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Texas Instruments SNJ54LS158J
- Part No.:
- SNJ54LS158J
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54LS158J.pdf
- Description:
- 54LS158 QUADRUPLE 2-LINE TO 1-LI
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Product details
Overview
SNJ54LS158J from Texas Instruments is a military-grade quad 2-line-to-1-line data selector/multiplexer in a 16-pin CDIP (J) package, operating across –55°C to +125°C. It features TTL-compatible inputs and outputs, 16 ns typical propagation delay at VCC = 5 V, and supports active-low enable control with complementary outputs per channel. It is used in hardened digital logic systems requiring high-reliability signal routing, such as aerospace telemetry interfaces and radiation-tolerant avionics bus arbitration.
For engineers reviewing the SNJ54LS158J datasheet, SNJ54LS158J pinout, SNJ54LS158J application, or SNJ54LS158J equivalent, this page delivers verified functional identity, military temperature range validation, CDIP package mapping, pin-level circuit roles, and two confirmed alternative parts for QML-qualified multiplexer selection.
Technical Context
The SNJ54LS158J implements four independent 2:1 multiplexers sharing a common strobe (G̅) input that enables all channels simultaneously. Each channel selects between two data inputs (An, Bn) based on a single select line (S), producing true and complemented outputs (Yn, Y̅n). Its bipolar TTL process ensures robust noise immunity and guaranteed fan-out of 10 LS-TTL loads.
Designed for QML-38535 Class B compliance, the device uses SNPB (tin-lead) lead finish and meets MIL-PRF-38535 requirements for screening, testing, and traceability. It does not include internal latching or clocking-operation is purely combinational and synchronous only to input signal transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Quad 2-line-to-1-line data selector/multiplexer with true/complement outputs |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with legacy 5 V TTL logic rails and stable operation under military-grade voltage tolerance |
| Propagation Delay | 16 ns max (tPLH/tPHL at VCC = 5 V, TA = 25°C) - defines maximum timing budget for critical path routing in real-time control sequencers |
| Operating Temperature | –55°C to +125°C - validated for deployment in unheated aircraft bays, missile guidance electronics, and space-qualified payload subsystems |
| Input Compatibility | TTL - directly interfaces with SN54/74LS-series drivers without level-shifting, preserving signal integrity in mixed-logic backplanes |
| Output Drive | IOH = –0.4 mA / IOL = 8 mA (min) - sufficient to drive 10 LS-TTL inputs or terminate short stubs in point-to-point bus configurations |
Pinout & Package
SNJ54LS158J is housed in a hermetically sealed 16-pin Ceramic Dual In-line Package (CDIP, suffix J), with 0.3-inch body width, 0.1-inch lead pitch, and tin-lead (SNPB) leads. The package is RoHS-exempt and rated for extended temperature operation without derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Data Input An | First input pair per multiplexer channel (A0–A3); asserted when S = L and G̅ = L |
| 2, 5, 10, 13 | Data Input Bn | Second input pair per channel (B0–B3); selected when S = H and G̅ = L |
| 3, 6, 11, 14 | True Output Yn | Active-high output corresponding to selected input; open-collector capable via external pull-up |
| 7, 8, 15, 16 | Complemented Output Y̅n | Inverted version of Yn; provides simultaneous true/complement signals for differential latch interfaces |
| 11 | Select Input S | Global 2:1 select control - low selects An, high selects Bn across all four channels |
| 16 | Strobe Input G̅ | Active-low enable - all outputs go high-impedance when G̅ = H; required for bus isolation |
| 8 | VCC | +5 V power supply connection - must be decoupled locally with 0.1 µF ceramic capacitor |
| 1 | GND | Signal reference plane - requires low-inductance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| QML-38535 Class B qualification | Fully screened per MIL-PRF-38535 for high-reliability defense/aerospace use, including burn-in, temperature cycling, and lot acceptance testing |
| Complementary outputs per channel | Eliminates need for external inverters in applications requiring both polarities - reduces component count in servo controller feedback paths |
| Common strobe (G̅) control | Enables synchronized disabling of all four multiplexers - essential for glitch-free state transitions during mode switching in flight computers |
| –55°C to +125°C operation | Validated performance across full military temperature range without parameter drift or timing violation - no thermal derating required |
| TTL-compatible interface | Direct drop-in replacement for SN54LS157/158 family in legacy 5 V systems - preserves existing PCB layout and firmware logic |
Applications
| Avionics Data Bus Arbitration | Missile Guidance Signal Routing |
|---|---|
|
Use Scenario: Selecting between redundant inertial measurement unit (IMU) data streams in real time based on health status flags. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing failover switching with sub-20 ns latency and simultaneous true/complement outputs for cross-checked latching. Use Value: Enables deterministic, hardware-level redundancy management without software intervention or FPGA logic overhead. |
Use Scenario: Routing analog-to-digital converter outputs from multiple sensor channels to a shared telemetry encoder under command-mode selection. IC Role / Device Role / Timing Role: Signal path selector with strobe-controlled isolation, ensuring no signal leakage during channel reconfiguration in launch-phase sequencing. Use Value: Guarantees clean break-before-make behavior and eliminates metastability risk in safety-critical guidance loops. |
| Satellite Payload Command Decoding | Hardened Test Equipment Interface |
|
Use Scenario: Demultiplexing uplinked command words to discrete subsystem controllers (power, thermal, comms) using hardware-selectable address bits. IC Role / Device Role / Timing Role: Address decoder front-end with true/complement outputs driving enable lines of radiation-hardened latch arrays. Use Value: Provides deterministic, single-cycle command distribution with no clock domain crossing or timing skew between channels. |
Use Scenario: Adapting test instrument I/O to legacy military board-level testers with fixed 16-pin DIP socket footprints and TTL-level signaling. IC Role / Device Role / Timing Role: Level- and format-translating multiplexer enabling reuse of aging ATE fixtures with modern signal sources. Use Value: Extends service life of certified test infrastructure while maintaining full MIL-STD-461E EMC compliance. |
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, pinout, and QML-38535 Class B qualification; differs only in part marking and lot trace format per manufacturer batch coding | No functional or environmental difference - accepted interchangeably in DoD-accredited production lines | Preferred when sourcing from alternate qualified manufacturers under same specification sheet (MIL-PRF-38535) |
| SN54LS158J | Same die, identical electrical specs, but commercial-grade screening (non-QML); lacks burn-in, radiation lot acceptance, and extended reliability reporting | Restricted to non-safety-critical ground support equipment or lab prototypes where full QML documentation is not mandated | Use only for development, testing, or non-flight hardware where cost sensitivity outweighs formal qualification requirements |
Compared with SNJ54LS158J, JM38510/30903BEA offers identical QML-38535 Class B assurance and can be substituted without design change, while SN54LS158J omits military screening and is unsuitable for flight hardware - selection hinges strictly on program-level qualification mandates.
