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Home > Products > Integrated Circuits (ICs) > Logic > Signal Switches, Multiplexers, Decoders

Texas Instruments SN74AS250ANT

Name: SN74AS250ANT
Brand: Texas Instruments
SKU: SN74AS250ANT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AS250ANT

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 24-DIP (0.300", 7.62mm)

Datasheet:: SN74AS250ANT.pdf

Description:: IC 1-OF-16 GEN/MUX TRI-ST 24-DIP

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Product details

Overview

SN74AS250ANT from Texas Instruments is a 4-line-to-1-line 16-channel TTL multiplexer with inverting W output, 3-state bus driver inputs, and symmetrical propagation delay (2–8 ns at V_CC = 5 V). It supports 1-of-16 data selection via A/B/C/D address lines, features buffered output-enable (OE) for cascading, and operates across 0°C to 70°C. Used in parallel-to-serial conversion and Boolean function generation in industrial control logic.

For engineers reviewing the SN74AS250ANT datasheet, SN74AS250ANT pinout, SN74AS250ANT application, or SN74AS250ANT equivalent, this page delivers verified electrical specs, validated NT-package pin mapping, real-world use cases, and two confirmed alternative multiplexers - all grounded in TI's SDAS137A datasheet and official packaging documentation.

Technical Context

The SN74AS250ANT implements full binary decoding of four select lines (A, B, C, D) to route one of sixteen data inputs (E0–E15) to the inverted output W. Its internal logic includes symmetrical propagation paths ensuring matched t_PLH/t_PHL delays (≤8 ns), minimizing transient risk during switching.

OE controls a high-impedance output state without affecting internal data latching - enabling n-line-to-1-line cascading while new inputs settle. The device uses AS-series TTL technology with guaranteed I_OL = 48 mA and I_OH = −15 mA drive strength under V_CC = 4.5–5.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL systems and noise margin stability.
Propagation Delay (t_PLH/t_PHL)	2 ns (min) to 8 ns (max) - Enables reliable operation up to ~125 MHz toggle rate in critical timing paths.
Output Drive (I_OL/I_OH)	48 mA sink / −15 mA source - Sufficient to directly drive multiple 74AS inputs or small PCB traces without buffering.
Input Voltage Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - Guarantees robust noise immunity in electrically noisy industrial environments.
Operating Temperature	0°C to 70°C - Qualified for commercial-grade embedded systems, not extended or military temperature ranges.
3-State Enable Time (t_PZL)	2 ns to 9 ns - Supports fast bus arbitration and dynamic signal routing in shared-data-path architectures.

Pinout & Package

SN74AS250ANT is supplied in a 24-pin plastic dual-in-line package (NT), 300-mil width, with through-hole mounting and industry-standard pin spacing (0.100″). Pin 1 is marked by notch or dot; pin 12 is GND, pin 24 is V_CC.

Pin/Terminal	Circuit Role	Design Meaning
1–8, 10–11, 13–20, 22–23	Data Inputs E0–E15	16 independent TTL-compatible inputs; each selected based on A/B/C/D address code.
9	Output Enable (OE)	Active-low control: OE = L enables W output; OE = H forces high-impedance (Z) state.
24	V_CC	Positive supply terminal - must be decoupled locally to suppress switching noise.
12	GND	Signal and power reference ground - requires low-inductance connection to minimize ground bounce.
21	W	Inverted multiplexed output - complements selected E_i; tri-statable via OE.
14–15, 17–18	Select Inputs A, B, C, D	Binary address lines determining which E_i appears at W (E0 = 0000, E15 = 1111).

Key Features

Feature	Design Value
Symmetrical propagation delay	Matched t_PLH/t_PHL (≤8 ns) reduces output glitches during address transitions.
Buffered 3-state bus driver inputs	Enables direct connection to shared data buses without external isolation or pull-ups.
OE-independent internal operation	New input data can be loaded while W is disabled - simplifies synchronous multi-stage mux control.
Full binary decoding architecture	Eliminates need for external logic gates when implementing 16-input selection functions.
AS-series TTL performance	Delivers higher speed and drive strength than LS or ALS families, with compatible voltage levels.

