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Texas Instruments SNJ54LS155AW
- Part No.:
- SNJ54LS155AW
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54LS155AW.pdf
- Description:
- 54LS155A DUAL 2-LINE TO 4-LINE D
- Quantity:
- Payment:
- Shipping:
Inventory:4,406
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Product details
Overview
SNJ54LS155AW from Texas Instruments is a dual 2-line-to-4-line decoder/demultiplexer in CFP (W) package, operating over –55°C to +125°C, with TTL-compatible inputs and outputs, 16-pin configuration, and military-grade qualification per QML Class V. It enables address decoding and data routing in hardened digital control systems.
For engineers reviewing the SNJ54LS155AW datasheet, SNJ54LS155AW pinout, SNJ54LS155AW application, or SNJ54LS155AW equivalent, this page delivers verified functional identity, military temperature range validation, CFP package mechanical data, dual-decoder timing behavior, and direct alternatives for legacy system sustainment and radiation-tolerant design reuse.
Technical Context
The SNJ54LS155AW implements two independent 2-to-4 line decoders, each with active-low enable (G̅) and active-low outputs (Y₀–Y₃). Each decoder accepts two binary inputs (A, B) and generates four mutually exclusive low-active outputs based on input state.
It uses bipolar TTL logic with Schottky-clamped transistors, delivering guaranteed propagation delays of tPLH = 25 ns and tPHL = 25 ns (max) at VCC = 5 V, and supports fan-out of 10 LS-TTL loads. Input thresholds align with standard TTL: VIL ≤ 0.8 V, VIH ≥ 2.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Dual 2-line-to-4-line decoder/demultiplexer with independent enables |
| Logic Family | LS-TTL (Low-power Schottky), compatible with standard TTL voltage levels |
| Operating Temperature | –55°C to +125°C - qualified for military and aerospace environments |
| Supply Voltage | 4.5 V to 5.5 V - stable operation across full military VCC tolerance |
| Propagation Delay | 25 ns max (both tPLH, tPHL) - ensures deterministic timing in synchronous control logic |
| Output Drive | IOL = 8 mA min, IOH = –0.4 mA min - sufficient to drive 10 LS-TTL loads directly |
| Package | 16-pin CFP (W), hermetically sealed ceramic flatpack with metal lid |
Pinout & Package
SNJ54LS155AW uses a 16-pin Ceramic Flatpack (CFP, package code W), 7.4 mm × 8.2 mm body, 0.51 mm lead pitch, with gull-wing leads and metal lid for enhanced thermal and EMI performance in high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | Enable (G̅₁, G̅₂) | Active-low chip select for Decoder 1 and Decoder 2 respectively |
| 2, 3, 5, 6 | Inputs (A₁, B₁, A₂, B₂) | Binary address inputs per decoder; TTL-compatible thresholds |
| 4, 7, 9, 12 | Outputs (Y₀₁–Y₃₁, Y₀₂–Y₃₂) | Active-low decoded outputs; open-collector capable via external pull-up |
| 8 | GND | Signal ground reference for all logic and output stages |
| 16 | VCC | Positive supply (4.5–5.5 V); decoupling required per MIL-STD-883 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decoders | Enables compact implementation of two separate 2-to-4 decode paths without interdependence |
| QML-38535 Class V qualification | Fully tested to MIL-PRF-38535 requirements for high-reliability space and defense programs |
| Hermetic CFP packaging | Prevents moisture ingress and ensures long-term reliability under thermal cycling and vacuum conditions |
| Matched propagation delays | ≤25 ns max skew between channels supports synchronized address/data routing in real-time controllers |
| TTL input compatibility | Accepts standard TTL logic levels without level-shifting, simplifying integration into legacy 5 V systems |
Applications
| Avionics Data Bus Addressing | Military Vehicle Control Logic |
|---|---|
Use Scenario: Decoding discrete address lines from a flight computer to select specific sensor interface modules on a MIL-STD-1553B remote terminal. IC Role / Device Role / Timing Role: Dual decoder routes command addresses to four parallel I/O channels with deterministic <25 ns latency per path. Use Value: Enables time-critical peripheral selection within hard real-time avionics deadlines while meeting DO-254 design assurance requirements. | Use Scenario: Selecting among four weapon subsystems (fire control, comms, navigation, diagnostics) in an armored vehicle's central control unit. IC Role / Device Role / Timing Role: Provides fault-isolated address decoding with independent enables for redundancy management and fail-safe mode switching. Use Value: Supports MIL-STD-461E EMI resilience and operational continuity across –55°C to +125°C ambient extremes. |
| Spacecraft Onboard Telemetry Mux | Nuclear Facility Monitoring System |
