Produktdetails

Configuration 2:1 SPDT Number of channels 4 Power supply voltage - single (V) 1.8, 2.5, 3.3, 5 Protocols A2B, Analog, I2C, I2S, JTAG, RGMII, SPI, TDM, UART Ron (typ) (Ω) 2 CON (typ) (pF) 8 ON-state leakage current (max) (µA) 0.9 Supply current (typ) (µA) 7.5 Operating temperature range (°C) -40 to 125 Features 1.8-V compatible control inputs, Break-before-make, Fail-safe logic, Integrated pulldown resistor on logic pin, Powered-off protection, Supports input voltage beyond supply Input/output continuous current (max) (mA) 25 TI functional safety category Functional Safety-Capable Rating Automotive Drain supply voltage (max) (V) 5.5 Supply voltage (max) (V) 5.5
Configuration 2:1 SPDT Number of channels 4 Power supply voltage - single (V) 1.8, 2.5, 3.3, 5 Protocols A2B, Analog, I2C, I2S, JTAG, RGMII, SPI, TDM, UART Ron (typ) (Ω) 2 CON (typ) (pF) 8 ON-state leakage current (max) (µA) 0.9 Supply current (typ) (µA) 7.5 Operating temperature range (°C) -40 to 125 Features 1.8-V compatible control inputs, Break-before-make, Fail-safe logic, Integrated pulldown resistor on logic pin, Powered-off protection, Supports input voltage beyond supply Input/output continuous current (max) (mA) 25 TI functional safety category Functional Safety-Capable Rating Automotive Drain supply voltage (max) (V) 5.5 Supply voltage (max) (V) 5.5
SOT-23-THN (DYY) 16 8.4 mm² 4.2 x 2 TSSOP (PW) 16 32 mm² 5 x 6.4
  • Functional safety-capable
  • AEC-Q100 qualified for automotive application
    • Temperature grade 1: -40°C to +125°C, TA
  • Wide supply range: 1.5 V to 5.5 V
  • Low propagation delay: 78 ps
  • Low on-resistance: 5 Ω
  • High bandwidth: 2 GHz
  • Bidirectional signal path
  • Supports input voltage beyond supply
  • 1.8 V logic compatible
  • Integrated pull down resistor on logic pins
  • Fail-safe logic
  • Powered-off protection up to 3.6 V signals
  • Functional safety-capable
  • AEC-Q100 qualified for automotive application
    • Temperature grade 1: -40°C to +125°C, TA
  • Wide supply range: 1.5 V to 5.5 V
  • Low propagation delay: 78 ps
  • Low on-resistance: 5 Ω
  • High bandwidth: 2 GHz
  • Bidirectional signal path
  • Supports input voltage beyond supply
  • 1.8 V logic compatible
  • Integrated pull down resistor on logic pins
  • Fail-safe logic
  • Powered-off protection up to 3.6 V signals

The SN3257-Q1 is an automotive grade complementary metal-oxide semiconductor (CMOS) switch that supports high speed signals with low propagation delay. The SN3257-Q1 offers a 2:1 (SPDT) switch configuration with 4-channels making it ideal for multi-lane protocols such as SPI and I2S. The device supports bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins and can pass signals above supply up to VDD x 2, with a maximum input and output voltage of 5.5 V.

The SN3257-Q1 has an active low EN pin that is used to enable and disable all channels simultaneously. When the EN pin is LOW, one of the two switch paths is selected based on the state of SEL pin.

Powered-off protection up to 3.6 V on the signal path of the SN3257-Q1 provides isolation when the supply voltage is removed (VDD = 0 V). Without this protection feature, switches can back-power the supply rail through an internal ESD diode and cause potential damage to the system.

Fail-safe logic circuitry allows voltages on the logic control pins to be applied before the supply pin, protecting the device from potential damage. Both logic control inputs have 1.8 V logic compatible thresholds, ensuring both TTL and CMOS logic compatibility. Integrated pull down resistor on the logic pins removes external components to reduce system size and cost.

