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NXP Semiconductors 74HC257D/AUJ
- Part No.:
- 74HC257D/AUJ
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HC257D/AUJ.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,524
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Product details
Overview
74HC257D/AUJ from Nexperia is a quad 2-input CMOS multiplexer with non-inverting 3-state outputs, operating across 2.0 V to 6.0 V supply, delivering propagation delay as low as 10 ns at 6.0 V and supporting industrial temperature range up to +125 °C. It enables data routing in bus-oriented digital systems such as microcontroller peripheral interfaces and logic-level signal selection.
For engineers reviewing the 74HC257D/AUJ datasheet, 74HC257D/AUJ pinout, 74HC257D/AUJ application, or 74HC257D/AUJ equivalent, key selection considerations include its single common select input (S), active-low 3-state enable (OE), TTL-compatible input thresholds on 74HCT variants, and SO16 package compatibility with standard PCB footprints for legacy logic upgrades.
Technical Context
The 74HC257D/AUJ implements four independent 2:1 multiplexers sharing one global select line (S) and one 3-state output enable (OE), with all outputs disabled (high-impedance) when OE is HIGH. Its CMOS architecture ensures rail-to-rail output swing and low static current - ICC ≤ 160 μA over full temperature range.
Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The device complies with JESD7A (2.0 V–6.0 V) and JESD8C (2.7 V–3.6 V), and meets JEDEC Class II Level B latch-up immunity (>100 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system integration including 3.3 V and 5 V logic domains |
| Propagation Delay (tpd) | 10 ns (max) at VCC = 6.0 V - enables reliable operation in high-speed control paths up to ~50 MHz toggle rate |
| Output Drive Strength | ±7.8 mA at VCC = 6.0 V - sufficient to drive standard CMOS loads and short PCB traces without buffering |
| Input Thresholds (74HC) | VIH = 4.2 V, VIL = 1.8 V at VCC = 6.0 V - ensures noise margin >1.2 V under worst-case conditions |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial and under-hood embedded applications |
| Power Dissipation Capacitance | CPD = 45 pF per multiplexer - enables accurate dynamic power estimation in clocked logic designs |
Pinout & Package
74HC257D/AUJ is supplied in SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, 1.27 mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Common Data Select Input | Selects between I0 and I1 inputs for all four channels simultaneously |
| 2,5,11,14 (1I0–4I0) | Source 0 Data Inputs | First input set for each of the four 2:1 multiplexers |
| 3,6,10,13 (1I1–4I1) | Source 1 Data Inputs | Second input set for each of the four 2:1 multiplexers |
| 4,7,9,12 (1Y–4Y) | 3-State Multiplexer Outputs | Non-inverting outputs enabled only when OE = LOW; otherwise high-Z |
| 8 (GND) | Ground Reference | Return path for all internal circuitry and output loads |
| 15 (OE) | Output Enable (Active LOW) | Global control for bus contention management - disables all outputs when HIGH |
| 16 (VCC) | Positive Supply | Primary power rail; decoupling capacitor required within 10 mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Single-select quad multiplexing | One S pin controls all four 2:1 channels - reduces control logic overhead vs. discrete mux ICs |
| 3-state bus interface | OE-driven high-impedance outputs allow direct connection to shared data buses without external isolation |
| Input clamp diodes | Enables safe overvoltage tolerance (up to VCC + 0.5 V) with series current-limiting resistors |
| High noise immunity | Typical noise margin >1.2 V at 6 V supply - robust against EMI in industrial control environments |
| JEDEC-compliant latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - eliminates risk of destructive latch-up during transient events |
Applications
| Industrial PLC I/O Expansion | Microcontroller Peripheral Multiplexing |
|---|---|
Use Scenario: Routing analog sensor readings or digital status signals from multiple field devices onto a single ADC input or GPIO bank. IC Role / Device Role / Timing Role: Quad 2:1 selector consolidates four parallel input streams into one time-shared channel under MCU software control. Use Value: Reduces PCB trace count and microcontroller pin usage by 75% versus individual signal routing. |
Use Scenario: Sharing limited UART, SPI or I²C pins among multiple peripherals (e.g., EEPROM, display driver, sensor hub). IC Role / Device Role / Timing Role: Enables dynamic reconfiguration of serial bus connections via S and OE control lines synchronized to firmware state machine. Use Value: Eliminates need for mechanical jumpers or solder bridges - supports field-upgradable peripheral topology. |
| Legacy Bus Interface Translation | Digital Test Equipment Signal Switching |
Use Scenario: Adapting 5 V TTL-level control signals to modern 3.3 V FPGA I/O banks while preserving timing integrity. IC Role / Device Role / Timing Role: Acts as level-shifting multiplexer with CMOS input thresholds compatible with both voltage domains. Use Value: Avoids dedicated level translators; maintains sub-15 ns propagation delay across voltage translation. |
Use Scenario: Automated test fixture routing of stimulus signals to DUT pins or measurement probes to selected nodes. IC Role / Device Role / Timing Role: Provides deterministic, low-jitter signal path selection under GPIB/LXI controller command. Use Value: Enables <100 ns switching repeatability and <1 pF channel capacitance - critical for high-frequency parametric testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT257D | TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V at 5 V); identical pinout and AC specs | Better suited for mixed 5 V TTL/CMOS systems where input drive originates from legacy logic families | Select 74HCT257D when interfacing directly to 74LS or other TTL outputs without level shifters |
| SN74LV257APW | Lower VCC range (1.65 V–5.5 V); higher drive (±12 mA); TSSOP16-only packaging | Optimized for ultra-low-voltage portable systems and higher fanout requirements | Choose SN74LV257APW for battery-powered designs requiring 1.8 V operation or stronger output drive |
Compared with 74HC257D/AUJ, 74HCT257D offers improved input compatibility with legacy TTL sources but shares identical timing and packaging; SN74LV257APW extends voltage flexibility downward and increases output strength, though it lacks SO16 availability and requires layout revision.
