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Nexperia USA Inc. 74HC251DB,118
- Part No.:
- 74HC251DB,118
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC251DB,118.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,844
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Product details
Overview
74HC251DB,118 from Nexperia is an 8-input CMOS multiplexer with 3-state complementary outputs (Y and Y), three binary select lines (S0–S2), and active-low output enable (OE). It operates from 2.0 V to 6.0 V, delivers propagation delay as low as 14 ns at VCC = 6.0 V, supports -40 °C to +125 °C ambient range, and features high-impedance OFF-state control for bus-sharing applications in digital logic systems.
For engineers reviewing the 74HC251DB,118 datasheet, 74HC251DB,118 pinout, 74HC251DB,118 application, or 74HC251DB,118 equivalent, this device serves as a precision signal routing component in industrial control I/O expansion, test equipment channel selection, FPGA peripheral interfacing, and legacy TTL/CMOS system upgrades requiring low-power, noise-immune data path control.
Technical Context
The 74HC251DB,118 implements a non-inverting 8:1 multiplexer architecture with fully buffered inputs and dual complementary outputs. Its select logic decodes S2:S0 (3-bit binary) to route exactly one of eight data inputs (I0–I7) to Y, while Y provides the logical inverse - enabling differential signaling or latch-free inversion without external gates.
Output enable (OE) asserts high-impedance on both Y and Y simultaneously, supporting time-multiplexed bus architectures. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors, and static ESD protection meets HBM >2000 V and CDM >1000 V per JEDEC JS-001/JS-002.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 2.0 V to 6.0 V - enables direct interface with 3.3 V and 5 V logic domains without level shifters |
| Propagation delay (In → Y) | 14 ns max at VCC = 6.0 V, CL = 50 pF - supports >35 MHz switching in critical timing paths |
| Output drive strength | ±4.0 mA at VCC = 4.5 V - sufficient to drive 10 LSTTL loads or 15 pF PCB traces directly |
| Input threshold compatibility | CMOS-level inputs (VIH ≥ 70% VCC) - ensures robust noise margin across full supply range |
| Operating temperature | -40 °C to +125 °C - qualified for under-hood industrial and extended-range embedded control |
| Power dissipation capacitance | 44 pF - enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) |
| Enable/disable time | 10 ns (ten) / 11 ns (tdis) at VCC = 6.0 V - allows fast bus arbitration with minimal dead time |
Pinout & Package
74HC251DB,118 is supplied in SSOP16 (SOT338-1) package: plastic shrink small outline, 16 leads, body width 5.3 mm, pitch 0.65 mm. Pin 1 index marked by notch or dot; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | I3 | Data input channel 3 - routed to Y when S2:S0 = 011 |
| 2 | I2 | Data input channel 2 - routed to Y when S2:S0 = 010 |
| 3 | I4 | Data input channel 4 - routed to Y when S2:S0 = 100 |
| 4 | I1 | Data input channel 1 - routed to Y when S2:S0 = 001 |
| 5 | I5 | Data input channel 5 - routed to Y when S2:S0 = 101 |
| 6 | I0 | Data input channel 0 - routed to Y when S2:S0 = 000 (default/lowest address) |
| 7 | I6 | Data input channel 6 - routed to Y when S2:S0 = 110 |
| 8 | I7 | Data input channel 7 - routed to Y when S2:S0 = 111 (highest address) |
| 9 | S0 | LSB select input - determines bit-0 of 3-bit address decoding |
| 10 | S1 | Bit-1 select input - contributes to full 8-channel decode resolution |
| 11 | S2 | MSB select input - completes 3-bit binary selection vector |
| 12 | Y | True output - reflects selected input (I0–I7) when OE = LOW |
| 13 | Y | Complementary output - inverted copy of Y, usable for differential receivers or logic inversion |
| 14 | OE | Active-low output enable - HIGH forces Y/Y into high-Z; essential for shared-bus contention avoidance |
| 15 | GND | Ground reference - must be low-impedance connection to minimize ground bounce in multi-channel switching |
| 16 | VCC | Positive supply - decoupling capacitor (100 nF ceramic) required within 5 mm of pin for stable operation |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range (2.0–6.0 V) | Eliminates need for separate voltage regulators in mixed-supply systems; supports battery-backed 3.3 V and legacy 5 V rails |
| CMOS low power dissipation | ICC ≤ 8 μA typical at VCC = 6.0 V - enables always-on monitoring circuits with sub-μW standby consumption |
| High noise immunity | Input hysteresis and >40% VCC noise margin ensure reliable operation in electrically noisy PLC cabinets or motor-drive environments |
| Latch-up immunity >100 mA | Meets JESD78 Class II Level B - prevents destructive parasitic SCR activation during transient overvoltage events |
| Clamp diode protected inputs | Allows safe connection to 12 V sensors or open-collector signals using simple series resistors, reducing BOM count |
Applications
| Industrial I/O Expansion | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing 8 analog sensor channels into a single ADC input on a microcontroller-based condition monitoring board. IC Role / Device Role / Timing Role: Signal selector that routes one of eight conditioned sensor outputs to a shared SAR ADC, synchronized to MCU GPIO-controlled S0–S2 and OE. Use Value: Reduces component count vs. discrete analog switches; eliminates timing skew between channels due to matched internal propagation delays (tpd variation < 2 ns). |
Use Scenario: Routing stimulus signals from multiple pattern generators to a DUT's input pins in a boundary-scan test fixture. IC Role / Device Role / Timing Role: High-speed digital path selector enabling per-pin stimulus assignment without FPGA reconfiguration overhead. Use Value: Enables sub-20 ns channel switching with guaranteed monotonic transitions - critical for setup/hold compliance in high-speed digital test vectors. |
| FPGA Peripheral Interface | Legacy System Upgrade |
