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Nexperia USA Inc. 74HC238D-Q100J
- Part No.:
- 74HC238D-Q100J
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HC238D-Q100J.pdf
- Description:
- IC DECODER/DEMUX 1 X 3:8 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,306
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Product details
Overview
74HC238D-Q100 from Nexperia is an automotive-qualified 3-to-8 line decoder/demultiplexer with three binary address inputs (A0–A2), eight active-HIGH mutually exclusive outputs (Y0–Y7), and three enable inputs (E1, E2 active LOW; E3 active HIGH). It operates from -40 °C to +125 °C, supports CMOS-level inputs, and features clamp diodes for overvoltage-tolerant interfacing-used in automotive memory chip select decoding and modular logic expansion.
For engineers reviewing the 74HC238D-Q100 datasheet, 74HC238D-Q100 pinout, 74HC238D-Q100 application, or 74HC238D-Q100 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification, SO16 package compatibility, propagation delay of 14–45 ns (VCC = 4.5–6.0 V), enable-input-driven demultiplexing capability, and dual-family support (74HC/74HCT).
Technical Context
This device implements a combinational logic decoder with strict mutual exclusivity: only one output goes HIGH per valid input combination when E1=E2=LOW and E3=HIGH. Its triple-enable architecture enables cascading-e.g., four units plus one inverter achieve 1-of-32 decoding without external logic.
The input structure includes integrated clamp diodes, allowing safe interface to signals exceeding VCC when used with current-limiting resistors. Output drive strength is ±25 mA, with VOH ≥ 3.98 V and VOL ≤ 0.26 V at VCC = 4.5 V and IO = ±4.0 mA-ensuring robust TTL/CMOS interoperability in mixed-signal automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 3-to-8 line decoder / 1-to-8 demultiplexer with triple enable control |
| Supply voltage range | 2.0 V to 6.0 V - supports wide automotive rail flexibility including 3.3 V and 5 V systems |
| Propagation delay (An→Yn) | 14 ns (typ) at VCC = 6.0 V - enables timing-critical address decoding in fast microcontroller peripherals |
| Output drive (IO) | ±25 mA - sufficient to directly drive LEDs, small logic loads, or enable lines of downstream ICs |
| Operating temperature | -40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood and powertrain applications |
| Input compatibility | CMOS-level (74HC variant) - VIH = 3.15 V min at VCC = 4.5 V; eliminates need for level shifters in 5 V domains |
| ESD rating | HBM > 2000 V, CDM > 1000 V - meets automotive board-level reliability requirements for handling and assembly |
Pinout & Package
74HC238D-Q100 uses the SO16 plastic small outline package (SOT109-1), 16-pin, 3.9 mm body width, with gull-wing leads and standard JEDEC MS-012 footprint. Pin 1 index located at top-left corner; pin 1 = A0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A0) | Address input | LSB of 3-bit binary address; determines output Y0–Y7 mapping in conjunction with A1/A2 |
| 2 (A1) | Address input | Middle bit of address; combined with A0/A2 defines decoded output activation |
| 3 (A2) | Address input | MSB of address; completes 3-bit selection for one-of-eight output assertion |
| 4 (E1) | Enable input | Active-LOW global enable; must be LOW with E2=LOW and E3=HIGH for any output to activate |
| 5 (E2) | Enable input | Second active-LOW enable; provides hierarchical control for multi-chip decoding trees |
| 6 (E3) | Enable input | Active-HIGH enable; complements E1/E2 to form three-input AND gate for output gating |
| 7 (Y7) | Output | Active-HIGH decoded output corresponding to A2A1A0 = 111; drives load when enabled |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and I/O; requires low-impedance PCB connection |
| 9 (Y6) | Output | Active-HIGH output for A2A1A0 = 110; shares same timing and drive specs as Y0–Y7 |
| 10 (Y5) | Output | Active-HIGH output for A2A1A0 = 101; electrically identical to other Yx outputs |
| 11 (Y4) | Output | Active-HIGH output for A2A1A0 = 100; supports demultiplexing when E1/E2 used as strobes |
| 12 (Y3) | Output | Active-HIGH output for A2A1A0 = 011; usable as chip select for peripheral devices |
| 13 (Y2) | Output | Active-HIGH output for A2A1A0 = 010; compatible with TTL/CMOS fan-out requirements |
| 14 (Y1) | Output | Active-HIGH output for A2A1A0 = 001; supports direct LED driving with series resistor |
| 15 (Y0) | Output | Active-HIGH output for A2A1A0 = 000; lowest-address output, commonly used for boot device selection |
| 16 (VCC) | Supply voltage | Positive supply rail (2.0–6.0 V); bypass capacitor (100 nF) recommended near pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use across -40 °C to +125 °C ambient, including thermal cycling and humidity testing |
| Triple enable architecture | E1/E2 (active LOW) + E3 (active HIGH) enables hierarchical decoding and seamless 1-of-32 expansion with minimal external logic |
| Clamp diode protected inputs | Allows safe interface to voltages up to VCC + 0.5 V using series current-limiting resistors-reduces need for external protection |
| SO16 package with side-wettable flanks | SOT109-1 footprint supports automated optical inspection (AOI) of solder joints-critical for automotive manufacturing traceability |
| Demultiplexing mode operation | One enable input (e.g., E1) serves as data input while others act as strobes-enables 1-to-8 signal routing without reconfiguration |
Applications
| Automotive Memory Chip Select | Modular Logic Expansion |
|---|---|
|
Use Scenario: Selecting among multiple flash or EEPROM devices in an ADAS domain controller. IC Role / Device Role / Timing Role: Address decoder generating dedicated chip-select signals for up to eight memory ICs based on MCU address bus bits A0–A2. Use Value: Eliminates discrete logic gates; reduces BOM count and PCB area while maintaining deterministic <45 ns propagation delay for real-time firmware access. |