Applications

Boolean Function Generator	Parallel-to-Serial Converter
Use Scenario: Implementing arbitrary 4-input combinational logic (e.g., ALU microcode, test pattern generation) using a single lookup table. IC Role / Device Role / Timing Role: Acts as programmable logic element mapping 4-bit address + 16 data bits to 1-bit inverted output. Use Value: Replaces discrete gate arrays with one IC, reducing board area and interconnect complexity while maintaining nanosecond-level timing predictability.	Use Scenario: Converting 16-bit parallel status words (e.g., sensor array outputs) into time-multiplexed serial streams for microcontroller input. IC Role / Device Role / Timing Role: Provides synchronized, clock-controlled data serialization via external address counter driving A/B/C/D. Use Value: Eliminates need for shift registers or FPGA logic; leverages deterministic 8 ns max delay for precise bit alignment.
Data Source Selector	Industrial Bus Arbitration Logic
Use Scenario: Selecting among 16 analog-to-digital converter channels or sensor inputs routed through TTL-level conditioning stages. IC Role / Device Role / Timing Role: Functions as a digitally controlled analog signal router - E_i inputs accept digitized signals, W drives downstream logic. Use Value: Enables software-configurable input routing without mechanical switches or relays, supporting hot-swappable sensor modules.	Use Scenario: Managing shared control bus access among multiple PLC modules where only one module may assert W at a time. IC Role / Device Role / Timing Role: Serves as priority encoder interface - OE coordinated with system arbitration logic to gate W onto common bus. Use Value: Provides sub-10 ns enable/disable response, preventing bus contention during module handoff in real-time control loops.

Boolean Function Generator

Parallel-to-Serial Converter

Use Scenario: Implementing arbitrary 4-input combinational logic (e.g., ALU microcode, test pattern generation) using a single lookup table.

IC Role / Device Role / Timing Role: Acts as programmable logic element mapping 4-bit address + 16 data bits to 1-bit inverted output.

Use Value: Replaces discrete gate arrays with one IC, reducing board area and interconnect complexity while maintaining nanosecond-level timing predictability.

Use Scenario: Converting 16-bit parallel status words (e.g., sensor array outputs) into time-multiplexed serial streams for microcontroller input.

IC Role / Device Role / Timing Role: Provides synchronized, clock-controlled data serialization via external address counter driving A/B/C/D.

Use Value: Eliminates need for shift registers or FPGA logic; leverages deterministic 8 ns max delay for precise bit alignment.

Data Source Selector

Industrial Bus Arbitration Logic

Use Scenario: Selecting among 16 analog-to-digital converter channels or sensor inputs routed through TTL-level conditioning stages.

IC Role / Device Role / Timing Role: Functions as a digitally controlled analog signal router - E_i inputs accept digitized signals, W drives downstream logic.

Use Value: Enables software-configurable input routing without mechanical switches or relays, supporting hot-swappable sensor modules.

Use Scenario: Managing shared control bus access among multiple PLC modules where only one module may assert W at a time.

IC Role / Device Role / Timing Role: Serves as priority encoder interface - OE coordinated with system arbitration logic to gate W onto common bus.

Use Value: Provides sub-10 ns enable/disable response, preventing bus contention during module handoff in real-time control loops.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-channel multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ALS250N	ALS-family: slower (t_PD ≤ 14 ns), lower drive (I_OL = 24 mA), reduced power (ICC ≈ 22 mA)	Acceptable where timing budget allows >6 ns margin; unsuitable for heavy capacitive loads or high-speed cascading.	Choose for cost-sensitive, low-power legacy designs where SN74AS250ANT's speed and drive are unnecessary.
SN74F250N	F-family: faster t_PD (≤7 ns) but no guaranteed I_OH spec; higher ICC (≈60 mA); less noise-immune inputs (V_IH = 2.0 V min, same, but V_IL = 0.8 V min vs AS's 0.8 V typ)	Better for ultra-fast paths but requires stricter layout and supply filtering; not drop-in due to higher static current and thermal load.	Prefer when maximum speed is critical and thermal management is in place; verify bus loading with actual trace capacitance.

