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Texas Instruments SN74F157ANSR
- Part No.:
- SN74F157ANSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74F157ANSR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,960
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Product details
Overview
SN74F157ANSR from Texas Instruments is a quadruple 2-input data selector/multiplexer with common strobe (G) control, true output logic, buffered I/O, and 16-pin SOP-NS package. It operates across 0°C to 70°C, supports 4.5 V–5.5 V supply, delivers 20 mA low-state output drive, and achieves 6.5 ns max tPHL (A/B→Y) at 5 V/50 pF - used in digital bus routing and address/data path selection in legacy TTL-based control systems.
For engineers reviewing the SN74F157ANSR datasheet, SN74F157ANSR pinout, SN74F157ANSR application, or SN74F157ANSR equivalent, this page provides verified functional identity, validated SOP-NS package mapping, confirmed switching timing under load, true-output behavior, and direct alternatives for F-series TTL multiplexer replacement in industrial control and instrumentation designs.
Technical Context
The SN74F157ANSR implements four independent 2:1 multiplexers sharing one active-low strobe (G) and one select (A/B) input. When G is high, all Y outputs are forced low regardless of A/B or data inputs; when G is low, each Yn routes either An or Bn based on A/B state. All inputs and outputs are TTL-compatible and internally buffered.
It uses standard bipolar F-series TTL process with Schottky-clamped transistors, delivering propagation delays as low as 1.7 ns (tPHL, A/B→Y, typical) and guaranteed ≤11 ns max across temperature and voltage. Output drive capability (IOL = 20 mA, VOL ≤ 0.5 V) ensures robust fanout into standard TTL loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Quadruple 2-input data selector/multiplexer with common strobe and select lines |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL rails; no regulation required |
| Propagation Delay | tPHL(A/B→Y) ≤ 8 ns, tPLH(A/B→Y) ≤ 11 ns at VCC = 4.5–5.5 V, CL = 50 pF - ensures synchronous 4-bit word routing in ≤12 ns window |
| Output Drive | IOL = 20 mA (min), VOL ≤ 0.5 V - supports ≥10 standard TTL unit loads per output |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and test equipment |
| Input Compatibility | VIH = 2 V (min), VIL = 0.8 V (max) - fully interoperable with 74LS, 74F, and 74ALS logic families |
| Package | SOP (NS) with 16 pins, 1.27 mm pitch, 10.0 mm × 4.4 mm body - surface-mount compatible with automated assembly |
Pinout & Package
SOP-NS (NS0016A) package: 16-pin small-outline plastic, 1.27 mm lead pitch, 10.0 mm × 4.4 mm body, 2.00 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1A | Data input A for first multiplexer channel |
| 2 | 1B | Data input B for first multiplexer channel |
| 3 | 2A | Data input A for second multiplexer channel |
| 4 | 2B | Data input B for second multiplexer channel |
| 5 | 3A | Data input A for third multiplexer channel |
| 6 | 3B | Data input B for third multiplexer channel |
| 7 | 4A | Data input A for fourth multiplexer channel |
| 8 | 4B | Data input B for fourth multiplexer channel |
| 9 | GND | Ground reference for all internal circuitry and output sinks |
| 10 | 4Y | True output of fourth multiplexer channel |
| 11 | 3Y | True output of third multiplexer channel |
| 12 | 2Y | True output of second multiplexer channel |
| 13 | 1Y | True output of first multiplexer channel |
| 14 | VCC | +5 V supply connection for internal logic and output drivers |
| 15 | A/B | Common select line: selects A-inputs (low) or B-inputs (high) across all four channels |
| 16 | G | Active-low strobe: disables all outputs (forces low) when high |
Key Features
| Feature | Design Value |
|---|---|
| True-output multiplexing | Delivers non-inverted data routing - eliminates need for external inverters in signal path reconstruction |
| Common strobe control (G) | Enables simultaneous enable/disable of all four outputs - simplifies bus arbitration and power-gating logic |
| Buffered inputs and outputs | Reduces loading on upstream drivers and improves noise immunity - supports reliable operation in mixed-signal PCB environments |
| TTL-compatible voltage thresholds | Guaranteed VIH ≥ 2 V and VIL ≤ 0.8 V - ensures interoperability with legacy 74LS, 74ALS, and microcontroller GPIOs |
| High-speed F-series performance | Sub-12 ns max propagation delay at 50 pF load - meets timing budgets in 25+ MHz control bus applications |
Applications
| Industrial PLC I/O Expansion | Legacy Test Equipment Data Routing |
|---|---|
|
Use Scenario: Selecting between primary and backup sensor data streams in modular I/O backplanes. IC Role / Device Role / Timing Role: Quad 2:1 mux routes 4-bit status words from dual redundant analog-to-digital subsystems to a single controller bus. Use Value: Single SN74F157ANSR replaces four discrete gates, reduces board area by >60%, and maintains <12 ns inter-channel skew. |
Use Scenario: Switching calibration reference signals into DUT measurement paths during automated test sequences. IC Role / Device Role / Timing Role: Strobe-controlled multiplexer enables precise timing-aligned injection of known reference voltages into analog front ends. Use Value: Active-low G input synchronizes signal switching with test controller clock edges, eliminating metastability in sampling windows. |
| Microcontroller Address/Data Bus Multiplexing | Embedded Instrumentation Signal Selection |
|
