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Texas Instruments SN74HC157PWTG4
- Part No.:
- SN74HC157PWTG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC157PWTG4.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,875
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Product details
Overview
SN74HC157PWTG4 from Texas Instruments is a quadruple 2-line-to-1-line data selector/multiplexer in a 16-pin TSSOP package, operating from 2V to 6V supply, delivering 11ns typical propagation delay at 6V, ±6mA output drive, and 80µA max ICC - used for synchronous 4-bit bus routing in digital logic systems.
For engineers reviewing the SN74HC157PWTG4 datasheet, SN74HC157PWTG4 pinout, SN74HC157PWTG4 application, or SN74HC157PWTG4 equivalent, key selection criteria include its shared address/strobe control architecture, TTL-compatible CMOS inputs, 50pF load compliance, and -40°C to +85°C industrial temperature range.
Technical Context
The SN74HC157PWTG4 implements four independent 2:1 multiplexers with common A/B select and active-low G strobe inputs - all outputs are forced low when G is high. It uses high-speed silicon-gate CMOS technology with standard and TTL-compatible input thresholds.
Each channel selects between two data inputs (A or B) based on the A/B signal state, while G overrides selection to assert low on all Y outputs regardless of A/B or data states - enabling synchronized bus enable/disable in multi-source systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2V to 6V - supports mixed-voltage system interfacing and battery-powered logic designs. |
| Propagation Delay (tpd) | 11ns typical at VCC = 6V, CL = 50pF - enables reliable operation in 30+ MHz digital control paths. |
| Output Drive | ±6mA at 5V - sufficient to directly drive 15 LSTTL loads without buffering. |
| Quiescent Current (ICC) | 80µA max - ensures ultra-low static power in always-on monitoring circuits. |
| Input Leakage | 1µA max - minimizes voltage divider errors in high-impedance bias networks. |
| Input Capacitance (Ci) | 10pF max - reduces loading on upstream drivers and preserves signal edge integrity. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded control and instrumentation. |
Pinout & Package
TSSOP-16 package (PW), 5.00 mm × 4.40 mm body size, 0.65 mm lead pitch, surface-mount, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A/B | Common address select input controlling all four multiplexers' data source choice (A or 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 mux channels: dual inputs per channel, single output per channel. |
| 8 | GND | Ground reference for all internal logic and output stages - must be low-impedance. |
| 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 strobe: forces all Y outputs low regardless of A/B or data states - enables global bus disable. |
| 16 | VCC | Positive supply rail - requires local 0.1µF ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2V–6V operation allows interoperability with 3.3V and 5V logic families without level shifters. |
| Strobe-controlled output disable | Single active-low G input synchronously disables all four outputs - simplifies bus arbitration logic. |
| TTL-compatible inputs | VIH/VIL thresholds match TTL levels at 4.5V and 6V supplies - ensures robust interfacing with legacy 5V systems. |
| Low dynamic power | 40pF typical power dissipation capacitance (Cpd) - minimizes switching current in high-frequency data paths. |
| CMOS input protection | Max 1µA input leakage at 6V - prevents unintended biasing in high-resistance pull-up/down configurations. |
Applications
| Industrial PLC I/O Multiplexing | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Selecting between primary and backup sensor inputs across four analog-to-digital converter channels in an automated controller. IC Role / Device Role / Timing Role: Data selector enabling real-time channel switching without interrupting sampling clock timing. Use Value: Reduces PCB component count by replacing four discrete 2:1 switches while maintaining deterministic 11ns propagation delay. | Use Scenario: Routing stimulus signals from multiple pattern generators to a DUT's input pins during functional test sequencing. IC Role / Device Role / Timing Role: Synchronized bus selector controlled by test sequencer's address and strobe lines. Use Value: Enables glitch-free signal handoff via G-input override, preventing metastability during test mode transitions. |
| Legacy System Bus Expansion | Embedded Microcontroller Peripheral Sharing |
Use Scenario: Sharing a single UART or SPI interface between two microcontrollers in a failover architecture. IC Role / Device Role / Timing Role: Bidirectional data path selector with common A/B control and strobe-enforced isolation. Use Value: Eliminates need for external bus transceivers while preserving signal integrity up to 30MHz due to 11ns tpd. | Use Scenario: Allowing one microcontroller to dynamically allocate GPIOs between two peripheral modules (e.g., display and keypad). IC Role / Device Role / Timing Role: Configurable I/O resource router managed by firmware via A/B and G signals. Use Value: Provides hardware-level peripheral arbitration with no software overhead or timing jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2:1 multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC257PW | Inverting outputs; identical pinout and electrical specs except Y = NOT(A·S + B·S̅). | Suitable where inverted logic polarity is acceptable or required in downstream logic. | Select SN74HC257PW only if system design accommodates active-low outputs without additional inversion. |
| 74LVC157APW | Lower VCC range (1.65V–5.5V); 3.3V-optimized; 5.5ns tpd at 3.3V; higher drive (±24mA). | Better suited for modern 3.3V-only systems requiring faster switching and stronger drive. | Choose 74LVC157APW for new 3.3V designs prioritizing speed and drive strength over 5V compatibility. |
Compared with SN74HC157PWTG4, SN74HC257PW provides functional equivalence with inverted outputs - requiring logic redesign - while 74LVC157APW offers superior 3.3V performance but sacrifices 6V operation and 5V TTL compatibility.
