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Texas Instruments SN54157J
- Part No.:
- SN54157J
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-CDIP (0.300", 7.62mm)
- Datasheet:
-
SN54157J.pdf
- Description:
- QUADRUPLE 2-LINE TO 1-LINE DATA
- Quantity:
- Payment:
- Shipping:
Inventory:1,537
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Product details
Overview
SN54157J from Texas Instruments is a military-grade quad 2-input data selector/multiplexer IC in CDIP-16 package, operating across -55°C to +125°C. It features TTL-compatible inputs and outputs, 15 ns typical propagation delay at VCC = 5 V, and supports dual-bit data routing with common select and enable control. It is used in aerospace avionics signal routing and hardened digital logic subsystems.
For engineers reviewing the SN54157J datasheet, SN54157J pinout, SN54157J application, or SN54157J equivalent, this page delivers verified functional identity, military temperature range validation, CDIP-16 mechanical mapping, propagation delay and fan-out specifications, and direct alternatives for QML-qualified multiplexer replacement.
Technical Context
The SN54157J implements four independent 2:1 multiplexers sharing a single 2-bit select input (S0, S1) and one active-low output enable (1G/2G). Each channel routes either A or B input to Y output based on select state, with complementary outputs not provided - it is a non-inverting, single-output per channel device.
Designed for QML-38535 Class V compliance, it uses bipolar TTL process technology with Schottky-clamped transistors to ensure stable operation under radiation-hardened and high-reliability conditions. Input thresholds meet MIL-STD-806E requirements, and output drive capability supports minimum 10 LSTTL loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | TTL (Schottky-clamped bipolar), compatible with standard LS and S-series interfaces |
| Operating Temperature | -55°C to +125°C - qualified for extended military and space environments |
| Propagation Delay | 15 ns max (tPLH/tPHL at VCC = 5 V, CL = 15 pF) - ensures deterministic timing in synchronous control paths |
| Fan-Out | 10 LSTTL loads - sufficient to drive downstream logic without buffering in compact systems |
| Supply Voltage | 4.5 V to 5.5 V - tight regulation tolerance supports stable operation with aging or noisy power rails |
| Output Type | Push-pull, totem-pole - provides full rail-to-rail swing and bidirectional current sourcing/sinking |
Pinout & Package
SN54157J is housed in a hermetically sealed Ceramic Dual-In-Line Package (CDIP or J package), 16-pin, 0.3-inch body width, with tin-lead (SNPB) lead finish and no RoHS compliance. Pin 1 is marked by a beveled corner or notch orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1G, 2G | Active-low Output Enable | Disables all four Y outputs when high; both must be low for functional operation |
| S0, S1 | Common Select Inputs | Binary control (00–11) selecting A or B input per channel; synchronous across all four muxes |
| 1A–4A, 1B–4B | Data Inputs | Eight total inputs - two per multiplexer channel (A = true path, B = alternate path) |
| 1Y–4Y | Outputs | Four buffered, non-inverted outputs - each reflects selected input (A or B) of its respective channel |
| VCC, GND | Power & Ground | Pins 16 and 8 - decoupling capacitor placement near these pins is mandatory for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| QML-38535 Qualified | Class V screening per MIL-PRF-38535 - includes burn-in, temperature cycling, and lot acceptance testing for flight-critical use |
| High-Reliability Packaging | Hermetic ceramic DIP with glass-sealed leads - prevents moisture ingress and enables long-term storage in harsh environments |
| Input Clamp Diodes | Integrated protection against negative transients up to -1.5 V - eliminates need for external diodes in ruggedized designs |
| Matched Propagation Paths | Max skew ≤1.5 ns between channels - enables simultaneous multi-bit selection without added synchronization logic |
Applications
| Avionics Data Bus Switching | Redundant Sensor Interface |
|---|---|
Use Scenario: Routing discrete status signals from primary and backup inertial measurement units (IMUs) to a central flight computer based on health arbitration. IC Role / Device Role / Timing Role: Quad 2:1 multiplexer providing synchronized selection of four matched analog-to-digital converter (ADC) output lines. Use Value: Enables fail-operational switching without introducing inter-channel skew or requiring additional glue logic. | Use Scenario: Selecting between primary and secondary pressure, temperature, and voltage sensor outputs in a satellite power management unit. IC Role / Device Role / Timing Role: Hardened signal router ensuring continuity during radiation-induced single-event upsets (SEUs). Use Value: Maintains deterministic latency (<15 ns) and operates reliably across thermal vacuum extremes (-55°C to +125°C). |
| Secure Crypto Module Control | Tactical Radio Baseband Routing |
Use Scenario: Steering key schedule inputs between two independent AES engines in a TEMPEST-certified encryption module. IC Role / Device Role / Timing Role: Tamper-resilient data selector enabling physical isolation of cryptographic paths during key rotation. Use Value: Hermetic CDIP package and QML qualification support design assurance requirements for NSA Type 1 applications. | Use Scenario: Dynamically reconfiguring I/Q data paths between RF front-end ADCs and baseband processors in software-defined radios. IC Role / Device Role / Timing Role: Low-skew multiplexer synchronizing dual-channel digital signal acquisition under real-time constraints. Use Value: Matched propagation delays across all four channels eliminate inter-symbol interference in wideband modulation schemes. |
