SN3257-Q1 2:1 (SPDT), 4-channel switch with 1.8-V logic |

This product is prototype/experimental and has not been released to the market. Testing and final processes may not be complete. This product may be subject to further changes or possible discontinuation.
2:1 (SPDT), 4-channel switch with 1.8-V logic


Sample availability

Preproduction samples are available (PSN3257QDYYRQ1).  Request now

Preproduction samples are available (PSN3257QPWRQ1).  Request now


The SN3257-Q1 is an automotive grade complementary metal-oxide semiconductor (CMOS) switch that supports high speed signals with low prop delay. The SN3257-Q1 offers a 2:1 (SPDT) switch configuration with 4-channels making it ideal for various 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/output voltage of 5.5 V.

The SN3257-Q1 has an active low EN pin that is used to enable/disable all channels simultaneously. When the EN pin is LOW, one of the two switch inputs 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.


  • 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
  • High bandwidth: 900 MHz
  • Low propagation delay: 70 ps
  • Low on-resistance: 5 Ω
  • Break-before-make switching
  • 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

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Part number Order Configuration Number of channels (#) Ron (Typ) (Ohms) Bandwidth (MHz) Rating Operating temperature range (C) Package Group Input/output continuous current (Max) (mA) Supply current (Typ) (uA) Features ON-state leakage current (Max) (µA) CON (Typ) (pF)
SN3257-Q1 Order now 2:1 SPDT     4     2     900     Automotive     -40 to 125     SOT-23-THN | 16
TSSOP | 16    
25     7.5     1.8-V compatible control inputs
Fail-safe logic
Integrated pulldown resistor on logic pin
Powered-off protection
Supports SPI signals
Supports input voltage beyond supply    
0.9     8    
SN74CBTLV3257 Order now 2:1 SPDT     4     5     200     Catalog     -40 to 85     SOIC | 16
SSOP | 16
TSSOP | 16
TVSOP | 16
UQFN | 16
VQFN | 16    
128       Powered-off protection
Supports JTAG signals
Supports SPI signals    
TS3A27518E-Q1 Order now 2:1 SPDT     6     4.4     240     Automotive     -40 to 105
-40 to 85    
TSSOP | 24
WQFN | 24    
50     0.001     Powered-off protection
Supports SPI signals
Supports JTAG signals
1.8-V compatible control inputs    
7     21.5