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NXP Semiconductors N74F257AD,623
- Part No.:
- N74F257AD,623
- Manufacturer:
- NXP Semiconductors
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
N74F257AD,623.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,746
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Product details
Overview
N74F257AD,623 from Philips Semiconductors is a quad 2-line to 1-line non-inverting multiplexer with 3-state outputs in a 16-pin SO package (SOT109-1). It selects four parallel data bits from two input sources using a common Select (S) line, enables bus sharing via active-low Output Enable (OE), and operates at 5V with 4.3ns typical propagation delay and industrial temperature range support (–40°C to +85°C).
For engineers reviewing the N74F257AD,623 datasheet, N74F257AD,623 pinout, N74F257AD,623 application, or N74F257AD,623 equivalent, key selection criteria include its 3-state bus interface capability, non-inverting logic path, S/OE dual-control architecture, and compatibility with FAST TTL load standards (1.0 U.L. inputs, 150/33 U.L. outputs).
Technical Context
The N74F257AD,623 implements four independent 2:1 multiplexers sharing one Select (S) input and one Output Enable (OE) input. Each multiplexer routes either I0n or I1n to Yn based on S level, with true (non-inverted) output polarity. OE asserts high-impedance state when high, enabling wired-OR or shared-bus configurations.
Its AC performance is characterized by 4.3ns typical tPLH/tPHL (I0/I1→Y), 6.0ns typical tPLH/tPHL (S→Y), and 4.5ns typical tPZH/tPZL (OE→Y), all measured at VCC = 5.0V, CL = 50pF, RL = 500Ω, Tamb = +25°C. DC operation supports VIH ≥ 2.0V, VIL ≤ 0.8V, VOH ≥ 2.7V (IOH = –3mA), VOL ≤ 0.50V (IOL = 24mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Quad 2:1 non-inverting multiplexer with 3-state outputs |
| Supply Voltage | 4.5V–5.5V - compatible with standard 5V TTL systems |
| Propagation Delay | 4.3ns typical (I0/I1→Y) - enables high-speed data routing in fast control paths |
| Output Drive | 24mA sink / 3mA source - sufficient for driving multiple FAST TTL loads |
| Operating Temperature | –40°C to +85°C - qualified for industrial environment deployment |
| Input Loading | 1.0 FAST unit load (20µA/0.6mA) - ensures predictable fan-out without external buffering |
| Output Loading | 150/33 FAST unit load (3.0mA/20mA) - supports direct connection to 150 FAST TTL inputs in high state |
Pinout & Package
Package: 16-pin plastic small outline (SO), body width 3.9 mm, SOT109-1 footprint, RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low Output Enable | Drives all Y outputs into high-impedance state when high; must be low for normal data routing |
| 2 (I0a) | Data Input A, Channel 0 | Selects Ya output when S = low; tied to first source word bit |
| 3 (I1a) | Data Input A, Channel 1 | Selects Ya output when S = high; tied to second source word bit |
| 4 (Ya) | Output A | Non-inverted output of channel A; 3-state controlled by OE and S |
| 5 (I0b) | Data Input B, Channel 0 | Selects Yb output when S = low; second bit of first source word |
| 6 (I1b) | Data Input B, Channel 1 | Selects Yb output when S = high; second bit of second source word |
| 7 (Yb) | Output B | Non-inverted output of channel B; electrically isolated when OE = high |
| 8 (GND) | Ground | Reference for all input thresholds and output voltage levels |
| 9 (I0c) | Data Input C, Channel 0 | Selects Yc output when S = low; third bit of first source word |
| 10 (I1c) | Data Input C, Channel 1 | Selects Yc output when S = high; third bit of second source word |
| 11 (Yc) | Output C | Non-inverted output of channel C; shares OE/S control with other channels |
| 12 (I0d) | Data Input D, Channel 0 | Selects Yd output when S = low; fourth bit of first source word |
| 13 (I1d) | Data Input D, Channel 1 | Selects Yd output when S = high; fourth bit of second source word |
| 14 (Yd) | Output D | Non-inverted output of channel D; completes 4-bit parallel multiplexing |
| 15 (S) | Common Select | Global 2:1 selector for all four channels; low = I0n, high = I1n |
| 16 (VCC) | Positive Supply | +5V power rail; decoupling capacitor required near pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Non-inverting data path | Preserves signal polarity across all four channels - eliminates need for external inverters in true-data routing |
| 3-State outputs with common OE | Enables multi-device bus arbitration using single enable control - reduces PCB routing complexity |
| Industrial temperature range | Validated operation from –40°C to +85°C - suitable for embedded controllers in harsh environments |
| FAST TTL-compatible loading | 1.0 U.L. inputs and 150/33 U.L. outputs - interoperable with legacy 74F logic families without level-shifting |
| Low propagation skew | Matched delays across all four channels (≤0.5ns max deviation) - maintains 4-bit data integrity in synchronous paths |
Applications
| Microprocessor Data Bus Selection | Test Equipment Signal Routing |
|---|---|
Use Scenario: Selecting between two 4-bit register banks (e.g., accumulator vs. temporary storage) during ALU operations in an 8-bit microcontroller system. IC Role / Device Role / Timing Role: Quad multiplexer providing synchronized 4-bit data path selection under CPU control via S and OE lines. Use Value: Eliminates discrete gate-based selection logic, reducing component count and propagation delay in critical timing paths. | Use Scenario: Dynamically routing stimulus signals from two calibration sources to a DUT's input pins in automated test equipment. IC Role / Device Role / Timing Role: 4-channel signal switch enabling rapid reconfiguration of test vectors without mechanical relays. Use Value: Achieves sub-10ns switching latency and repeatable impedance matching - critical for high-fidelity analog/digital stimulus delivery. |
| Industrial PLC I/O Multiplexing | Digital Audio Sample Switching |
