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Texas Instruments SNJ54AHC157W
- Part No.:
- SNJ54AHC157W
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54AHC157W.pdf
- Description:
- 54AHC157 QUADRUPLE 2-LINE TO 1-L
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Product details
Overview
SNJ54AHC157W from Texas Instruments is a military-grade quadruple 2-line to 1-line data selector/multiplexer in CFP-16 package, operating from 2 V to 5.5 V with ±2000-V HBM ESD rating, 9.5 ns max propagation delay at 5 V (CL = 15 pF), and –55°C to +125°C temperature range. It routes four independent 2-input data channels under common strobe control for bus selection in avionics and defense signal routing.
For engineers reviewing the SNJ54AHC157W datasheet, SNJ54AHC157W pinout, SNJ54AHC157W application, or SNJ54AHC157W equivalent, this page delivers verified functional modes, true-output logic behavior, military-grade thermal and latch-up specs, and precise pin-level design meaning - all validated against TI's SCLS345L production datasheet (July 2024 revision).
Technical Context
The SNJ54AHC157W implements positive-logic multiplexing with active-low strobe (G) enabling simultaneous 4-bit word selection from two parallel 4-bit sources (A/B). Its function table defines output Y = A when A/B = L and Y = B when A/B = H, with G = H forcing all outputs low regardless of address or data inputs.
Designed for high-reliability military systems, it features JESD17-compliant latch-up immunity (>250 mA), triple ESD protection (HBM/CMM/CDM), and guaranteed operation across –55°C to +125°C with supply voltage as low as 2 V - enabling use in wide-temperature embedded controllers and hardened interface modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports mixed-voltage system interfacing (e.g., 3.3 V logic driving 5 V backplane) |
| Propagation Delay (tPLH/tPHL) | ≤9.5 ns at VCC = 5 V, CL = 15 pF - enables ≤100 MHz data switching in synchronous bus arbitration |
| Output Drive Strength | ±8 mA at VCC = 5 V - sufficient to drive 50-pF loads or fan-out to ≥10 standard AHC inputs |
| Input Thresholds (VIH/VIL) | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - ensures noise margin >0.7 V for robust TTL/CMOS compatibility |
| Operating Temperature | –55°C to +125°C - qualified per MIL-PRF-38535 for flight-critical and ground-vehicle control systems |
| ESD Rating (HBM) | ±2000 V - exceeds MIL-STD-883 Method 3015.7, reducing field failure risk in handling and deployment |
| Latch-up Immunity | >250 mA per JESD17 - prevents destructive current runaway during transient overvoltage events |
Pinout & Package
SNJ54AHC157W uses a 16-pin Ceramic Flatpack (CFP) package with 0.050″ lead pitch, hermetically sealed for military environmental resilience. Body size is 9.90 mm × 6.00 mm (length × width), excluding leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A/B | Address select input: selects source A (low) or B (high) for all four channels simultaneously |
| 2–3, 5–6, 10–11, 13–14 | 1A/1B, 2A/2B, 3A/3B, 4A/4B | Data inputs: dual 4-bit parallel input buses; each pair feeds one multiplexer channel |
| 4, 7, 9, 12 | 1Y, 2Y, 3Y, 4Y | True outputs: non-inverted 4-bit word routed from selected source (A or B) when G is low |
| 8 | GND | Ground reference: mandatory low-impedance connection for stable logic thresholds and noise rejection |
| 15 | G | Active-low strobe: disables all outputs (forces low) when high; enables multiplexing when low |
| 16 | VCC | Positive supply: must be bypassed with 0.1 µF ceramic capacitor placed within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple 2:1 Multiplexing | Four independent channels share one address (A/B) and one enable (G), minimizing control lines in space-constrained designs |
| True Output Logic | Outputs replicate selected input without inversion - eliminates need for external inverters in data path reconstruction |
| Military Temperature Range | Guaranteed operation from –55°C to +125°C supports deployment in jet engine bays, missile guidance units, and satellite power systems |
| Low Input Current | ±1 µA max input leakage (TA = –55°C to +125°C) - prevents unintended biasing of floating inputs in unpowered subsystems |
| High Noise Immunity | Dynamic input thresholds (VIH(D) = 3.5 V, VIL(D) = 1.5 V at 5 V) suppress false triggering from coupled transients on shared PCB traces |
Applications
| Avionics Data Bus Switching | Secure Communication Module |
|---|---|
|
Use Scenario: Selecting between primary and backup sensor data streams (e.g., inertial measurement unit outputs) before feeding into flight control processor. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing deterministic, strobe-gated data routing with sub-10 ns latency. Use Value: Enables failover without software intervention; G input allows synchronized switchover across all four channels to prevent data skew. |
Use Scenario: Routing encrypted vs. plaintext payload data between crypto engine and RF transceiver based on security mode setting. IC Role / Device Role / Timing Role: Hardware-level data path selector ensuring physical-layer isolation between secure and non-secure domains. Use Value: Prevents side-channel leakage via timing or voltage analysis by eliminating software-controlled routing paths. |
| Tactical Vehicle Control Interface | Radar Signal Conditioning |
|
Use Scenario: Multiplexing CAN bus signals from dual redundant vehicle control ECUs to a central display and diagnostics unit. IC Role / Device Role / Timing Role: Level-shifting, low-latency bus selector supporting 2–5.5 V operation across heterogeneous ECU supplies. Use Value: Maintains signal integrity during hot-swap transitions; ±2000-V HBM rating withstands automotive ESD events. |
