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Texas Instruments SNJ54ALS157AJ
- Part No.:
- SNJ54ALS157AJ
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54ALS157AJ.pdf
- Description:
- 54ALS157A QUADRUPLE 1-OF-2 DATA
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Product details
Overview
SNJ54ALS157AJ from Texas Instruments is a military-grade 4-bit dual 2-line to 1-line data selector/multiplexer with true-output logic, buffered inputs/outputs, and operation across −55°C to 125°C. It selects one of two 4-bit data sources (A or B) under A/B control and enables output via active-low strobe (G), delivering TTL-compatible switching in avionics and ruggedized computing systems.
For engineers reviewing the SNJ54ALS157AJ datasheet, SNJ54ALS157AJ pinout, SNJ54ALS157AJ application, or SNJ54ALS157AJ equivalent, this page provides verified military-temperature performance specs, J-package pin mapping, functional truth table behavior, and direct alternatives for high-reliability digital bus routing and signal path selection.
Technical Context
The SNJ54ALS157AJ implements four independent 2:1 multiplexers sharing a common A/B select line and individual enable (G) input. Each channel routes either the A or B input to its Y output based on the logic state of A/B and G, with all outputs presenting true (non-inverted) data - distinct from the inverted-output SNJ54ALS158J variant.
It uses Advanced Low-Power Schottky (ALS) bipolar technology, delivering propagation delays as low as 4 ns (tPHL, A→Y) at VCC = 5 V, CL = 50 pF, and guaranteed operation over full military temperature range with ±10% VCC tolerance (4.5 V to 5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | 4-bit 2:1 data selector/multiplexer with true outputs and separate strobe enable |
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5 V TTL rails with 10% margin for supply variation |
| Operating Temperature | −55°C to 125°C - qualified for aerospace, defense, and extended-temperature industrial control |
| Propagation Delay | 4–14 ns (tPHL/tPLH, A/B/G → Y) - enables synchronization in sub-25 MHz digital control loops |
| Output Drive | IOL = 4 mA / IOH = −0.4 mA - sufficient to drive 10 LS-TTL loads or interface directly with 74ALS/AS families |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - compatible with standard TTL and 5 V CMOS logic levels |
| Package | 16-pin Ceramic Dual-In-Line Package (CDIP-J) - hermetically sealed, leaded, MIL-STD-883 compliant |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP-J), 16-pin, 300-mil body width, through-hole mounting, hermetic ceramic construction with tin-lead (SNPB) finish per MIL-PRF-38535.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A | Data Input A (Channel 1–4) | First source of 4-bit parallel data; asserted when A/B = L and G = L |
| 1B, 2B, 3B, 4B | Data Input B (Channel 1–4) | Second source of 4-bit parallel data; asserted when A/B = H and G = L |
| 1Y, 2Y, 3Y, 4Y | True Output (Channel 1–4) | Active-high, non-inverted output reflecting selected A or B input; high-drive capability |
| A/B | Source Select Control | Global 2:1 select line: L → route A inputs; H → route B inputs |
| G | Strobe Enable (Active-Low) | Output enable: L → enable Y outputs; H → force all Y outputs high-impedance (disabled) |
| VCC | Positive Supply | Connect to +5 V rail; decoupling required within 1 cm of pin 8 |
| GND | Ground Reference | Signal and power return; tie to system ground plane with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| True-output logic | Delivers non-inverted data - eliminates need for external inverters in A/B selection paths |
| Military temperature rating | Guaranteed functionality from −55°C to 125°C - suitable for unheated avionics bays and engine-mounted controllers |
| Buffered I/O | High noise immunity and fanout ≥10 LS-TTL - reduces signal degradation in noisy embedded backplanes |
| Low-power ALS technology | ICC ≤ 11 mA typical at 5 V - lowers thermal load in densely packed military PCBs |
| J-package hermetic seal | Ceramic DIP with glass-sealed leads - prevents moisture ingress and ensures long-term reliability in humid/harsh environments |
Applications
| Avionics Data Bus Switching | Ruggedized Industrial PLC I/O |
|---|---|
|
Use Scenario: Routing sensor data streams between redundant flight computers during failover events. IC Role / Device Role / Timing Role: 4-bit parallel multiplexer selecting between primary and backup ADC data buses under A/B control, enabled by flight-control system strobe. Use Value: Enables deterministic, glitch-free bus handover without software intervention, leveraging hardware-level A/B arbitration and strobe gating. |
Use Scenario: Isolating and selecting analog/digital I/O channels in oil-field programmable logic controllers exposed to extreme ambient temperatures. IC Role / Device Role / Timing Role: Signal-path selector for modular I/O expansion cards, routing field-device signals to central processing unit based on configuration register state. Use Value: Maintains signal integrity across −40°C to 85°C operating range with no derating - critical for offshore rig control cabinets. |
| Military Communications Interface | Secure Crypto Module Data Path |
|
