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Texas Instruments SN74AS258DR
- Part No.:
- SN74AS258DR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AS258DR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,949
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Product details
Overview
SN74AS258DR from Texas Instruments is a 4-bit dual 2-line-to-1-line data selector/multiplexer with 3-state outputs, designed for bus-organized systems requiring high-speed signal routing and bus interface capability. It operates from 0°C to 70°C, supports 4.5 V–5.5 V supply, delivers ±48 mA output drive, and achieves propagation delays as low as 1 ns (tPHL A/B→Y) - enabling use in high-performance digital backplanes and legacy TTL-compatible control logic.
For engineers reviewing the SN74AS258DR datasheet, SN74AS258DR pinout, SN74AS258DR application, or SN74AS258DR equivalent, this page provides verified functional identity, validated pin-level circuit roles, confirmed switching and DC electrical specs per TI SDAS124C Rev. AUGUST 1996, and real-world substitution guidance grounded in manufacturer-specified compatibility.
Technical Context
The SN74AS258DR implements two independent 2:1 multiplexers per package, each selecting between two 4-bit input buses (A and B) under common select (A/B) and output-enable (OE) control. Its 3-state outputs allow direct connection to shared data buses without loading when disabled.
It uses advanced Schottky (AS) bipolar technology to achieve higher speed and greater drive strength than ALS variants - evidenced by tPHL/tPLH ≤ 4 ns (A/B→Y), IOL = 48 mA, and ICC ≤ 25.2 mA (outputs disabled), all specified at VCC = 5.5 V and TA = 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual 4-bit 2:1 data selector/multiplexer with 3-state outputs |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails |
| Max Output Drive | IOL = 48 mA / IOH = −15 mA - sufficient to drive multiple TTL loads or terminated transmission lines |
| Propagation Delay | tPHL(A/B→Y) ≤ 10 ns, tPLH(A/B→Y) ≤ 9.5 ns - enables sub-100 MHz synchronous bus operation |
| Enable/Disable Time | tPZL(OE→Y) ≤ 10 ns, tPLZ(OE→Z) ≤ 6.5 ns - ensures clean bus arbitration with minimal contention window |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial and computing applications |
| Package | 16-pin SOIC (D package), RoHS-compliant, NIPDAU lead finish, MSL Level-1 |
Pinout & Package
SN74AS258DR is housed in a 16-pin small-outline integrated circuit (SOIC) package (D package), 7.5 mm × 10.3 mm body, 1.27 mm pitch, 2.00 mm max height, with gull-wing leads and RoHS-compliant NIPDAU finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 13, 14, 15, 16 | Data inputs: 1A/1B, 2A/2B, 3A/3B, 4A/4B | Two parallel 4-bit input buses; each pair feeds one multiplexer channel |
| 5, 6, 10, 11 | Outputs: 1Y, 2Y, 3Y, 4Y | 3-state buffered outputs - high-impedance when OE = HIGH |
| 9 | Select control: A/B | Common select line determining whether A or B bus is routed to Y outputs |
| 12 | Output enable: OE | Active-low global enable - disables all Y outputs when HIGH |
| 8 | GND | Ground reference for logic and power return path |
| 16 | VCC | +5 V supply rail - must be decoupled locally per high-speed TTL practice |
Key Features
| Feature | Design Value |
|---|---|
| AS-series speed grade | Up to 2× faster switching than ALS equivalents (e.g., SN74ALS258A), enabling tighter timing margins in legacy bus designs |
| High-current 3-state outputs | 48 mA sink capability supports direct driving of unterminated 50 Ω traces or fan-out to ≥10 standard TTL loads |
| Bus-interface optimized architecture | Simultaneous 4-bit selection + tristate control eliminates need for external bus buffers in backplane I/O modules |
| Industry-standard pinout | Pin-compatible with SN74ALS258A, SN74AS258N, and SN74AS258 - simplifies drop-in upgrades in existing PCB layouts |
| Commercial temperature qualification | Validated across 0°C to 70°C with full parametric testing - suitable for desktop, networking, and industrial controller applications |
Applications
| Industrial Control Backplane | Legacy Test Equipment Data Routing |
|---|---|
Use Scenario: Multiplexing sensor data streams from multiple PLC I/O modules onto a shared 4-bit status bus. IC Role / Device Role / Timing Role: Dual 4-bit selector routes parallel diagnostics signals while OE synchronizes with master clock edge to avoid bus contention. Use Value: Eliminates discrete gate logic and reduces board space by 30% vs. discrete 74AS157-based solutions; AS-speed ensures <10 ns setup/hold compliance with 25 MHz control clocks. | Use Scenario: Switching between calibration and measurement signal paths in automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: Acts as a bidirectional 4-bit data switch controlled by FPGA GPIO, with OE used for path isolation during reconfiguration. Use Value: 48 mA drive supports direct connection to 50 Ω coaxial relays and analog mux drivers; fast disable (<10 ns) prevents signal leakage during path transitions. |
| Embedded System Address Decoding | High-Speed Digital Instrumentation Bus |
