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Texas Instruments SNJ54AS250AJT
- Part No.:
- SNJ54AS250AJT
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
SNJ54AS250AJT.pdf
- Description:
- 1-OF-16 DATA GENERATORS/MULTIPLE
- Quantity:
- Payment:
- Shipping:
Inventory:2,156
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Product details
Overview
SNJ54AS250AJT from Texas Instruments is a military-grade 4-line-to-1-line 16-channel multiplexer with inverting W output, symmetrical propagation delay (2–9.5 ns), 3-state bus driver inputs, and operation over −55°C to 125°C. It selects one of 16 data inputs (E0–E15) using address lines A–D and enables cascading via buffered OE. Used in Boolean function generation and parallel-to-serial conversion in hardened avionics control logic.
For engineers reviewing the SNJ54AS250AJT datasheet, SNJ54AS250AJT pinout, SNJ54AS250AJT application, or SNJ54AS250AJT equivalent, key selection criteria include its ceramic DIP-24 package, TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), 32 mA low-level output drive, −12 mA high-level output sink, and guaranteed 3-state disable timing (tPZL ≤ 10 ns, tPHZ ≤ 6.5 ns).
Technical Context
The SNJ54AS250AJT implements full binary decoding across four select lines (A, B, C, D) to route one of sixteen data inputs (E0–E15) to the inverting W output. Its internal logic uses AS (Advanced Schottky) bipolar technology, delivering symmetrical tPLH/tPHL propagation delays and rail-to-rail output swing under load.
OE is a buffered active-low enable that places W in high-impedance without affecting internal data latching-allowing new input setup during output disable. The device supports n-line-to-1-line cascading and maintains functional integrity at VCC = 4.5–5.5 V across the full military temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with legacy 5 V TTL systems and stable operation under supply variation. |
| Propagation Delay (tPLH/tPHL) | 2 ns to 9.5 ns - Enables high-speed data routing in real-time control loops with predictable timing margins. |
| Output Drive (IOL/IOH) | 32 mA / −12 mA - Sufficient to directly drive multiple TTL loads without external buffers in bus applications. |
| 3-State Disable Time (tPZL/tPHZ) | 2 ns to 6.5 ns - Minimizes bus contention window during output enable/disable transitions. |
| Operating Temperature | −55°C to 125°C - Qualified for deployment in aerospace, defense, and downhole industrial environments. |
| Input Thresholds (VIH/VIL) | 2.0 V / 0.8 V - Matches standard TTL logic levels, eliminating level-shifting requirements in mixed-logic systems. |
| Supply Current (ICC) | 30–50 mA - Predictable power budgeting for thermal design in sealed, conduction-cooled modules. |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 24-pin, 300-mil width (JT package), hermetically sealable per MIL-STD-1835 GDIP3-T24 and JEDEC MO-058 AA. Pin 1 index mark on cap; lead finish is SnPb (non-RoHS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 23, 22, 21, 20, 19, 18, 17, 16 |
Data Inputs E0–E7, E8–E15 | 16 independent data sources selectable via address decode; all inputs TTL-compatible with defined VIH/VIL. |
| 9, 10, 11, 12 | Select Lines A, B, C, D | Binary address inputs controlling 1-of-16 channel selection; internally decoded with no external logic required. |
| 13 | Output Enable (OE) | Active-low 3-state control; high-impedance output when asserted, with no impact on internal data path state. |
| 14 | Inverting Output (W) | Complemented data output; driven low when selected input is high, and vice versa; symmetrical delay ensures clean edges. |
| 15 | GND | Signal reference ground plane connection; decoupling capacitor placement critical for noise immunity in high-speed switching. |
| 24 | VCC | +5 V supply rail; requires local 0.1 µF ceramic bypass capacitor adjacent to pin for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical Propagation Delay | tPLH and tPHL tightly matched (≤1 ns difference) - eliminates pulse skew in time-critical sampling paths. |
| Buffered 3-State Bus Driver Inputs | Enables direct connection to shared data buses without external drivers - reduces component count and layout complexity. |
| OE-Controlled Cascading | Allows stacking of multiple SNJ54AS250AJT devices for >16-input selection without external gating logic. |
| Military Temperature Qualification | Tested and characterized across −55°C to 125°C - eliminates derating calculations for high-reliability embedded deployments. |
| Inverting W Output Architecture | Provides complementary signal polarity by default - simplifies interface with downstream inverters or differential receivers. |
Applications
| Avionics Data Multiplexing | Secure Communication Signal Routing |
|---|---|
|
Use Scenario: Consolidating sensor telemetry (altitude, attitude, engine status) onto a single ARINC 429 or MIL-STD-1553B bus line in flight control computers. IC Role / Device Role / Timing Role: 16-channel analog/digital signal selector with deterministic <10 ns propagation delay and zero bus contention during reconfiguration. Use Value: Eliminates need for discrete logic gates or FPGA-based muxing, reducing SWaP-C and qualification effort in DO-254 Level A systems. |
Use Scenario: Dynamically routing encrypted payload data streams between multiple cryptographic modules and radio transceivers in tactical radios. IC Role / Device Role / Timing Role: Secure, low-latency data path switch with OE-controlled isolation - prevents cross-talk during key rotation or mode changes. Use Value: Maintains physical layer separation between security domains while enabling rapid reconfiguration without software intervention. |
| Industrial PLC I/O Expansion | Test Equipment Signal Conditioning |
|
