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NXP Semiconductors 74HC251N,652
- Part No.:
- 74HC251N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC251N,652.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,182
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Product details
Overview
74HC251N,652 from Nexperia is an 8-input CMOS multiplexer with three select lines (S0–S2), active-low output enable (OE), complementary outputs (Y and Y̅), and wide supply range (2.0 V to 6.0 V). It routes one of eight binary inputs to the outputs under digital control and supports high-impedance tri-state operation for bus sharing in digital logic systems.
For engineers reviewing the 74HC251N,652 datasheet, 74HC251N,652 pinout, 74HC251N,652 application, or 74HC251N,652 equivalent, this device serves as a core signal routing component in data acquisition, address decoding, and programmable logic interfaces where low-power, noise-immune, and temperature-stable 3-state multiplexing is required.
Technical Context
The 74HC251N,652 implements a non-inverting 8:1 multiplexer function using standard CMOS logic architecture. Its select inputs decode a 3-bit binary address to activate exactly one of eight data paths, while OE independently controls output driver enablement without affecting internal logic state.
Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The device operates across -40 °C to +125 °C and complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V) standards, supporting both industrial and extended-temperature embedded applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.0 V to 6.0 V - enables direct interface with 3.3 V and 5 V logic families without level translation. |
| Propagation delay (In→Y) | 14 ns (typ.) at VCC = 6.0 V, CL = 50 pF - ensures sub-70-MHz switching capability in synchronous data paths. |
| Enable/disable time (OE→Y) | 10 ns enable / 11 ns disable (typ.) at VCC = 6.0 V - supports fast bus arbitration and dynamic output control. |
| Output drive strength | ±25 mA - sufficient to drive multiple TTL/CMOS loads or moderate PCB traces without buffering. |
| Input leakage current | ±0.1 μA max at 25 °C - minimizes static power draw and prevents unintended logic transitions in high-impedance nodes. |
| Operating temperature | -40 °C to +125 °C - qualified for under-hood, industrial control, and power-conversion environments. |
| Power dissipation capacitance | 44 pF - enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal design. |
Pinout & Package
74HC251N,652 is supplied in the SOT38-4 (DIP-16) package - a 16-pin plastic dual in-line package with 0.3-inch body width and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard DIP convention (counter-clockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 12, 13, 14, 15 | Data inputs I0–I7 | Eight independent digital input channels selected via S0–S2; accept CMOS-level signals across full VCC range. |
| 5 | Output Y | True (non-inverted) multiplexer output; driven to HIGH/LOW or high-impedance based on OE and select state. |
| 6 | Output Y̅ | Complementary (inverted) multiplexer output; provides differential signaling capability or logic inversion without external gate. |
| 7 | OE (active LOW) | Tri-state control input: LOW enables outputs; HIGH forces Y/Y̅ into high-impedance OFF-state for bus isolation. |
| 8 | GND | Ground reference for all internal circuitry and I/O; must be connected to system 0 V plane with low-impedance path. |
| 9, 10, 11 | Select inputs S2, S1, S0 | 3-bit binary address determining which Ix input appears at Y/Y̅; S2 = MSB, S0 = LSB per standard truth table. |
| 16 | VCC | Positive supply rail; powers internal logic and output drivers; requires local 100 nF decoupling near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply voltage range | 2.0 V to 6.0 V operation eliminates need for separate voltage rails when interfacing mixed-voltage subsystems. |
| High noise immunity | Guaranteed 40% VCC noise margin at VCC = 4.5 V - suppresses false triggering in electrically noisy industrial environments. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events. |
| ESD protection | HBM > 2000 V and CDM > 1000 V - reduces handling sensitivity and improves board-level robustness without external protection. |
| Input clamp diodes | Enable safe connection to voltages up to VCC + 0.5 V using series current-limiting resistors - simplifies level-shifting in mixed-supply designs. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address/Data Bus Multiplexing |
|---|---|
|
Use Scenario: Expanding discrete input count on a programmable logic controller by scanning multiple sensor inputs through a single microcontroller port. IC Role / Device Role / Timing Role: 8:1 multiplexer selecting one of eight field sensors (e.g., limit switches, proximity detectors) for sequential ADC sampling. Use Value: Reduces GPIO usage by 7 pins versus individual connections while maintaining deterministic scan timing (≤51 ns propagation delay). |
Use Scenario: Sharing limited MCU address/data lines between memory, peripherals, and configuration registers in space-constrained embedded controllers. IC Role / Device Role / Timing Role: Bidirectional bus selector enabling time-multiplexed access to multiple memory-mapped devices using OE-controlled tristate outputs. Use Value: Enables compact 8-bit bus architecture without glue logic; 3-state outputs prevent contention during bus handoff. |
| Digital Test Equipment Signal Routing | Programmable Logic Interface Module |
|
Use Scenario: Configurable signal path selection in automated test equipment to route calibration references or stimulus signals to DUT channels. IC Role / Device Role / Timing Role: Precision analog/digital signal switch controlled by FPGA-generated S0–S2 and OE, leveraging complementary Y/Y̅ outputs for differential test modes. Use Value: Delivers <19 ns output transition time (tt) and <0.4 V VOL at 4 mA - preserves signal integrity for 10-MHz+ test waveforms. |
Use Scenario: Building modular logic blocks in education kits or rapid-prototyping platforms where users configure combinational functions via jumper or software. IC Role / Device Role / Timing Role: Core routing element in breadboard-friendly DIP-16 format, allowing students to implement custom selectors, data concentrators, or function generators. Use Value: Through-hole SOT38-4 package supports manual soldering and socket-based reconfiguration; CMOS inputs simplify TTL/CMOS interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC251D,118 | SO16 surface-mount package (SOT109-1); identical electrical specs and pinout mapping. | Suitable for automated PCB assembly; requires reflow-compatible layout and lacks through-hole mechanical retention. | Select when board space is constrained and volume production justifies SMT process investment. |
| SN74LS251N | Bipolar TTL technology; 4.75–5.25 V only; higher ICC (30 mA typ.), slower propagation (25 ns min), no high-impedance Y̅ output. | Compatible only with legacy 5 V TTL systems; not interoperable with 3.3 V or mixed-voltage designs. | Choose only for drop-in replacement in existing LS-based designs where power and speed margins permit. |
Compared with 74HC251D,118, the 74HC251N,652 offers mechanical robustness and hand-soldering flexibility but requires larger PCB footprint; versus SN74LS251N, it delivers lower power, wider voltage support, and true complementary outputs - making it superior for modern low-voltage and mixed-signal applications.
