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NXP Semiconductors 74HCT257N,652
- Part No.:
- 74HCT257N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74HCT257N,652.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,562
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Product details
Overview
74HCT257N,652 from Nexperia is a quad 2-input multiplexer with 3-state outputs, designed for bus-oriented data routing in TTL-level logic systems. It operates from 4.5 V to 5.5 V, delivers propagation delay of 13 ns (typical at 5.0 V/15 pF), supports -40 °C to +125 °C ambient range, and features active-low 3-state output enable for direct system bus interfacing.
For engineers reviewing the 74HCT257N,652 datasheet, 74HCT257N,652 pinout, 74HCT257N,652 application, or 74HCT257N,652 equivalent, this device serves as a TTL-compatible, low-power, high-noise-immunity quad MUX for digital signal selection in industrial control, instrumentation, and embedded I/O expansion where precise timing, bus contention avoidance, and wide temperature operation are required.
Technical Context
The 74HCT257N,652 implements four independent 2:1 multiplexers sharing a common select input (S) and a single active-low 3-state output enable (OE). Each channel routes either I0 or I1 to its corresponding Y output based on S level, with all outputs placed in high-impedance state when OE is HIGH.
Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure seamless interfacing with legacy 5 V TTL logic families, while CMOS output structure provides rail-to-rail swing and ±6 mA drive capability under recommended conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL systems without level translation. |
| Propagation Delay | 13 ns (typical, VCC = 5.0 V, CL = 15 pF) - Enables reliable operation in 30+ MHz digital control paths. |
| Output Drive | ±6 mA - Sufficient to drive multiple 74-series inputs or light PCB traces without buffering. |
| Operating Temperature | -40 °C to +125 °C - Qualified for under-hood automotive modules and industrial motor drives. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - Guarantees robust noise margin (>0.4 V) against TTL switching transients. |
| 3-State Enable Polarity | Active LOW on OE pin - Allows direct connection to microcontroller GPIOs for synchronized bus release. |
| Power Dissipation Capacitance | 45 pF per multiplexer - Used to calculate dynamic power (PD = CPD × VCC² × fi × N) in clocked applications. |
Pinout & Package
74HCT257N,652 is supplied in the plastic DIP-16 package (SOT38-4), with 16 leads, 0.3 inch body width, and through-hole mounting. Pin 1 is index-marked; pin 8 is GND and pin 16 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (S) | Common data select input | Single control line determining whether I0 or I1 is routed to all four Y outputs. |
| 2,5,11,14 (1I0–4I0) | Data input 0 for channels 1–4 | First source input per channel; tied together only if uniform selection across all MUXes is required. |
| 3,6,10,13 (1I1–4I1) | Data input 1 for channels 1–4 | Second source input per channel; enables dual-source routing per functional block. |
| 4,7,9,12 (1Y–4Y) | 3-state multiplexer output | Outputs enter high-Z when OE = HIGH, allowing shared bus use without external isolation. |
| 8 (GND) | Ground reference | Return path for all internal logic and output current; must be low-impedance for noise immunity. |
| 15 (OE) | 3-state output enable (active LOW) | Global control for bus arbitration; asserted LOW to enable outputs, HIGH to disable. |
| 16 (VCC) | Supply voltage | Primary power rail; decoupling capacitor (100 nF) required within 1 cm for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible input levels | Ensures plug-and-play integration with legacy 5 V microcontrollers, FPGAs, and logic families without level shifters. |
| 3-state outputs with common enable | Allows up to four independent data paths to share a single 8-bit or 16-bit data bus without contention. |
| High noise immunity | CMOS input structure with hysteresis-like behavior provides >400 mV noise margin at VCC = 5 V. |
| Latch-up immunity >100 mA | Meets JESD78 Class II Level B, enabling safe operation in electrically noisy industrial environments. |
| Wide temperature qualification | Specified from -40 °C to +125 °C - suitable for engine control units, power inverters, and outdoor telecom hardware. |
Applications
| Industrial PLC I/O Expansion | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Multiplexing sensor inputs (temperature, pressure, position) onto a shared ADC interface in modular PLC backplanes. IC Role / Device Role / Timing Role: Quad 2:1 MUX selects between redundant or alternate sensor pairs per channel before digitization. Use Value: Reduces component count by consolidating four discrete MUX functions into one DIP-16 IC, simplifying layout and improving thermal uniformity. |
Use Scenario: Switching between calibration references and DUT signals during automated test sequence execution. IC Role / Device Role / Timing Role: Routes precision voltage sources or stimulus waveforms to DUT pins under microcontroller control. Use Value: 13 ns propagation delay ensures sub-20 ns timing resolution for high-speed parametric testing at 30+ MHz sample rates. |
| Legacy Microcontroller Bus Interface | Embedded Display Data Selection |
Use Scenario: Connecting multiple peripheral devices (EEPROM, DAC, UART) to a single 8-bit data bus on an 8051 or Z80-based controller. IC Role / Device Role / Timing Role: Enables time-multiplexed access to peripherals using address-decoded OE control. Use Value: Active-low OE allows direct GPIO control without inverters; 3-state outputs prevent bus conflicts during idle cycles. |
