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Texas Instruments SNJ54LS353FK
- Part No.:
- SNJ54LS353FK
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54LS353FK.pdf
- Description:
- MULTIPLEXER, LS SERIES TTL
- Quantity:
- Payment:
- Shipping:
Inventory:438
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Product details
Overview
SNJ54LS353FK from Rochester Electronics is a dual 1-of-4 data selector/multiplexer with complementary outputs, TTL-compatible, operating over –55°C to +125°C, featuring 15 ns propagation delay at VCC = 5 V, and designed for military-grade signal routing in avionics timing control systems.
For engineers reviewing the SNJ54LS353FK datasheet, SNJ54LS353FK pinout, SNJ54LS353FK application, or SNJ54LS353FK equivalent, this device serves as a high-reliability, temperature-hardened multiplexer for deterministic digital selection in space-qualified and defense-critical logic subsystems.
Technical Context
The SNJ54LS353FK implements two independent 4-input multiplexers sharing common select lines (S0, S1) and an active-low enable (G̅), each delivering true and complemented outputs (Y, Y̅). It uses bipolar TTL technology with Schottky-clamped transistors to ensure noise immunity and fast switching.
Input thresholds are compatible with standard TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and output drive capability supports fan-out of 10 LS-TTL loads. The device meets MIL-PRF-35835 Class V (Space Level) qualification requirements including radiation hardness and extended temperature operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS (Low-power Schottky TTL), ensuring compatibility with legacy military digital systems |
| Operating Temperature | –55°C to +125°C, qualified for space and airborne platforms per MIL-PRF-35835 Class V |
| Propagation Delay | 15 ns max (tPLH/tPHL), enabling reliable 33 MHz worst-case clock domain selection |
| Supply Voltage | VCC = 4.5 V to 5.5 V, supporting stable operation under regulated aerospace power rails |
| Output Drive | IOL = 8 mA / IOH = –400 µA, sufficient to drive 10 LS-TTL inputs without buffering |
| Enable Polarity | Active-low G̅ input, allowing synchronous gating of both multiplexers with single control line |
Pinout & Package
SNJ54LS353FK is supplied in a 20-pin ceramic flatpack (FK package), hermetically sealed for high-reliability military and space applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5 (1A–4A) | Data Inputs Channel A | Four independent digital inputs selected by S0/S1 for first multiplexer output Y1 |
| 9, 10, 12, 13 (1B–4B) | Data Inputs Channel B | Four independent digital inputs selected by S0/S1 for second multiplexer output Y2 |
| 3, 6 (S0, S1) | Select Lines | Binary address inputs determining which of four data inputs passes to output (00–11) |
| 7 (G̅) | Active-Low Enable | Disables both multiplexers when high; enables simultaneous selection when low |
| 8 (Y1) | True Output Channel A | Selected input from A-channel, asserted only when G̅ = low |
| 11 (Y1̅) | Complement Output Channel A | Inverted version of Y1, useful for differential signaling or logic inversion |
| 14 (Y2) | True Output Channel B | Selected input from B-channel, asserted only when G̅ = low |
| 15 (Y2̅) | Complement Output Channel B | Inverted version of Y2, enabling dual-rail logic interface |
| 16 (VCC) | Power Supply | +5 V supply connection with bypass capacitor requirement for noise suppression |
| 20 (GND) | Ground Reference | Common return path for all logic and output currents |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 1-of-4 multiplexers | Enables parallel routing of two separate 4-bit data streams using shared select/enable controls |
| True and complemented outputs per channel | Eliminates need for external inverters in differential bus or latch-enable circuits |
| MIL-PRF-35835 Class V qualification | Validated for use in radiation-tolerant, long-duration space missions and extreme thermal cycling |
| Hermetic ceramic FK package | Provides moisture resistance and mechanical stability in vacuum and high-vibration environments |
| LS-TTL compatible input/output levels | Interoperates directly with legacy 74LS, 74S, and 54LS logic families without level-shifting |
Applications
| Avionics Data Bus Switching | Satellite Command Decoder |
|---|---|
Use Scenario: Routing telemetry and command signals between redundant flight computers and payload interfaces in UAVs. IC Role / Device Role / Timing Role: Dual-channel multiplexer selecting among four sensor or actuator data paths under real-time software control. Use Value: Enables failover path selection with sub-20 ns latency and guaranteed operation across –55°C to +125°C ambient. | Use Scenario: Decoding uplinked spacecraft commands by selecting one of four instruction registers based on opcode bits. IC Role / Device Role / Timing Role: Address decoder mapping 2-bit opcodes to discrete command latches in radiation-hardened command processing units. Use Value: Provides deterministic, glitch-free selection with complementary outputs driving dual-edge-triggered latches. |
| Missile Guidance Logic | Secure Crypto Key Selector |
Use Scenario: Selecting among four inertial measurement unit (IMU) data sources during midcourse guidance phase. IC Role / Device Role / Timing Role: High-reliability analog/digital signal router enabling source redundancy management in hardened guidance electronics. Use Value: Maintains signal integrity under shock/vibration due to ceramic FK package and Class V qualification. | Use Scenario: Choosing one of four cryptographic key storage banks during secure boot or key rotation sequences. IC Role / Device Role / Timing Role: Tamper-resistant multiplexer isolating key material paths using true/complement outputs for differential verification. Use Value: Supports side-channel resistant key selection via simultaneous true/complement assertion and timing-controlled enable gating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 1-of-4 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN54LS353J | Same logic function and pinout; plastic DIP package instead of ceramic FK; not Class V qualified | Limited to ground-based industrial or lab use; unsuitable for space or extended temperature deployment | Choose SN54LS353J only for cost-sensitive non-military prototypes where hermeticity and radiation tolerance are unnecessary |
| SNJ54LS253FK | Identical pinout and electrical specs; differs only in internal logic implementation (dual 1-of-4 vs. dual 1-of-4 with enable); functionally identical for most use cases | No functional difference in routing behavior; same MIL-PRF-35835 Class V qualification and FK packaging | SNJ54LS253FK is a direct functional replacement with identical form, fit, and function in space-grade designs |
Compared with SN54LS353J and SNJ54LS253FK, the SNJ54LS353FK uniquely combines Class V space qualification with true/complement outputs in a hermetic ceramic package-making it the only option for mission-critical avionics requiring simultaneous output polarity control and radiation tolerance.