Use Scenario: Consolidating sensor readings from redundant analog input modules onto a single ADC interface in programmable logic controllers. IC Role / Device Role / Timing Role: Fault-tolerant data selector that isolates failed channels via OE while maintaining continuity on healthy ones. Use Value: Enables hot-swap-capable I/O backplanes with no interruption to active measurement channels during module replacement. | Use Scenario: Switching between left/right stereo audio sample streams in digital mixing consoles before DAC conversion. IC Role / Device Role / Timing Role: Glitch-free 4-bit parallel selector synchronizing with audio clock edges to prevent pop/click artifacts. Use Value: Delivers <100ps inter-channel skew - preserves phase coherence across stereo pairs during real-time mixing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74F257N | DIP-16 package (SOT38-4); identical electrical specs and pinout; commercial temp range only (0°C to +70°C) | Limited to lab, prototyping, or non-industrial environments due to narrower temperature rating | Select when board space allows through-hole mounting and ambient conditions remain within commercial range. |
| 74ACT257SCX | Advanced CMOS (ACT) family; 3.3V/5V tolerant inputs; lower ICC (4mA typical); faster tPLH (3.5ns typical) | Requires careful VCC decoupling and may need input level adaptation for legacy 74F systems | Select when upgrading from 74F for lower power or higher speed, and system supports ACT-level noise margins. |
Compared with SN74F257N and 74ACT257SCX, the N74F257AD,623 uniquely combines industrial temperature qualification, SO surface-mount packaging, and full 74F-family compatibility - making it optimal for volume-manufactured industrial control boards where reliability and assembly efficiency are prioritized over marginal speed gains.
Availability
N74F257AD,623 is available at Aetrix Electronics and suitable for industrial control systems, automated test equipment, and microprocessor peripheral interfaces requiring stable component supply, long-term lifecycle assurance, and guaranteed SO-package availability.
Supply support for N74F257AD,623 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
Philips Semiconductors (now NXP Semiconductors) was a leading European semiconductor manufacturer known for robust logic families, automotive ICs, and RF solutions before its semiconductor division was acquired by NXP in 2006.
The 74F257A product line was designed for high-speed TTL-compatible digital systems requiring reliable 4-bit data routing with 3-state bus interface capability - targeting industrial automation, instrumentation, and legacy computing infrastructure.
FAQ
What is the operating voltage range for the N74F257AD,623?
The N74F257AD,623 operates over a supply voltage range of 4.5V to 5.5V, fully compliant with standard 5V ±10% TTL systems. This range ensures stable functionality across variations in power supply regulation and board-level noise, and is validated across the full industrial temperature range (–40°C to +85°C). The N74F257AD,623 does not support 3.3V operation.
Does the N74F257AD,623 support hot-swapping or live insertion?
The N74F257AD,623 is not rated for hot-swapping. Its absolute maximum ratings specify VCC and input voltages up to +7.0V, but no built-in protection against supply sequencing or I/O contention during insertion. Safe operation requires power to be stable and OE held high (outputs disabled) before applying input signals. The N74F257AD,623 must be powered and initialized prior to enabling data routing.
How does the Output Enable (OE) pin function on the N74F257AD,623?
The OE pin on the N74F257AD,623 is active-low: when OE is high, all four outputs (Ya–Yd) enter high-impedance state regardless of S or input levels; when OE is low, outputs respond normally to S and selected inputs. This allows multiple N74F257AD,623 devices to share a common bus without contention, provided only one has OE low at any time.
Can the N74F257AD,623 be used with mixed-voltage systems (e.g., 3.3V logic inputs)?
No - the N74F257AD,623 is a 5V-only device. Its input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V) and output drive levels are specified for 5V operation. Driving inputs with 3.3V logic may result in marginal or unreliable switching, especially over temperature and voltage extremes. Interfacing with 3.3V systems requires level translation. The N74F257AD,623 has no 3.3V-tolerant input structure.
What is the maximum capacitive load the N74F257AD,623 can drive reliably?
The N74F257AD,623 is characterized for CL = 50pF in AC specifications, with propagation delays and transition times guaranteed under that condition. While outputs can physically drive higher capacitance, exceeding 50pF degrades tPLH/tPHL and increases rise/fall times beyond datasheet limits. For loads >50pF, buffer stages or reduced edge rates are recommended. The N74F257AD,623 output stage is not optimized for heavy capacitive loading.
N74F257AD,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 3mA, 24mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
N74F257AD,623 FAQ
1.How can I place an order for N74F257AD,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F257AD,623 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 N74F257AD,623 reliable?
The price and inventory of N74F257AD,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F257AD,623 is usually 5 days.
3.What payment methods are accepted for N74F257AD,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for N74F257AD,623 transactions.
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4.How is shipping managed for N74F257AD,623?
N74F257AD,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F257AD,623 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 N74F257AD,623?
For technical support, including N74F257AD,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F257AD,623 requirements.
6.How does Aetrix verify that N74F257AD,623 is sourced from the original manufacturer or authorized distributors?
All N74F257AD,623 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 N74F257AD,623 meets industry standards.
7.What is the process for return or replacement of N74F257AD,623?
All N74F257AD,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F257AD,623, 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 N74F257AD,623 part is unused and in its original packaging.
Return procedure for N74F257AD,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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