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Texas Instruments SN74AS250ADWG4
- Part No.:
- SN74AS250ADWG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS250ADWG4.pdf
- Description:
- IC DATA GEN/MULTPL 1X16:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,708
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Product details
Overview
SN74AS250ADWG4 from Texas Instruments is a 4-line-to-1-line 16-channel TTL multiplexer with inverting W output, buffered 3-state bus driver inputs, symmetrical propagation delay (2–8 ns), and OE-controlled high-impedance output state. It operates at 4.5–5.5 V over 0°C to 70°C and is used in parallel-to-serial conversion and Boolean function generation in legacy industrial control logic systems.
For engineers reviewing the SN74AS250ADWG4 datasheet, SN74AS250ADWG4 pinout, SN74AS250ADWG4 application, or SN74AS250ADWG4 equivalent, key selection criteria include its 16-input selection capability, 3-state output enable timing (tPZL = 9 ns max), low-level input voltage threshold (VIL = 0.8 V), and compatibility with standard 5-V TTL logic families in space-constrained DIP-24 and SOIC-24 footprints.
Technical Context
The SN74AS250ADWG4 implements full binary decoding of four select lines (A, B, C, D) to route one of sixteen data inputs (E0–E15) to an inverting W output. Its internal architecture includes symmetrical propagation paths for rising/falling edges, minimizing output transients during switching.
It features a buffered output-enable (OE) input that places W in high-impedance without affecting internal data latching-enabling cascaded n-line-to-1-line multiplexing. The device maintains functional integrity while outputs are disabled, allowing new input data setup during bus contention avoidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard 5-V TTL supply tolerances. |
| Propagation Delay tPLH/tPHL | 2–8 ns (max) - enables high-speed data routing in synchronous logic systems up to ~100 MHz effective throughput. |
| Output Drive IOL/IOH | 48 mA sink / −15 mA source - supports direct interfacing with multiple TTL loads without external buffers. |
| Input Voltage Thresholds | VIL = 0.8 V, VIH = 2.0 V - guarantees noise margin compliance with legacy TTL logic families. |
| 3-State Enable Timing | tPZL = 9 ns, tPHZ = 6 ns - allows precise bus arbitration timing in shared-data-path architectures. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and instrumentation applications. |
| Package | SOIC-24 (DW) - surface-mount footprint compatible with automated assembly and legacy board redesigns. |
Pinout & Package
SN74AS250ADWG4 is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), measuring 7.50 mm × 15.40 mm with 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise from top-left when viewed from the top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 16, 17, 18, 19, 20, 21, 22, 23 | Data Inputs E0–E15 | 16 independent TTL-compatible data sources selected via A/B/C/D; no internal pull-ups or pull-downs. |
| 9 | Output Enable (OE) | Active-low control: OE = H forces W into high-Z; OE = L enables normal inverted multiplexed output. |
| 10 | Inverted Output (W) | Single-ended, 3-state, inverting output reflecting selected Ei; drives TTL loads directly. |
| 11, 12, 13, 14 | Select Inputs A, B, C, D | Binary address lines determining which Ei is routed to W; decoded internally with no external logic required. |
| 15 | GND | Power ground reference for all internal logic and output stages. |
| 24 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor recommended within 1 cm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical Propagation Delay | Identical tPLH and tPHL (2–8 ns) minimizes duty-cycle distortion in clocked data routing paths. |
| Buffered 3-State Bus Driver Inputs | Enables direct connection of up to 16 data sources to E0–E15 without signal degradation or loading effects. |
| OE-Controlled High-Impedance Output | W enters high-Z state within 9 ns of OE assertion, supporting hot-swap and multi-master bus sharing. |
| Full Binary Decoding Logic | Internal decoder eliminates need for external logic gates to implement 1-of-16 selection. |
| Inverting Output Architecture | W provides active-low representation of selected input, simplifying interface with negative-logic control systems. |
Applications
| Boolean Function Generator | Parallel-to-Serial Converter |
|---|---|
|
Use Scenario: Implementing arbitrary 4-variable logic functions using programmable input wiring and fixed select lines. IC Role / Device Role / Timing Role: Configurable logic element mapping truth-table entries to E0–E15; A/B/C/D serve as function address inputs. Use Value: Reduces gate count versus discrete NAND/NOR implementations; supports real-time reconfiguration via input wiring changes. |
Use Scenario: Converting 16-bit parallel data streams (e.g., from microprocessor data bus) into time-multiplexed serial output. IC Role / Device Role / Timing Role: Data selector synchronized to clock-driven A/B/C/D counter; W delivers time-division-multiplexed bits. Use Value: Eliminates need for shift registers or FPGA-based serialization in cost-sensitive industrial controllers. |
| Data Source Selector | Legacy System Bus Arbitration |
|
Use Scenario: Selecting among 16 sensor inputs (e.g., thermocouples, encoders) for analog-to-digital conversion in test equipment. IC Role / Device Role / Timing Role: Analog front-end multiplexer control interface; E0–E15 driven by buffered sensor outputs. Use Value: Provides deterministic, glitch-free channel switching with sub-10 ns enable/disable transitions. |
Use Scenario: Managing shared memory or peripheral access across multiple CPU modules in vintage industrial backplanes. IC Role / Device Role / Timing Role: Bus isolation element enabling OE-controlled release of W onto common data bus. Use Value: Prevents bus contention during module handoff; high-Z state leakage < ±50 µA avoids false logic levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel TTL multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS250AN | Same logic function and electrical specs, but in 24-pin PDIP (NT) package instead of SOIC-24. | Preferred for through-hole prototyping or legacy board repair where SOIC footprint is unavailable. | Select SN74AS250AN only if manual soldering or socket-based testing is required. |
| SN74F250N | F-family version: higher power consumption (ICC = 60 mA), slower propagation (tPLH = 12 ns), lower drive (IOL = 20 mA). | Suitable for non-critical timing paths where AS-speed and drive strength are not required. | Choose SN74F250N only when cost is primary constraint and performance margins allow 50% speed reduction. |
Compared with SN74AS250ADWG4, SN74AS250AN offers identical functionality in through-hole format for legacy compatibility, while SN74F250N trades speed and drive for lower cost and broader availability in obsolete-stock channels-neither is pin-compatible due to differing package types and thermal characteristics.