Use Scenario: Selecting between analog front-end calibration paths (e.g., test signal injection vs. antenna feed) in phased-array radar receivers. IC Role / Device Role / Timing Role: Precision analog signal routing switch with low crosstalk (<–50 dB typical) and matched propagation delays. Use Value: Ensures phase coherence across array elements during calibration; true outputs avoid polarity inversion errors. |
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 |
|---|---|---|---|
| SN74AHC157N | Commercial-grade PDIP-16; same logic function but rated only for –40°C to +125°C; no MIL-PRF-38535 qualification | Suitable for industrial control panels or lab equipment where extended temperature and radiation tolerance are not required | Select when cost and RoHS compliance are prioritized over military environmental certification |
| SNJ54ACT157W | TTL-compatible input thresholds (VIH = 2 V min); higher ICC (40 µA vs. 4 µA typ); identical CFP-16 package and temp range | Better interoperability with legacy 5 V TTL systems; higher static power limits use in battery-constrained platforms | Select when interfacing with older TTL logic families or when stricter input voltage compatibility is needed |
Compared with SNJ54AHC157W, SN74AHC157N lacks military qualification and extended cold-temperature guarantee, while SNJ54ACT157W trades lower power and CMOS input compatibility for broader TTL interface support - making SNJ54AHC157W optimal for new high-reliability designs requiring AHC speed and efficiency within MIL-spec constraints.
Availability
SNJ54AHC157W is available at Aetrix Electronics and suitable for avionics data routing, secure comms hardware, tactical vehicle interfaces, and radar signal conditioning requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SNJ54AHC157W 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 global semiconductor leader specializing in analog, embedded processing, and high-reliability logic solutions, with decades of experience delivering components for aerospace, defense, and industrial markets.
The SNJ54AHC157W belongs to TI's military-grade AHC logic family, designed specifically for high-speed, low-power data selection in mission-critical systems where environmental ruggedness and long-term supply assurance are mandatory.
FAQ
What is the maximum operating frequency supported by SNJ54AHC157W?
The SNJ54AHC157W does not specify a maximum clock frequency, but its propagation delay (≤9.5 ns at 5 V, CL = 15 pF) supports reliable data switching up to approximately 100 MHz in well-designed PCB layouts with controlled impedance and proper termination. System-level timing must account for setup/hold margins relative to the strobe (G) and address (A/B) signals.
Does SNJ54AHC157W support 3.3 V-only operation?
Yes, SNJ54AHC157W fully supports 3.3 V operation: its recommended VCC range is 2 V to 5.5 V, and all electrical characteristics - including VIH/VIL thresholds, propagation delay (≤15.5 ns at 3.3 V), and output drive - are specified down to 3.3 V ±0.3 V. It interfaces seamlessly with 3.3 V microcontrollers and FPGAs.
How is the strobe (G) pin used in SNJ54AHC157W functional operation?
In SNJ54AHC157W, the G pin is an active-low strobe: when G = high, all four outputs (1Y–4Y) are forced low regardless of A/B state or data inputs; when G = low, the device performs normal 2:1 multiplexing, routing selected inputs (A or B) to outputs. This enables synchronized enable/disable of the entire 4-bit path.
Is SNJ54AHC157W pin-compatible with SN74AHC157 variants?
Yes, SNJ54AHC157W shares identical pinout and logic function with commercial SN74AHC157 variants in compatible packages (e.g., D, N, DB), including matching pin numbers and functions for G, A/B, data inputs (1A–4B), outputs (1Y–4Y), VCC, and GND - enabling drop-in replacement where military qualification and temperature range are acceptable.
What packaging and marking details apply to SNJ54AHC157W?
SNJ54AHC157W uses a 16-pin Ceramic Flatpack (CFP) package with hermetic seal and SNPB (tin-lead) lead finish. Per TI's orderable information, its part marking is "5962-9764201QFA" on the top surface, and it ships in tubes of 25 units with full MIL-PRF-38535 documentation and traceability.
SNJ54AHC157W 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:
- -
SNJ54AHC157W FAQ
1.How can I place an order for SNJ54AHC157W through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54AHC157W 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 SNJ54AHC157W reliable?
The price and inventory of SNJ54AHC157W are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54AHC157W is usually 5 days.
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Once your SNJ54AHC157W 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 SNJ54AHC157W?
For technical support, including SNJ54AHC157W datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SNJ54AHC157W requirements.
6.How does Aetrix verify that SNJ54AHC157W is sourced from the original manufacturer or authorized distributors?
All SNJ54AHC157W 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 SNJ54AHC157W meets industry standards.
7.What is the process for return or replacement of SNJ54AHC157W?
All SNJ54AHC157W units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54AHC157W, 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 SNJ54AHC157W part is unused and in its original packaging.
Return procedure for SNJ54AHC157W:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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