Availability
SN74HC157PWTG4 is available at Aetrix Electronics and suitable for industrial control, test equipment, and embedded peripheral sharing requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74HC157PWTG4 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.
The SN74HC157PWTG4 belongs to TI's HC logic family - designed for high-noise-immunity, low-power, pin-compatible replacements of legacy TTL devices in industrial and commercial systems.
FAQ
What is the maximum capacitive load SN74HC157PWTG4 can drive while meeting datasheet timing specifications?
The SN74HC157PWTG4 is characterized for CL = 50 pF in its switching characteristics tables. At this load, it achieves 11ns typical propagation delay at 6V. Driving larger capacitances increases tpd nonlinearly and may violate setup/hold timing - TI recommends limiting total load to ≤50pF for guaranteed spec compliance. The SN74HC157PWTG4 datasheet specifies performance under 50pF; exceeding this requires empirical validation.
Does SN74HC157PWTG4 support 3.3V operation, and what are the key electrical parameters at that voltage?
Yes, SN74HC157PWTG4 operates from 2V to 6V, including 3.3V. At VCC = 3.3V, typical propagation delay is 15ns (CL = 50pF), VOH ≥ 3.15V (IOH = −20µA), VOL ≤ 0.1V (IOL = 20µA), and ICC ≤ 160µA. Input thresholds VIH = 2.31V and VIL = 0.99V ensure compatibility with 3.3V CMOS logic families.
How does the strobe (G) input function in SN74HC157PWTG4, and what happens to outputs when G is high?
The G input is active-low. When G = high, all four Y outputs are forced low regardless of A/B state or input data - providing unconditional bus disable. This behavior is specified in the Function Table and verified across temperature and voltage ranges. The SN74HC157PWTG4 uses G for synchronous channel blanking in time-critical applications like test pattern generation.
Can unused inputs on SN74HC157PWTG4 be left floating, and what is the recommended termination?
No - unused inputs on SN74HC157PWTG4 must not be left floating. TI mandates termination to VCC or GND to prevent oscillation and excess current draw. A 10kΩ pull-up or pull-down resistor is recommended for uncommitted inputs. Floating inputs violate the Absolute Maximum Ratings and may cause erratic behavior or increased ICC in the SN74HC157PWTG4.
Is SN74HC157PWTG4 pin-compatible with other packages in the SN74HC157 family, such as SOIC or SSOP?
Yes - SN74HC157PWTG4 (TSSOP-16) shares identical pin numbering and function mapping with SN74HC157DR (SOIC-16) and SN74HC157DBR (SSOP-16), as confirmed in the Pin Functions table for "J, D, DB, N, NS, or PW package". All use the same 16-pin top-view layout with A/B on pin 1, G on pin 15, and VCC on pin 16.
SN74HC157PWTG4 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:
- Obsolete
- 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
SN74HC157PWTG4 FAQ
1.How can I place an order for SN74HC157PWTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC157PWTG4 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 SN74HC157PWTG4 reliable?
The price and inventory of SN74HC157PWTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC157PWTG4 is usually 5 days.
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SN74HC157PWTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC157PWTG4 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 SN74HC157PWTG4?
For technical support, including SN74HC157PWTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC157PWTG4 requirements.
6.How does Aetrix verify that SN74HC157PWTG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC157PWTG4 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 SN74HC157PWTG4 meets industry standards.
7.What is the process for return or replacement of SN74HC157PWTG4?
All SN74HC157PWTG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC157PWTG4, 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 SN74HC157PWTG4 part is unused and in its original packaging.
Return procedure for SN74HC157PWTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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