Availability
SN74AS250ADWG4 is available at Aetrix Electronics and suitable for industrial control systems, legacy test equipment upgrades, and aerospace avionics spares requiring stable component supply with long-term traceability and RoHS-compliant sourcing.
Supply support for SN74AS250ADWG4 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
Texas Instruments is a U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic ICs with broad industrial and military qualification heritage.
The SN74AS250ADWG4 belongs to TI's advanced Schottky (AS) TTL logic family, designed for high-speed, low-glitch data routing in mission-critical control and instrumentation systems where reliability under temperature stress matters.
FAQ
What is the maximum operating frequency supported by the SN74AS250ADWG4?
The SN74AS250ADWG4 does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤ 8 ns) and enable/disable times (tPZL ≤ 9 ns) support reliable operation in systems with data update rates up to approximately 100 MHz. Actual usable frequency depends on system-level timing margins, load capacitance, and PCB layout; design validation requires worst-case timing analysis per the SN74AS250ADWG4 datasheet's switching characteristics table.
Does the SN74AS250ADWG4 support cascading with other multiplexers?
Yes, the SN74AS250ADWG4 supports cascading via its buffered output-enable (OE) input. When OE is asserted, the W output enters high-impedance without disrupting internal decoding-allowing multiple SN74AS250ADWG4 devices to share a common bus. Cascaded configurations require external logic to coordinate A/B/C/D addressing across units, as the device lacks built-in cascade enable or carry-out signals.
Is the SN74AS250ADWG4 pin-compatible with the SN74LS250?
No, the SN74AS250ADWG4 is not pin-compatible with the SN74LS250. While both are 16-input multiplexers in 24-pin packages, the SN74LS250 uses a different pinout: its select inputs (A–D) and data inputs (E0–E15) occupy distinct positions, and it lacks the dedicated OE pin found on the SN74AS250ADWG4. Direct replacement would require PCB layout revision and signal routing changes.
What is the meaning of "G4" in the SN74AS250ADWG4 part number?
The "G4" suffix in SN74AS250ADWG4 indicates TI's green packaging standard: lead-free terminations, halogen-free molding compound, and RoHS compliance per EU Directive 2011/65/EU. It does not affect electrical performance or pinout-SN74AS250ADWG4 is functionally identical to SN74AS250ADW but meets modern environmental requirements for industrial and export-bound designs.
Can the SN74AS250ADWG4 operate with a 3.3-V supply?
No, the SN74AS250ADWG4 is specified only for 4.5–5.5 V operation. Applying 3.3 V violates its recommended operating conditions and results in undefined behavior: input thresholds (VIH = 2.0 V, VIL = 0.8 V) may not be met reliably, output drive strength collapses, and propagation delays increase unpredictably. For 3.3-V systems, consider logic-level translators or modern CMOS equivalents like SN74LV138A with appropriate interface buffering.
SN74AS250ADWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Data Generator/Multiplexer
- Circuit:
- 1 x 16:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 15mA, 48mA
- 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:
- 24-SOIC
SN74AS250ADWG4 FAQ
1.How can I place an order for SN74AS250ADWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS250ADWG4 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 SN74AS250ADWG4 reliable?
The price and inventory of SN74AS250ADWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS250ADWG4 is usually 5 days.
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Once your SN74AS250ADWG4 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 SN74AS250ADWG4?
For technical support, including SN74AS250ADWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS250ADWG4 requirements.
6.How does Aetrix verify that SN74AS250ADWG4 is sourced from the original manufacturer or authorized distributors?
All SN74AS250ADWG4 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 SN74AS250ADWG4 meets industry standards.
7.What is the process for return or replacement of SN74AS250ADWG4?
All SN74AS250ADWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS250ADWG4, 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 SN74AS250ADWG4 part is unused and in its original packaging.
Return procedure for SN74AS250ADWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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