Use Scenario: Selecting between graphics RAM and character ROM data streams feeding an LCD controller in portable medical devices. IC Role / Device Role / Timing Role: Chooses display memory source based on UI mode (graphical vs. text-only) via system controller. Use Value: TTL-level compatibility ensures clean signal edges into display drivers; -40 °C to +125 °C rating supports battery-powered field equipment. |
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 |
|---|---|---|---|
| 74HCT157D,652 | SO16 package (SOT109-1); identical logic function and electrical specs; no DIP variant available. | Suitable for surface-mount designs requiring same performance but smaller footprint and reflow assembly. | Select when board space is constrained and through-hole mounting is not required. |
| SN74LS257N | Bipolar TTL technology; higher ICC (20 mA typical), slower propagation (25 ns), narrower VCC range (4.75–5.25 V). | Compatible only in legacy 5 V TTL systems with ample power budget and relaxed timing; not qualified beyond +70 °C. | Choose only for drop-in replacement in existing LS-based designs where power and temperature margins allow. |
Compared with 74HCT257N,652, the 74HCT157D,652 offers identical functionality in SO16 for modern SMT layouts, while SN74LS257N provides TTL-pin-compatible but higher-power, lower-temperature legacy support - neither is pin-compatible with the DIP-16 74HCT257N,652 due to differing package and pinout.
Availability
74HCT257N,652 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and legacy microcontroller bus expansion requiring stable component supply, long-term lifecycle assurance, and through-hole manufacturability.
Supply support for 74HCT257N,652 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, reliable logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT257N,652 belongs to Nexperia's 74HCT logic family, engineered specifically for TTL-compatible interfacing in 5 V systems demanding low power, high noise immunity, and extended temperature operation.
FAQ
What is the maximum supply voltage for 74HCT257N,652?
The absolute maximum supply voltage for 74HCT257N,652 is +7.0 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operating outside this range may cause unreliable logic behavior or accelerated aging. The 74HCT257N,652 is not rated for 3.3 V operation - use 74HC257 variants for lower-voltage systems.
Does 74HCT257N,652 support hot insertion or live bus swapping?
No, 74HCT257N,652 does not support hot insertion. Its absolute maximum ratings do not cover powered insertion scenarios, and the input clamping diodes are not designed for sustained current during live connection. Always power down the system before inserting or removing the 74HCT257N,652 from a live bus.
Can the select input (S) and output enable (OE) be driven directly from a 3.3 V microcontroller GPIO?
No - 74HCT257N,652 requires VIH ≥ 2.0 V for reliable HIGH recognition, but its input structure is TTL-compatible and optimized for 5 V logic swings. A 3.3 V GPIO may not meet the guaranteed VIH threshold across temperature and process variation. Use a level shifter or buffer to translate 3.3 V signals to 5 V before applying them to S or OE on the 74HCT257N,652.
What is the purpose of the clamp diodes on 74HCT257N,652 inputs?
The integrated input clamp diodes on 74HCT257N,652 allow safe interfacing with voltages exceeding VCC when used with external current-limiting resistors. They protect internal circuitry from overvoltage transients up to ±20 mA, enabling robust design in mixed-supply systems or noisy industrial environments where input spikes may occur.
Is 74HCT257N,652 suitable for automotive under-hood applications?
Yes - the 74HCT257N,652 is specified from -40 °C to +125 °C and meets JESD78 latch-up Class II Level B, making it suitable for non-safety-critical under-hood applications such as engine sensors, HVAC controls, and lighting modules. However, it is not AEC-Q100 qualified; for automotive safety systems, consult Nexperia's automotive-grade alternatives.
74HCT257N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HCT
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 6mA, 6mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
74HCT257N,652 FAQ
1.How can I place an order for 74HCT257N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT257N,652 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 74HCT257N,652 reliable?
The price and inventory of 74HCT257N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT257N,652 is usually 5 days.
3.What payment methods are accepted for 74HCT257N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT257N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT257N,652?
74HCT257N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT257N,652 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 74HCT257N,652?
For technical support, including 74HCT257N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT257N,652 requirements.
6.How does Aetrix verify that 74HCT257N,652 is sourced from the original manufacturer or authorized distributors?
All 74HCT257N,652 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 74HCT257N,652 meets industry standards.
7.What is the process for return or replacement of 74HCT257N,652?
All 74HCT257N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT257N,652, 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 74HCT257N,652 part is unused and in its original packaging.
Return procedure for 74HCT257N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT257N,652 Tags
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P3S0200GMX
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