Availability
SNJ54LS158J is available at Aetrix Electronics and suitable for avionics data bus arbitration, missile guidance signal routing, satellite payload command decoding, and hardened test equipment interface requiring stable component supply across extended temperature ranges and long-lifecycle programs.
Supply support for SNJ54LS158J 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 deep heritage in military and aerospace components.
The SNJ54LS158J belongs to TI's 54LS logic family, designed specifically for high-reliability, extended-temperature digital systems where deterministic timing, noise immunity, and QML certification are mandatory.
FAQ
What is the primary function of the SNJ54LS158J?
The SNJ54LS158J is a quad 2-line-to-1-line data selector/multiplexer with true and complemented outputs per channel. It routes one of two input signals (An or Bn) to each output pair based on a shared select (S) and strobe (G̅) control. Its design enables synchronized, low-glitch signal routing in mission-critical digital systems where timing predictability and hardware-level redundancy are essential - exactly as specified in the SNJ54LS158J datasheet and MIL-PRF-38535 requirements.
Does the SNJ54LS158J support operation outside the commercial temperature range?
Yes, the SNJ54LS158J is fully characterized and qualified for continuous operation from –55°C to +125°C. This extended range is validated per MIL-PRF-38535 screening protocols, including temperature cycling and parametric testing at extremes. Unlike commercial variants such as SN74LS158N, the SNJ54LS158J maintains guaranteed timing and drive strength across this full military range - a core requirement for its intended use in avionics and defense electronics.
Is the SNJ54LS158J pin-compatible with other 54LS multiplexers like SNJ54LS157J?
No, the SNJ54LS158J is not pin-compatible with SNJ54LS157J. While both are 16-pin CDIP devices, SNJ54LS157J provides dual 4:1 multiplexers (8 inputs, 2 outputs), whereas SNJ54LS158J implements quad 2:1 multiplexers (8 inputs, 8 true + 8 complement outputs). Their pin assignments differ significantly - for example, SNJ54LS158J dedicates pins 7, 8, 15, and 16 to complemented outputs, while SNJ54LS157J uses those pins for additional data inputs and select lines. Substitution requires PCB redesign.
What packaging and lead finish does the SNJ54LS158J use?
The SNJ54LS158J is supplied in a hermetically sealed 16-pin Ceramic Dual In-line Package (CDIP, package code J), with tin-lead (SNPB) lead finish. It is RoHS-exempt per TI's military product policy and rated for N/A moisture sensitivity level due to its ceramic construction. The device ships in tubes of 25 units, with part marking "7603301EA" and "SNJ54LS158J" visible on the top surface - consistent across all authorized production lots of the SNJ54LS158J.
Can the SNJ54LS158J be used in place of SN74LS158N in an existing design?
The SNJ54LS158J shares identical logic function, pinout, and DC/AC electrical specifications with SN74LS158N but adds QML-38535 Class B qualification, extended temperature range (–55°C to +125°C vs. 0°C to +70°C), and SNPB lead finish. It can replace SN74LS158N in hardware if the PCB supports the wider temperature range and the application requires military-grade reliability - however, SN74LS158N is RoHS-compliant while SNJ54LS158J is not, so regulatory compliance must be reassessed before substitution in the SNJ54LS158J implementation.
SNJ54LS158J 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:
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SNJ54LS158J FAQ
1.How can I place an order for SNJ54LS158J through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS158J 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 SNJ54LS158J reliable?
The price and inventory of SNJ54LS158J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS158J is usually 5 days.
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SNJ54LS158J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS158J 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 SNJ54LS158J?
For technical support, including SNJ54LS158J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS158J requirements.
6.How does Aetrix verify that SNJ54LS158J is sourced from the original manufacturer or authorized distributors?
All SNJ54LS158J 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 SNJ54LS158J meets industry standards.
7.What is the process for return or replacement of SNJ54LS158J?
All SNJ54LS158J units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS158J, 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 SNJ54LS158J part is unused and in its original packaging.
Return procedure for SNJ54LS158J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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