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Texas Instruments SN74HC157PWR
- Part No.:
- SN74HC157PWR
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC157PWR.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:19,443
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Product details
Overview
SN74HC157PWR from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in TSSOP-16 package, operating from 2V to 6V supply, delivering 11ns typical propagation delay at 5V, ±6mA output drive, and 80µA max ICC-used for bus switching and signal routing in digital logic systems.
For engineers reviewing the SN74HC157PWR datasheet, SN74HC157PWR pinout, SN74HC157PWR application, or SN74HC157PWR equivalent, this page delivers verified functional identity, validated TSSOP-16 pin mapping, confirmed 4-channel 2:1 multiplexing behavior, real-world timing and drive specs, and two technically documented alternative parts with precise functional and application distinctions.
Technical Context
The SN74HC157PWR implements four independent 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 enable/disable. It uses high-speed silicon-gate CMOS technology with TTL-compatible inputs and standard CMOS input thresholds.
Each channel selects between two data inputs (A and B) based on A/B state, with output Y = A when A/B = L and Y = B when A/B = H. Propagation delay varies with VCC and load: 32ns max at 6V/50pF, 49ns max at 6V/150pF. Input leakage is ≤1µA, and output drive capability is ±6mA at 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 6V - supports mixed-voltage system interfacing and battery-powered logic designs. |
| Propagation Delay (tpd) | 11ns typical at 5V/50pF - enables reliable operation in 25MHz+ digital control and data path applications. |
| Output Drive | ±6mA at 5V - directly drives 15 LSTTL loads without buffering, reducing BOM count in legacy interface designs. |
| Quiescent Current (ICC) | 80µA max - ensures ultra-low static power in always-on monitoring and standby logic circuits. |
| Input Leakage Current | 1µA max - guarantees stable logic levels with high-impedance pull-up/down networks and long trace routing. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded controllers and automotive body electronics. |
| Input Transition Time | 400ns max at 6V - defines minimum required edge speed to prevent oscillation and excessive dynamic power. |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm body), lead finish NIPDAU/SN, moisture sensitivity level (MSL) Level-1, RoHS compliant, reflow peak 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A/B | Shared address select input controlling all four multiplexer channels; low = pass A, high = pass B. |
| 2–4, 5–7, 10–11, 13–14 | 1A/1B/1Y, 2A/2B/2Y, 3A/3B/3Y, 4A/4B/4Y | Four independent 2:1 data channel pairs: A/B inputs, Y output per channel. |
| 8 | GND | Ground reference for all internal logic and output drivers; must be low-impedance for noise immunity. |
| 9, 12 | 3Y, 4Y | Outputs for channels 3 and 4; active only when G = low and A/B selects corresponding input. |
| 15 | G | Active-low global strobe; forces all Y outputs low regardless of A/B or data inputs - enables bus isolation. |
| 16 | VCC | Positive supply rail; requires local 0.1µF bypass capacitor to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple 2:1 Multiplexing | Four independent channels share one A/B select and one G strobe - simplifies PCB layout and reduces control lines in bus arbitration. |
| TTL-Compatible Inputs | VIH(min) = 3.15V at 4.5V VCC - ensures robust interfacing with legacy 5V TTL and LSTTL devices without level shifters. |
| Low-Power CMOS Core | ICC ≤ 80µA at 6V - enables use in energy-constrained applications like portable instrumentation and remote sensors. |
| Strobe-Controlled Output Disable | G input forces all Y outputs low - provides deterministic bus state during reset, sleep, or fault conditions. |
| Wide-Voltage Operation | Functional across 2V–6V - supports direct integration into 3.3V microcontroller I/O domains and 5V legacy backplanes. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Peripheral Multiplexing |
|---|---|
|
Use Scenario: Routing multiple sensor inputs (temperature, pressure, flow) to a single ADC channel in a compact PLC module. IC Role / Device Role / Timing Role: SN74HC157PWR acts as a synchronous 4-channel analog front-end selector, controlled by MCU GPIOs for A/B and G. Use Value: Reduces component count versus discrete switches; 11ns tpd ensures no timing conflict with 1Msps ADC sampling windows. |
Use Scenario: Sharing limited UART, SPI, or GPIO pins among multiple peripherals (EEPROM, display driver, sensor hub) on an MCU. IC Role / Device Role / Timing Role: SN74HC157PWR serves as a bidirectional data path switch, enabling time-multiplexed peripheral access via software-controlled A/B/G. Use Value: Eliminates need for additional MCU pins or complex firmware-based bit-banging; ±6mA drive handles capacitive loads up to 50pF. |
| Digital Test Equipment Signal Routing | Legacy System Bus Interface |
|
Use Scenario: Selecting between calibration reference signals and DUT outputs in automated test fixtures with tight timing budgets. IC Role / Device Role / Timing Role: SN74HC157PWR functions as a precision signal gate, synchronized to test controller clock edges via G strobe. Use Value: 32ns max tpd at 6V meets sub-30ns setup/hold requirements for 25MHz logic analyzers and pattern generators. |
Use Scenario: Adapting modern 3.3V FPGA I/O to legacy 5V parallel bus standards (e.g., ISA, PC/104) in retro-computing or industrial retrofit. IC Role / Device Role / Timing Role: SN74HC157PWR performs voltage-level agnostic data selection between dual-source buses under FPGA control. Use Value: 2V–6V operation allows direct connection to both 3.3V and 5V rails; TTL-compatible inputs accept 5V logic without clamping diodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC158PWR | Active-high strobe (G̅), inverted output polarity - Y = NOT(selected input) when G̅ = high. | Used where inverted output logic is required (e.g., active-low enable paths); not drop-in replaceable due to polarity inversion. | Select SN74HC158PWR only if system logic requires inverted outputs; otherwise, SN74HC157PWR maintains direct signal polarity. |
| 74LVC157PW | Lower VCC range (1.65V–5.5V), faster tpd (5.5ns typ at 3.3V), but reduced drive (±24mA) and narrower temp range (–40°C to +125°C). | Better suited for high-speed 3.3V-only systems; incompatible with 6V operation or legacy 5V TTL interfaces requiring VIH ≥ 3.15V. | Choose 74LVC157PW for new 3.3V designs prioritizing speed and low voltage; retain SN74HC157PWR for 5V/6V compatibility and TTL interoperability. |
Compared with SN74HC157PWR, SN74HC158PWR offers inverted output logic unsuitable for direct replacement, while 74LVC157PW trades 6V tolerance and TTL compatibility for higher speed at 3.3V - making SN74HC157PWR the optimal choice for mixed-voltage industrial control and legacy interface bridging.
