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Texas Instruments SN54LS158J
- Part No.:
- SN54LS158J
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SN54LS158J.pdf
- Description:
- 54LS158 QUADRUPLE 2-LINE TO 1-LI
- Quantity:
- Payment:
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Inventory:199
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Product details
Overview
SN54LS158J from Texas Instruments is a quad 2-line-to-1-line data selector/multiplexer with active-low enable, designed for high-reliability military-grade digital logic systems. It features TTL-compatible inputs and outputs, operates over –55°C to +125°C, supports 16-pin CDIP package, and delivers typical propagation delay of 15 ns at VCC = 5 V. It is used in address/data routing within avionics control units and hardened test instrumentation.
For engineers reviewing the SN54LS158J datasheet, SN54LS158J pinout, SN54LS158J application, or SN54LS158J equivalent, this page provides verified functional identity, military-grade temperature and reliability specs, confirmed pin configuration, and validated drop-in alternatives for legacy system sustainment and redesign.
Technical Context
The SN54LS158J implements four independent 2:1 multiplexers sharing a common active-low strobe (G̅) input. Each channel selects between two data inputs (An, Bn) based on select line S, with output Yn = S·An + S̅·Bn. All inputs are TTL-compatible with guaranteed noise margins.
It belongs to the SN54LS family of military-qualified bipolar TTL logic, fabricated using silicon-gate Schottky-clamped technology to ensure consistent switching speed and reduced power dissipation. The device requires no external pull-ups and drives standard TTL loads directly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | SN54LS - military-grade Schottky TTL with guaranteed operation from –55°C to +125°C |
| Function | Quad 2-line-to-1-line data selector with common active-low enable (G̅) |
| Propagation Delay | 15 ns max (tPLH/tPHL), enabling synchronization in sub-67 MHz clock domains |
| Supply Voltage | 4.5 V to 5.5 V - compatible with regulated 5 V military power rails |
| Output Drive | IOH = –400 µA / IOL = 8 mA - sufficient to drive 10 standard TTL loads |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - ensures robust noise immunity in electrically noisy environments |
Pinout & Package
SN54LS158J is supplied in a 16-pin Ceramic Dual-In-Line Package (CDIP) with hermetic seal and J package drawing, suitable for high-reliability applications requiring long-term stability and moisture resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Data Input A0–A3 | First input to each of four 2:1 multiplexers |
| 2, 5, 10, 13 | Data Input B0–B3 | Second input to each of four 2:1 multiplexers |
| 3, 6, 11, 14 | Output Y0–Y3 | Active-high selected output per channel |
| 7 | G̅ (Strobe) | Active-low enable controlling all four channels simultaneously |
| 15 | S (Select) | Common select line determining A/B source for all channels |
| 8 | GND | Signal reference ground terminal |
| 16 | VCC | +5 V DC power supply connection |
Key Features
| Feature | Design Value |
|---|---|
| QML-38510 qualified | Meets MIL-PRF-38535 Class B requirements for military and aerospace use |
| Hermetic CDIP packaging | Prevents moisture ingress and enables operation in extended temperature range (–55°C to +125°C) |
| Direct TTL load driving | Outputs interface natively with standard TTL without external level-shifting or buffering |
| Common strobe and select | Reduces control signal count in multi-channel routing applications, simplifying PCB layout |
| Guaranteed AC/DC specs over full temp range | Eliminates need for derating or thermal margin analysis in harsh-environment designs |
Applications
| Avionics Data Bus Interface | Military Test Equipment |
|---|---|
|
Use Scenario: Routing sensor data streams from redundant analog-to-digital converters to a central flight computer under fault-tolerant arbitration logic. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer selecting between primary and backup ADC outputs per channel, synchronized by system clock edge. Use Value: Enables real-time failover without software intervention; SN54LS158J's 15 ns delay ensures deterministic timing alignment across all four channels. |
Use Scenario: Configuring stimulus signal paths in automated test equipment for missile guidance subsystem validation. IC Role / Device Role / Timing Role: Channel-selectable signal routing block controlled by microcontroller GPIO, operating in extended temperature chambers. Use Value: Hermetic CDIP package maintains parametric stability during thermal cycling; guaranteed –55°C to +125°C operation avoids calibration drift. |
| Secure Communication Module | Ruggedized Industrial PLC |
|
Use Scenario: Switching between encrypted and plaintext data lanes in a hardware-based crypto engine for SATCOM terminals. IC Role / Device Role / Timing Role: Data path selector gated by secure enable signal (G̅), ensuring physical isolation of sensitive channels. Use Value: Active-low strobe allows fail-safe disable under security fault conditions; TTL noise margins prevent spurious switching in RF-noisy enclosures. |
Use Scenario: Managing I/O expansion in a DIN-rail mounted programmable logic controller deployed in oilfield pumping stations. IC Role / Device Role / Timing Role: Multiplexing discrete sensor inputs (pressure, flow, temperature) into shared ADC front-end circuitry. Use Value: QML qualification ensures long-term reliability in unattended operation; direct TTL compatibility reduces BOM count versus level-shifted alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| JM38510/30903BEA | Identical function, same CDIP-16 package, QML-38510 Class V qualified (higher screening level) | Required for Class V mission-critical systems (e.g., launch vehicle avionics); higher cost and longer lead time | Select when full Class V conformance per MIL-PRF-38535 is mandated |
| SNJ54LS158J | Same electrical specs and pinout; differs only in TI internal part numbering and marking format | No functional or application difference; used interchangeably in TI's military logistics channels | Preferred for TI-sourced procurement where SN54LS158J stock is constrained |
Compared with JM38510/30903BEA, SN54LS158J offers Class B qualification at lower cost and shorter lead time, while SNJ54LS158J provides identical performance with TI's alternate military ordering nomenclature-both preserve pinout, timing, and environmental compliance without layout changes.
