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Texas Instruments SN74LS158NSR
- Part No.:
- SN74LS158NSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS158NSR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74LS158NSR from Texas Instruments is a quad 2-line-to-1-line data selector/multiplexer in a 16-pin SOP (NS) package, operating at 0°C to 70°C, with typical propagation delay of 15 ns and supply current of 19 mA at VCC = 5 V. It performs logic-level signal routing in TTL-compatible digital control systems such as address decoding and bus management.
For engineers reviewing the SN74LS158NSR datasheet, SN74LS158NSR pinout, SN74LS158NSR application, or SN74LS158NSR equivalent, key selection criteria include its 4-channel select-and-route capability, TTL input thresholds, guaranteed fan-out of 20 LS-TTL loads, and compatibility with legacy 74LS logic families in industrial control and test equipment designs.
Technical Context
The SN74LS158NSR implements four independent 2:1 multiplexers sharing common select (S) and enable (G̅) inputs. Each channel routes either I0 or I1 to its output Y based on S state when G̅ is low; all outputs go high-impedance when G̅ is high.
It uses bipolar Schottky TTL technology, delivering 15 ns typical propagation delay (tpd) from select or data input to output, 2.4 V minimum high-level output voltage (VOH) at IOH = –0.4 mA, and 0.5 V maximum low-level output voltage (VOL) at IOL = 8 mA - meeting standard LS-TTL interface specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL), ensuring interoperability with legacy LS-TTL systems without level-shifting. |
| Function | Quad 2-line-to-1-line data selector/multiplexer with active-low enable (G̅) and common select (S). |
| Propagation Delay | 15 ns typical (max 25 ns), enabling reliable operation up to ~20 MHz in synchronous control paths. |
| Supply Voltage | 4.75 V to 5.25 V - tightly regulated for stable noise margins in industrial power environments. |
| Output Drive | –0.4 mA (high), +8 mA (low); supports direct drive of 20 LS-TTL inputs without buffering. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems and instrumentation. |
| Package | SOP (NS), 16-pin, RoHS-compliant, NIPDAU lead finish, MSL Level-1, tape-and-reel (2000 pcs). |
Pinout & Package
SOP (NS) package: 16-pin small-outline plastic, 1.27 mm pitch, 8.45 mm × 10.55 mm body, 2.00 mm max height, pin 1 quadrant Q1 per TI tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G̅) | Active-low enable input | Disables all four outputs to high-impedance when high; required low for functional multiplexing. |
| 2 (I0A) | Data input A, channel 1 | First data source for multiplexer A; selected when S = 0 and G̅ = 0. |
| 3 (I1A) | Data input B, channel 1 | Second data source for multiplexer A; selected when S = 1 and G̅ = 0. |
| 4 (YA) | Output A | Inverted-logic output (active-high) of channel A; drives LS-TTL loads directly. |
| 5 (I0B) | Data input A, channel 2 | First data source for multiplexer B; shares S and G̅ with other channels. |
| 6 (I1B) | Data input B, channel 2 | Second data source for multiplexer B; enables synchronized 4-channel selection. |
| 7 (YB) | Output B | Active-high output of channel B; electrically identical to YA in drive and timing. |
| 8 (GND) | Ground reference | Power return path; must be low-inductance connection to minimize switching noise. |
| 9 (YC) | Output C | Third active-high multiplexer output; supports parallel routing of three independent signals. |
| 10 (I0C) | Data input A, channel 3 | First input for channel C; allows uniform 2:1 selection across all four channels. |
| 11 (I1C) | Data input B, channel 3 | Second input for channel C; maintains consistent pin mapping across all channels. |
| 12 (S) | Common select input | Global 1-bit control determining which input (I0x or I1x) passes to each Yx. |
| 13 (YD) | Output D | Fourth active-high output; completes full quad-mux functionality in single package. |
| 14 (I0D) | Data input A, channel 4 | First input for final channel; enables compact implementation of 4× 2:1 routing. |
| 15 (I1D) | Data input B, channel 4 | Second input for final channel; completes pin-symmetric layout for manufacturability. |
| 16 (VCC) | Positive supply | +5 V nominal supply; decoupling capacitor (0.1 µF) required adjacent to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2:1 multiplexer function | Four independent channels share one select and one enable line - reduces control logic and PCB routing vs discrete solutions. |
| TTL-compatible input thresholds | VIH = 2.0 V min, VIL = 0.8 V max - ensures robust interfacing with standard 5 V microcontrollers and logic families. |
| High fan-out capability | Drives 20 LS-TTL loads per output - eliminates need for buffer stages in dense logic arrays. |
| Guaranteed high-impedance outputs | All Y outputs enter defined high-Z state when G̅ = high - enables safe bus sharing and hot-swap compatibility. |
| Commercial temperature range | 0°C to 70°C operation with tested parametric limits - suitable for office, lab, and factory-floor embedded systems. |
Applications
| Address Decoding | Bus Multiplexing |
|---|---|
|
Use Scenario: Selecting between two memory banks or peripheral address spaces in an 8-bit microcontroller system. IC Role / Device Role / Timing Role: Quad 2:1 selector routes A0–A3 lines under CPU control to determine active address region. Use Value: Reduces external gate count by consolidating four independent address-bit switches into one IC with shared S/G̅ control. |
Use Scenario: Sharing a single data bus among multiple sensors or ADCs in a modular test instrument. IC Role / Device Role / Timing Role: Routes sensor output data to MCU data lines using synchronized channel selection. Use Value: Enables time-multiplexed acquisition without bus contention, leveraging guaranteed high-Z disable state. |
| Signal Routing in Control Logic | Legacy System Interface |
|
Use Scenario: Dynamically reconfiguring feedback paths in a programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: Selects between primary and redundant sensor inputs for fault-tolerant monitoring. Use Value: Provides deterministic 15 ns switching latency - critical for real-time loop timing budgets. |
Use Scenario: Interfacing modern FPGA-based controllers with legacy TTL-based display drivers or keypad encoders. IC Role / Device Role / Timing Role: Translates between different signal sources while preserving LS-TTL voltage levels and drive strength. Use Value: Eliminates need for level translators or discrete transistor buffers due to native LS-TTL compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-line-to-1-line multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS157NSR | Identical pinout and function but with separate enable per pair (G̅AB, G̅CD) instead of single global G̅. | Allows independent enable control of two channel pairs - useful when partial mux activation is required. | Select SN74LS157NSR if staggered channel enable is needed; SN74LS158NSR is preferred for fully synchronized 4-channel selection. |
| SN74HC157DR | CMOS version (74HC), 2 V–6 V supply, lower ICC (8 µA typ), higher tpd (19 ns typ), 3.3 V/5 V tolerant inputs. | Enables mixed-voltage systems and battery-powered designs where power efficiency outweighs speed loss. | Choose SN74HC157DR for low-power or wide-VCC applications; SN74LS158NSR remains optimal for pure 5 V TTL environments requiring LS drive strength. |
Compared with SN74LS157NSR and SN74HC157DR, the SN74LS158NSR offers unified enable control and superior LS-TTL drive - making it the most suitable choice for legacy 5 V systems requiring deterministic, high-fan-out signal routing without voltage translation.