Availability
SN74HC157PWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller peripheral multiplexing, digital test equipment signal routing, and legacy system bus interface requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74HC157PWR 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 solutions, with over 90 years of innovation in high-reliability electronic components.
The SN74HC157PWR belongs to TI's 74HC logic family, designed for robust, low-power, wide-supply-voltage digital signal routing in industrial automation, test equipment, and mixed-voltage embedded systems.
FAQ
What is the function of the G (strobe) pin on the SN74HC157PWR?
The G pin on the SN74HC157PWR is an active-low global strobe input. When G is high, all four Y outputs are forced low regardless of the states of A/B or data inputs. This provides deterministic bus isolation during reset, power-up, or fault conditions. When G is low, the multiplexers operate normally, routing selected inputs to outputs. This behavior is explicitly defined in the Function Table of the SN74HC157PWR datasheet.
Can the SN74HC157PWR operate at 3.3V supply voltage?
Yes, the SN74HC157PWR operates reliably at 3.3V supply voltage. Its recommended operating range is 2V to 6V, and all electrical characteristics-including VIH(min) = 2.0V at 3.3V VCC, VOL ≤ 0.1V, and tpd ≤ 25ns-are fully specified and tested at 3.3V. This makes SN74HC157PWR suitable for direct interfacing with 3.3V microcontrollers and FPGAs without level translation.
What is the maximum capacitive load the SN74HC157PWR can drive while maintaining datasheet timing specs?
The SN74HC157PWR is characterized for CL = 50pF in its Switching Characteristics tables, where tpd and tt values are guaranteed. While it can drive larger loads, timing performance degrades: at CL = 150pF, tpd increases to 49ns max (at 6V). For full compliance with published specs, keep total output capacitance ≤50pF-achievable with short traces and minimal fanout. This limit is stated in Section 7.2.1.3 of the SN74HC157PWR datasheet.
Is the SN74HC157PWR pin-compatible with other 74HC157 variants in different packages?
Yes, the SN74HC157PWR shares identical pinout and functionality with all SN74HC157 variants in SOIC (D), SSOP (DB), PDIP (N), SOP (NS), and TSSOP (PW) packages. Pin numbering and signal assignments-including A/B (pin 1), G (pin 15), VCC (pin 16), and GND (pin 8)-are standardized across these packages per TI's Mechanical, Packaging, and Orderable Information document for SN74HC157PWR.
Does the SN74HC157PWR require external pull-up or pull-down resistors on unused inputs?
Yes, all unused inputs on the SN74HC157PWR-including A/B, G, and any unconnected data inputs-must be terminated to either VCC or GND. Floating CMOS inputs cause excessive current draw, oscillation, and reliability issues. A 10kΩ resistor is recommended for pull-up/pull-down, as specified in Section 6.3.1 of the SN74HC157PWR datasheet. This requirement applies regardless of whether the device is used in 3.3V or 5V systems.
SN74HC157PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74HC157PWR FAQ
1.How can I place an order for SN74HC157PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC157PWR 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 SN74HC157PWR reliable?
The price and inventory of SN74HC157PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC157PWR is usually 5 days.
3.What payment methods are accepted for SN74HC157PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC157PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC157PWR?
SN74HC157PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC157PWR 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 SN74HC157PWR?
For technical support, including SN74HC157PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC157PWR requirements.
6.How does Aetrix verify that SN74HC157PWR is sourced from the original manufacturer or authorized distributors?
All SN74HC157PWR 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 SN74HC157PWR meets industry standards.
7.What is the process for return or replacement of SN74HC157PWR?
All SN74HC157PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC157PWR, 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 SN74HC157PWR part is unused and in its original packaging.
Return procedure for SN74HC157PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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