Use Scenario: Expanding digital input capacity of legacy programmable logic controllers by aggregating 16 discrete field sensors (limit switches, proximity detectors) into one processor interface. IC Role / Device Role / Timing Role: Robust, high-noise-immunity multiplexer with TTL-compatible inputs and 32 mA drive strength for direct PLC bus loading. Use Value: Extends service life of installed PLC hardware without firmware updates or backplane modifications. |
Use Scenario: Configuring stimulus/response paths in automated test equipment (ATE) for semiconductor wafer probing, where signal routing must be repeatable and jitter-free. IC Role / Device Role / Timing Role: Precision timing mux with sub-10 ns delay matching - ensures phase coherence across multi-channel DUT stimulus waveforms. Use Value: Reduces measurement uncertainty in high-speed parametric testing by eliminating variable interconnect delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-channel multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SNJ54AS250AJ | Same die, identical electrical specs, but supplied in non-tube packaging (bulk or tape); no cap marking differentiation. | No functional difference - used interchangeably in production where tube packaging is not required for handling or traceability. | Select SNJ54AS250AJT when tube packaging, lot traceability, or MIL-PRF-38535 compliance documentation is mandated. |
| SNJ54LS250J | Lower speed (tPLH up to 25 ns), reduced drive (IOL = 8 mA), wider VCC tolerance (4.75–5.25 V only), and higher power consumption (ICC ≈ 60 mA). | Suitable for non-real-time control or legacy LS-based systems where propagation delay >15 ns is acceptable. | Choose SNJ54LS250J only if backward compatibility with existing LS logic families is required and timing budget allows ≥2× delay penalty. |
Compared with SNJ54AS250AJT, SNJ54AS250AJ offers identical performance in alternate packaging, while SNJ54LS250J trades speed and drive for broader voltage tolerance and legacy compatibility-making SNJ54AS250AJT optimal for new designs demanding deterministic sub-10 ns routing.
Availability
SNJ54AS250AJT is available at Aetrix Electronics and suitable for avionics subsystems, secure communications hardware, and industrial PLC upgrades requiring stable component supply across extended product lifecycles.
Supply support for SNJ54AS250AJT 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 SNJ54AS250AJT belongs to TI's military-grade Advanced Schottky (AS) logic family, designed specifically for high-speed, low-skew data routing in mission-critical systems operating under extreme environmental stress.
FAQ
What is the maximum clock frequency supported by SNJ54AS250AJT for reliable data selection?
The SNJ54AS250AJT does not operate on a clock; it is a combinatorial multiplexer. Its usable data rate is governed by propagation delay (max 9.5 ns) and setup/hold timing. For clean switching, input data must be stable ≥4 ns before address changes and held ≥2 ns after, supporting effective routing rates up to ~80 MHz in synchronous systems with proper timing margin.
Does SNJ54AS250AJT require external pull-up resistors on the W output?
No. The SNJ54AS250AJT features a totem-pole output stage on W, capable of actively driving both high and low logic states. External pull-ups are unnecessary and may cause contention or excessive current draw when W is driven low. Only decoupling capacitors on VCC are required for stable operation.
Can SNJ54AS250AJT be used in a non-inverting configuration?
No. The SNJ54AS250AJT provides only an inverting output (W). To obtain non-inverted data, a second SNJ54AS250AJT can be cascaded with identical address inputs and OE tied low, or a discrete inverter (e.g., SNJ54AS04J) must be added externally. The device has no internal non-inverting path or selectable polarity.
Is SNJ54AS250AJT RoHS compliant?
No. SNJ54AS250AJT uses SnPb (tin-lead) lead finish and is explicitly marked "No" for RoHS compliance in TI's packaging documentation. It is intended for high-reliability, hermetic, military/aerospace applications where Pb-free alternatives are not qualified or permitted per J-STD-006 and MIL-STD-883.
How does the OE pin behave during power-up or brown-out conditions?
The OE pin is buffered and does not float; however, TI's datasheet does not specify guaranteed reset behavior during VCC ramp. To ensure safe high-impedance startup, OE should be held high (disabled) via an RC network or supervisor IC until VCC stabilizes above 4.5 V, preventing unintended output contention on shared buses during power sequencing.
SNJ54AS250AJT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54AS
- Package/Case:
- 24-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Data Generator/Multiplexer
- Circuit:
- 1 x 16:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 12mA, 32mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-CDIP
SNJ54AS250AJT FAQ
1.How can I place an order for SNJ54AS250AJT through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AS250AJT 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 SNJ54AS250AJT reliable?
The price and inventory of SNJ54AS250AJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AS250AJT is usually 5 days.
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SNJ54AS250AJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SNJ54AS250AJT 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 SNJ54AS250AJT?
For technical support, including SNJ54AS250AJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AS250AJT requirements.
6.How does Aetrix verify that SNJ54AS250AJT is sourced from the original manufacturer or authorized distributors?
All SNJ54AS250AJT 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 SNJ54AS250AJT meets industry standards.
7.What is the process for return or replacement of SNJ54AS250AJT?
All SNJ54AS250AJT units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AS250AJT, 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 SNJ54AS250AJT part is unused and in its original packaging.
Return procedure for SNJ54AS250AJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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