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

Texas Instruments SN74LS158DR

Name: SN74LS158DR
Brand: Texas Instruments
SKU: SN74LS158DR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74LS158DR

Manufacturer:: Texas Instruments

Category:: Signal Switches, Multiplexers, Decoders

Package:: 16-SOIC (0.154", 3.90mm Width)

Datasheet:: SN74LS158DR.pdf

Description:: IC MULTIPLEXER 4 X 2:1 16SOIC

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Product details

Overview

SN74LS158DR from Texas Instruments is a quad 2-line-to-1-line data selector/multiplexer in a 16-pin SOIC package, operating at 0°C to 70°C, with typical propagation delay of 15 ns and supply current of 19 mA at 5 V. It performs logic-level signal routing in TTL-compatible digital control systems such as address decoding in microprocessor peripherals.

For engineers reviewing the SN74LS158DR datasheet, SN74LS158DR pinout, SN74LS158DR application, or SN74LS158DR equivalent, key selection criteria include its active-low enable (G̅), complementary output (Y̅), single-supply 5 V operation, and compatibility with legacy LS-TTL logic families in industrial control and test equipment design.

Technical Context

The SN74LS158DR implements four independent 2:1 multiplexers sharing a common active-low strobe (G̅) input. Each channel selects between two data inputs (A and B) based on a select line (S), producing an inverted output (Y̅). All logic thresholds and timing adhere to standard LS-TTL specifications.

Its internal architecture uses bipolar transistor-transistor logic with Schottky clamping for speed optimization. The device supports wired-OR expansion via Y̅ outputs and requires no external biasing-fully compatible with SN74LS157, SN74LS158, and SN74LS158N variants in function and timing.

Key Specifications

Parameter	Value and Actual Design Meaning
Logic Family	LS-TTL: ensures interoperability with legacy 74LS-series components and predictable noise margins in mixed-logic systems.
Propagation Delay (t_pd)	15 ns max at V_CC = 5 V: enables reliable operation in synchronous bus arbitration up to ~30 MHz clock domains.
Supply Voltage (V_CC)	4.75 V to 5.25 V: matches standard TTL power rails and eliminates need for voltage regulation in 5 V systems.
Output Type	Active-low complementary (Y̅): allows direct connection to enable inputs of downstream LS devices without inverters.
Operating Temperature	0°C to 70°C: certified for commercial-grade embedded controllers, instrumentation, and PCB-mounted logic subsystems.
Package	SOIC (D) with 16 pins: surface-mount footprint compatible with automated assembly and IPC-7351 land patterns.
RoHS Compliance	Yes, NIPDAU lead finish: meets EU RoHS Directive 2011/65/EU for lead-free manufacturing and environmental compliance.

Pinout & Package

SN74LS158DR is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package, 7.5 mm wide, with 1.27 mm pitch and 2.00 mm max height per TI package drawing D016A.

Pin/Terminal	Circuit Role	Design Meaning
1 (G̅)	Active-low strobe enable	Disables all four multiplexers when high; required low for functional selection-used for hierarchical enable tree control.
2–3, 4–5, 10–11, 12–13 (A/B)	Data inputs (4 pairs)	Each pair feeds one 2:1 mux; A and B are non-inverting inputs-no internal inversion before selection.
6, 7, 8, 9 (S)	Select lines (4 independent)	Each controls its associated mux: S = 0 selects A, S = 1 selects B-no shared select bus; fully parallel operation.
14–15, 16, 1 (Y̅)	Inverted outputs (4)	Outputs are active-low and complementary to selected input-enables direct NAND/NOR logic integration.
16 (V_CC)	Positive supply	5 V nominal; decoupling capacitor (0.1 µF) recommended within 10 mm of pin for noise suppression.
8 (GND)	Ground reference	Common return for all logic and output stages-must be low-impedance connection to minimize ground bounce.

Key Features

Feature	Design Value
Quad independent 2:1 multiplexers	Four isolated channels allow simultaneous routing of separate data paths-ideal for multi-channel ADC/DAC interface selection.
Complementary (inverted) outputs	Eliminates need for external inverters when driving LS-TTL enable or reset inputs-reduces component count and board area.
Single active-low global enable (G̅)	Enables system-level power gating or mode switching-synchronizes all four muxes without additional control logic.
Standard LS-TTL electrical compatibility	Guaranteed VIH ≥ 2.0 V, VIL ≤ 0.8 V, and I_OH/I_OL drive strength match SN74LS00/LS04 families-ensures drop-in replacement in existing designs.
SOIC packaging with RoHS-compliant finish	NIPDAU termination supports lead-free reflow (Level-1-260°C-UNLIM) and automated optical inspection-reduces manufacturing risk.

