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Nexperia USA Inc. 74HCT251D-Q100J
- Part No.:
- 74HCT251D-Q100J
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT251D-Q100J.pdf
- Description:
- IC MULTIPLEXER 1 X 8:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,131
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Product details
Overview
74HCT251D-Q100 from Nexperia is an automotive-grade 8-input, 3-state multiplexer with TTL-compatible inputs, complementary Y/Y̅ outputs, and active-low output enable (OE). It operates from 4.5 V to 5.5 V across -40 °C to +125 °C, supports high-impedance tri-state control, and features CMOS low-power dissipation with 100% tested latch-up immunity (>100 mA per JESD78 Class II Level B). It is used in automotive body control modules for signal routing between sensor banks and microcontroller ADC inputs.
For engineers reviewing the 74HCT251D-Q100 datasheet, 74HCT251D-Q100 pinout, 74HCT251D-Q100 application, or 74HCT251D-Q100 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification, TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V), propagation delay of 22–53 ns (VCC = 4.5–5.5 V, CL = 50 pF), 3-state enable/disable timing (ten = 13–42 ns), and SO16 (SOT109-1) package compatibility with legacy PCB footprints.
Technical Context
The 74HCT251D-Q100 implements a non-inverting 8:1 data selector using standard CMOS logic with TTL-compatible input thresholds. Its three select lines (S0–S2) decode binary addresses to route one of eight data inputs (I0–I7) to the true (Y) and complement (Y̅) outputs, while OE controls full output disable to high-impedance state.
It integrates input clamp diodes for overvoltage tolerance, meets JEDEC JESD8C (2.7–3.6 V) and JESD7A (2.0–6.0 V) standards, and delivers ESD robustness (HBM >2000 V, CDM >1000 V). The device's static and dynamic characteristics are fully specified across automotive temperature extremes (-40 °C to +125 °C) and validated per AEC-Q100 stress test requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation within automotive 5 V rail tolerances and avoids undervoltage lockout. |
| Input Logic Type | TTL-compatible - Accepts standard 5 V TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), eliminating level-shifting in mixed-logic systems. |
| Propagation Delay | 22 ns (typ) to 53 ns (max) at VCC = 4.5–5.5 V, CL = 50 pF - Enables reliable sampling of multiplexed sensor signals up to ~10 MHz effective switching rate. |
| Enable/Disable Time | ten = 13–42 ns, tdis = 14–42 ns - Supports fast channel switching in time-critical diagnostics and multi-sensor polling sequences. |
| Output Drive | ±4 mA (VOH/VOL @ VCC = 4.5 V) - Sufficient to drive standard CMOS/TTL loads without external buffering in control-plane signal routing. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood and powertrain applications where ambient thermal stress exceeds industrial grade limits. |
| AEC-Q100 Grade | Grade 1 - Certified for automotive use with full temperature range coverage, including extended life testing and failure mode analysis. |
Pinout & Package
74HCT251D-Q100 is housed in a plastic small outline package (SO16), designated SOT109-1, with 16 leads and 3.9 mm body width. This RoHS-compliant surface-mount package supports reflow soldering and provides mechanical stability in vibration-prone automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 12, 13, 14, 15 | I0–I7 | Eight independent data inputs - Each accepts standard TTL logic; routed to Y/Y̅ based on S0–S2 address. |
| 5 | Y | True multiplexer output - Delivers selected input signal with non-inverting polarity and 3-state capability. |
| 6 | Y̅ | Complementary output - Provides inverted copy of Y for differential sensing or logic redundancy. |
| 7 | OE | Active-low output enable - Driven LOW to activate outputs; HIGH forces Y/Y̅ into high-impedance OFF-state. |
| 8 | GND | Ground reference - Serves as 0 V return path for all internal circuitry and I/O pins. |
| 9, 10, 11 | S0, S1, S2 | Binary select inputs - Encode 3-bit address (000–111) to choose one of eight data sources. |
| 16 | VCC | Positive supply - Powers internal logic and output drivers; must be decoupled locally per automotive EMC guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive deployment with full temperature range (-40 °C to +125 °C), ESD, and latch-up testing per industry standard. |
| TTL-compatible input thresholds | VIH = 2.0 V (min), VIL = 0.8 V (max) at VCC = 5 V - Ensures interoperability with legacy 5 V microcontrollers and peripheral ICs without level shifters. |
| Complementary Y/Y̅ outputs | Simultaneous true and inverted outputs - Enables noise-immune differential signaling or dual-path logic evaluation in safety-critical subsystems. |
| Input clamp diodes | Integrated protection allowing current-limiting resistor interface to voltages exceeding VCC - Simplifies design of overvoltage-tolerant sensor front-ends. |
| Low dynamic power dissipation | CPD = 46 pF - Minimizes switching current draw in high-frequency multiplexing, reducing thermal load in dense ECUs. |
Applications
| Automotive Body Control Unit (BCU) | Engine Control Module (ECM) Sensor Hub |
|---|---|
Use Scenario: Routing analog sensor signals (e.g., cabin temperature, door position, seat occupancy) from multiple sources to a shared ADC channel. IC Role / Device Role / Timing Role: 8:1 analog multiplexer with 3-state isolation - Selects one sensor per conversion cycle while disabling others to prevent crosstalk and loading. Use Value: Reduces MCU pin count and PCB layer count by consolidating eight analog inputs into one ADC interface, maintaining signal integrity via complementary outputs and fast enable/disable timing. |
Use Scenario: Consolidating diagnostic signals (e.g., knock sensor, MAP, throttle position, coolant temp) for sequential monitoring during engine startup and idle stabilization. IC Role / Device Role / Timing Role: High-reliability signal selector with AEC-Q100 validation - Switches between sensors under real-time firmware control with sub-50 ns propagation delay. Use Value: Enables deterministic, jitter-free sensor polling in safety-critical engine management loops, supported by guaranteed -40 °C to +125 °C operation and latch-up immunity. |
