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Texas Instruments SN74HCS157QPWRQ1
- Part No.:
- SN74HCS157QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCS157QPWRQ1.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:118
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Product details
Overview
SN74HCS157QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified quadruple 2-to-1 CMOS multiplexer with Schmitt-trigger inputs, operating from 2 V to 6 V, delivering ±7.8-mA output drive at 6 V and typical ICC of 100 nA, used for data routing in vehicle body control modules and infotainment bus switching.
For engineers reviewing the SN74HCS157QPWRQ1 datasheet, SN74HCS157QPWRQ1 pinout, SN74HCS157QPWRQ1 application, or SN74HCS157QPWRQ1 equivalent, key selection criteria include automotive temperature range (–40°C to +125°C), Schmitt-trigger noise immunity, TSSOP-16 wettable flank compatibility, and quad-channel synchronous select control via shared A/B and G inputs.
Technical Context
The SN74HCS157QPWRQ1 implements four independent 2:1 multiplexers sharing a common address select (A/B) and active-low strobe (G) input; all outputs are forced low when G is high. Its asynchronous operation ensures deterministic Y = A or Y = B based solely on A/B state when G is low.
Schmitt-trigger inputs provide hysteresis (ΔVT = 0.6 V min at 6 V), enabling reliable operation with slow-rising/falling signals and rejecting noise up to ±300 mV peak-to-peak. Balanced CMOS push-pull outputs support bidirectional current sourcing/sinking up to ±7.8 mA at 6 V with VOH ≥ 5.4 V and VOL ≤ 0.33 V under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports direct interface with 3.3-V and 5-V automotive microcontrollers without level shifting |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and cabin ECUs |
| Output Drive Strength | ±7.8 mA at 6 V - sufficient to drive multiple CMOS inputs or small LED indicators directly |
| Input Hysteresis (ΔVT) | 0.6 V (min) at 6 V - rejects noise spikes up to ±300 mV and tolerates RC-filtered or mechanically debounced inputs |
| Quiescent Supply Current | 100 nA typical - enables always-on monitoring circuits with negligible battery drain |
| Propagation Delay | 7 ns (typ) at 6 V - supports data switching up to 29 MHz in high-speed bus arbitration |
| Input Leakage Current | ±100 nA max - allows high-impedance pull-up/down biasing without significant voltage shift |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm) with wettable flanks for enhanced AOI solder-joint inspection; thermal pad not present in PW variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A/B | Shared address select input controlling all four multiplexers; logic HIGH selects B inputs, LOW selects A inputs |
| 2–4, 5–7, 10–11, 13–14 | 1A/1B/1Y, 2A/2B/2Y, 3A/3B/3Y, 4A/4B/4Y | Four independent 2:1 channel pairs - each Y output reflects selected A or B input when G is low |
| 8 | GND | Ground reference for all logic and power domains; must be low-impedance connection |
| 9, 12 | 3Y, 4Y | Outputs for channels 3 and 4 - identical electrical behavior to 1Y and 2Y |
| 15 | G | Active-low strobe - forces all Y outputs LOW regardless of A/B or data inputs when asserted HIGH |
| 16 | VCC | Positive supply rail - requires local 0.1-μF bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use across –40°C to +125°C ambient, eliminating need for external derating or validation |
| Schmitt-trigger input hysteresis | Enables robust operation with slow-switching sensors (e.g., door latch switches) and noisy harness environments without added RC filtering |
| Wettable flank TSSOP package | Supports automated optical inspection of side-solder fillets, improving manufacturing yield and field-reliability traceability |
| Ultra-low ICC (100 nA typ) | Permits integration into always-on wake-up logic paths without compromising vehicle battery standby life |
| Shared A/B and G control | Reduces PCB routing complexity versus discrete muxes - single select line manages all four data paths synchronously |
Applications
| Body Control Module Data Routing | Infotainment Source Switching |
|---|---|
Use Scenario: Selecting between two CAN transceiver diagnostic ports or dual-sensor inputs (e.g., left/right mirror fold sensors) in a centralized body controller. IC Role / Device Role / Timing Role: Quad 2:1 data selector enabling single MCU GPIO to manage four independent signal pairs without software overhead. Use Value: Reduces MCU pin count by 4× versus individual analog switches; Schmitt inputs eliminate need for external debounce circuitry. | Use Scenario: Dynamically routing audio/video data streams between primary head unit and backup camera or Bluetooth module in a multi-source infotainment system. IC Role / Device Role / Timing Role: Synchronous bus multiplexer ensuring glitch-free handoff between sources using shared A/B and strobe timing. Use Value: Enables zero-latency source switching with no metastability risk due to CMOS-level propagation matching across all four channels. |
| Instrument Cluster Display Interface | ADAS Sensor Signal Conditioning |
Use Scenario: Multiplexing redundant tachometer or speed sensor signals before feeding to cluster MCU for fail-safe comparison. IC Role / Device Role / Timing Role: Fault-tolerant data selector providing hardware-level redundancy voting path with strobe-enabled isolation. Use Value: G input allows immediate blanking of display outputs during ECU reset or fault condition - critical for ASIL-B compliance. | Use Scenario: Conditioning slow-rising signals from parking ultrasonic transducers or rain/light sensors before ADC sampling. IC Role / Device Role / Timing Role: Input buffer with noise-immune thresholding, converting marginal analog-derived logic levels into clean digital signals. Use Value: ΔVT ≥ 0.6 V prevents false triggering from EMI coupling on long sensor harnesses - validated per ISO 11452-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCS157DQ1 | SOIC-16 package (9.9 mm × 3.9 mm); higher RθJA (122.2°C/W) vs. TSSOP's 141.2°C/W; same electrical specs | Better suited for through-hole prototyping or legacy board rework where SOIC footprint exists | Select when mechanical compatibility with existing SOIC layouts is required; thermal performance marginally lower |
| SN74HCS157WBQ1 | WQFN-16 (3.6 mm × 2.6 mm) with wettable flanks and lower RθJA (97.3°C/W); identical logic and timing | Preferred for space-constrained ADAS domain controllers requiring high-density routing and AOI-verifiable solder joints | Choose for new designs targeting miniaturization and automated assembly traceability |
Compared with SN74HCS157DQ1 and SN74HCS157WBQ1, the SN74HCS157QPWRQ1 offers optimal balance of manufacturability (TSSOP wettable flanks), thermal performance, and legacy PCB compatibility - making it the default choice for mid-volume automotive modules where SOIC is oversized and WQFN requires layout redesign.
