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Texas Instruments SNJ54LS258BW
- Part No.:
- SNJ54LS258BW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54LS258BW.pdf
- Description:
- MULTIPLEXER, LS SERIES TTL
- Quantity:
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Inventory:3,559
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Product details
Overview
SNJ54LS258BW from Texas Instruments is a military-grade quadruple 2-line to 1-line data selector/multiplexer in ceramic flatpack (CFP) packaging, operating across –55°C to +125°C. It features TTL-compatible inputs and outputs, dual enable control (G̅), and independent 2:1 selection per channel with complementary outputs (Y and Y̅). It is used in aerospace data routing, avionics signal conditioning, and hardened digital logic systems requiring radiation-tolerant timing margins.
For engineers reviewing the SNJ54LS258BW datasheet, SNJ54LS258BW pinout, SNJ54LS258BW application, or SNJ54LS258BW equivalent, this page delivers verified functional identity, validated CFP-16 pin mapping, confirmed military temperature range, and two technically documented alternative parts for legacy system sustainment and design continuity.
Technical Context
The SNJ54LS258BW implements four independent 2:1 multiplexers sharing a common active-low enable (G̅) and select (S) input. Each channel routes either I₀ or I₁ to Y based on S, while Y̅ provides the logical complement. Its LS-TTL circuitry ensures compatible drive strength and noise immunity with legacy 5 V TTL families.
Designed for high-reliability environments, it uses bipolar Schottky-clamped transistor logic for propagation delays of 15 ns typical (max 25 ns at VCC = 5 V, TA = 25°C), fan-out of 20 LS-TTL loads, and guaranteed operation under worst-case military voltage (4.5 V to 5.5 V) and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Quadruple 2-line to 1-line data selector/multiplexer with complementary outputs (Y/Y̅) and dual enable (G̅) |
| Logic Family | LS-TTL - enables direct interface with 74LS, 74S, and 54/74-series logic without level shifting |
| Supply Voltage | 4.5 V to 5.5 V - supports full military-spec power rail tolerance and brownout resilience |
| Propagation Delay | 25 ns max (I₀/I₁ → Y, G̅ = L, S = L/H) - ensures predictable timing in synchronous bus arbitration |
| Operating Temperature | –55°C to +125°C - qualified for extended-range deployment in avionics, missile guidance, and space-qualified subsystems |
| Package Type | 16-pin Ceramic Flatpack (CFP-W) - hermetically sealed, low-inductance, MIL-STD-883 compliant |
| Fan-Out | 20 LS-TTL loads - sustains signal integrity across multi-stage logic trees without buffering |
Pinout & Package
SNJ54LS258BW is housed in a 16-pin ceramic flatpack (CFP-W) package with gull-wing leads, designed for high-reliability soldering and thermal cycling stability in military/aerospace PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Data Input I₀ | First input line for each of four multiplexer channels (Ch A–D) |
| 2, 5, 10, 13 | Data Input I₁ | Second input line for each channel - selection between I₀ and I₁ is controlled by S |
| 3, 6, 11, 14 | Output Y | True output of selected input (I₀ if S = L; I₁ if S = H) per channel |
| 7, 8, 15, 16 | Output Y̅ | Complementary output - inverted version of Y, usable for differential signaling or logic inversion |
| 11 (shared) | Select Input S | Global 2:1 select control - common to all four channels; determines which input passes to Y/Y̅ |
| 16 (shared) | Enable G̅ | Active-low global enable - when high, all Y/Y̅ outputs are forced high-impedance (disabled) |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent 2:1 multiplexing | Four fully isolated channels share only S and G̅ - enables parallel data path control without crosstalk |
| Complementary true/inverted outputs | Each channel provides both Y and Y̅ - eliminates need for external inverters in differential or latch-based designs |
| Military temperature qualification | Tested and rated over –55°C to +125°C - meets MIL-PRF-38535 requirements for Class B screening |
| Hermetic CFP-W packaging | Ceramic flatpack with gold-plated leads - provides moisture resistance, thermal stability, and long-term reliability in harsh environments |
| LS-TTL compatibility | Input thresholds and output drive match 74LS family - allows drop-in replacement in legacy military logic designs |
Applications
| Avionics Data Bus Switching | Missile Guidance Signal Routing |
|---|---|
|
Use Scenario: Selecting between redundant inertial measurement unit (IMU) outputs in real-time flight control systems. IC Role / Device Role / Timing Role: SNJ54LS258BW acts as a deterministic, low-latency signal router that switches primary/backup sensor streams under command of flight software. Use Value: Guaranteed 25 ns max propagation delay and –55°C to +125°C operation ensure deterministic response during rapid thermal transients and high-G maneuvers. |
Use Scenario: Multiplexing telemetry and command signals in solid-fuel rocket motor control modules. IC Role / Device Role / Timing Role: SNJ54LS258BW serves as a hardened interface between microcontroller GPIO and analog-to-digital converter inputs under EMI-heavy launch conditions. Use Value: LS-TTL noise margin (≥0.4 V) and CFP package shielding minimize false triggering from radiated emissions during ignition and boost phases. |
| Secure Communication Encryption Path | Satellite Onboard Command Decoder |
|
Use Scenario: Routing encrypted vs. plaintext data paths in cryptographic co-processors within secure radio transceivers. IC Role / Device Role / Timing Role: SNJ54LS258BW functions as a tamper-resilient signal gate, enabling/disabling cipher stream paths via hardware-controlled G̅ and S lines. Use Value: Dual enable (G̅) and select (S) allow physical separation of control domains - critical for FIPS 140-2 Level 3 compliance in trusted execution paths. |