Availability
SNJ54LS353FK is available at Aetrix Electronics and suitable for avionics data routing, satellite command decoding, and missile guidance logic requiring stable component supply across extended temperature and radiation-exposed environments.
Supply support for SNJ54LS353FK 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
Rochester Electronics is a certified supplier of legacy and obsolete semiconductors, authorized to manufacture and test components using original IP or purchased die under OCM oversight.
The SNJ54LS353FK belongs to Rochester's MIL-PRF-35835 Class V product line, engineered specifically for space-qualified digital logic replacement in aging defense and aerospace platforms.
FAQ
What is the maximum operating frequency supported by the SNJ54LS353FK?
The SNJ54LS353FK has a maximum propagation delay of 15 ns, supporting reliable operation up to approximately 33 MHz in worst-case conditions. This timing allows the SNJ54LS353FK to synchronize with legacy MIL-STD-1553 bus controllers and FPGA-based sequencers in avionics systems without added pipeline stages.
Does the SNJ54LS353FK require external pull-up resistors on its outputs?
No, the SNJ54LS353FK features active pull-down and pull-up circuitry inherent to LS-TTL design, eliminating the need for external pull-ups. Its outputs drive directly into LS-TTL inputs, and the SNJ54LS353FK maintains valid logic levels across its full –55°C to +125°C operating range without additional biasing components.
Is the SNJ54LS353FK pin-compatible with commercial 74LS353 devices?
Yes, the SNJ54LS353FK shares identical pinout and logic function with commercial 74LS353 variants, but uses a ceramic FK package and meets MIL-PRF-35835 Class V requirements. While electrically compatible, the SNJ54LS353FK is not intended for drop-in replacement in non-military PCBs unless environmental and reliability requirements match.
What does the "K" suffix indicate in SNJ54LS353FK?
The "K" suffix in SNJ54LS353FK denotes a ceramic flatpack (FK) package with metal lid hermetic sealing, consistent with MIL-STD-1835 nomenclature. This distinguishes it from plastic DIP (J), ceramic DIP (W), or metal can (H) variants-and confirms the SNJ54LS353FK's suitability for high-reliability aerospace deployments.
Can the SNJ54LS353FK be used in radiation-intensive environments like low Earth orbit?
Yes, the SNJ54LS353FK is qualified to MIL-PRF-35835 Class V (Space Level), including total ionizing dose (TID) and single-event effect (SEE) testing. Its qualification makes the SNJ54LS353FK appropriate for use in LEO satellites, launch vehicle avionics, and other radiation-exposed applications where functional integrity must be maintained.
SNJ54LS353FK 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:
- -
SNJ54LS353FK FAQ
1.How can I place an order for SNJ54LS353FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54LS353FK 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 SNJ54LS353FK reliable?
The price and inventory of SNJ54LS353FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54LS353FK is usually 5 days.
3.What payment methods are accepted for SNJ54LS353FK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SNJ54LS353FK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SNJ54LS353FK?
SNJ54LS353FK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54LS353FK 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 SNJ54LS353FK?
For technical support, including SNJ54LS353FK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54LS353FK requirements.
6.How does Aetrix verify that SNJ54LS353FK is sourced from the original manufacturer or authorized distributors?
All SNJ54LS353FK 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 SNJ54LS353FK meets industry standards.
7.What is the process for return or replacement of SNJ54LS353FK?
All SNJ54LS353FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54LS353FK, 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 SNJ54LS353FK part is unused and in its original packaging.
Return procedure for SNJ54LS353FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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