SN74HC251D Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74HC251D is a high-speed CMOS single 8-to-1 multiplexer from Texas Instruments, featuring 8-bit data selection with three-state outputs, 7.8 mA output low current, and a 150 pF load capacitance in a 16-pin SOIC package. It belongs to the HC/UH logic family and is fully RoHS compliant. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74HC251D 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
Key Features
- Single 8-to-1 multiplexer with three-state outputs enabling efficient 8-channel data selection and bus sharing in digital systems
- 7.8 mA output low current (I(ol)) providing strong drive capability for bus-connected logic in embedded and industrial applications
- HC/UH CMOS family operation with 150 pF load capacitance, ensuring reliable switching performance in standard logic designs
- 16-pin SOIC package (R-PDSO-G16) offering compact surface-mount footprint for space-efficient PCB designs
Applications
The SN74HC251D is widely used in data routing and bus multiplexing applications, allowing a single 8-bit source to be selected from eight independent input channels in microprocessor and FPGA systems. It is ideal for memory address selection, data acquisition circuits, and signal switching in industrial controllers and communication hardware. Its three-state output capability makes it well suited for shared-bus architectures where multiple devices drive a common data line.
Specifications
| YTEOL | 0 |
| Family | HC/UH |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 150pF |
| Logic IC Type | MULTIPLEXER |
| Max I(ol) | 0.0078A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Inputs | 8 |
| Number of Outputs | 1 |
| Output Characteristics | 3-STATE |
| Output Polarity | COMPLEMENTARY |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 75ns |
| Propagation Delay (tpd) | 375ns |
| Qualification Status | Not Qualified |
| 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 (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 | 8542.39.00.01 |
| Country of Origin | Mexico |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74HC251D:
Multiplexer, HC/UH Series, 1-Func, 8 Line Input, 1 Line Output, Complementary Output, CMOS, PDSO16
Frequently Asked Questions
What is the channel configuration of the SN74HC251D multiplexer?
The SN74HC251D is a single 8-to-1 multiplexer with 8 data inputs and 3 select lines, enabling selection of one of eight input channels to the output. It also features three-state outputs for bus-sharing applications in digital logic systems.
What is the output drive current specification for the SN74HC251D?
The SN74HC251D has a maximum output low current (I(ol)) of 7.8 mA, providing adequate drive strength for driving bus lines and other logic loads. The load capacitance rating is 150 pF, consistent with standard HC CMOS family performance.
What package does the SN74HC251D use and is it RoHS compliant?
The SN74HC251D is housed in a 16-pin SOIC package (JESD-30 code R-PDSO-G16). It is RoHS compliant with JESD-609 code e4 (Pb-free), meeting modern environmental requirements for lead-free surface-mount assembly in consumer and industrial electronics.
What are typical applications for the SN74HC251D?
Common applications include data multiplexing in microprocessor systems, memory bank selection, analog or digital signal routing, address decoding, and any design requiring selection among eight data sources. Its three-state output is particularly valuable in shared-bus and multi-master digital architectures.
What are functional alternatives or pin-compatible replacements for the SN74HC251D?
Functional alternatives include the CD74HC251 series and SN74HCT251D for TTL-level input compatibility. The SN74LS251 offers a lower-speed TTL option. Always confirm pinout, logic family compatibility, and voltage range when selecting a replacement for the SN74HC251D.
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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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