Availability
74HC257D/AUJ is available at Aetrix Electronics and suitable for industrial automation, embedded control, and test instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC257D/AUJ 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 focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HC257D/AUJ belongs to Nexperia's industry-standard HC logic family, designed specifically for drop-in replacement of legacy 74-series logic in space-constrained, thermally demanding applications.
FAQ
What is the maximum supply voltage rating for the 74HC257D/AUJ?
The absolute maximum supply voltage (VCC) for the 74HC257D/AUJ is +7.0 V, but the recommended operating range is 2.0 V to 6.0 V. Operation above 6.0 V voids guaranteed performance and risks permanent damage per IEC 60134 limiting values. For sustained reliability, maintain VCC ≤ 6.0 V with ±5 % regulation.
Does the 74HC257D/AUJ support 3.3 V logic systems?
Yes, the 74HC257D/AUJ is fully specified at 3.3 V (within its 2.0 V–6.0 V range). At VCC = 3.3 V, VIH = 2.31 V (min), VIL = 0.99 V (max), and tpd ≈ 18 ns (max), making it compatible with standard 3.3 V CMOS interfaces. No level shifting is required when driving or driven by 3.3 V devices.
How does the 3-state output enable (OE) function on the 74HC257D/AUJ?
The OE pin (Pin 15) is active LOW: when OE = LOW, all four Y outputs reflect the selected I0/I1 inputs; when OE = HIGH, all Y outputs enter high-impedance (Z) state regardless of S or input states. This allows safe connection to shared buses without contention, and is electrically identical across all HC/HCT variants.
Can the 74HC257D/AUJ be used as a level shifter between 5 V and 3.3 V domains?
The 74HC257D/AUJ can translate 5 V inputs to 3.3 V outputs when powered at 3.3 V, provided input voltages do not exceed VCC + 0.5 V (i.e., ≤3.8 V). For true 5 V → 3.3 V bidirectional translation, external current-limiting resistors and clamping diodes are required - consult Section 1 of the datasheet for safe overvoltage interface guidance.
What is the thermal derating behavior of the 74HC257D/AUJ in SO16 package?
In the SO16 (SOT109-1) package, the 74HC257D/AUJ total power dissipation (Ptot) derates linearly at 12.4 mW/K above +110 °C ambient. At +125 °C, Ptot is reduced to 313 mW from the 500 mW rated value at +25 °C - a critical consideration for sealed enclosures or high-density board layouts without forced airflow.
74HC257D/AUJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 7.8mA, 7.8mA
- 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-SO
74HC257D/AUJ FAQ
1.How can I place an order for 74HC257D/AUJ through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC257D/AUJ 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 74HC257D/AUJ reliable?
The price and inventory of 74HC257D/AUJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC257D/AUJ is usually 5 days.
3.What payment methods are accepted for 74HC257D/AUJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC257D/AUJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC257D/AUJ?
74HC257D/AUJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC257D/AUJ 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 74HC257D/AUJ?
For technical support, including 74HC257D/AUJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC257D/AUJ requirements.
6.How does Aetrix verify that 74HC257D/AUJ is sourced from the original manufacturer or authorized distributors?
All 74HC257D/AUJ 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 74HC257D/AUJ meets industry standards.
7.What is the process for return or replacement of 74HC257D/AUJ?
All 74HC257D/AUJ units undergo pre-shipment inspection (PSI). If there is an issue with 74HC257D/AUJ, 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 74HC257D/AUJ part is unused and in its original packaging.
Return procedure for 74HC257D/AUJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC257D/AUJ Tags
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