Use Scenario: Building a 1-of-32 decoder for engine control unit (ECU) I/O expansion. IC Role / Device Role / Timing Role: One of four parallel 74HC238D-Q100 units, coordinated by a single inverter, to decode five address lines into 32 unique outputs. Use Value: Achieves full 5-to-32 decoding with zero external combinational logic-improving design reuse and reducing timing skew across channels. |
| Body Control Module Signal Routing | Instrument Cluster Display Multiplexing |
|
Use Scenario: Routing CAN/LIN wake-up signals to individual submodules (door locks, lighting, HVAC) in a BCM. IC Role / Device Role / Timing Role: Demultiplexer using E1 as data input and A0–A2 as channel address, enabling selective activation of wake-line drivers. Use Value: Enables low-power selective wake-up with <100 ns total latency (address + enable setup), minimizing system-wide current draw during sleep modes. |
Use Scenario: Driving segmented backlight zones or multiplexed LED indicators in a digital instrument cluster. IC Role / Device Role / Timing Role: Decoder asserting one of eight Yx outputs to enable corresponding LED driver IC or MOSFET gate. Use Value: Provides precise, glitch-free segment activation synchronized to display refresh cycles-no additional debouncing or timing circuitry required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-to-8 decoder/demultiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT238D-Q100 | TTL-compatible inputs (VIH = 2.0 V min at VCC = 4.5 V); otherwise identical pinout, timing, and packaging | Better suited for mixed 5 V TTL/CMOS systems where input thresholds must match legacy logic families | Select when interfacing with 74LS or older microcontrollers lacking CMOS-level output swing |
| SN74HC238PWR | Industrial-grade (not AEC-Q100 qualified); TSSOP-16 package; identical electrical specs but no automotive qualification | Limited to non-automotive industrial or consumer applications requiring same functionality at lower cost | Choose for cost-sensitive non-automotive designs where AEC-Q100 compliance is unnecessary |
Compared with 74HC238D-Q100, the 74HCT238D-Q100 offers higher noise immunity in noisy 5 V environments due to tighter TTL input thresholds, while the SN74HC238PWR trades automotive qualification for broader commercial availability and lower unit pricing-making each optimal for distinct system-level reliability and sourcing requirements.
Availability
74HC238D-Q100 is available at Aetrix Electronics and suitable for automotive body control modules, ADAS domain controllers, and engine management systems requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for 74HC238D-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 leading semiconductor manufacturer specializing in high-performance, high-reliability logic, analog, and discrete components, with core expertise in automotive-qualified silicon.
The 74HC238D-Q100 belongs to Nexperia's automotive logic portfolio, designed specifically for robust address decoding and signal routing in harsh-temperature vehicle subsystems-including powertrain, chassis, and infotainment domains.
FAQ
What is the maximum clock frequency supported by the 74HC238D-Q100?
The 74HC238D-Q100 is a static combinational logic device-not a clocked sequential IC-so it has no defined clock frequency. Its performance is governed by propagation delay: 14 ns typical (VCC = 6.0 V), supporting address transitions up to ~35 MHz in worst-case cascaded setups. System timing depends on input slew rate and load capacitance, not internal clocking.
Can the 74HC238D-Q100 be used as a demultiplexer, and how is that configured?
Yes. Configure one active-LOW enable input (e.g., E1) as the data input, hold E2 LOW and E3 HIGH, then apply address bits A0–A2 to route the data to one of eight outputs (Y0–Y7). This achieves true 1-to-8 demultiplexing with no external components-verified in the functional description and truth table of the official datasheet.
Does the SO16 package (SOT109-1) support lead-free reflow soldering?
Yes. The 74HC238D-Q100 in SOT109-1 is RoHS-compliant and qualified for standard lead-free reflow profiles (JEDEC J-STD-020), including peak temperatures up to 260 °C. Its gull-wing leads and thermal mass are optimized for consistent wetting and void-free joints in automotive manufacturing lines.
How does the clamp diode protection affect interfacing with 12 V sensor signals?
The integrated input clamp diodes allow safe connection to signals up to VCC + 0.5 V. To interface with 12 V sensors, use a series current-limiting resistor (e.g., 10 kΩ) to restrict IIK to ≤±20 mA-per absolute maximum ratings. This avoids external TVS diodes while maintaining signal integrity and AEC-Q100 reliability.
74HC238D-Q100J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Decoder/Demultiplexer
- Circuit:
- 1 x 3:8
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HC238D-Q100J FAQ
1.How can I place an order for 74HC238D-Q100J through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC238D-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 74HC238D-Q100J reliable?
The price and inventory of 74HC238D-Q100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC238D-Q100J is usually 5 days.
3.What payment methods are accepted for 74HC238D-Q100J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC238D-Q100J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC238D-Q100J?
74HC238D-Q100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC238D-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 74HC238D-Q100J?
For technical support, including 74HC238D-Q100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC238D-Q100J requirements.
6.How does Aetrix verify that 74HC238D-Q100J is sourced from the original manufacturer or authorized distributors?
All 74HC238D-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 74HC238D-Q100J meets industry standards.
7.What is the process for return or replacement of 74HC238D-Q100J?
All 74HC238D-Q100J units undergo pre-shipment inspection (PSI). If there is an issue with 74HC238D-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 74HC238D-Q100J part is unused and in its original packaging.
Return procedure for 74HC238D-Q100J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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