Availability
SN74LS158NSR is available at Aetrix Electronics and suitable for industrial control panels, automated test equipment, and legacy instrumentation requiring stable component supply, long-term obsolescence mitigation, and RoHS-compliant manufacturing support.
Supply support for SN74LS158NSR 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 industrial, automotive, and communications product portfolios.
The SN74LS158NSR belongs to TI's legacy 74LS logic family, designed specifically for backward-compatible upgrades and maintenance of 5 V TTL-based digital systems deployed in aerospace, defense, and industrial infrastructure.
FAQ
What is the maximum clock frequency supported by SN74LS158NSR?
The SN74LS158NSR is not a clocked device - it is a combinational multiplexer with no internal clock. Its usable signal switching rate depends on propagation delay (15 ns typical) and system setup/hold timing. In practice, it reliably handles asynchronous data rates up to approximately 20 MHz in well-designed 5 V TTL circuits, provided input transitions meet LS-TTL slew rate requirements. The SN74LS158NSR does not specify a clock frequency rating because it operates transparently on input changes.
Does SN74LS158NSR support 3.3 V logic inputs?
No, the SN74LS158NSR is a standard 5 V TTL device with input thresholds defined for VCC = 5 V: VIL ≤ 0.8 V and VIH ≥ 2.0 V. While a 3.3 V CMOS high may exceed 2.0 V and register as logic high, it falls below the recommended 2.4 V minimum for noise margin robustness. Direct 3.3 V interfacing is not guaranteed and risks marginal operation; level-shifting or a 74LVC-series alternative is advised for mixed-voltage systems. The SN74LS158NSR requires 4.75–5.25 V supply for specified performance.
How does SN74LS158NSR differ from SN74LS157NSR in pin configuration?
The SN74LS158NSR and SN74LS157NSR share identical 16-pin SOP (NS) packaging and pin spacing, but differ in internal enable architecture and pin assignment. SN74LS158NSR uses a single active-low enable (G̅) on Pin 1 controlling all four channels, whereas SN74LS157NSR splits enable into two pins: G̅AB (Pin 1) and G̅CD (Pin 15). This makes them not pin-compatible - direct substitution would cause incorrect enable behavior. Both require the same VCC (Pin 16) and GND (Pin 8) connections.
Is SN74LS158NSR suitable for high-reliability aerospace applications?
The SN74LS158NSR is a commercial-grade (0°C to 70°C) component and is not screened or certified for aerospace use. For high-reliability applications, TI offers military-grade variants such as SNJ54LS158J (–55°C to 125°C, QML-qualified) in CDIP packages. The SN74LS158NSR lacks radiation tolerance, extended temperature validation, and burn-in testing required for flight hardware. Use only the SN74LS158NSR in ground-based, non-safety-critical commercial systems unless fully derated and validated per customer-specific reliability protocols.
Can SN74LS158NSR outputs drive LEDs directly?
Yes - each output of the SN74LS158NSR can sink up to 8 mA (VOL ≤ 0.5 V) and source up to 0.4 mA (VOH ≥ 2.4 V), making it capable of directly driving low-current indicator LEDs in active-low configurations (LED anode to VCC, cathode to Yx). For active-high LED drive, an external pull-up or transistor buffer is required due to limited sourcing capability. Always include a series current-limiting resistor (e.g., 330 Ω for ~10 mA at 5 V) to protect both the SN74LS158NSR and the LED.
SN74LS158NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 16-SOIC (0.209", 5.30mm 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-SO
SN74LS158NSR FAQ
1.How can I place an order for SN74LS158NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS158NSR 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 SN74LS158NSR reliable?
The price and inventory of SN74LS158NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS158NSR is usually 5 days.
3.What payment methods are accepted for SN74LS158NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS158NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS158NSR?
SN74LS158NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS158NSR 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 SN74LS158NSR?
For technical support, including SN74LS158NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS158NSR requirements.
6.How does Aetrix verify that SN74LS158NSR is sourced from the original manufacturer or authorized distributors?
All SN74LS158NSR 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 SN74LS158NSR meets industry standards.
7.What is the process for return or replacement of SN74LS158NSR?
All SN74LS158NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS158NSR, 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 SN74LS158NSR part is unused and in its original packaging.
Return procedure for SN74LS158NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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