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NXP Semiconductors 74LV251N,112
- Part No.:
- 74LV251N,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74LV251N,112.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,736
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Product details
Overview
74LV251N,112 from NXP Semiconductors (formerly Philips) is a low-voltage 8-input CMOS multiplexer with true/complement 3-State outputs, pin- and function-compatible with 74HC/HCT251. It operates from 1.0 V to 3.6 V, delivers propagation delays as low as 17 ns (VCC = 3.3 V), supports TTL-level inputs at VCC ≥ 2.7 V, and enables cascaded multiplexer expansion via dual high-impedance outputs - used in address/data routing in legacy industrial controllers and FPGA I/O expansion interfaces.
For engineers reviewing the 74LV251N,112 datasheet, 74LV251N,112 pinout, 74LV251N,112 application, or 74LV251N,112 equivalent, key selection criteria include supply voltage range (1.0–3.6 V), dual 3-State output capability for bus sharing, propagation delay vs. VCC dependency, input compatibility with TTL logic, and DIP-16 package mechanical fit in through-hole PCB designs.
Technical Context
The 74LV251N,112 implements an 8:1 data selector using Si-gate CMOS technology with three binary select lines (S0–S2) and an active-low output enable (OE). Its dual outputs (Y and Y) are simultaneously driven in complementary logic states when enabled, and both enter high-impedance (Z) state when OE is HIGH - enabling parallel connection of multiple devices on shared buses without external gating.
It features optimized low-voltage DC characteristics: VIH min = 0.9 V at VCC = 1.2 V, VOL max = 0.4 V at VCC = 3.0 V/IO = 6 mA, and ICC quiescent current ≤ 20 µA at VCC = 3.6 V. AC performance is specified across –40°C to +125°C with CL = 50 pF, supporting reliable timing in extended-temperature industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0 V to 3.6 V - supports battery-powered and mixed-voltage systems; functional down to 1.0 V with guaranteed DC specs from 1.2 V |
| Propagation Delay (In→Y) | 17 ns typical at VCC = 3.3 V, CL = 50 pF - enables sub-60-MHz data routing in synchronous control paths |
| Output Drive (Standard) | ±6 mA at VCC = 3.0 V - sufficient to drive 50-pF loads and standard CMOS/TTL fan-out without buffers |
| Input Voltage Compatibility | TTL-level inputs accepted at VCC = 2.7–3.6 V - allows direct interfacing with legacy 5 V logic without level shifters |
| 3-State Enable Timing | tPZH/tPLZ = 24 ns max at VCC = 3.3 V - ensures clean bus arbitration during multiplexer chaining |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules and industrial motor drives |
| Power Dissipation Capacitance | CPD = 44 pF at VCC = 3.3 V - enables accurate dynamic power estimation (PD = CPD × VCC² × fi) |
Pinout & Package
74LV251N,112 is supplied in a 16-pin plastic DIP (Dual In-line Package), SOT38-4 footprint, with 300-mil lead spacing and through-hole mounting. Package meets JEDEC MS-001 and is RoHS-compliant per NXP's 1998 specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 12, 13, 14, 15 (I0–I7) | Multiplexer data inputs | Eight independent digital inputs; selected one routed to Y/Y based on S0–S2 code |
| 5 (Y) | True output | Active-high logic copy of selected input; 3-State when OE = HIGH |
| 6 (Y) | Complement output | Inverted copy of selected input; identical 3-State behavior as Y |
| 7 (OE) | Output enable (active LOW) | Drives both Y and Y into high-Z when HIGH; enables bus sharing in multi-device configurations |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and I/O; must be low-impedance for noise immunity |
| 9, 10, 11 (S0–S2) | Select address inputs | 3-bit binary code (LSB→MSB) determining which Ix feeds Y/Y; latched on rising edge of enable |
| 16 (VCC) | Positive supply | Primary power rail; decoupling capacitor (100 nF) required within 10 mm for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation (1.0–3.6 V) | Enables direct integration into 1.2 V, 1.8 V, 2.5 V, and 3.3 V systems without level translation |
| Dual 3-State outputs (Y and Y) | Allows stacking multiple 74LV251N,112 devices on same data bus for scalable channel expansion |
| TTL input level compatibility | Accepts standard 5 V TTL thresholds at VCC ≥ 2.7 V - simplifies migration from 74LS/74ALS designs |
| Ground bounce < 0.8 V (VCC = 3.3 V) | Reduces noise coupling into adjacent analog or clock circuits during high-speed switching |
| VOH undershoot > 2 V (VCC = 3.3 V) | Maintains noise margin above 2.0 V during fast transitions - critical for robust signal integrity |
Applications
| Industrial PLC I/O Expansion | FPGA Configuration Bus Multiplexing |
|---|---|
Use Scenario: Routing discrete sensor inputs (limit switches, encoders) to a central microcontroller in modular PLC backplanes. IC Role / Device Role / Timing Role: 8:1 data selector that consolidates 8 field inputs onto a shared 8-bit data bus under microcontroller address control. Use Value: Eliminates need for discrete logic gates or larger CPLDs; leverages existing 3-State bus architecture with no additional buffering. |
Use Scenario: Selecting between multiple configuration bitstreams (e.g., different FPGA firmware images) during boot-up. IC Role / Device Role / Timing Role: Address-controlled multiplexer feeding configuration data from parallel Flash memory banks into FPGA CONFIG_DATA pins. Use Value: Enables field-upgradable FPGA functionality without re-spinning PCB; uses standard 3-State bus hold-off during image switch. |
| Legacy Microprocessor Address Decoding | Automotive Body Control Module Signal Routing |
Use Scenario: Generating chip-select signals for peripheral ICs (ADCs, DACs, UARTs) in Z80/8051-based embedded systems. IC Role / Device Role / Timing Role: Translates 3-bit address bits into one-of-eight active-low enables, synchronized to CPU RD/WR strobes. Use Value: Provides deterministic 17 ns propagation delay - compatible with sub-10 MHz bus timing budgets and avoids race conditions. |
