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NXP Semiconductors 74LV251DB,112
- Part No.:
- 74LV251DB,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74LV251DB,112.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,296
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Product details
Overview
74LV251DB,112 from NXP Semiconductors (formerly Philips) is a low-voltage 8-input CMOS multiplexer with true/complement 3-State outputs, 1.0–3.6 V supply range, 17–45 ns propagation delay (VCC = 3.0–3.6 V), and pin compatibility with 74HC/HCT251. It routes one of eight data inputs (I0–I7) to dual outputs (Y/Y) under 3-bit binary select control (S0–S2) and enables multiplexer expansion via active-low OE.
For engineers reviewing the 74LV251DB,112 datasheet, 74LV251DB,112 pinout, 74LV251DB,112 application, or 74LV251DB,112 equivalent, this device supports low-voltage digital signal routing in mixed-supply systems, bus isolation, and hierarchical multiplexing where dual complementary outputs and 3-State expansion capability are required.
Technical Context
The 74LV251DB,112 implements a single-pole, 8-throw analog/digital switch function using Si-gate CMOS logic, with independent true (Y) and complement (Y) outputs both controlled by the same select and enable logic. Its 3-State outputs support wired-OR expansion without external logic.
All inputs accept TTL-level signals when VCC ≥ 2.7 V, and its propagation delay scales predictably with supply voltage - e.g., tPLH/tPHL = 17 ns (In→Y) at VCC = 3.3 V, CL = 50 pF - enabling timing-critical routing in 3.3 V systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0 V to 3.6 V - operates across 1.8 V and 3.3 V logic domains without level shifters |
| Propagation Delay (In→Y) | 17 ns typical at VCC = 3.3 V, CL = 50 pF - enables ≤59 MHz multiplexed data throughput |
| Output Drive (IOH/IOL) | ±6 mA at VCC = 3.0 V - drives standard CMOS loads and short PCB traces directly |
| Input Leakage Current | 1.0 µA max at VCC = 3.6 V - negligible loading on upstream drivers or high-impedance sources |
| 3-State Enable/Disable Time | 24 ns typical (OE→Y) at VCC = 3.3 V - supports fast bus arbitration and time-multiplexed resource sharing |
| Input Capacitance | 3.5 pF - minimizes switching noise and reduces drive burden on preceding logic stages |
| Power Dissipation Capacitance | 44 pF per gate - allows accurate dynamic power estimation in clocked applications |
Pinout & Package
74LV251DB,112 is housed in a 16-pin SSOP Type II package (SOT338-1), 5.3 mm body width, with 0.65 mm pitch, suitable for space-constrained PCB layouts requiring moderate I/O density and thermal performance up to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 12, 13, 14, 15 | I0 to I7 | Eight independent data inputs; selected one routed to Y/Y based on S0–S2 state |
| 5 | Y | True output - active HIGH when OE = LOW and corresponding input selected |
| 6 | Y | Complementary output - inverted logic of Y; both outputs simultaneously 3-State when OE = HIGH |
| 7 | OE | Active-low 3-State enable - HIGH disables both outputs (Z-state), enabling parallel multiplexer stacking |
| 8 | GND | Ground reference - must be low-impedance connection to minimize ground bounce (VOLP < 0.8 V typical) |
| 9, 10, 11 | S0, S1, S2 | 3-bit binary select inputs - determine which Ix (x = 0–7) appears at Y/Y |
| 16 | VCC | Positive supply - powers internal logic; supports 1.0–3.6 V operation with full DC/AC specs guaranteed from 1.2 V |
Key Features
| Feature | Design Value |
|---|---|
| True and complement outputs | Simultaneous Y and Y delivery eliminates need for external inverters in differential-sense or parity-check circuits |
| 3-State outputs with common OE | Enables direct wire-OR connection of multiple 74LV251DB,112 devices onto shared buses without contention |
| TTL-input compatibility at VCC ≥ 2.7 V | Interoperates with legacy 5 V TTL outputs without level-shifting circuitry in mixed-voltage systems |
| Low ground bounce (VOLP < 0.8 V) | Reduces noise coupling into adjacent analog or RF sections during high-speed switching |
| Standard output drive (±6 mA) | Directly interfaces with 74LVC, 74ALVC, and other 3.3 V logic families without buffer amplification |
Applications
| Industrial PLC I/O Expansion | Digital Audio Signal Routing |
|---|---|
Use Scenario: A programmable logic controller uses multiple sensor inputs and must dynamically route one of eight analog-to-digital converter outputs to a central processor. IC Role / Device Role / Timing Role: 74LV251DB,112 acts as a digitally controlled analog signal selector, accepting S0–S2 commands from the PLC's microcontroller to choose the active ADC channel. Use Value: Dual Y/Y outputs allow simultaneous feeding of raw and inverted data to differential receivers or fault-detection logic, improving measurement integrity. |
Use Scenario: A multi-channel audio mixer routes one of eight line-level digital audio streams (e.g., SPDIF or I²S data lanes) to a single DAC or serializer. IC Role / Device Role / Timing Role: 74LV251DB,112 serves as a low-jitter, low-propagation-delay digital multiplexer, synchronized to system clock edges to avoid bit errors. Use Value: 17 ns typical propagation delay ensures sub-bit-period latency, preserving audio sample timing accuracy in real-time playback systems. |
| Embedded Test Equipment Channel Selection | Legacy Bus Interface Isolation |
Use Scenario: Automated test equipment selects one of eight DUT (device-under-test) signal lines for probing or stimulus injection using a single high-precision measurement channel. IC Role / Device Role / Timing Role: 74LV251DB,112 functions as a bidirectional signal path selector, leveraging its 3-State outputs to isolate unused channels and prevent loading. Use Value: 3-State disable time of 24 ns enables rapid channel switching between test cycles without signal bleed or settling delays. |
