multiplexer IC with 3-state outputs from Texas Instruments. It contains four independent 2-to-1 multiplexer channels, allowing selection between two data inputs per channel based on a common select input. The 3-state outputs enable the device to be connected directly to shared bus lines without bus contention.
What are the key electrical specifications of the SN74LS257BD?
The SN74LS257BD features a maximum output sink current (I_OL) of 24 mA, a load capacitance (CL) of 45 pF, and operates with LS-family TTL logic levels. It is housed in a 16-pin Small Outline Package (R-PDSO-G16), supports 2-bit selection, and includes 4 multiplexer functions in a single device. The JESD-609 code is e4, indicating RoHS-compliant (lead-free) versions are available.
What are typical applications for the SN74LS257BD?
The SN74LS257BD is commonly used in microprocessor bus systems for address and data multiplexing, memory bank selection, and shared bus architectures. Its 3-state outputs make it suitable for backplane bus drivers and multi-master bus environments. It is also used in industrial controllers, embedded systems, and communication interfaces where multi-channel signal routing is required.
Are there compatible alternatives or replacements for the SN74LS257BD?
Compatible alternatives include the SN74HC257 (CMOS version for lower power consumption), SN74HCT257 (CMOS with TTL-compatible inputs), and the SN74LS257B in other package variants. The SN74ALS257 offers improved speed and lower power compared to the LS version. When substituting, verify supply voltage range, output drive capability (I_OL), and propagation delay to ensure compatibility with your circuit.
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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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