Product details

Configuration 2:1 SPDT Number of channels (#) 4 Power supply voltage - single (V) 1.8, 2.5, 3.3 Protocols Analog, JTAG, UART, I2C, SPI, RGMII, TDM, I2S, A2B Ron (Typ) (Ohms) 2 CON (Typ) (pF) 8 ON-state leakage current (Max) (µA) 0.9 Bandwidth (MHz) 1200 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 Supply current (Typ) (uA) 7.5
Configuration 2:1 SPDT Number of channels (#) 4 Power supply voltage - single (V) 1.8, 2.5, 3.3 Protocols Analog, JTAG, UART, I2C, SPI, RGMII, TDM, I2S, A2B Ron (Typ) (Ohms) 2 CON (Typ) (pF) 8 ON-state leakage current (Max) (µA) 0.9 Bandwidth (MHz) 1200 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 Supply current (Typ) (uA) 7.5
SOT-23-THN (DYY) 16 8 mm² 4.2 x 2 TSSOP (PW) 16 22 mm² 5 x 4.4
  • 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: 1.2 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: 1.2 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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Design & development

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Evaluation board

16DYYPWEVM — Test board for SOT-23 THIN (DYY) and TSSOP (PW) packages

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. 
Not available on TI.com
Interface adapter

LEADED-ADAPTER1 — Surface mount to DIP header adapter for quick testing of TI's 5, 8, 10, 16 & 24-pin leaded packages

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.     

Not available on TI.com
Simulation model

SN3257-Q1 IBIS Model (Rev. A)

SCDM234A.ZIP (24 KB) - IBIS Model
Package Pins Download
SOT-23-THIN (DYY) 16 View options
TSSOP (PW) 16 View options

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