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Nexperia USA Inc. 74HCT251PW,112
- Part No.:
- 74HCT251PW,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT251PW,112.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,961
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Product details
Overview
74HCT251PW,112 from Nexperia is an 8-input TTL-compatible CMOS multiplexer with complementary outputs (Y and Y), three binary select lines (S0–S2), and active-low 3-state output enable (OE). It operates from 4.5 V to 5.5 V, delivers propagation delays as low as 19 ns (VCC = 5 V, CL = 15 pF), and supports industrial temperature range (−40 °C to +125 °C). It is used in digital logic routing, data selector circuits, and bus interface control in embedded controllers.
For engineers reviewing the 74HCT251PW,112 datasheet, 74HCT251PW,112 pinout, 74HCT251PW,112 application, or 74HCT251PW,112 equivalent, key selection criteria include TTL-level input compatibility, dual complementary outputs, OE-controlled 3-state operation, TSSOP16 packaging for high-density PCBs, and guaranteed performance across extended temperature ranges.
Technical Context
The 74HCT251PW,112 implements a standard 8:1 multiplexer function using static CMOS logic with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V). Its non-inverting data path routes one of eight inputs (I0–I7) to Y based on S0–S2 address bits, while Y provides the logical complement.
Output enable (OE) controls both Y and Y simultaneously: OE = HIGH forces both outputs into high-impedance OFF-state, enabling bus sharing; OE = LOW enables normal multiplexing. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures direct compatibility with 5 V TTL and mixed-voltage systems without level shifting. |
| Propagation Delay (In → Y) | 19 ns typ @ VCC = 5 V, CL = 15 pF - Enables reliable operation in 25 MHz+ digital control paths. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees robust noise margin and seamless interfacing with legacy TTL outputs. |
| Output Drive | ±4 mA @ VCC = 4.5 V - Sufficient to drive 10 LSTTL loads or moderate capacitive loads (<50 pF). |
| Operating Temperature | −40 °C to +125 °C - Qualified for under-hood, industrial motor control, and harsh-environment embedded applications. |
| Power Dissipation | CPD = 46 pF - Predictable dynamic power consumption for thermal budgeting in dense logic layouts. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - Reduces handling sensitivity and improves board-level reliability during assembly. |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1); 16-pin, 4.4 mm body width, 0.65 mm pitch; RoHS-compliant, lead-free termination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 12, 13, 14, 15 | Data Inputs (I0–I7) | Eight parallel digital inputs; I0 = Pin 1, I1 = Pin 2, ..., I7 = Pin 12 per functional diagram and pin description table. |
| 5 | True Output (Y) | Non-inverted selected input signal; driven actively or placed in high-Z when OE = HIGH. |
| 6 | Complementary Output (Y) | Inverted version of Y; both outputs switch synchronously and share same 3-state control via OE. |
| 7 | Output Enable (OE) | Active-low enable; HIGH disables both outputs (high-Z), LOW enables multiplexing function. |
| 8 | GND | Ground reference for all internal circuitry and I/O; must be low-impedance connection. |
| 9, 10, 11 | Select Inputs (S2, S1, S0) | Binary address lines selecting I0–I7; S2 = Pin 9, S1 = Pin 10, S0 = Pin 11 per pin configuration Fig. 5. |
| 16 | VCC | Positive supply rail; decoupling capacitor (100 nF) recommended adjacent to this pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH/VIL thresholds match standard 5 V TTL, eliminating need for external level translators in mixed-logic systems. |
| Dual complementary outputs | Simultaneous true (Y) and inverted (Y) outputs reduce external inverters in differential signaling or latch-based sampling. |
| 3-state output control | Single OE pin disables both Y and Y to high-impedance, enabling direct connection to shared data buses without contention. |
| Wide temperature operation | Specified from −40 °C to +125 °C ensures stable timing and logic integrity in automotive engine control and industrial PLC modules. |
| Low dynamic power | CPD = 46 pF enables predictable power modeling; ICC < 160 μA at +125 °C minimizes quiescent heating in sealed enclosures. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Peripheral Multiplexing |
|---|---|
|
Use Scenario: Routing multiple sensor inputs (temperature, pressure, flow) to a single ADC channel in a programmable logic controller. IC Role / Device Role: 8:1 analog multiplexer front-end with TTL-compatible control from PLC's 5 V microcontroller. Use Value: Reduces component count by replacing discrete analog switches; complementary outputs support differential sampling architectures. |
Use Scenario: Selecting between eight external memory banks or peripheral devices connected to an 8-bit microcontroller data bus. IC Role / Device Role: Digital bus selector enabling time-multiplexed access to multiple peripherals using three address lines and OE for bus arbitration. Use Value: Eliminates need for discrete logic gates or larger CPLDs; 3-state outputs prevent bus contention during idle cycles. |