| Advanced Driver Assistance Systems (ADAS) Camera Interface | Electric Power Steering (EPS) Motor Feedback Multiplexing |
Use Scenario: Selecting between multiple camera sensor outputs (e.g., forward-facing, rear-view, surround-view) for image processing pipeline input. IC Role / Device Role / Timing Role: Digital video signal selector with TTL-compatible inputs - Routes parallel pixel data streams synchronized to system clock edges. Use Value: Provides glitch-free channel switching with <42 ns enable/disable times, preventing frame corruption during camera handoff in ADAS vision fusion. |
Use Scenario: Multiplexing rotor position feedback (Hall effect or resolver signals) from dual-motor EPS configurations onto a single controller input. IC Role / Device Role / Timing Role: Fault-tolerant signal router with complementary outputs - Delivers redundant position data paths to enhance functional safety compliance (ISO 26262 ASIL-B). Use Value: Supports dual-channel motor control architecture with built-in signal inversion capability (Y/Y̅), reducing need for external inverters and improving BOM efficiency. |
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-Q100 | CMOS-level inputs (VIH = 3.15 V min at VCC = 4.5 V); wider 2.0–6.0 V supply range | Better suited for mixed-voltage systems (e.g., 3.3 V logic interfacing with 5 V sensors) but incompatible with pure TTL source drivers | Select when interfacing with HC-family logic or wide-supply designs; avoid if driving from legacy 5 V TTL gates. |
| SN74LV251APWREP | LV-family (1.65–5.5 V), lower propagation delay (17 ns typ), enhanced ESD (HBM >8 kV), same SO16 footprint | Qualified per MIL-PRF-38535 Class V for extended reliability; not AEC-Q100 certified but widely used in automotive Tier 1 programs | Choose for higher-speed or military-grade ruggedness requirements; verify AEC-Q100 compliance separately if required for OEM submission. |
Compared with 74HC251D-Q100 and SN74LV251APWREP, the 74HCT251D-Q100 uniquely balances TTL interoperability, AEC-Q100 Grade 1 certification, and proven field reliability in production automotive ECUs-making it the preferred choice where legacy 5 V logic integration and formal automotive qualification are mandatory.
Availability
74HCT251D-Q100 is available at Aetrix Electronics and suitable for automotive body control units, engine management systems, and ADAS sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT251D-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 specializing in high-performance, high-reliability logic, analog, and discrete components, with deep expertise in automotive qualification and mass production scalability.
The 74HCT251D-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for signal routing and data selection in harsh-environment electronic control units where AEC-Q100 compliance and thermal resilience are non-negotiable.
FAQ
What is the maximum operating frequency for reliable signal routing with the 74HCT251D-Q100?
The 74HCT251D-Q100 does not specify a maximum clock frequency, but its propagation delay (22–53 ns) and transition time (7–22 ns) support reliable multiplexing of digital signals up to approximately 10 MHz in typical PCB layouts with 50 pF load. For analog sensor multiplexing, bandwidth is limited by output drive strength and board parasitics-not the IC itself-and requires external RC filtering per channel.
Can the 74HCT251D-Q100 drive a 50 pF capacitive load at 5 V while maintaining valid VOH/VOL levels?
Yes. At VCC = 4.5 V and IO = ±4.0 mA, the device guarantees VOH ≥ 3.98 V and VOL ≤ 0.26 V into a 50 pF load, meeting standard TTL and CMOS logic thresholds. These values are verified across -40 °C to +125 °C and align with JEDEC JESD7A requirements for 2.0–6.0 V operation.
Is the 74HCT251D-Q100 pin-compatible with the 74HC251D-Q100?
Yes-both share identical SO16 (SOT109-1) pinout, pin functions, and mechanical footprint. However, their input threshold specifications differ: 74HCT251D-Q100 accepts TTL-level inputs (VIH ≥ 2.0 V), while 74HC251D-Q100 requires CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V). Swapping them requires verifying source driver compatibility.
Does the 74HCT251D-Q100 support hot insertion or live insertion into a powered system?
No. The device lacks explicit hot-swap protection circuitry. While input clamp diodes allow limited overvoltage tolerance (±20 mA clamping current), applying signals before VCC ramp-up or removing VCC while inputs are active risks latch-up or parametric shift. Automotive designs must follow controlled power sequencing per ISO 16750-2.
74HCT251D-Q100J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SO
74HCT251D-Q100J FAQ
1.How can I place an order for 74HCT251D-Q100J through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT251D-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 74HCT251D-Q100J reliable?
The price and inventory of 74HCT251D-Q100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT251D-Q100J is usually 5 days.
3.What payment methods are accepted for 74HCT251D-Q100J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT251D-Q100J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT251D-Q100J?
74HCT251D-Q100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT251D-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 74HCT251D-Q100J?
For technical support, including 74HCT251D-Q100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT251D-Q100J requirements.
6.How does Aetrix verify that 74HCT251D-Q100J is sourced from the original manufacturer or authorized distributors?
All 74HCT251D-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 74HCT251D-Q100J meets industry standards.
7.What is the process for return or replacement of 74HCT251D-Q100J?
All 74HCT251D-Q100J units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT251D-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 74HCT251D-Q100J part is unused and in its original packaging.
Return procedure for 74HCT251D-Q100J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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