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Texas Instruments SNJ54HC157FK
- Part No.:
- SNJ54HC157FK
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- -
- Datasheet:
-
SNJ54HC157FK.pdf
- Description:
- 54HC157 QUADRUPLE 2-LINE TO 1-LI
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Inventory:111
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Product details
Overview
SNJ54HC157FK from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in LCCC-20 package, operating across −55°C to +125°C with 2V–6V supply, 11ns typical propagation delay at 6V, ±6mA output drive, and low 80µA max ICC. It routes four independent 2:1 data paths under shared A/B address and active-low strobe (G) control, used in military-grade bus switching and logic-level signal routing.
For engineers reviewing the SNJ54HC157FK datasheet, SNJ54HC157FK pinout, SNJ54HC157FK application, or SNJ54HC157FK equivalent, this page delivers verified electrical specs, LCCC-20 terminal mapping, functional mode truth table, military temperature-range operation details, and direct alternatives for high-reliability multiplexer selection.
Technical Context
The SNJ54HC157FK implements four independent CMOS 2:1 multiplexers sharing one address select (A/B) input and one active-low strobe (G) input. All outputs go low when G is high, enabling synchronous channel blanking. Its TTL-compatible inputs accept standard logic thresholds while maintaining CMOS power efficiency.
It operates asynchronously with no internal clock; each Y output directly reflects the selected input (A or B) per channel, conditioned only by G state. Propagation delay varies with VCC (11ns typ. at 6V, 25°C, CL = 50pF) and load capacitance, with guaranteed performance over full military temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing and legacy 5V logic compatibility |
| Operating Temperature | −55°C to +125°C - qualified for military/aerospace applications per SN54 prefix |
| Propagation Delay (tpd) | 11ns typical at 6V, 25°C, CL = 50pF - enables ≤45MHz data switching in critical timing paths |
| Output Drive | ±6mA at 5V - drives 15 LSTTL loads or moderate capacitive loads without buffering |
| Quiescent Current (ICC) | 80µA maximum - ensures ultra-low static power in battery-backed or standby systems |
| Input Leakage Current | ±1µA maximum - minimizes voltage divider errors in high-impedance bias networks |
| Logic Family | High-speed CMOS (HC) - provides noise immunity, rail-to-rail swing, and TTL-compatible thresholds |
Pinout & Package
LCCC-20 (FK) ceramic package: 8.89 mm × 8.45 mm body, 20 leads, hermetically sealed, leadless, surface-mount compatible with solder reflow or epoxy bonding. Designed for high-reliability, high-temperature, and radiation-tolerant environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 | Signal I/O | Correspond to A/B, 1A–4A, 1B–4B, 1Y–4Y, G - all digital logic terminals; pin numbering follows TI FK-package top-view layout |
| 8, 20 | GND | Dual ground terminals - required for low-noise operation and thermal dissipation in LCCC |
| 19 | VCC | Single positive supply terminal - must be decoupled locally with 0.1µF capacitor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2:1 multiplexing | Four independent channels share one A/B select and one G strobe - reduces control logic and PCB routing vs. discrete muxes |
| Active-low strobe (G) | Forces all Y outputs LOW regardless of A/B or data inputs - enables synchronized channel disable or bus contention prevention |
| TTL-compatible inputs | VIH = 3.15V min at VCC = 4.5V - interoperates directly with 74LS/74F logic without level shifters |
| Low input capacitance | Ci = 10pF max - minimizes loading on upstream drivers and preserves signal edge integrity |
| Military-grade qualification | SN54 prefix, −55°C to +125°C operation, 5962-86061012A part marking - meets MIL-PRF-38535 requirements |
Applications
| Avionics Data Bus Switching | Secure Communication Module Routing |
|---|---|
|
Use Scenario: Selecting between redundant sensor data streams (e.g., inertial measurement units) before feeding into flight control processor. IC Role / Device Role / Timing Role: Quad 2:1 mux synchronously gates four parallel data lines using common A/B and G signals under real-time OS control. Use Value: Enables failover switching with <11ns latency and guaranteed operation at −55°C during cold-soak startup. |
Use Scenario: Routing encrypted payload data between dual crypto engines and RF transceivers in Type 1 COMSEC hardware. IC Role / Device Role / Timing Role: Isolates active data path while blanking unused outputs via G strobe to prevent side-channel leakage. Use Value: Provides deterministic, low-jitter signal routing with zero static current draw during standby (ICC ≤ 80µA). |
| Test Equipment Signal Multiplexing | Ruggedized Industrial Controller I/O Expansion |
|
Use Scenario: Scanning multiple analog sensor inputs through a single ADC channel in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Acts as front-end digital selector for 4-bit parallel sensor bus, driven by microcontroller GPIOs. Use Value: Delivers 6mA drive strength to overcome cable capacitance and maintains signal fidelity up to 45MHz sampling rates. |
Use Scenario: Expanding digital I/O capability in programmable logic controllers deployed in oilfield downhole monitoring systems. IC Role / Device Role / Timing Role: Routes control signals between PLC CPU and isolated field I/O modules under extreme ambient temperatures. Use Value: Operates reliably at +125°C with no derating, eliminating need for external thermal management or derated components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quadruple 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC157N | PDIP-16, commercial temp (−40°C to +85°C), same logic function and pinout except LCCC-20 vs. PDIP-16 footprint | Used in lab prototypes and non-military industrial systems where hermeticity and extended temperature not required | Select SN74HC157N for cost-sensitive, non-ruggedized designs with standard through-hole assembly. |
| CD74HC157E | PDIP-16, identical electrical specs but manufactured by TI under different part-numbering scheme; RoHS-compliant, same 2V–6V range | Preferred for new commercial designs requiring RoHS compliance and TI's latest process revision | Choose CD74HC157E when RoHS compliance and modern packaging logistics outweigh legacy military qualification needs. |
Compared with SNJ54HC157FK, SN74HC157N offers lower cost and easier prototyping but lacks military temperature range and hermetic sealing; CD74HC157E matches electrical behavior and adds RoHS compliance but omits SN54-level screening and extended reliability testing.
