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Nexperia USA Inc. 74HCT251DB-Q100J
- Part No.:
- 74HCT251DB-Q100J
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT251DB-Q100J.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,724
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Product details
Overview
74HCT251DB-Q100 from Nexperia is an automotive-grade 8-input, 3-state multiplexer with TTL-compatible inputs, complementary outputs (Y and Y), active-low output enable (OE), and three binary select lines (S0–S2). It operates from 4.5 V to 5.5 V across –40 °C to +125 °C, supports high-impedance tri-state control, and is qualified to AEC-Q100 Grade 1 for engine control unit signal routing.
For engineers reviewing the 74HCT251DB-Q100 datasheet, 74HCT251DB-Q100 pinout, 74HCT251DB-Q100 application, or 74HCT251DB-Q100 equivalent, this device serves as a robust data selector in automotive body control modules, transmission control logic, ADAS sensor interface multiplexing, and powertrain diagnostics where input-level compatibility, thermal resilience, and fail-safe output disable are critical.
Technical Context
The 74HCT251DB-Q100 implements a non-inverting 8:1 multiplexer architecture with dual complementary outputs and synchronous 3-bit address decoding. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) ensure direct interfacing with legacy 5 V microcontrollers and logic families without level-shifting.
Tri-state operation is controlled solely by the active-low OE input, which forces both Y and Y into high-impedance when asserted. The device features integrated input clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors - a key requirement in mixed-voltage automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Matches standard 5 V automotive logic rails and avoids brown-out during cranking transients. |
| Operating Temperature | –40 °C to +125 °C - Qualified for under-hood applications including engine control and transmission modules. |
| Propagation Delay | 22 ns to 53 ns (VCC = 4.5–5 V, CL = 50 pF) - Enables reliable timing in real-time control loops up to ~10 MHz switching rate. |
| Output Drive | ±4 mA (VOH/VOL @ VCC = 4.5 V) - Sufficient to drive multiple CMOS/TTL loads or trace capacitance in PCB interconnects. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees noise-immune recognition of TTL logic levels without external biasing. |
| AEC-Q100 Grade | Grade 1 - Certified for automotive use per AEC-Q100 Rev G, including HTOL, TC, ESD, and latch-up testing. |
| Power Dissipation | CPD = 46 pF - Enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal budgeting in dense ECUs. |
Pinout & Package
74HCT251DB-Q100 is housed in a 16-pin SSOP package (SOT338-1), measuring 6.2 mm × 5.3 mm × 1.95 mm with 0.65 mm lead pitch. This compact, surface-mount outline provides improved thermal performance over SO16 and reduced board area versus TSSOP16 while maintaining mechanical robustness for automotive reflow and vibration environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 12, 13, 14, 15 | Data Inputs (I0–I7) | Eight independent digital inputs selected via S0–S2; electrically identical, CMOS-compatible with clamp diodes. |
| 5 | True Output (Y) | Non-inverted multiplexed output; driven HIGH/LOW or placed in high-Z when OE = HIGH. |
| 6 | Complementary Output (Y) | Inverted copy of Y; enables differential signaling or logic inversion without external gates. |
| 7 | Output Enable (OE) | Active-low control: OE = LOW enables Y/Y; OE = HIGH forces both outputs to high-impedance state. |
| 8 | GND | Logic and power ground reference; must be low-inductance connection to minimize switching noise coupling. |
| 9, 10, 11 | Select Inputs (S0, S1, S2) | 3-bit binary address bus determining which Ix drives Y/Y; S0 = LSB, S2 = MSB. |
| 16 | VCC | Positive supply rail (4.5–5.5 V); requires local 100 nF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-Compatible Input Levels | VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5 V - Eliminates need for level shifters when interfacing with legacy 5 V MCUs or discrete drivers. |
| AEC-Q100 Grade 1 Qualification | Validated for –40 °C to +125 °C operation with HTOL, temperature cycling, and ESD (HBM > 2 kV, CDM > 1 kV) - Meets OEM requirements for powertrain ECUs. |
| Clamp Diode Protection | Integrated input diodes allow safe connection to signals up to VCC + 0.5 V using series current-limiting resistors - Critical for CAN/LIN bus monitoring or sensor fault injection circuits. |
| Complementary Outputs (Y/Y) | Dual true/inverted outputs reduce external inverter count in parity generation, differential bus driving, or redundant signal paths. |
| Low Dynamic Power | CPD = 46 pF - Enables predictable power modeling in battery-sensitive modules like body controllers and gateway units. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Selecting among eight knock sensor analog-to-digital converter outputs for real-time combustion analysis. IC Role / Device Role / Timing Role: Data selector routing conditioned sensor data to a single ADC channel under MCU command. Use Value: Reduces component count vs. eight individual ADC interfaces; maintains deterministic latency (<53 ns) for closed-loop spark timing correction. |
Use Scenario: Multiplexing door lock actuator status feedback signals (open/closed/fault) from four doors into a central diagnostic bus. IC Role / Device Role / Timing Role: Signal concentrator enabling shared microcontroller GPIO usage across multiple mechanical subsystems. Use Value: Saves four dedicated input pins; high-impedance disable isolates faulty channels during diagnostics without disrupting other door monitoring. |