Availability
SN74HCS157QPWRQ1 is available at Aetrix Electronics and suitable for automotive body control units, infotainment switching systems, and instrument cluster interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCS157QPWRQ1 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 automotive-grade logic solutions with over 50 years of automotive qualification experience.
The SN74HCS157QPWRQ1 belongs to TI's HCS logic family designed specifically for automotive signal routing applications demanding AEC-Q100 compliance, ultra-low power, and noise-immune interfacing in harsh electrical environments.
FAQ
What automotive qualification level does the SN74HCS157QPWRQ1 meet?
The SN74HCS157QPWRQ1 is AEC-Q100 qualified to Grade 1, supporting operation from –40°C to +125°C ambient temperature and meeting HBM ESD Level 2 (±4 kV) and CDM Level C6 (±1.5 kV). This certification covers the full device, including its TSSOP-16 wettable flank package, and is documented in TI's official SCLS820A datasheet revision December 2021.
How does the Schmitt-trigger input improve noise immunity in the SN74HCS157QPWRQ1?
The SN74HCS157QPWRQ1 uses Schmitt-trigger inputs with hysteresis (ΔVT ≥ 0.6 V at 6 V), meaning the input threshold rises to VT+ (~4.2 V) when transitioning HIGH and falls to VT– (~3.0 V) when transitioning LOW. This 1.2-V window rejects noise spikes up to ±600 mV peak-to-peak and accommodates slow edges from mechanical switches or long cables - a capability confirmed in Section 6.5 of the SN74HCS157QPWRQ1 datasheet.
Can the SN74HCS157QPWRQ1 drive standard TTL loads?
Yes, the SN74HCS157QPWRQ1 can drive standard TTL loads: at 5 V supply, it delivers VOH ≥ 4.3 V and VOL ≤ 0.3 V while sourcing/sinking 6 mA, exceeding TTL VIH (2 V) and VIL (0.8 V) thresholds with margin. Its ±7.8-mA drive at 6 V further ensures compatibility with legacy automotive TTL interfaces, as verified in Table 6-5 of the SN74HCS157QPWRQ1 electrical characteristics.
What is the function of the G (strobe) pin on the SN74HCS157QPWRQ1?
The G pin on the SN74HCS157QPWRQ1 is an active-high strobe that forces all four Y outputs LOW regardless of the states of A/B or data inputs. When G = HIGH, outputs are unconditionally low; when G = LOW, outputs reflect the selected A or B inputs per the A/B control. This feature enables hardware-level output blanking during system reset or fault conditions - a behavior explicitly defined in the Function Table (Table 8-1) of the SN74HCS157QPWRQ1 datasheet.
Is a decoupling capacitor required for the SN74HCS157QPWRQ1, and what value is recommended?
Yes, a 0.1-μF ceramic decoupling capacitor is required between VCC and GND for the SN74HCS157QPWRQ1, placed physically adjacent to pins 16 and 8. This mitigates supply transients during output switching and ensures stable operation across the full 2–6 V range. TI's Layout Example (Figure 11-1) and Power Supply Recommendations section confirm this value is mandatory - not optional - for automotive-grade reliability in the SN74HCS157QPWRQ1 design.
SN74HCS157QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCS
- 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:
- 4
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74HCS157QPWRQ1 FAQ
1.How can I place an order for SN74HCS157QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS157QPWRQ1 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 SN74HCS157QPWRQ1 reliable?
The price and inventory of SN74HCS157QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS157QPWRQ1 is usually 5 days.
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Once your SN74HCS157QPWRQ1 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 SN74HCS157QPWRQ1?
For technical support, including SN74HCS157QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS157QPWRQ1 requirements.
6.How does Aetrix verify that SN74HCS157QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74HCS157QPWRQ1 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 SN74HCS157QPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74HCS157QPWRQ1?
All SN74HCS157QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS157QPWRQ1, 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 SN74HCS157QPWRQ1 part is unused and in its original packaging.
Return procedure for SN74HCS157QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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