Availability
SNJ54HC157FK is available at Aetrix Electronics and suitable for avionics data routing, secure comms module design, ruggedized industrial controller development, and high-reliability test equipment requiring stable component supply across extended temperature and long lifecycle commitments.
Supply support for SNJ54HC157FK 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 logic ICs, with decades of heritage in high-reliability military and aerospace components.
The SN54HC157 product line delivers radiation-tolerant, temperature-hardened CMOS multiplexers for mission-critical systems where failure is not an option - designed specifically for defense, space, and harsh-environment industrial use.
FAQ
What is the operating temperature range of the SNJ54HC157FK?
The SNJ54HC157FK operates from −55°C to +125°C, meeting MIL-PRF-38535 Class B requirements. This extended range is enabled by its SN54 prefix, ceramic LCCC-20 package, and high-temperature silicon process - confirmed in TI's SCLS113F datasheet Section 4.2. The SNJ54HC157FK is fully characterized across this range for propagation delay, drive strength, and leakage current.
Does the SNJ54HC157FK have pin-to-pin compatibility with other HC157 variants?
No - the SNJ54HC157FK uses a 20-pin LCCC (FK) package, while most other HC157 variants (e.g., SN74HC157N, CD74HC157E) use 16-pin packages like PDIP or SOIC. Pin count, layout, and terminal assignment differ fundamentally; the SNJ54HC157FK requires dedicated PCB footprint and layout per TI's mechanical drawings in Section 10.
What is the function of the G (strobe) input on the SNJ54HC157FK?
The G input on the SNJ54HC157FK is an active-low strobe that forces all four Y outputs LOW regardless of A/B select state or input data values. This enables synchronized channel blanking, bus isolation, or safe power-up sequencing - a key feature confirmed in the Function Table (Table 6-1) and Description section of the SNJ54HC157FK datasheet.
Can the SNJ54HC157FK drive LSTTL loads directly?
Yes - the SNJ54HC157FK can drive up to 15 LSTTL loads, as stated in its Features list. This is supported by its ±6mA output drive capability at 5V (Section 4.4 Electrical Characteristics) and TTL-compatible input thresholds, allowing direct interface with legacy 74LS-series logic without level-shifting circuitry.
Is the SNJ54HC157FK RoHS compliant?
No - the SNJ54HC157FK uses SNPB (tin-lead) lead finish and is marked "No" for RoHS in TI's Packaging Addendum. It is intended for military/aerospace applications where Pb-based finishes are permitted and preferred for solder joint reliability under thermal cycling. For RoHS-compliant alternatives, consider CD74HC157E or SN74HC157DR.
SNJ54HC157FK 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:
- -
SNJ54HC157FK FAQ
1.How can I place an order for SNJ54HC157FK through Aetrix?
Please submit a Request for Quotation (RFQ) for SNJ54HC157FK 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 SNJ54HC157FK reliable?
The price and inventory of SNJ54HC157FK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SNJ54HC157FK is usually 5 days.
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Once your SNJ54HC157FK 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.
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6.How does Aetrix verify that SNJ54HC157FK is sourced from the original manufacturer or authorized distributors?
All SNJ54HC157FK 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 SNJ54HC157FK meets industry standards.
7.What is the process for return or replacement of SNJ54HC157FK?
All SNJ54HC157FK units undergo pre-shipment inspection (PSI). If there is an issue with SNJ54HC157FK, 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 SNJ54HC157FK part is unused and in its original packaging.
Return procedure for SNJ54HC157FK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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