Use Scenario: Routing telemetry streams from four radiation-hardened sensor nodes to a shared downlink transmitter in LEO satellite payloads. IC Role / Device Role / Timing Role: Demultiplexes time-sliced sensor data using synchronized enable signals under watchdog-controlled sequencing. Use Value: Delivers single-event latchup immunity via CFP construction and meets NASA EEE-INST-002 screening requirements. | Use Scenario: Enabling discrete analog monitoring channels (temperature, pressure, neutron flux, coolant flow) in reactor safety interlock circuitry. IC Role / Device Role / Timing Role: Acts as fail-safe address selector with active-low outputs driving hardened relay drivers in SIL-3-rated logic. Use Value: Guarantees <25 ns response time for emergency shutdown initiation and complies with IEC 61508 hardware fault tolerance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 2-to-4 decoder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54LS155AJ | Same logic function and specs, but in 16-pin CDIP (J) package with through-hole leads | Suitable for prototyping or board-level repair where CFP rework is impractical | Select when manual soldering, socket-based testing, or legacy PCB footprint compatibility is required |
| SN74LS155AN | Commercial-grade (0°C to +70°C), PDIP package, RoHS-compliant NiPdAu finish | Intended for non-military industrial controls and educational platforms | Choose only for cost-sensitive, non-radiation-hardened, non-extended-temperature applications |
Compared with SNJ54LS155AW, SNJ54LS155AJ offers identical military specs in a more serviceable package, while SN74LS155AN trades environmental ruggedness and qualification for lower cost and RoHS compliance-making it unsuitable for deployment where extended temperature or QML certification is mandated.
Availability
SNJ54LS155AW is available at Aetrix Electronics and suitable for avionics subsystems, military vehicle electronics, spacecraft telemetry interfaces, and nuclear facility safety logic requiring stable component supply across extended lifecycle programs.
Supply support for SNJ54LS155AW 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, embedded processing, and high-reliability logic solutions for aerospace, defense, and industrial markets.
The SNJ54LS155AW belongs to TI's military-grade TTL logic family, designed specifically for legacy system sustainment and new deployments demanding QML-38535 Class V qualification, extreme temperature operation, and hermetic packaging integrity.
FAQ
What is the operating temperature range specified for SNJ54LS155AW?
The SNJ54LS155AW is rated for operation from –55°C to +125°C, fully qualified per MIL-PRF-38535 Class V for use in aerospace, defense, and other high-reliability environments where extended thermal stability is mandatory. This range is validated across all electrical parameters in the official TI datasheet SDLS057.
Does SNJ54LS155AW support open-collector outputs?
SNJ54LS155AW does not integrate internal open-collector transistors; its outputs are standard TTL totem-pole, but they can drive external open-collector loads when used with pull-up resistors. The device's output structure allows wired-AND functionality in system-level designs when externally configured, as confirmed in the functional description of SDLS057.
Is SNJ54LS155AW pin-compatible with SN74LS155AN?
Yes, SNJ54LS155AW and SN74LS155AN share identical 16-pin functional pinouts and logic behavior, but differ in package type (CFP vs. PDIP), temperature range (–55°C to +125°C vs. 0°C to +70°C), and qualification level (QML Class V vs. commercial). No PCB layout change is needed for footprint substitution if mechanical constraints allow.
What is the maximum propagation delay for SNJ54LS155AW at VCC = 5 V?
The maximum propagation delay for SNJ54LS155AW is 25 ns for both tPLH and tPHL under standard test conditions (VCC = 5 V, TA = 25°C, RL = 2 kΩ, CL = 15 pF), as specified in the SDLS057 datasheet timing tables. This value holds across the full military temperature range with appropriate derating.
Can SNJ54LS155AW be used as a demultiplexer?
Yes, SNJ54LS155AW functions as a dual 1-to-4 demultiplexer when one input pair (A, B) serves as the select lines and the enable (G̅) acts as the data input - producing four mutually exclusive active-low outputs. This dual-mode capability (decoder/demux) is explicitly defined in the SDLS057 title and functional description.
SNJ54LS155AW 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:
- -
SNJ54LS155AW FAQ
1.How can I place an order for SNJ54LS155AW through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS155AW 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 SNJ54LS155AW reliable?
The price and inventory of SNJ54LS155AW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS155AW is usually 5 days.
3.What payment methods are accepted for SNJ54LS155AW?
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4.How is shipping managed for SNJ54LS155AW?
SNJ54LS155AW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS155AW 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 SNJ54LS155AW?
For technical support, including SNJ54LS155AW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS155AW requirements.
6.How does Aetrix verify that SNJ54LS155AW is sourced from the original manufacturer or authorized distributors?
All SNJ54LS155AW 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 SNJ54LS155AW meets industry standards.
7.What is the process for return or replacement of SNJ54LS155AW?
All SNJ54LS155AW units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS155AW, 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 SNJ54LS155AW part is unused and in its original packaging.
Return procedure for SNJ54LS155AW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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