Applications

Microprocessor Address Decoding	Industrial I/O Multiplexing
Use Scenario: Selecting between two memory-mapped peripheral address ranges in an 8-bit microcontroller system using A0–A15 bus lines. IC Role / Device Role / Timing Role: SN74LS158DR acts as a bank-select decoder, routing address bits to enable specific I/O registers or memory banks based on control signals. Use Value: Reduces glue logic count by consolidating four independent 2:1 selections into one IC-cuts PCB real estate and improves timing predictability vs discrete gates.	Use Scenario: Routing analog sensor inputs (temperature, pressure, flow) to a shared ADC channel in programmable logic controller (PLC) backplane. IC Role / Device Role / Timing Role: SN74LS158DR functions as a digitally controlled analog signal switch controller-its TTL outputs drive analog multiplexer enable lines. Use Value: Enables deterministic scan sequencing with sub-20 ns enable-to-output delay-critical for synchronized multi-sensor acquisition in closed-loop control.
Digital Test Equipment Signal Routing	Legacy Bus Arbitration Logic
Use Scenario: Switching between calibration reference voltages and DUT signals in automated test equipment (ATE) front-end modules. IC Role / Device Role / Timing Role: SN74LS158DR serves as a precision path selector under microcontroller command-outputs drive high-impedance buffer inputs. Use Value: Provides consistent 15 ns propagation delay across all four channels-ensures phase-aligned switching critical for time-domain measurement accuracy.	Use Scenario: Managing shared resource access among multiple DMA controllers on a vintage ISA bus architecture. IC Role / Device Role / Timing Role: SN74LS158DR implements priority-encoded bus grant logic-Y̅ outputs feed OR-tied grant lines with wired-AND arbitration. Use Value: Leverages native active-low outputs to directly form wired-OR grant trees-avoids level-shifting and reduces arbitration latency by >10 ns vs inverter-based solutions.

Microprocessor Address Decoding

Industrial I/O Multiplexing

Use Scenario: Selecting between two memory-mapped peripheral address ranges in an 8-bit microcontroller system using A0–A15 bus lines.

IC Role / Device Role / Timing Role: SN74LS158DR acts as a bank-select decoder, routing address bits to enable specific I/O registers or memory banks based on control signals.

Use Value: Reduces glue logic count by consolidating four independent 2:1 selections into one IC-cuts PCB real estate and improves timing predictability vs discrete gates.

Use Scenario: Routing analog sensor inputs (temperature, pressure, flow) to a shared ADC channel in programmable logic controller (PLC) backplane.

IC Role / Device Role / Timing Role: SN74LS158DR functions as a digitally controlled analog signal switch controller-its TTL outputs drive analog multiplexer enable lines.

Use Value: Enables deterministic scan sequencing with sub-20 ns enable-to-output delay-critical for synchronized multi-sensor acquisition in closed-loop control.

Digital Test Equipment Signal Routing

Legacy Bus Arbitration Logic

Use Scenario: Switching between calibration reference voltages and DUT signals in automated test equipment (ATE) front-end modules.

IC Role / Device Role / Timing Role: SN74LS158DR serves as a precision path selector under microcontroller command-outputs drive high-impedance buffer inputs.

Use Value: Provides consistent 15 ns propagation delay across all four channels-ensures phase-aligned switching critical for time-domain measurement accuracy.

Use Scenario: Managing shared resource access among multiple DMA controllers on a vintage ISA bus architecture.

IC Role / Device Role / Timing Role: SN74LS158DR implements priority-encoded bus grant logic-Y̅ outputs feed OR-tied grant lines with wired-AND arbitration.

Use Value: Leverages native active-low outputs to directly form wired-OR grant trees-avoids level-shifting and reduces arbitration latency by >10 ns vs inverter-based solutions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS157N	PDIP-16 package, same logic function and timing, but through-hole mounting and 0°C to 70°C rating.	Suitable for prototyping, repair, or legacy through-hole production-requires manual soldering or wave solder process.	Select SN74LS157N when board assembly uses through-hole technology or requires socket-based debugging.
SN74LS158NSR	SOP-16 package (NS), identical electrical specs, same RoHS/NIPDAU finish, but slightly larger body (8.45 mm A0 vs 6.5 mm for D).	Better thermal dissipation margin and higher mechanical robustness in vibration-prone environments-compatible with same land pattern family.	Choose SN74LS158NSR for high-reliability industrial deployments where SOP's enhanced creepage and mechanical stability are prioritized.