| Automotive Body Control Module | Test Equipment Signal Routing |
|
Use Scenario: Consolidating diagnostic signals (door lock status, window position, mirror fold feedback) onto a shared CAN subsystem interface. IC Role / Device Role: Digital signal combiner feeding multiplexed status bits to a CAN transceiver controller under MCU supervision. Use Value: −40 °C to +125 °C rating ensures reliability in under-dash environments; HBM > 2000 V withstands ESD events during service operations. |
Use Scenario: Configurable signal path switching in automated test equipment (ATE) for validating multi-channel sensor boards. IC Role / Device Role: Reconfigurable stimulus/data routing node controlled via FPGA GPIO, enabling flexible test pattern sequencing. Use Value: Complementary outputs simplify pass/fail comparison logic; fast 19 ns propagation supports high-throughput test cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT251PWR (TI) | Same TTL-compatible inputs, identical pinout (TSSOP16), but higher ICC (max 200 μA at +125 °C vs. 160 μA). | Valid for drop-in replacement where layout allows; slightly higher quiescent current may impact battery-powered designs. | Prefer when TI supply chain alignment is required; verify thermal derating above 91 °C due to lower Ptot derating slope (7.5 mW/K vs. 8.5 mW/K). |
| 74LVC251PW,118 (Nexperia) | Lower VCC range (1.65–3.6 V), CMOS inputs only (VIH = 0.7×VCC), faster tpd (14 ns @ 3.3 V), no complementary Y output. | Suitable for 3.3 V-only systems; lacks Y output, requiring external inverter for differential use cases. | Select only for 3.3 V domains with strict speed requirements; not interoperable with 5 V TTL control signals. |
Compared with SN74HCT251PWR, the 74HCT251PW,112 offers lower high-temperature supply current and superior thermal derating; compared with 74LVC251PW,118, it retains full 5 V TTL compatibility and dual-output capability essential for legacy system upgrades.
Availability
74HCT251PW,112 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, test equipment signal routing, and microcontroller peripheral expansion requiring stable component supply across extended temperature ranges.
Supply support for 74HCT251PW,112 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 high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT251PW,112 belongs to Nexperia's 74HCT logic family, engineered for seamless integration between TTL and CMOS systems in space-constrained, thermally demanding applications.
FAQ
Can the 74HCT251PW,112 operate at 3.3 V?
No. The 74HCT251PW,112 is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH ≥ 2.0 V) become unreliable, and output drive falls outside guaranteed specifications. For 3.3 V systems, use the pin-compatible 74LVC251PW,118 instead.
What is the maximum capacitive load the Y and Y outputs can drive?
The outputs are characterized up to 50 pF (CL = 50 pF) in dynamic testing. Driving >50 pF increases propagation delay and transition time-e.g., tpd rises from 19 ns to ~53 ns at +125 °C. For >50 pF loads, add series termination or buffer stages to maintain timing integrity.
Is the complementary output (Y) truly inverted, or is it just a buffered copy?
Y is a true logical inversion of Y, generated internally via dedicated CMOS inverter stage-not a separate output buffer. Both outputs switch simultaneously with matched propagation delays (tpd difference < 1 ns), supporting precise differential sampling and noise-canceling receiver interfaces.
Does the OE pin support partial power-down when VCC is applied but OE is held HIGH?
Yes. With OE = HIGH, both Y and Y enter high-impedance state, reducing ICC to ≤160 μA (max at +125 °C). However, internal logic remains powered-inputs continue drawing leakage current (≤1.0 μA per pin), and propagation delay specs do not apply. Full power-down requires removing VCC.
74HCT251PW,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74HCT251PW,112 FAQ
1.How can I place an order for 74HCT251PW,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT251PW,112 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 74HCT251PW,112 reliable?
The price and inventory of 74HCT251PW,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT251PW,112 is usually 5 days.
3.What payment methods are accepted for 74HCT251PW,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT251PW,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT251PW,112?
74HCT251PW,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT251PW,112 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 74HCT251PW,112?
For technical support, including 74HCT251PW,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT251PW,112 requirements.
6.How does Aetrix verify that 74HCT251PW,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT251PW,112 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 74HCT251PW,112 meets industry standards.
7.What is the process for return or replacement of 74HCT251PW,112?
All 74HCT251PW,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT251PW,112, 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 74HCT251PW,112 part is unused and in its original packaging.
Return procedure for 74HCT251PW,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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