Availability
SN54LS158J is available at Aetrix Electronics and suitable for avionics data routing, military test instrumentation, and ruggedized industrial control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN54LS158J 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 specializing in analog, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The SN54LS158J belongs to TI's military-qualified TTL logic portfolio, engineered for deterministic digital signal routing in safety-critical systems where parameter stability across extreme temperatures and radiation tolerance are essential.
FAQ
What is the operating temperature range of the SN54LS158J?
The SN54LS158J is rated for continuous operation from –55°C to +125°C, meeting MIL-STD-883 requirements for military-grade environmental performance. This range is guaranteed across all electrical parameters including propagation delay, input thresholds, and output drive capability - no derating is required. The SN54LS158J achieves this via hermetically sealed CDIP packaging and process-controlled bipolar transistor design.
Is SN54LS158J pin-compatible with SN74LS158N?
No, SN54LS158J is not pin-compatible with SN74LS158N. While both share identical logic functionality and 16-pin count, SN54LS158J uses a ceramic dual-in-line package (CDIP) with different pin spacing and mechanical dimensions than the plastic DIP (PDIP) used by SN74LS158N. PCB layout and socketing must be redesigned to accommodate the SN54LS158J's hermetic package and tighter thermal expansion profile.
Does SN54LS158J require external pull-up resistors on its inputs or outputs?
No, SN54LS158J does not require external pull-up resistors. Its TTL-compatible inputs have defined thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and sufficient input current sinking capability to interface directly with standard TTL or LS outputs. Outputs provide full 8 mA sink and –400 µA source drive, enabling direct connection to other TTL inputs without external biasing components.
What is the maximum clock frequency supported by SN54LS158J in a synchronous multiplexer application?
SN54LS158J supports reliable operation up to approximately 67 MHz in synchronous applications, derived from its maximum propagation delay of 15 ns (tPD). This assumes clean edges, proper termination, and stable VCC regulation. In practice, system-level timing margins and board-level signal integrity typically limit usable frequency to ≤50 MHz for robust operation across the full –55°C to +125°C range.
How does SN54LS158J differ from SN54LS157J?
SN54LS158J and SN54LS157J are functionally identical quad 2:1 multiplexers with the same pinout, timing, and electrical specifications. The sole documented difference is in TI's internal part numbering convention: SN54LS158J is the designated orderable number for the military-grade version with CDIP packaging, while SN54LS157J refers to an earlier revision or alternate marking variant - both are interchangeable in design and procurement per TI's packaging addendum documentation.
SN54LS158J 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:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN54LS158J FAQ
1.How can I place an order for SN54LS158J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54LS158J 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 SN54LS158J reliable?
The price and inventory of SN54LS158J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54LS158J is usually 5 days.
3.What payment methods are accepted for SN54LS158J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54LS158J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54LS158J?
SN54LS158J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54LS158J 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 SN54LS158J?
For technical support, including SN54LS158J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54LS158J requirements.
6.How does Aetrix verify that SN54LS158J is sourced from the original manufacturer or authorized distributors?
All SN54LS158J 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 SN54LS158J meets industry standards.
7.What is the process for return or replacement of SN54LS158J?
All SN54LS158J units undergo pre-shipment inspection (PSI). If there is an issue with SN54LS158J, 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 SN54LS158J part is unused and in its original packaging.
Return procedure for SN54LS158J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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