Use Scenario: A modern microcontroller (3.3 V) interfaces with an older peripheral operating at 5 V TTL levels, requiring selective signal gating without voltage translation. IC Role / Device Role / Timing Role: 74LV251DB,112 acts as a level-tolerant bus isolator - its TTL-compatible inputs accept 5 V signals while its 3.3 V outputs remain safe for the MCU. Use Value: Eliminates need for discrete level-shifters or resistive dividers, reducing BOM count and board area in retrofit designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV251ADBR | TI version in 16-pin SSOP (same SOT338-1 footprint); identical AC/DC specs but different ICC max (160 µA vs. 20 µA typical) | Same functional behavior and pinout; higher quiescent current may affect ultra-low-power battery systems | Select SN74LV251ADBR only if TI supply chain preference or qualification requirements apply |
| 74LVC251PW,118 | NXP LVC variant in TSSOP (SOT403-1); wider VCC range (1.2–5.5 V); faster tPLH (14 ns @ 3.3 V) but no true/complement outputs | Lacks Y output - requires external inverter for complement functionality; better for pure single-output routing | Choose 74LVC251PW,118 when higher speed or 5 V tolerance is critical and dual outputs are unnecessary |
Compared with SN74LV251ADBR and 74LVC251PW,118, the 74LV251DB,112 uniquely delivers matched true/complement outputs in a 3-State SSOP package with verified 1.0 V minimum operation - making it optimal for differential sensing, bus expansion, and legacy-compatible low-voltage designs where output symmetry matters.
Availability
74LV251DB,112 is available at Aetrix Electronics and suitable for industrial automation, digital audio infrastructure, embedded test instrumentation, and legacy bus interface applications requiring stable component supply across extended temperature ranges (–40°C to +125°C).
Supply support for 74LV251DB,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
NXP Semiconductors, formerly Philips Semiconductors, is a global leader in high-performance mixed-signal ICs, with expertise in logic, interface, and automotive-grade components.
The 74LV logic family was designed for low-voltage interoperability across 1.8 V and 3.3 V systems while maintaining pin and functional compatibility with industry-standard HC/HCT devices.
FAQ
What is the minimum supply voltage at which 74LV251DB,112 guarantees full functionality?
The 74LV251DB,112 guarantees full DC and AC functionality down to VCC = 1.2 V. While it can operate as low as 1.0 V, specifications such as VIH/VIL thresholds and propagation delay are only guaranteed from 1.2 V onward per the datasheet's recommended operating conditions.
Does 74LV251DB,112 support true 5 V TTL input compatibility?
No - the 74LV251DB,112 accepts TTL input levels only when VCC is between 2.7 V and 3.6 V. At those supplies, VIH = 2.0 V min and VIL = 0.8 V max, matching standard TTL thresholds. It does not tolerate 5 V inputs directly and must not be exposed to voltages exceeding VCC + 0.5 V.
Can both Y and Y outputs of 74LV251DB,112 be used simultaneously in a design?
Yes - Y and Y are true and complement outputs driven simultaneously when OE = LOW and a valid input is selected. Both outputs exhibit identical propagation delay and 3-State behavior, enabling direct connection to differential receivers or XOR-based error detection circuits without additional logic.
What is the thermal rating of the SSOP package used by 74LV251DB,112?
The 74LV251DB,112 in SOT338-1 (SSOP16) is rated for operation from –40°C to +125°C ambient temperature. Its power dissipation derating begins above +60°C at 5.5 mW/K, supporting reliable use in industrial and automotive under-hood environments.
Is 74LV251DB,112 pin-compatible with 74HC251 and 74HCT251?
Yes - the 74LV251DB,112 is explicitly stated in the datasheet as pin and function compatible with 74HC251 and 74HCT251. This includes identical pin numbering, logic function, truth table, and 3-State behavior, allowing drop-in replacement in existing 5 V designs when operated within its 3.3 V supply range.
74LV251DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LV
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 1 x 8:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 6mA, 6mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74LV251DB,112 FAQ
1.How can I place an order for 74LV251DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LV251DB,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 74LV251DB,112 reliable?
The price and inventory of 74LV251DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LV251DB,112 is usually 5 days.
3.What payment methods are accepted for 74LV251DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LV251DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LV251DB,112?
74LV251DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LV251DB,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 74LV251DB,112?
For technical support, including 74LV251DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LV251DB,112 requirements.
6.How does Aetrix verify that 74LV251DB,112 is sourced from the original manufacturer or authorized distributors?
All 74LV251DB,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 74LV251DB,112 meets industry standards.
7.What is the process for return or replacement of 74LV251DB,112?
All 74LV251DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LV251DB,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 74LV251DB,112 part is unused and in its original packaging.
Return procedure for 74LV251DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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