The SN3257-Q1 is an automotive grade complementary metal-oxide semiconductor (CMOS) switch that supports high speed signals with low propagation delay. The SN3257-Q1 offers a 2:1 (SPDT) switch configuration with 4-channels making it ideal for multi-lane protocols such as SPI and I2S. The device supports bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins and can pass signals above supply up to VDD x 2, with a maximum input and output voltage of 5.5 V.

The SN3257-Q1 has an active low EN pin that is used to enable and disable all channels simultaneously. When the EN pin is LOW, one of the two switch paths is selected based on the state of SEL pin.

Powered-off protection up to 3.6 V on the signal path of the SN3257-Q1 provides isolation when the supply voltage is removed (VDD = 0 V). Without this protection feature, switches can back-power the supply rail through an internal ESD diode and cause potential damage to the system.

Fail-safe logic circuitry allows voltages on the logic control pins to be applied before the supply pin, protecting the device from potential damage. Both logic control inputs have 1.8 V logic compatible thresholds, ensuring both TTL and CMOS logic compatibility. Integrated pull down resistor on the logic pins removes external components to reduce system size and cost.

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Technische Dokumentation

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Typ Titel Datum
* Data sheet SN3257-Q1 Automotive 5-V, Low Propagation Delay, 2:1 (SPDT),4-Channel Switch With 1.8 V Logic datasheet (Rev. D) PDF | HTML 03 Okt 2022
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
Application note Short to Battery Protection with TI Analog Switches and Multiplexers PDF | HTML 26 Feb 2024
Product overview How to Communicate I2S Signals Between MCU, DSPs, & Amplifiers Using Multiplexer (Rev. A) PDF | HTML 23 Jun 2023
Application brief 1.8-V Logic for Multiplexers and Signal Switches (Rev. C) PDF | HTML 26 Jul 2022
Application note Selecting the Correct Texas Instruments Signal Switch (Rev. E) PDF | HTML 02 Jun 2022
Application note Multiplexers and Signal Switches Glossary (Rev. B) PDF | HTML 01 Dez 2021
Application brief Enabling SPI-Based Flash Memory Expansion by Using Multiplexers (Rev. B) PDF | HTML 07 Okt 2021
Application brief Expanding Functionality of Cell Supervision Unit in Battery Management Systems PDF | HTML 14 Sep 2021
Application brief Eliminate Power Sequencing with Powered-off Protection Signal Switches (Rev. C) PDF | HTML 06 Jan 2021
Technical article Overcome last-minute requirement changes with SOT-23 multiplexers PDF | HTML 18 Sep 2020
Functional safety information SN3257-Q1 Functional Safety FIT Rate, FMD and Pin FMA 18 Feb 2020
EVM User's guide 16DYYPWEVM Test board for SOT-23 THIN (DYY) and TSSOP (PW) packages User's Guide 11 Nov 2019
Technical article Roll with the design punches and overcome power-sequencing challenges PDF | HTML 29 Jul 2019

Design und Entwicklung

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Evaluierungsplatine

16DYYPWEVM — Testplatine für SOT-23 THIN (TJJ)- und TSSOP (PW)-Gehäuse

The 16DYYPWEVM test board provides a dual footprint for SOT-23 THIN (DYY) and TSSOP (PW) packages.  This test board is used for quick prototyping and testing of integrated ciructs in 16 pin SOT-23 THIN (DYY) and TSSOP (PW) packages. 
Benutzerhandbuch: PDF
Schnittstellenadapter

LEADED-ADAPTER1 — Oberflächenmontierbarer DIP-Header-Adapter zur schnellen Prüfung der 5-, 8-, 10-, 16- und 24-poligen

The EVM-LEADED1 board allows for quick testing and bread boarding of TI's common leaded packages.  The board has footprints to convert TI's D, DBQ, DCT,DCU, DDF, DGS, DGV, and PW surface mount packages to 100mil DIP headers.     

Benutzerhandbuch: PDF
Simulationsmodell

SN3257-Q1 IBIS Model (Rev. A)

SCDM234A.ZIP (24 KB) - IBIS Model
Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
SOT-23-THN (DYY) 16 Ultra Librarian
TSSOP (PW) 16 Ultra Librarian

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