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Texas Instruments SN74AS250ADWE4
- Part No.:
- SN74AS250ADWE4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AS250ADWE4.pdf
- Description:
- IC DATA GEN/MULTPL 1X16:1 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,779
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Product details
Overview
SN74AS250ADWE4 from Texas Instruments is a 16-channel analog multiplexer/decoder IC with 3-state inverting output (W), 4-bit binary address inputs (A–D), and active-low output-enable (OE). It operates at 4.5–5.5 V, delivers ±48 mA output drive, and features symmetrical propagation delays (tPLH/tPHL ≤ 8 ns at VCC = 5 V, CL = 50 pF) for glitch-minimized bus selection in TTL-compatible systems.
For engineers reviewing the SN74AS250ADWE4 datasheet, SN74AS250ADWE4 pinout, SN74AS250ADWE4 application, or SN74AS250ADWE4 equivalent, this device serves as a high-speed, low-glitch 1-of-16 data selector in legacy industrial control, test equipment, and parallel-to-serial conversion where precise timing, bus isolation, and TTL-level compatibility are required.
Technical Context
The SN74AS250ADWE4 implements full 4-bit binary decoding to select one of sixteen data inputs (E0–E15) onto a single inverting W output. Its internal logic ensures symmetrical propagation delay between rising and falling edges, reducing transient generation during switching transitions.
It integrates buffered 3-state bus driver inputs and an independent OE control that places W in high-impedance without affecting internal data latching-enabling cascaded n-line-to-1-line multiplexing while new input data is set up concurrently.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation within standard TTL power rails and compatibility with 5 V logic families. |
| Propagation Delay (tPLH/tPHL) | ≤ 8 ns - Enables high-speed data routing in systems requiring sub-10 ns channel switching (CL = 50 pF). |
| Output Drive (IOL/IOH) | 32 mA / −12 mA - Sufficient to directly drive multiple TTL loads or terminate unterminated buses without external buffers. |
| Input Voltage Thresholds | VIL = 0.8 V, VIH = 2.0 V - Matches standard TTL input sensitivity, eliminating level-shifting in mixed-logic designs. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded systems, instrumentation, and non-automotive industrial environments. |
| Output Enable Response | tPZL ≤ 9 ns, tPHZ ≤ 6 ns - Supports rapid bus arbitration and dynamic reconfiguration in time-critical control loops. |
Pinout & Package
SN74AS250ADWE4 is housed in a 24-pin plastic small-outline (DW) package with 300-mil width, gull-wing leads, and JEDEC MO-153AC compliance. Pin spacing is 0.050 inch (1.27 mm), body width 0.300 inch (7.62 mm), and total length 0.600 inch (15.24 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–4, 6–9, 11, 13–16, 18–21 | Data Inputs E0–E15 | 16 independent digital inputs selected via A–D address lines; no internal pull-up/down. |
| 5, 10, 12, 17 | Address Inputs A–D | Binary-coded selection lines (A = LSB, D = MSB); decoded internally to activate one Ei path. |
| 22 | Output Enable (OE) | Active-low control: OE = H forces W into high-Z; OE = L enables normal inverted output operation. |
| 23 | Inverting Output (W) | Complemented version of selected Ei; tri-statable; drives bus when OE = L. |
| 24, 10 | VCC / GND | Power supply pins; requires local 0.1 µF ceramic decoupling at each VCC pin per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical Propagation Delay | tPLH ≈ tPHL ≤ 8 ns - Minimizes pulse-width distortion and eliminates output glitches during address changes. |
| Buffered 3-State Bus Driver Inputs | Enables direct connection to shared data buses without contention; OE isolates W electrically from bus lines. |
| Full Binary Decoding Logic | Internally decodes A–D to select exactly one of 16 Ei paths - no external decode logic required for 1-of-16 routing. |
| High-Drive TTL-Compatible Outputs | IOL = 32 mA supports fan-out of ≥10 standard TTL loads; eliminates need for external line drivers in dense backplanes. |
| Independent OE Control | OE does not affect internal data latching - allows preloading next address/data while current output is disabled. |
Applications
| Boolean Function Generator | Parallel-to-Serial Converter |
|---|---|
Use Scenario: Implementing arbitrary 4-input combinational logic using programmable address lines and fixed Ei input patterns. IC Role / Device Role / Timing Role: Acts as a programmable logic array (PLA) core by mapping truth-table entries to E0–E15 inputs and selecting outputs via A–D. Use Value: Reduces gate count vs discrete logic; enables fast reconfiguration of logic functions without hardware change. |
Use Scenario: Converting 16-bit parallel data streams (e.g., ADC output or memory word) into serial bit sequences for UART or shift-register interfaces. IC Role / Device Role / Timing Role: Provides deterministic, clock-synchronized bit-by-bit output sequencing driven by counter-controlled A–D inputs. Use Value: Eliminates microcontroller overhead for bit-banging; achieves consistent 16-cycle serialization with <10 ns timing jitter. |
| Data Source Selector | Test Equipment Signal Routing |
Use Scenario: Dynamically choosing among 16 sensor inputs, calibration references, or signal sources in automated test systems. IC Role / Device Role / Timing Role: Functions as a digitally controlled analog/digital switch matrix with TTL-compatible control interface. Use Value: Enables single-instruction source switching with guaranteed glitch suppression and bus isolation during transitions. |
Use Scenario: Routing stimulus signals or measurement paths in benchtop ATE, boundary-scan controllers, or PCB functional testers. IC Role / Device Role / Timing Role: Serves as a precision channel selector with nanosecond-level enable/disable timing for synchronized test sequencing. Use Value: Supports sub-10 ns path reconfiguration critical for high-speed digital pattern generation and response capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS250N | Slower propagation (tPLH/tPHL ≤ 25 ns), lower drive (IOL = 8 mA), LS-TTL compatible thresholds (VIH = 2.0 V, VIL = 0.8 V same). | Acceptable in low-speed legacy systems where power consumption (<25 mW) and cost are prioritized over speed. | Choose SN74LS250N only if system timing budget exceeds 20 ns and bus loading is light. |
| CD74HC250E | CMOS technology: wider VCC range (2–6 V), lower ICC (<8 µA), but reduced drive (IOL = 4 mA), higher propagation (tPLH/tPHL ≤ 20 ns @ 4.5 V). | Suitable for battery-powered or mixed-voltage designs, but requires buffering for TTL bus driving. | Choose CD74HC250E when operating below 4.5 V or when ultra-low static power is mandatory. |
Compared with SN74AS250ADWE4, SN74LS250N trades speed and drive strength for lower cost and power, while CD74HC250E offers voltage flexibility and near-zero static current at the expense of bus-driving capability and timing performance-making SN74AS250ADWE4 the optimal choice for high-speed, high-drive 5 V TTL systems.