| Transmission Control Unit (TCU) | Advanced Driver Assistance Systems (ADAS) |
|
Use Scenario: Routing gear position sensor data (PRNDL) and turbine speed signals to a safety monitor IC for ASIL-B compliance checking. IC Role / Device Role / Timing Role: Safety-critical signal path selector with guaranteed propagation delay and fail-safe OE control. Use Value: Enables hardware-based redundancy verification; OE assertion disables output during fault conditions, preventing erroneous gear commands. |
Use Scenario: Consolidating radar echo return signals from eight antenna elements into a single RF sampling chain for beamforming preprocessing. IC Role / Device Role / Timing Role: High-speed analog front-end multiplexer supporting time-division sampling of phased array inputs. Use Value: Maintains signal integrity with <19 ns transition time (tt) and low output capacitance; complementary outputs support differential ADC input stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT251D-Q100 | SO16 package (SOT109-1), wider body (3.9 mm), higher thermal resistance (12.4 mW/K derating above 110 °C). | Better suited for manual assembly, prototyping, or legacy PCB footprints requiring SOIC-16. | Select when board space allows larger footprint and thermal management uses heatsinking or lower ambient. |
| 74HCT251PW-Q100 | TSSOP16 package (SOT403-1), 4.4 mm body width, tighter 0.65 mm pitch, lower thermal resistance (8.5 mW/K derating above 91 °C). | Preferred for high-density automotive modules where volume and thermal efficiency outweigh hand-solderability. | Select for production boards targeting automated SMT, compact ECUs, or elevated thermal loads near power components. |
Compared with 74HCT251DB-Q100, the D variant offers easier rework and legacy compatibility but sacrifices board density and thermal performance, while the PW variant improves thermal dissipation and miniaturization at the cost of solder joint reliability validation for automotive shock/vibe.
Availability
74HCT251DB-Q100 is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and ADAS sensor fusion systems requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant traceability.
Supply support for 74HCT251DB-Q100 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 automotive, industrial, and consumer applications with emphasis on reliability and energy efficiency.
The 74HCT251DB-Q100 belongs to Nexperia's automotive-qualified logic family, engineered specifically for signal routing in harsh-environment electronic control units where AEC-Q100 compliance, wide temperature operation, and robust ESD immunity are mandatory.
FAQ
Is 74HCT251DB-Q100 pin-compatible with 74HC251DB-Q100?
Yes - both share identical pinout, package (SOT338-1), and functional block diagram. However, 74HCT251DB-Q100 uses TTL-compatible input thresholds (VIH = 2.0 V min), whereas 74HC251DB-Q100 requires CMOS-level inputs (VIH = 3.15 V min at VCC = 4.5 V), making them electrically incompatible without level translation.
What is the maximum clock/data rate supported by 74HCT251DB-Q100?
The device does not operate on a clock; it is combinational. Maximum usable data rate depends on propagation delay and load: with tpd = 22 ns (typ) and CL = 50 pF, reliable operation supports input address changes up to ~10 MHz (100 ns period), assuming setup/hold margins are met by the driving controller.
Can OE be left unconnected in a system?
No - OE must be actively driven. Leaving OE floating risks indeterminate output states due to noise coupling, potentially causing bus contention or unintended high-Z behavior. Tie OE to GND (enabled) or VCC (disabled) via a pull-down/pull-up resistor if not controlled by a processor.
Does 74HCT251DB-Q100 support hot insertion or live swapping?
No - it lacks hot-swap protection circuitry. Applying VCC before GND, or connecting inputs while power is off, may forward-bias internal clamp diodes and cause latch-up or excessive current. Always follow proper power sequencing: GND first, then VCC, then signals.
74HCT251DB-Q100J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- 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:
- 4mA, 4mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
74HCT251DB-Q100J FAQ
1.How can I place an order for 74HCT251DB-Q100J through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT251DB-Q100J 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 74HCT251DB-Q100J reliable?
The price and inventory of 74HCT251DB-Q100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT251DB-Q100J is usually 5 days.
3.What payment methods are accepted for 74HCT251DB-Q100J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT251DB-Q100J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT251DB-Q100J?
74HCT251DB-Q100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT251DB-Q100J 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 74HCT251DB-Q100J?
For technical support, including 74HCT251DB-Q100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT251DB-Q100J requirements.
6.How does Aetrix verify that 74HCT251DB-Q100J is sourced from the original manufacturer or authorized distributors?
All 74HCT251DB-Q100J 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 74HCT251DB-Q100J meets industry standards.
7.What is the process for return or replacement of 74HCT251DB-Q100J?
All 74HCT251DB-Q100J units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT251DB-Q100J, 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 74HCT251DB-Q100J part is unused and in its original packaging.
Return procedure for 74HCT251DB-Q100J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT251DB-Q100J Tags
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