Use Scenario: Connecting eight parallel status LEDs or discrete indicators to a limited number of FPGA I/O banks. IC Role / Device Role / Timing Role: Output demultiplexer controlled by FPGA GPIOs to serialize LED drive signals onto shared cathode/anode lines. Use Value: Offloads FPGA pin resources while maintaining real-time visibility - Y/Y outputs drive common-cathode LED arrays directly with no external inverters needed. |
Use Scenario: Replacing obsolete 74LS251 in a vintage industrial controller where 5 V TTL logic remains in service. IC Role / Device Role / Timing Role: Drop-in CMOS-compatible upgrade offering lower power, higher noise margin, and extended temperature support. Use Value: Eliminates thermal derating concerns in unventilated enclosures; maintains identical pinout and truth table while cutting supply current by >95% vs. LS family. |
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 package (SOT109-1); 3.9 mm body width; higher thermal resistance (12.4 mW/K derating above 110 °C) | Better suited for wave-soldered through-hole PCBs or legacy layouts with SOIC footprints | Select when mechanical compatibility with existing SO16 land patterns is required; avoid in high-density SSOP layouts |
| SN74HC251PWR | TSSOP16 package (SOT403-1); 4.4 mm body width; lower thermal resistance (8.5 mW/K derating above 91 °C) | Optimized for fine-pitch surface-mount assembly and thermally constrained compact modules | Prefer for new designs targeting automated pick-and-place yield and improved power density; verify solder paste volume for 0.65 mm pitch |
Compared with 74HC251DB,118, the SO16 variant offers easier manual rework but higher junction temperature rise under load, while the TSSOP version improves thermal performance and footprint efficiency at the cost of tighter assembly tolerances.
Availability
74HC251DB,118 is available at Aetrix Electronics and suitable for industrial control I/O expansion, automated test equipment channel routing, FPGA peripheral serialization, and legacy system upgrades requiring stable component supply across extended temperature ranges.
Supply support for 74HC251DB,118 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 delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and manufacturability in high-volume industrial and consumer applications.
The 74HC251DB,118 belongs to Nexperia's 74HC logic family - engineered for low-power, wide-voltage CMOS compatibility in space-constrained, thermally demanding embedded systems where signal integrity and long-term supply stability are critical.
FAQ
Can 74HC251DB,118 operate reliably at 2.0 V supply?
Yes. The device is fully specified down to 2.0 V: VIH minimum is 1.5 V (75% of VCC), VOL maximum is 0.26 V at 4.0 mA load, and propagation delay remains within 170 ns. This enables direct integration with 2.0 V microcontrollers and battery-powered sensors without level translation.
What is the function of the complementary Y output?
The Y output provides the logical inverse of Y and shares identical timing characteristics. It enables direct connection to differential receivers, simplifies implementation of XOR/XNOR functions with external gates, and supports fail-safe monitoring where both true and complement states must be observed simultaneously.
Does 74HC251DB,118 require external pull-up resistors on OE?
No. OE is active-low and internally compatible with standard CMOS logic levels. When driven by a microcontroller GPIO, OE can be tied directly to GND for permanent enable or to a logic output without pull-ups. External pull-down is only needed if OE must default to enabled during reset.
How does input clamping affect interfacing with 12 V sensors?
Clamp diodes on all inputs allow safe connection to 12 V sources when paired with a series current-limiting resistor (e.g., 10 kΩ limits IIK to <2 mA at 12 V). This avoids external protection components while preserving signal integrity for slow-switching industrial sensors.
74HC251DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74HC251DB,118 FAQ
1.How can I place an order for 74HC251DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC251DB,118 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 74HC251DB,118 reliable?
The price and inventory of 74HC251DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC251DB,118 is usually 5 days.
3.What payment methods are accepted for 74HC251DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC251DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC251DB,118?
74HC251DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC251DB,118 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 74HC251DB,118?
For technical support, including 74HC251DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC251DB,118 requirements.
6.How does Aetrix verify that 74HC251DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HC251DB,118 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 74HC251DB,118 meets industry standards.
7.What is the process for return or replacement of 74HC251DB,118?
All 74HC251DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC251DB,118, 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 74HC251DB,118 part is unused and in its original packaging.
Return procedure for 74HC251DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC251DB,118 Tags
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SN74HC138DR
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TC7SB3157CFU,LF(CT
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74CBTLV3257PW,118
Nexperia USA Inc.
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74CBTLV3257GUX
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P3S0200GMX
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SN74CB3Q3245PWR
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TCA9546APWR
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SN74HC138N
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