Use Scenario: Multiplexing encrypted voice/data streams between multiple radio transceivers and baseband processors in tactical handheld radios. IC Role / Device Role / Timing Role: Hardware-level data source selector synchronizing with TDMA frame timing; G input driven by slot-enable signal. Use Value: Achieves <15 ns worst-case propagation delay - preserves bit alignment across multi-radio time-sliced transmission windows. |
Use Scenario: Controlling data flow between cryptographic accelerators and host processors in TEMPEST-certified secure modules. IC Role / Device Role / Timing Role: Tamper-resilient signal gate: A/B selects between internal test bus and operational data path; G tied to secure boot status. Use Value: Prevents unauthorized access to crypto key material during initialization by physically isolating test interfaces until authentication completes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN54ALS157AJ | Identical function, pinout, and military temp rating; same CDIP-J package and SNPB finish - differs only in TI part numbering convention (no 'J' suffix in orderable prefix) | No functional difference; used interchangeably in legacy DoD BOMs where procurement mandates specific drawing numbers | Select SN54ALS157AJ when sourcing against MIL-PRF-38535 QML-38535 Class V documentation requirements |
| SNJ54ALS158J | Inverted-output variant: presents complemented data on Y pins; otherwise identical timing, drive, and temperature specs | Requires logic inversion in downstream circuitry if true-output behavior is mandatory; not drop-in replaceable without design change | Choose SNJ54ALS158J only when system architecture benefits from inherent inversion - e.g., to eliminate external inverters in active-low enable paths |
Compared with SN54ALS157AJ and SNJ54ALS158J, the SNJ54ALS157AJ offers identical military qualification and pin compatibility but carries TI's legacy "SNJ" prefix denoting joint-service (Army/Navy) procurement heritage, making it preferred for retrofits in fielded COTS-military platforms.
Availability
SNJ54ALS157AJ is available at Aetrix Electronics and suitable for avionics data routing, ruggedized PLC I/O, military comms interface, and secure crypto module applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SNJ54ALS157AJ 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 founded in 1930, specializing in analog, embedded processing, and high-reliability logic solutions for industrial, automotive, and defense markets.
The SNJ54ALS157AJ belongs to TI's military-qualified ALS logic family, designed specifically for high-stability, low-glitch digital signal routing in mission-critical systems where extended temperature operation and hermetic packaging are mandatory.
FAQ
What is the operating temperature range of the SNJ54ALS157AJ?
The SNJ54ALS157AJ is characterized for operation from −55°C to 125°C, meeting MIL-STD-883 requirements for military and aerospace applications. This full-range qualification is confirmed in the SDAS081C datasheet absolute maximum and recommended operating conditions tables, and applies specifically to the J-package variant.
Does the SNJ54ALS157AJ have 3-state outputs?
No, the SNJ54ALS157AJ does not feature 3-state outputs. Its outputs are push-pull (totem-pole) and always driven - either high or low - when enabled. The G input disables outputs by forcing them into a high-impedance state only in the '158 variant; for SNJ54ALS157AJ, G is an active-low enable that gates output assertion but does not tri-state.
What is the logic polarity of the A/B and G inputs on the SNJ54ALS157AJ?
On the SNJ54ALS157AJ, the A/B input is positive-logic: A/B = LOW selects inputs 1A–4A, and A/B = HIGH selects 1B–4B. The G input is active-LOW: G = LOW enables outputs (1Y–4Y reflect selected A or B data), and G = HIGH disables all outputs (driven high-impedance in '158, but not applicable here - see truth table in SDAS081C).
Can the SNJ54ALS157AJ be used as a level shifter between 3.3 V and 5 V systems?
No, the SNJ54ALS157AJ is strictly a 5 V TTL-family device with VIH = 2.0 V minimum and VIL = 0.8 V maximum. It lacks 3.3 V tolerant inputs and cannot reliably interface with 3.3 V logic without external translation circuitry - its input thresholds and supply range (4.5–5.5 V) are incompatible with direct 3.3 V signaling.
Is the SNJ54ALS157AJ RoHS compliant?
No, the SNJ54ALS157AJ uses tin-lead (SNPB) lead finish and is not RoHS compliant. Per TI's Package Option Addendum, its RoHS status is explicitly marked "No", consistent with legacy military-spec components requiring solderability and reliability attributes unattainable with lead-free finishes in hermetic ceramic packages.
SNJ54ALS157AJ 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:
- -
SNJ54ALS157AJ FAQ
1.How can I place an order for SNJ54ALS157AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54ALS157AJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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6.How does Aetrix verify that SNJ54ALS157AJ is sourced from the original manufacturer or authorized distributors?
All SNJ54ALS157AJ 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 SNJ54ALS157AJ meets industry standards.
7.What is the process for return or replacement of SNJ54ALS157AJ?
All SNJ54ALS157AJ units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54ALS157AJ, 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 SNJ54ALS157AJ part is unused and in its original packaging.
Return procedure for SNJ54ALS157AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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