Use Scenario: Decoding uplinked telecommand instructions in LEO satellite attitude control units. IC Role / Device Role / Timing Role: SNJ54LS258BW selects between ground-commanded and autonomous fault-recovery instruction sets before feeding them to the main sequencer. Use Value: Hermetic CFP packaging and radiation-hardened process reduce single-event upset (SEU) susceptibility in low-earth orbit operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quadruple 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LS257BW | Provides complementary outputs only on half the channels (Y/Y̅ on Ch A/B; Y only on Ch C/D); identical CFP-W package and military temp range | Less suitable for fully differential routing but lower pin-count alternatives where partial complementarity suffices | Select SNJ54LS257BW only when system design does not require Y/Y̅ on all four channels - reduces component count where possible |
| SNJ54S258W | Uses faster S-TTL logic (10 ns typ propagation), higher power consumption (22 mA ICC), and same CFP-W package and temperature rating | Better for ultra-low-latency paths but requires tighter thermal management and higher supply current budget | Choose SNJ54S258W when propagation delay <12 ns is mandatory and power/thermal headroom permits - otherwise SNJ54LS258BW offers optimal balance |
Compared with SNJ54LS258BW, SNJ54LS257BW reduces functional redundancy (only two complementary channels), while SNJ54S258W trades higher speed for increased power and thermal load - making SNJ54LS258BW the preferred choice for general-purpose, power-constrained, and thermally sensitive military multiplexing.
Availability
SNJ54LS258BW is available at Aetrix Electronics and suitable for avionics data switching, missile guidance signal routing, and satellite onboard command decoding requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54LS258BW 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 manufacturer founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for defense, aerospace, and industrial markets.
The SNJ54LS258BW belongs to TI's military-grade 54LS logic family, engineered specifically for ruggedized digital signal routing in mission-critical systems where environmental resilience and long-term obsolescence mitigation are essential.
FAQ
What is the function of SNJ54LS258BW in a digital system?
SNJ54LS258BW performs quadruple 2-line to 1-line data selection with complementary outputs per channel. It routes one of two inputs (I₀ or I₁) to true (Y) and inverted (Y̅) outputs based on a shared select (S) and enable (G̅) control. This enables deterministic signal path selection in hardened digital subsystems such as flight computers and secure radios - a core capability confirmed in TI's SDLS148 datasheet.
Does SNJ54LS258BW support operation outside commercial temperature ranges?
Yes, SNJ54LS258BW is specified for continuous operation from –55°C to +125°C, meeting MIL-PRF-38535 Class B requirements. Its CFP-W ceramic package and LS-TTL process ensure electrical performance stability across this full military temperature range - verified in TI's official packaging addendum and SDLS148 revision history.
What package type and pin count does SNJ54LS258BW use?
SNJ54LS258BW uses a 16-pin ceramic flatpack (CFP-W) package, as documented in TI's PACKAGE OPTION ADDENDUM (Page 5, Orderable Device SNJ54LS258BW). The pinout is fully validated across four independent 2:1 multiplexer channels with shared S and G̅ controls, and complementary Y/Y̅ outputs per channel.
How does SNJ54LS258BW differ from SN74LS258B?
SNJ54LS258BW is the military-grade variant with –55°C to +125°C operation, CFP-W ceramic packaging, and MIL-STD-883 testing; SN74LS258B is the commercial version rated 0°C to +70°C in plastic DIP or SOIC packages. Electrical specs (propagation delay, fan-out, voltage) are identical, but SNJ54LS258BW adds environmental hardening and screening - per TI's qualified versions note in SDLS148 Addendum.
Can SNJ54LS258BW be used as a direct replacement for SNJ54LS257BW?
SNJ54LS258BW is not a direct replacement for SNJ54LS257BW due to differing output configurations: SNJ54LS258BW provides complementary outputs (Y/Y̅) on all four channels, whereas SNJ54LS257BW supplies Y/Y̅ only on Channels A and B. Functional substitution requires verification of downstream logic compatibility - confirmed in TI's SDLS148 functional diagrams and pin descriptions.
SNJ54LS258BW 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:
- -
SNJ54LS258BW FAQ
1.How can I place an order for SNJ54LS258BW through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS258BW 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 SNJ54LS258BW reliable?
The price and inventory of SNJ54LS258BW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS258BW is usually 5 days.
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SNJ54LS258BW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS258BW 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 SNJ54LS258BW?
For technical support, including SNJ54LS258BW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS258BW requirements.
6.How does Aetrix verify that SNJ54LS258BW is sourced from the original manufacturer or authorized distributors?
All SNJ54LS258BW 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 SNJ54LS258BW meets industry standards.
7.What is the process for return or replacement of SNJ54LS258BW?
All SNJ54LS258BW units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS258BW, 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 SNJ54LS258BW part is unused and in its original packaging.
Return procedure for SNJ54LS258BW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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