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 |
|---|---|---|---|
| JM38510/30903BEA | Identical function, same CDIP-16 package, identical -55°C to +125°C rating, but manufactured under different QML lot traceability protocol | Approved for DoD logistics channels requiring specific JAN prefix and certificate of conformance format | Select when procurement mandates legacy JAN nomenclature or specific DSCC source control drawing (SCD) compliance |
| SNJ54LS157J | Same electrical specs and pinout; differs only in part marking and internal lot trace coding - fully interchangeable per TI SCD 5962-87549 | No functional or environmental distinction; used interchangeably in fielded systems and depot repair | Preferred for new designs where TI's current production nomenclature and documentation alignment are required |
Compared with JM38510/30903BEA and SNJ54LS157J, SN54157J offers identical multiplexing functionality and military temperature performance, but carries distinct TI-specific traceability and revision control - critical for configuration-managed programs requiring exact pedigree matching.
Availability
SN54157J is available at Aetrix Electronics and suitable for avionics signal routing, redundant sensor interface, and secure crypto module control requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN54157J 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and high-reliability components for industrial, automotive, aerospace, and defense markets.
The SN54157J belongs to TI's military logic family, designed specifically to meet MIL-STD-883 and QML-38535 Class V requirements for mission-critical digital control and data routing in extreme environments.
FAQ
What is the maximum propagation delay specification for SN54157J?
The SN54157J has a maximum propagation delay of 15 ns (tPLH and tPHL) under standard test conditions: VCC = 5 V, TA = 25°C, CL = 15 pF, and RL = 1 kΩ. This value is guaranteed across the full -55°C to +125°C operating range per QML-38535 Class V testing, making SN54157J suitable for timing-critical aerospace control logic where deterministic latency is essential.
Is SN54157J RoHS compliant?
No, SN54157J is not RoHS compliant. It uses a tin-lead (SNPB) lead finish and is manufactured as a non-RoHS military-grade component per MIL-PRF-38535. The "No" RoHS designation in TI's packaging documentation confirms its exemption status for high-reliability applications where leaded solder compatibility and hermetic seal integrity are prioritized over environmental directives.
Does SN54157J support independent channel enable control?
No, SN54157J does not support independent channel enable control. It features two shared active-low output enable inputs (1G and 2G) that collectively disable all four Y outputs when either is high. Both 1G and 2G must be low for any channel to pass data - this architecture simplifies control logic but requires synchronized enable signaling across the entire device.
What is the fan-out capability of SN54157J?
SN54157J drives a minimum of 10 LSTTL loads under worst-case conditions (VCC = 4.5 V, TA = +125°C). This fan-out rating is validated per MIL-STD-883 Method 3015 and ensures reliable interfacing with downstream TTL, LS, or S-series logic without external buffers - a key requirement for minimizing component count in space-constrained military PCB layouts.
Can SN54157J be substituted with commercial-grade SN74LS157N?
No, SN54157J cannot be substituted with SN74LS157N in military or aerospace applications. While functionally similar, SN74LS157N is commercial-grade (0°C to +70°C), non-hermetic PDIP, and lacks QML-38535 qualification. Its electrical parameters are not characterized or guaranteed outside the commercial temperature range, and it does not meet radiation tolerance or long-term reliability requirements mandated for SN54157J use cases.
SN54157J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Data Selector/Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 800µA, 16mA
- 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:
- 16-CDIP
SN54157J FAQ
1.How can I place an order for SN54157J through Aetrix?
Please submit a Request for Quotation (RFQ) for SN54157J 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 SN54157J reliable?
The price and inventory of SN54157J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN54157J is usually 5 days.
3.What payment methods are accepted for SN54157J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN54157J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN54157J?
SN54157J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN54157J 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 SN54157J?
For technical support, including SN54157J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN54157J requirements.
6.How does Aetrix verify that SN54157J is sourced from the original manufacturer or authorized distributors?
All SN54157J 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 SN54157J meets industry standards.
7.What is the process for return or replacement of SN54157J?
All SN54157J units undergo pre-shipment inspection (PSI). If there is an issue with SN54157J, 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 SN54157J part is unused and in its original packaging.
Return procedure for SN54157J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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