Use Scenario: Consolidating door lock, window lift, and mirror control signals onto a shared LIN or local CAN sub-bus in BCM subassemblies. IC Role / Device Role / Timing Role: Signal router that isolates diagnostic test modes from normal operation by enabling/disabling signal paths via OE. Use Value: Supports –40°C to +125°C operation and withstands automotive load dump transients due to robust 4.6 V absolute max VCC rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LV251D,118 | SO-16 surface-mount package; identical electrical specs and pinout | Requires rework for PCB layout change; better thermal dissipation and board density | Select when automated SMT assembly and space-constrained layouts are prioritized over through-hole serviceability |
| SN74LV251APW | Texas Instruments version; same logic function but different AC timing (tPHL/tPLH = 19 ns typ @ 3.3 V) and higher ICC (30 µA) | Valid for drop-in replacement only if timing budget allows +2 ns margin and power budget permits +10 µA quiescent increase | Choose only after verifying TI's SOIC-16 (PW) footprint matches design and confirming VOH/VOL tolerances align with system noise margins |
Compared with 74LV251N,112, the 74LV251D,118 offers identical functionality in SO-16 for modern assembly, while SN74LV251APW provides second-source availability but requires validation of timing slack and power headroom - neither is pin-compatible without package adaptation.
Availability
74LV251N,112 is available at Aetrix Electronics and suitable for industrial automation, legacy microcontroller upgrades, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LV251N,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, headquartered in Eindhoven, Netherlands, develops high-reliability semiconductor solutions for automotive, industrial, and IoT markets, with deep heritage in logic and interface ICs dating to Philips Semiconductor.
The 74LV251N,112 belongs to NXP's LV (Low-Voltage) logic family, designed specifically for interoperability across mixed-supply systems and backward compatibility with legacy TTL and CMOS architectures in cost-sensitive industrial control applications.
FAQ
What is the minimum supply voltage at which 74LV251N,112 guarantees correct logic operation?
The 74LV251N,112 is fully functional down to VCC = 1.0 V, with input levels referenced to GND or VCC. However, DC electrical specifications (VIH, VIL, VOH, VOL) are guaranteed only from VCC = 1.2 V onward per the 1998 Philips datasheet. Below 1.2 V, operation is functional but not characterized - use 1.2 V as the design minimum for assured compliance.
Does 74LV251N,112 support true TTL input levels across its full supply range?
No - 74LV251N,112 accepts TTL input levels only when VCC is between 2.7 V and 3.6 V. At lower VCC (e.g., 1.8 V or 2.5 V), inputs must conform to LVCMOS thresholds (VIH ≥ 0.7×VCC, VIL ≤ 0.3×VCC). This dual-mode input behavior is explicitly defined in the "FEATURES" section of the Philips datasheet.
Can both Y and Y outputs of 74LV251N,112 be used simultaneously to drive separate loads?
Yes - Y and Y are true/complement outputs with identical 3-State behavior. When OE is LOW, Y reflects the selected input and Y reflects its inverse, each capable of driving ±6 mA. Both outputs remain in high-impedance state when OE is HIGH, allowing independent bus control without contention.
What is the maximum capacitive load the 74LV251N,112 can drive while maintaining specified propagation delay?
The 74LV251N,112 AC characteristics are specified with CL = 50 pF, and propagation delay increases linearly with load capacitance. At VCC = 3.3 V, tPHL/tPLH rises from 17 ns (CL = 50 pF) to ~41 ns (CL = 100 pF). For designs requiring < 25 ns delay, keep total load (including trace and probe capacitance) below 75 pF.
Is 74LV251N,112 pin-compatible with the older 74LS251 or 74HC251?
The 74LV251N,112 is pin- and function-compatible with 74HC251 and 74HCT251, as confirmed in the "DESCRIPTION" section of the datasheet. It is not pin-compatible with 74LS251: LS devices use different output structures (totem-pole vs. 3-State), lack Y output, and have incompatible DC thresholds - direct substitution would cause bus contention or logic failure.
74LV251N,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74LV
- 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:
- 6mA, 6mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 1V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
74LV251N,112 FAQ
1.How can I place an order for 74LV251N,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LV251N,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 74LV251N,112 reliable?
The price and inventory of 74LV251N,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LV251N,112 is usually 5 days.
3.What payment methods are accepted for 74LV251N,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LV251N,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LV251N,112?
74LV251N,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LV251N,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 74LV251N,112?
For technical support, including 74LV251N,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LV251N,112 requirements.
6.How does Aetrix verify that 74LV251N,112 is sourced from the original manufacturer or authorized distributors?
All 74LV251N,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 74LV251N,112 meets industry standards.
7.What is the process for return or replacement of 74LV251N,112?
All 74LV251N,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74LV251N,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 74LV251N,112 part is unused and in its original packaging.
Return procedure for 74LV251N,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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