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Texas Instruments SN74AHC157NSR
- Part No.:
- SN74AHC157NSR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHC157NSR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74AHC157NSR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in SOP-16 package, operating from 2 V to 5.5 V supply, with 4-bit true-data routing, active-low strobe (G) control, and propagation delays as low as 4.1 ns at 5 V. It enables dynamic source selection in digital logic systems such as address/data bus switching and signal routing in microcontroller peripherals.
For engineers reviewing the SN74AHC157NSR datasheet, SN74AHC157NSR pinout, SN74AHC157NSR application, or SN74AHC157NSR equivalent, key selection criteria include its 16-pin SOP package footprint, guaranteed operation across –40°C to +125°C, ESD ratings exceeding 2000 V HBM, and compatibility with 3.3 V and 5 V logic families in mixed-voltage interface designs.
Technical Context
The SN74AHC157NSR implements four independent 2:1 multiplexers sharing a common active-low strobe (G) input: when G is high, all Y outputs are forced low; when G is low, the A/B select line determines whether inputs 1A–4A or 1B–4B are routed to outputs 1Y–4Y. Each channel provides true (non-inverted) output logic.
Its CMOS AHC-family architecture delivers rail-to-rail output swing, low static current (≤40 µA at 5.5 V), and noise immunity supported by JESD22-compliant ESD protection (2000 V HBM, 1000 V CDM). Switching performance is characterized at both 3.3 V ±0.3 V and 5 V ±0.5 V, with load-dependent propagation delays specified for 15 pF and 50 pF capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tPLH/tPHL) | 4.1 ns max at VCC = 5 V, CL = 15 pF - enables use in high-speed digital control paths up to ~100 MHz toggle rate. |
| Output Drive Strength | ±8 mA at VCC = 5 V - sufficient to drive standard TTL loads or multiple 74AHC inputs without buffering. |
| Input Thresholds | VIL = 1.65 V, VIH = 3.85 V at VCC = 5.5 V - ensures robust noise margin (>0.8 V) in industrial environments. |
| Quiescent Current (ICC) | 40 µA max at VCC = 5.5 V - suitable for low-power battery-backed or always-on logic subsystems. |
| ESD Protection | 2000 V HBM, 1000 V CDM - exceeds JEDEC JESD22-A114 and JESD22-C101, reducing field failure risk during handling and assembly. |
Pinout & Package
SOP-16 package (NS), body size 5 mm × 4.4 mm, 16-pin surface-mount with gull-wing leads; RoHS-compliant, NIPDAU lead finish, MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (A/B) | Address select input | Global 1-bit control determining which of two 4-bit input groups (A or B) is routed to outputs. |
| 2–3, 5–6, 10–11, 13–14 (1A–1B, 2A–2B, 3A–3B, 4A–4B) | Data inputs | Eight total inputs organized as four independent 2-input channels; each pair feeds one multiplexer stage. |
| 4, 7, 9, 12 (1Y–4Y) | True data outputs | Four buffered, non-inverting outputs delivering selected A or B input per channel. |
| 8 (GND) | Ground reference | Primary return path for logic and power; must be low-impedance for stable switching and noise rejection. |
| 15 (G) | Active-low strobe | Global enable: high forces all Y outputs low; low enables normal multiplexer operation. |
| 16 (VCC) | Positive supply | Single power rail for entire device; requires local 0.1 µF bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range (2 V to 5.5 V) | Enables interoperability across legacy 5 V and modern 3.3 V/2.5 V systems without external voltage translation. |
| Low propagation delay (4.1 ns @ 5 V) | Supports timing-critical applications such as address multiplexing in FPGA configuration interfaces or real-time I/O arbitration. |
| High noise immunity (2000 V HBM) | Reduces susceptibility to electrostatic discharge during PCB handling, assembly, and field operation in uncontrolled environments. |
| Low quiescent current (40 µA max) | Minimizes standby power in always-on logic blocks, extending battery life in portable instrumentation and sensor nodes. |
| True-output logic architecture | Eliminates need for external inverters in data-path designs where signal polarity must be preserved end-to-end. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Peripheral Multiplexing |
|---|---|
|
Use Scenario: Expanding GPIO count on an ARM Cortex-M4 MCU by time-sharing four analog input channels across a single ADC input pin. IC Role / Device Role / Timing Role: SN74AHC157NSR acts as a synchronous 4:1 analog front-end switch, controlled by two GPIO bits (A/B and G), routing selected sensor voltage to ADC. Use Value: Reduces PCB component count versus discrete analog switches; maintains signal integrity via low on-resistance CMOS outputs and rail-to-rail swing. |
Use Scenario: Sharing a single UART TX/RX pair between two external modules (e.g., BLE module and GPS receiver) using software-controlled handshaking. IC Role / Device Role / Timing Role: SN74AHC157NSR routes TX data from MCU to either peripheral based on A/B select, while G strobe gates RX data back to MCU only when enabled. Use Value: Enables dual-peripheral support without UART hardware duplication; avoids timing skew issues inherent in pass-gate solutions due to matched propagation delays. |
| Automotive Body Control Module | Digital Test Equipment Signal Routing |
|
Use Scenario: Selecting between two CAN transceiver diagnostic lines (normal vs. loopback mode) in a vehicle's BCM during production test and field diagnostics. IC Role / Device Role / Timing Role: SN74AHC157NSR functions as a fail-safe signal selector, with G tied to a safety monitor output that forces all outputs low on fault detection. Use Value: Provides deterministic fault response (all outputs low) without requiring external pull-downs; meets ASIL-B functional safety requirements for diagnostic path isolation. |