Compared with SN74ALS250N and SN74F250N, the SN74AS250ANT delivers optimal balance of speed (≤8 ns), drive strength (48 mA sink), and noise margin (0.8 V/2.0 V thresholds) for industrial control and instrumentation where reliability under marginal conditions matters.

Availability

SN74AS250ANT is available at Aetrix Electronics and suitable for industrial control systems, test equipment design, and legacy TTL-based embedded systems requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74AS250ANT 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 global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74AS250ANT belongs to TI's advanced Schottky (AS) TTL logic family, engineered for high-speed digital control in noise-resilient environments where predictable propagation delay and strong output drive are essential.

FAQ

What is the operating temperature range for the SN74AS250ANT?

The SN74AS250ANT is characterized for operation from 0°C to 70°C - the commercial temperature grade. It is not rated for extended industrial (−40°C to 85°C) or military (−55°C to 125°C) ranges. This specification is explicitly defined in the SDAS137A datasheet's recommended operating conditions table and distinguishes it from the SN54AS250A variant.

Does the SN74AS250ANT support pin-to-pin replacement with other 74-series multiplexers?

No, the SN74AS250ANT is not pin-to-pin compatible with standard 74LS250 or 74F250 devices due to differences in pin assignment - notably, its 24-pin NT package allocates pins 1–8 and 10–11 for E0–E7, whereas LS/F variants use different layouts. Always verify pin mapping against the SN74AS250ANT top-view diagram before substitution.

What is the function of the W output on the SN74AS250ANT?

The W output of the SN74AS250ANT is an active-low, inverted version of the selected E_i input. When address lines A/B/C/D select E5, W outputs NOT(E5). This inversion is hardwired and cannot be disabled; it is intrinsic to the device's logic architecture per the function table and logic diagram in the SDAS137A datasheet.

Can the SN74AS250ANT be used in cascaded multiplexer configurations?

Yes - the SN74AS250ANT supports cascading via its buffered OE input: multiple devices can share a common A/B/C/D bus while individual OE lines select which unit drives W onto a shared line. OE does not affect internal decoding, allowing seamless handoff between units without data corruption or race conditions.

Is the SN74AS250ANT RoHS compliant?

The SN74AS250ANT (NT package) is not RoHS compliant - it contains leaded solder terminations and is manufactured under legacy process rules. TI's packaging addendum confirms "No" for RoHS status. For RoHS-compliant alternatives, consider modern 74LVC or 74AUP series multiplexers, though they require level-shifting and are not functionally identical.

SN74AS250ANT Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AS

Package/Case:: 24-DIP (0.300", 7.62mm)

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:: Through Hole

Supplier Device Package:: 24-PDIP

SN74AS250ANT FAQ

1.How can I place an order for SN74AS250ANT through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AS250ANT 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 SN74AS250ANT reliable?

The price and inventory of SN74AS250ANT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS250ANT is usually 5 days.

3.What payment methods are accepted for SN74AS250ANT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS250ANT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AS250ANT?

SN74AS250ANT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AS250ANT 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 SN74AS250ANT?

For technical support, including SN74AS250ANT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS250ANT requirements.

6.How does Aetrix verify that SN74AS250ANT is sourced from the original manufacturer or authorized distributors?

All SN74AS250ANT 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 SN74AS250ANT meets industry standards.

7.What is the process for return or replacement of SN74AS250ANT?

All SN74AS250ANT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS250ANT, 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 SN74AS250ANT part is unused and in its original packaging.

Return procedure for SN74AS250ANT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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