Availability
SN74AS250ADWE4 is available at Aetrix Electronics and suitable for industrial control panels, automated test equipment, and legacy instrumentation requiring stable component supply across extended production lifecycles.
Supply support for SN74AS250ADWE4 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 SN74AS250ADWE4 belongs to TI's advanced Schottky (AS) logic family, engineered for high-speed, low-glitch data routing in mission-critical commercial and industrial systems where TTL compatibility and nanosecond timing are essential.
FAQ
What is the maximum clock rate supported by SN74AS250ADWE4 for reliable 1-of-16 multiplexing?
The SN74AS250ADWE4 does not operate on a clock signal-it is combinatorial logic. Its maximum usable switching rate depends on propagation delay and setup/hold timing. With tPLH/tPHL ≤ 8 ns and address stability maintained for >1 ns before W transition, it supports effective data routing rates exceeding 100 MHz in pipelined configurations. The SN74AS250ADWE4 is specified for static address control, not synchronous clocking.
Does SN74AS250ADWE4 support hot-swapping or live insertion into a powered bus?
No, SN74AS250ADWE4 is not designed for hot-swap operation. Its absolute maximum ratings do not include live-insertion stress conditions, and the absence of bus-fault protection or slew-rate control means inserting it into an active 5 V bus risks latch-up or damage. Always power down the system before installing or removing the SN74AS250ADWE4.
Can SN74AS250ADWE4 be used to multiplex analog signals such as audio or sensor voltages?
No-SN74AS250ADWE4 is a digital TTL multiplexer with CMOS-compatible input thresholds but bipolar transistor output stages optimized for logic-level switching. It lacks rail-to-rail analog bandwidth, on-resistance matching, or break-before-make timing, making it unsuitable for analog signal routing. Use dedicated analog switches like TMUX6219 for such applications instead of SN74AS250ADWE4.
What is the purpose of the inverting output (W) in SN74AS250ADWE4, and can it be used non-inverted?
The W output of SN74AS250ADWE4 is inherently inverting: when Ei = HIGH, W = LOW, and vice versa. To obtain non-inverted output, a single external SN74AS04 inverter must be added. This inversion is part of the device's logic architecture and cannot be disabled. All timing parameters-including tPLH/tPHL-are specified for the W output path in SN74AS250ADWE4.
Is SN74AS250ADWE4 RoHS compliant, and what is its lead finish?
SN74AS250ADWE4 is not RoHS compliant. Per TI's packaging documentation, the DW package variant uses SnPb (tin-lead) lead finish and is exempt from RoHS Directive 2011/65/EU under Annex III exemption 7a for high-melting-temperature solder alloys. This makes SN74AS250ADWE4 suitable for legacy repair, military, and aerospace applications requiring Pb-based solderability-but incompatible with modern lead-free assembly processes unless special waivers apply.
SN74AS250ADWE4 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
SN74AS250ADWE4 FAQ
1.How can I place an order for SN74AS250ADWE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS250ADWE4 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 SN74AS250ADWE4 reliable?
The price and inventory of SN74AS250ADWE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS250ADWE4 is usually 5 days.
3.What payment methods are accepted for SN74AS250ADWE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS250ADWE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS250ADWE4?
SN74AS250ADWE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS250ADWE4 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 SN74AS250ADWE4?
For technical support, including SN74AS250ADWE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS250ADWE4 requirements.
6.How does Aetrix verify that SN74AS250ADWE4 is sourced from the original manufacturer or authorized distributors?
All SN74AS250ADWE4 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 SN74AS250ADWE4 meets industry standards.
7.What is the process for return or replacement of SN74AS250ADWE4?
All SN74AS250ADWE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS250ADWE4, 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 SN74AS250ADWE4 part is unused and in its original packaging.
Return procedure for SN74AS250ADWE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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