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

Texas Instruments SN74S258N

Name: SN74S258N
Brand: Texas Instruments
SKU: SN74S258N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74S258N

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: -

Datasheet:: SN74S258N.pdf

Description:: MUX, S SERIES, 2 LINE INPUT TTL

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Product details

Overview

SN74S258N from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in a 16-pin PDIP package, operating across 0°C to 70°C, with TTL-compatible inputs and outputs, 20 mA output drive capability, and propagation delay of 11 ns typical at V_CC = 5 V. It enables digital signal routing in legacy industrial control logic and vintage test equipment.

For engineers reviewing the SN74S258N datasheet, SN74S258N pinout, SN74S258N application, or SN74S258N equivalent, this page delivers verified functional specifications, validated pin assignments, real-world use cases in discrete logic systems, and confirmed drop-in alternatives for design continuity and obsolescence mitigation.

Technical Context

The SN74S258N implements four independent 2:1 multiplexers sharing a common select (S) and enable (G̅) control line. Each channel selects between two data inputs (A_n, B_n) to drive one output (Y_n) based on S and active-low G̅ state.

It uses Schottky-clamped TTL circuitry for improved speed over standard LS variants, with guaranteed fan-out of 10 LS-TTL loads, input clamp diodes for transient protection, and complementary output structure supporting wired-AND configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Function	Quadruple 2-line to 1-line data selector/multiplexer - routes four parallel 2-input signals under shared control.
Logic Family	TTL-S (Schottky) - provides 11 ns typical propagation delay and higher noise immunity than standard TTL.
Supply Voltage	4.75 V to 5.25 V - requires tightly regulated +5 V rail; not tolerant of wider voltage ranges.
Operating Temperature	0°C to 70°C - commercial-grade rating; unsuitable for extended industrial or military environments.
Output Drive	20 mA sink / 0.4 mA source - supports direct interfacing with LS-TTL and standard TTL loads without buffers.
Propagation Delay	11 ns (typical), 15 ns (max) - enables reliable operation up to ~30 MHz in critical path timing.
Input Compatibility	LS-TTL and TTL - accepts standard logic thresholds; no level-shifting required when cascading with 74LS or 74xx families.

Pinout & Package

SN74S258N is supplied in a 16-pin plastic dual in-line package (PDIP-N), 0.300" wide, with standard through-hole mounting and JEDEC MS-001AC outline.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 9, 12	Data Input A	A₁–A₄: First input pair per multiplexer channel; high-impedance TTL-compatible.
2, 5, 10, 13	Data Input B	B₁–B₄: Second input pair per channel; electrically identical to A inputs.
3, 6, 11, 14	Output Y	Y₁–Y₄: Active-high selected output; capable of driving 10 LS-TTL loads.
7	GND	Ground reference for all internal circuitry and I/O.
8	V_CC	+5 V power supply; bypass capacitor recommended adjacent to pin.
15	Select (S)	Global 2:1 select control: S = LOW selects A inputs; S = HIGH selects B inputs.
16	Enable (G̅)	Active-low global enable: G̅ = LOW enables outputs; G̅ = HIGH forces all Y_n HIGH-Z.

Key Features

Feature	Design Value
Independent channel operation	Four fully isolated 2:1 muxes share only S and G̅ lines-enables parallel data routing without crosstalk.
High-speed Schottky architecture	11 ns typical t_pd improves throughput in synchronous logic chains versus LS variants (e.g., SN74LS258BN).
Standard TTL interface compatibility	Direct drop-in replacement for 74xx/74LS258 in existing designs without level-shifting or pull-up adjustments.
Wired-AND capability	Open-collector-like behavior via complementary outputs allows logical ANDing of multiple Y_n signals using external pull-up.
Robust input clamping	Integrated input diodes protect against ±0.5 V undershoot/overshoot-critical in noisy industrial backplanes.

Applications

Industrial PLC I/O Expansion	Legacy Test Equipment Signal Routing
Use Scenario: Expanding discrete input selection in programmable logic controller modules where space-constrained PCBs require minimal component count. IC Role / Device Role / Timing Role: Data selector enabling dynamic reconfiguration of sensor input channels under microcontroller command. Use Value: Reduces need for additional address decoders or FPGA logic; maintains deterministic 11 ns switching latency across all four channels.	Use Scenario: Routing calibration reference signals between multiple DUT interfaces in automated test fixtures built with TTL-based control logic. IC Role / Device Role / Timing Role: Multiplexer providing selectable signal paths for analog-to-digital front-end conditioning stages. Use Value: Eliminates manual jumper changes; ensures repeatable, software-controlled signal integrity with sub-15 ns timing skew.
Digital Audio Switching Matrix	Embedded System Boot Configuration
Use Scenario: Selecting between primary and backup audio data streams in vintage digital synthesizer architectures using discrete logic. IC Role / Device Role / Timing Role: Synchronous 2:1 data path selector synchronized to system clock edge for glitch-free transitions. Use Value: Prevents audible clicks during stream switching due to controlled output enable timing and low propagation uncertainty.	Use Scenario: Configuring boot memory mapping (ROM vs. EPROM) and peripheral enable states during power-on reset in 8-bit microcomputer systems. IC Role / Device Role / Timing Role: Hardware-configurable logic element determining initial address decoding and bus arbitration setup. Use Value: Enables field-reprogrammable boot modes without firmware update; supports hardware-based fail-safe recovery paths.

Industrial PLC I/O Expansion

Legacy Test Equipment Signal Routing

Use Scenario: Expanding discrete input selection in programmable logic controller modules where space-constrained PCBs require minimal component count.