Availability
74HC251N,652 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, educational hardware development, and embedded control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 74HC251N,652 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
Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable, and scalable logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HC251N,652 belongs to Nexperia's 74HC high-speed CMOS logic family, engineered for low-power, noise-immune digital signal routing in resource-constrained and thermally demanding applications.
FAQ
What is the maximum supply voltage rating for the 74HC251N,652?
The absolute maximum supply voltage (VCC) for the 74HC251N,652 is +7.0 V, but the recommended operating range is 2.0 V to 6.0 V. Operation above 6.0 V risks violating the Absolute Maximum Ratings and may cause permanent damage or parametric shift. For reliable long-term use, maintain VCC within the specified 2.0–6.0 V window per the datasheet's Recommended Operating Conditions table.
Does the 74HC251N,652 support TTL-level inputs?
No, the 74HC251N,652 is a CMOS device with CMOS-level input thresholds (VIH ≥ 3.15 V at VCC = 4.5 V). It does not guarantee proper recognition of standard TTL logic levels (2.0 V HIGH threshold). For TTL-compatible operation, use the pin-compatible 74HCT251N variant instead, which specifies VIH = 2.0 V min at VCC = 4.5–5.5 V.
What is the function of the Y̅ (pin 6) output on the 74HC251N,652?
The Y̅ output on the 74HC251N,652 is the logical complement of the Y output (pin 5). When a selected input (e.g., I3) is routed to Y, Y̅ simultaneously presents the inverted value. This enables direct implementation of differential signaling, XOR/XNOR logic, or active-low bus driving without external inverters - reducing component count and propagation delay in critical paths.
Can the 74HC251N,652 operate at -40 °C ambient temperature?
Yes, the 74HC251N,652 is fully specified and qualified for operation from -40 °C to +125 °C. All key parameters - including propagation delay, VOL, VOH, and ICC - are guaranteed across this extended industrial temperature range, making it suitable for outdoor, automotive under-hood, and industrial control applications where thermal extremes occur.
Is the 74HC251N,652 pin-compatible with the 74LS251?
No, the 74HC251N,652 is not pin-compatible with the 74LS251. While both are 8-input multiplexers with complementary outputs, the 74LS251 uses a different pin assignment: its Y̅ output is on pin 7 (not pin 6), OE is on pin 13 (not pin 7), and select inputs occupy pins 1–3 (not 9–11). Direct substitution would require PCB redesign or adapter wiring.
74HC251N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
74HC251N,652 FAQ
1.How can I place an order for 74HC251N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC251N,652 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 74HC251N,652 reliable?
The price and inventory of 74HC251N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC251N,652 is usually 5 days.
3.What payment methods are accepted for 74HC251N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC251N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC251N,652?
74HC251N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC251N,652 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 74HC251N,652?
For technical support, including 74HC251N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC251N,652 requirements.
6.How does Aetrix verify that 74HC251N,652 is sourced from the original manufacturer or authorized distributors?
All 74HC251N,652 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 74HC251N,652 meets industry standards.
7.What is the process for return or replacement of 74HC251N,652?
All 74HC251N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC251N,652, 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 74HC251N,652 part is unused and in its original packaging.
Return procedure for 74HC251N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC251N,652 Tags
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SN74HC138DR
Texas Instruments
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TC7SB3157CFU,LF(CT
Toshiba Semiconductor and Storage
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74CBTLV3257PW,118
Nexperia USA Inc.
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74CBTLV3257GUX
Nexperia USA Inc.
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74HC154BQ,118
Nexperia USA Inc.
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P3S0200GMX
NXP USA Inc.
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SN74CB3Q3245PWR
Texas Instruments
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SN74CB3Q3257RGYR
Texas Instruments
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TCA9543APWR
Texas Instruments
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TCA9546APWR
Texas Instruments
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SN74HC138N
Texas Instruments
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