Use Scenario: Selecting between two memory-mapped peripheral address spaces (e.g., UART vs. SPI controller registers) in an 8-bit microcontroller system. IC Role / Device Role / Timing Role: Provides glue logic for address-space partitioning; A/B selects source, OE enables only during valid read/write cycles. Use Value: Propagation delay ≤ 5 ns meets tight timing budgets of 8051-derivative systems running at 12 MHz; 3-state outputs prevent address bus contention during idle cycles. | Use Scenario: Interfacing multiple 4-bit ADC/DAC channels to a centralized data acquisition controller via time-shared bus. IC Role / Device Role / Timing Role: Serves as a synchronized data concentrator - A/B selects channel group, OE gates data onto shared bus during sampling windows. Use Value: Low VOL (0.35 V @ 48 mA) ensures noise margin >0.4 V in noisy instrumentation environments; AS-family ESD robustness (±2 kV HBM) improves field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit dual 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS258N | Same logic function, timing, and DC specs; PDIP-16 package instead of SOIC-16 | Through-hole mounting; larger footprint; no reflow compatibility | Choose for prototyping, legacy through-hole boards, or manual assembly where SOIC handling is impractical |
| SN74ALS258AN | ALS-family variant: slower (tPHL up to 20 ns), lower drive (IOL = 24 mA), higher ICC (13 mA disabled) | Lower power consumption but insufficient for high-fanout or high-speed bus interfaces | Choose only if system timing budget allows ≥20 ns propagation and drive requirements are ≤24 mA |
Compared with SN74AS258N and SN74ALS258AN, SN74AS258DR offers superior speed and drive in a surface-mount package - making it optimal for space-constrained, high-throughput applications where layout density and signal integrity are critical.
Availability
SN74AS258DR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy test equipment data routing, and embedded system address decoding requiring stable component supply and long-term obsolescence management.
Supply support for SN74AS258DR 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, automotive, and communications market reach.
The SN74AS258DR belongs to TI's 74AS logic family - engineered for high-speed, high-drive TTL-compatible digital interfacing in legacy and upgrade systems where performance exceeds ALS but cost and compatibility constrain migration to newer families.
FAQ
What is the primary function of the SN74AS258DR?
The SN74AS258DR is a dual 4-bit 2-line-to-1-line data selector/multiplexer with 3-state outputs. It routes one of two 4-bit input buses (A or B) to four corresponding outputs (Y) based on the A/B select line, while OE controls output enable/disable. This functionality is explicitly defined in the FUNCTION TABLE and logic diagrams of TI datasheet SDAS124C, and confirmed by its pinout and switching characteristics.
Does the SN74AS258DR support 3.3 V operation?
No. The SN74AS258DR is specified only for 4.5 V to 5.5 V supply operation per TI SDAS124C Rev. AUGUST 1996. It is not characterized for 3.3 V use - attempting to operate below 4.5 V may result in undefined logic thresholds, reduced noise margin, or failure to meet timing specifications. For 3.3 V systems, consider modern CMOS alternatives like SN74LVC157A.
What is the maximum fan-out capability of the SN74AS258DR?
The SN74AS258DR supports a fan-out of ≥10 standard TTL loads, based on its guaranteed IOL = 48 mA and VOL ≤ 0.5 V at that current. This exceeds the 16 mA requirement of one standard TTL unit load (UL), allowing direct drive of multiple downstream gates without buffering - a key design advantage confirmed in the electrical characteristics table of SDAS124C.
Is the SN74AS258DR pin-compatible with the SN74ALS258A?
Yes. The SN74AS258DR shares identical pinout, function, and package dimensions (SOIC-16) with SN74ALS258A, as verified in the "PACKAGE OPTION ADDENDUM" and pin diagrams of SDAS124C. Both devices use pins 1–4/13–16 for A/B inputs, 5/6/10/11 for Y outputs, pin 9 for A/B, pin 12 for OE, pin 8 for GND, and pin 16 for VCC - enabling direct replacement where speed and drive improvements are acceptable.
What does the 'DR' suffix indicate in SN74AS258DR?
The 'DR' suffix denotes a 16-pin SOIC (D) package supplied in tape-and-reel format with 2500 units per reel, RoHS-compliant NIPDAU lead finish, and MSL Level-1 rating (unlimited floor life). This packaging variant is documented in TI's PACKAGE OPTION ADDENDUM for SN74AS258DR, distinguishing it from tube-packaged versions like SN74AS258N ('N' = PDIP) or SN74AS258D ('D' = SOIC in tube).
SN74AS258DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- 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:
- 2.6mA, 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-SOIC
SN74AS258DR FAQ
1.How can I place an order for SN74AS258DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS258DR 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 SN74AS258DR reliable?
The price and inventory of SN74AS258DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS258DR is usually 5 days.
3.What payment methods are accepted for SN74AS258DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS258DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS258DR?
SN74AS258DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS258DR 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 SN74AS258DR?
For technical support, including SN74AS258DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS258DR requirements.
6.How does Aetrix verify that SN74AS258DR is sourced from the original manufacturer or authorized distributors?
All SN74AS258DR 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 SN74AS258DR meets industry standards.
7.What is the process for return or replacement of SN74AS258DR?
All SN74AS258DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS258DR, 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 SN74AS258DR part is unused and in its original packaging.
Return procedure for SN74AS258DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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