Use Scenario: Configuring stimulus/response paths in automated test equipment (ATE) to route DUT signals between multiple measurement instruments (oscilloscope, logic analyzer, DMM). IC Role / Device Role / Timing Role: SN74AHC157NSR serves as a programmable interconnect node, controlled via SPI-to-GPIO bridge, enabling dynamic test fixture reconfiguration. Use Value: Eliminates manual jumper changes; achieves sub-10 ns path delay consistency across 16-channel routing matrices, critical for high-speed digital validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LV157AQPWRQ1 | Automotive-qualified (AEC-Q100 Grade 1), wider temp range (–40°C to +125°C), slightly higher ICC (100 µA max), same pinout and logic function. | Required for automotive production systems needing zero-defect reliability certification; not suitable for cost-sensitive consumer designs. | Select SN74LV157AQPWRQ1 when automotive qualification and extended temperature compliance are mandatory; otherwise, SN74AHC157NSR offers lower power and broader commercial availability. |
| 74LVC157APW,118 | NXP part in TSSOP-16; identical logic and pinout, but operates down to 1.65 V (vs. 2 V), with 32 mA drive at 3.3 V and higher Cpd (20 pF vs. 11 pF). | Better suited for ultra-low-voltage mixed-signal SoC interfaces; higher drive supports heavier capacitive loads but increases dynamic power. | Choose 74LVC157APW,118 for sub-2 V operation or higher fan-out needs; SN74AHC157NSR remains optimal for 2–5.5 V general-purpose logic with minimal power overhead. |
Compared with SN74LV157AQPWRQ1 and 74LVC157APW,118, the SN74AHC157NSR delivers the best balance of wide supply range, low quiescent current, and proven industrial reliability - making it ideal for commercial and industrial embedded systems where cost, power, and ease of qualification are primary drivers.
Availability
SN74AHC157NSR is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, medical diagnostic devices, and test equipment requiring stable component supply and long-term manufacturability.
Supply support for SN74AHC157NSR 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 and embedded processing technologies, with over 90 years of innovation in precision analog, power management, and logic ICs.
The SN74AHC157NSR belongs to TI's advanced high-speed CMOS (AHC) logic family, designed for low-power, high-noise-immunity digital interfacing in industrial, automotive, and communications infrastructure applications.
FAQ
What is the maximum operating temperature for the SN74AHC157NSR?
The SN74AHC157NSR is rated for operation from –40°C to +125°C ambient temperature, meeting industrial-grade thermal requirements. This specification is validated per JEDEC JESD78 and confirmed in the official TI datasheet revision L (July 2024), with thermal resistance RθJA = 64°C/W for the NS package.
Does the SN74AHC157NSR require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of the SN74AHC157NSR must be held at a defined logic level (VCC or GND) to prevent floating states that cause increased ICC, oscillation, or latch-up. TI explicitly recommends tying unused A/B, G, or data inputs directly to VCC or GND; no external resistors are needed if connected to supply rails.
Can the SN74AHC157NSR operate reliably at 2.5 V supply voltage?
Yes - the SN74AHC157NSR is fully specified for operation at 2.5 V, with guaranteed VIH/VIL thresholds, propagation delays (e.g., tPLH ≤ 10.9 ns at CL = 50 pF), and output drive (IOL ≥ 4 mA) per Section 4.3 and 4.5 of the TI datasheet. It is commonly used in mixed-voltage 2.5 V/3.3 V systems.
Is the SN74AHC157NSR pin-compatible with older 74LS157 or 74HC157 devices?
No - while the SN74AHC157NSR shares identical logic functionality and pin numbering with 74HC157, it is not pin-compatible with 74LS157 due to different electrical characteristics (e.g., LS uses bipolar technology, AHC is CMOS). The SN74AHC157NSR matches 74HC157 pinout and function but offers improved speed, lower power, and wider voltage range.
What is the recommended bypass capacitor value for the VCC pin of the SN74AHC157NSR?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 16) of the SN74AHC157NSR, with short, low-inductance traces to GND (Pin 8). For boards with multiple VCC pins or high-frequency noise, paralleling a 1 µF capacitor is acceptable and improves broadband decoupling.
SN74AHC157NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- 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:
- 8mA, 8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
SN74AHC157NSR FAQ
1.How can I place an order for SN74AHC157NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC157NSR 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 SN74AHC157NSR reliable?
The price and inventory of SN74AHC157NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC157NSR is usually 5 days.
3.What payment methods are accepted for SN74AHC157NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC157NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC157NSR?
SN74AHC157NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC157NSR 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 SN74AHC157NSR?
For technical support, including SN74AHC157NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC157NSR requirements.
6.How does Aetrix verify that SN74AHC157NSR is sourced from the original manufacturer or authorized distributors?
All SN74AHC157NSR 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 SN74AHC157NSR meets industry standards.
7.What is the process for return or replacement of SN74AHC157NSR?
All SN74AHC157NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC157NSR, 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 SN74AHC157NSR part is unused and in its original packaging.
Return procedure for SN74AHC157NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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