Compared with SN74LS157N and SN74LS158NSR, the SN74LS158DR offers optimal balance of automated assembly compatibility, compact SOIC footprint, and verified performance in volume commercial applications-making it the preferred choice for new SMT-based designs requiring LS-TTL multiplexing.

Availability

SN74LS158DR is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and legacy microprocessor peripheral interfacing requiring stable component supply and long-term manufacturability.

Supply support for SN74LS158DR 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 and embedded processing technologies with broad portfolio coverage across industrial, automotive, and consumer markets.

The SN74LS158DR belongs to TI's legacy 74LS logic family, engineered for backward compatibility, deterministic timing, and robust noise immunity in fixed-function digital systems deployed in harsh or mission-critical environments.

FAQ

What is the maximum clock frequency supported by SN74LS158DR?

The SN74LS158DR is not a clocked device-it has no internal clock and operates asynchronously. Its usable signal switching rate is governed by propagation delay (15 ns max) and system setup/hold timing. In practice, SN74LS158DR reliably supports data path selection in systems with clock edges spaced ≥30 ns apart, corresponding to effective toggle rates up to ~33 MHz in well-designed layouts with proper decoupling.

Does SN74LS158DR support 3.3 V logic levels?

No, SN74LS158DR is strictly a 5 V LS-TTL device. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and output drive characteristics are specified only for V_CC = 4.75–5.25 V. Interfacing with 3.3 V systems requires level-shifting circuitry-TI recommends SN74LVC4245 or discrete resistor-divider networks with validation per application conditions.

Can SN74LS158DR replace SN74LS157 in an existing design?

SN74LS158DR and SN74LS157 share identical pinout, logic function, and DC/AC specifications-both are quad 2:1 multiplexers with active-low enable and complementary outputs. SN74LS158DR is a direct functional and pin-compatible replacement for SN74LS157 in SOIC packages; no PCB or firmware changes are required when substituting SN74LS158DR for SN74LS157DR or SN74LS157NSR.

What is the power consumption of SN74LS158DR under typical operation?

At V_CC = 5 V and 25°C, SN74LS158DR draws 19 mA typical supply current (I_CC) with all outputs loaded. This includes quiescent current plus dynamic switching current. Total power dissipation remains below 100 mW under full-load conditions-well within SOIC package thermal limits, eliminating need for heatsinking in standard ambient environments.

Is SN74LS158DR suitable for automotive applications?

SN74LS158DR is rated for 0°C to 70°C operation and carries no AEC-Q200 qualification. It is intended for commercial-grade use only. For automotive applications requiring extended temperature range (–40°C to 125°C) or qualification, TI recommends the SN54LS158J (military-grade, –55°C to 125°C) or modern alternatives like SN74LV158A with AEC-Q100 Grade 2 certification-SN74LS158DR itself must not be deployed in safety-critical or under-hood automotive systems.

SN74LS158DR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74LS

Package/Case:: 16-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Multiplexer

Circuit:: 4 x 2:1

Independent Circuits:: 1

Current - Output High, Low:: 400µA, 8mA

Voltage Supply Source:: Single Supply

Voltage - Supply:: 4.75V ~ 5.25V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 16-SOIC

SN74LS158DR FAQ

1.How can I place an order for SN74LS158DR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74LS158DR 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 SN74LS158DR reliable?

The price and inventory of SN74LS158DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS158DR is usually 5 days.

3.What payment methods are accepted for SN74LS158DR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS158DR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74LS158DR?

SN74LS158DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74LS158DR 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 SN74LS158DR?

For technical support, including SN74LS158DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS158DR requirements.

6.How does Aetrix verify that SN74LS158DR is sourced from the original manufacturer or authorized distributors?

All SN74LS158DR 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 SN74LS158DR meets industry standards.

7.What is the process for return or replacement of SN74LS158DR?

All SN74LS158DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS158DR, 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 SN74LS158DR part is unused and in its original packaging.

Return procedure for SN74LS158DR:

1.Submit a request within 90 days.

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

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