IC Role / Device Role / Timing Role: Data selector enabling dynamic reconfiguration of sensor input channels under microcontroller command.

Use Value: Reduces need for additional address decoders or FPGA logic; maintains deterministic 11 ns switching latency across all four channels.

Use Scenario: Routing calibration reference signals between multiple DUT interfaces in automated test fixtures built with TTL-based control logic.

IC Role / Device Role / Timing Role: Multiplexer providing selectable signal paths for analog-to-digital front-end conditioning stages.

Use Value: Eliminates manual jumper changes; ensures repeatable, software-controlled signal integrity with sub-15 ns timing skew.

Digital Audio Switching Matrix

Embedded System Boot Configuration

Use Scenario: Selecting between primary and backup audio data streams in vintage digital synthesizer architectures using discrete logic.

IC Role / Device Role / Timing Role: Synchronous 2:1 data path selector synchronized to system clock edge for glitch-free transitions.

Use Value: Prevents audible clicks during stream switching due to controlled output enable timing and low propagation uncertainty.

Use Scenario: Configuring boot memory mapping (ROM vs. EPROM) and peripheral enable states during power-on reset in 8-bit microcomputer systems.

IC Role / Device Role / Timing Role: Hardware-configurable logic element determining initial address decoding and bus arbitration setup.

Use Value: Enables field-reprogrammable boot modes without firmware update; supports hardware-based fail-safe recovery paths.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2:1 multiplexer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS258BN	Slower propagation delay (22 ns typ), lower power consumption (20 mW avg), LS-TTL family.	Suitable for lower-speed, power-sensitive designs where 11 ns timing margin is unnecessary.	Choose SN74LS258BN when thermal budget or static power dominates over speed requirements.
SN74F258N	Fast TTL variant: 8 ns typ propagation, higher drive (20 mA sink/1 mA source), tighter V_CC tolerance (4.5–5.5 V).	Better suited for high-frequency clock distribution or dense logic arrays requiring minimal skew.	Select SN74F258N when system timing closure demands sub-10 ns delays and robust fan-out under marginal supply conditions.

Compared with SN74LS258BN and SN74F258N, SN74S258N delivers optimal balance of speed and compatibility in legacy TTL systems-faster than LS but more robustly compatible than F-family parts in mixed-sourcing environments.

Availability

SN74S258N is available at Aetrix Electronics and suitable for industrial control, legacy test equipment, and embedded system boot configuration requiring stable component supply and long-term obsolescence support.

Supply support for SN74S258N 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 aerospace heritage.

The SN74S258N belongs to TI's legacy TTL logic portfolio, designed specifically for high-reliability, discrete digital system integration where speed, noise immunity, and backward compatibility with 74xx families are essential.

FAQ

What is the maximum clock frequency supported by SN74S258N?

The SN74S258N does not operate on a clock signal-it is a combinational logic device. Its usable data rate depends on propagation delay (11 ns typical) and system setup/hold timing. In practice, it reliably handles asynchronous data switching up to approximately 30 MHz in well-designed PCB layouts with controlled trace lengths and proper decoupling.

Can SN74S258N be used as a level shifter between 3.3 V and 5 V logic domains?

No, SN74S258N is strictly a 5 V TTL device with V_CC = 4.75–5.25 V and input thresholds referenced to 5 V. It cannot accept 3.3 V logic levels reliably-inputs below 2.0 V may not register as valid LOW, and 3.3 V outputs driving its inputs risk marginal HIGH recognition. Use dedicated level translators like TXB0104 for 3.3 V ↔ 5 V interfacing.

Is SN74S258N pin-compatible with SN74LS258BN?

Yes, SN74S258N and SN74LS258BN share identical 16-pin PDIP packaging, pinout, and functional assignment. They are direct drop-in replacements at the board level-differences lie only in electrical performance (speed, power, noise margin) and internal transistor implementation.

Does SN74S258N support hot-swap or live-insertion?

No, SN74S258N lacks hot-swap protection circuitry. Applying power while signals are present-or removing it mid-operation-can cause latch-up or output contention. Always power-cycle the device with all inputs and outputs in high-impedance or defined states, and follow TI's recommended power sequencing guidelines for TTL logic.

What is the meaning of the "S" in SN74S258N?

The "S" in SN74S258N denotes Schottky TTL technology-using Schottky diodes to prevent transistor saturation, thereby reducing propagation delay and improving switching speed compared to standard (74) or low-power Schottky (74LS) variants. This distinguishes it from SN74LS258BN (LS-TTL) and SN74F258N (Fast TTL).

SN74S258N Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Type:: -

Circuit:: -

Independent Circuits:: -

Current - Output High, Low:: -

Voltage Supply Source:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

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SN74S258N FAQ

1.How can I place an order for SN74S258N through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74S258N 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 SN74S258N reliable?

The price and inventory of SN74S258N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74S258N is usually 5 days.

3.What payment methods are accepted for SN74S258N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74S258N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74S258N?

SN74S258N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74S258N 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 SN74S258N?

For technical support, including SN74S258N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74S258N requirements.

6.How does Aetrix verify that SN74S258N is sourced from the original manufacturer or authorized distributors?

All SN74S258N 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 SN74S258N meets industry standards.

7.What is the process for return or replacement of SN74S258N?

All SN74S258N units undergo pre-shipment inspection (PSI). If there is an issue with SN74S258N, 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 SN74S258N part is unused and in its original packaging.

Return procedure for SN74S258N:

1.Submit a request within 90 days.

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

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