Use Scenario: Sharing limited GPIO pins between address latching and peripheral data transfer in 8-bit MCU systems. IC Role / Device Role / Timing Role: Routes upper/lower nibble of 8-bit bus under A/B and G control to reduce pin count on resource-constrained controllers. Use Value: Eliminates need for external latch + decoder combo; enables full 4-bit parallel path selection with zero added latency. |
Use Scenario: Configuring multi-range analog input channels in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Selects gain-setting resistor networks or reference voltage sources for programmable amplifier stages. Use Value: Buffered I/O prevents loading of precision references; TTL-compatible inputs interface directly with low-power MCU outputs. |
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 |
|---|---|---|---|
| SN74LS157N | Slower (tPD ≤ 25 ns), lower IOL (8 mA), same pinout and logic function | Acceptable where timing margin >15 ns and fanout ≤4 TTL loads | Lower power consumption (ICC ≈ 19 mA vs. 23 mA), suitable for battery-backed control modules |
| SN74ACT157DR | CMOS technology, 5 V tolerant, higher speed (tPD ≤ 6 ns), rail-to-rail VOH/VOL | Requires level-shifting if interfacing with legacy 74F/74LS-only systems | Better noise margin and lower static current (ICC ≈ 4 µA), preferred for mixed-voltage or low-quiescent designs |
Compared with SN74F157ANSR, SN74LS157N trades speed for reduced power and cost in less timing-critical systems, while SN74ACT157DR offers superior speed and CMOS advantages but requires verification of input compatibility with existing TTL signal sources.
Availability
SN74F157ANSR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy test equipment data routing, and microcontroller address/data bus multiplexing requiring stable component supply and long-term obsolescence management.
Supply support for SN74F157ANSR 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 logic solutions with broad industrial, automotive, and communications reach.
The SN74F157ANSR belongs to TI's 74F family of fast TTL logic devices, engineered for high-speed digital control, bus management, and signal routing in commercial-grade instrumentation and automation systems.
FAQ
What is the logic function of the SN74F157ANSR?
The SN74F157ANSR is a quadruple 2-input data selector/multiplexer. It routes one of two 4-bit input sources (A or B) to four true outputs (1Y–4Y) based on the A/B select line, with all outputs disabled (forced low) when the strobe input G is high. This function is defined in the device's truth table and implemented using bipolar F-series TTL circuitry.
Does the SN74F157ANSR support 3.3 V logic interfaces?
No, the SN74F157ANSR is a 5 V-only TTL device. Its absolute maximum VCC is 7 V, but recommended operation is strictly 4.5 V–5.5 V. Input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and output levels (VOH ≥ 2.5 V, VOL ≤ 0.5 V) are specified for 5 V operation only. Direct connection to 3.3 V systems risks undriven inputs or excessive current draw and requires level translation.
What is the thermal and reliability qualification of the SN74F157ANSR?
The SN74F157ANSR is characterized for operation from 0°C to 70°C and qualified per Texas Instruments' commercial-grade F-series standards. It features a moisture sensitivity level (MSL) rating of Level-1 (unlimited floor life at ≤30°C/85% RH), peak reflow tolerance up to 260°C, and RoHS-compliant NiPdAu lead finish - ensuring robust manufacturability and field reliability in industrial control environments.
Can the SN74F157ANSR replace the SN74F157AN in a design?
Yes, the SN74F157ANSR is a direct functional and pin-compatible replacement for the SN74F157AN, differing only in package: NS (SOP) vs. N (PDIP). Both share identical logic behavior, electrical specifications, timing, and temperature range. Layout changes are required due to different footprints, but no schematic or firmware modifications are needed.
What does "NS" in SN74F157ANSR signify?
"NS" denotes the package type: SOP (Small Outline Package) with specific mechanical dimensions (NS0016A drawing), 16 pins, 1.27 mm pitch, and 10.0 mm × 4.4 mm body size. It is distinct from "D" (SOIC) and "N" (PDIP) variants. The "R" suffix indicates tape-and-reel packaging (2000 units per reel), supporting automated SMT placement.
SN74F157ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 1mA, 20mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74F157ANSR FAQ
1.How can I place an order for SN74F157ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F157ANSR 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 SN74F157ANSR reliable?
The price and inventory of SN74F157ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F157ANSR is usually 5 days.
3.What payment methods are accepted for SN74F157ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F157ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F157ANSR?
SN74F157ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F157ANSR 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 SN74F157ANSR?
For technical support, including SN74F157ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F157ANSR requirements.
6.How does Aetrix verify that SN74F157ANSR is sourced from the original manufacturer or authorized distributors?
All SN74F157ANSR 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 SN74F157ANSR meets industry standards.
7.What is the process for return or replacement of SN74F157ANSR?
All SN74F157ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74F157ANSR, 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 SN74F157ANSR part is unused and in its original packaging.
Return procedure for SN74F157ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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