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


Package | PIN: TSSOP (PW) | 16
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $0.85
10-24 $0.76
25-99 $0.70
100-249 $0.60
250-499 $0.56
500-749 $0.45
750-999 $0.36
1000+ $0.32


  • AEC-Q100 qualified for automotive application
    • Temperature grade 1: -40°C to +125°C, TA
  • Wide supply range: 1.5 V to 3.6 V
  • High bandwidth: 900 MHz
  • Low on-capacitance: 8 pF
  • 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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Texas Instruments  PSN3257QPWRQ1

The SN3257-Q1 is an automotive grade complementary metal-oxidesemiconductor (CMOS) switch that supports high speed signals with low prop delay. TheSN3257-Q1 offers 2:1 (SPDT) switch configuration with 4-channels making it idealfor various protocols such as SPI and I2S. The device supports bidirectional analog and digitalsignals on the source (SxA, SxB) and drain (Dx) pins and can pass signals above supply up toVDD x 2, with a maximum input/output voltage of 5.5 V.

The SN3257-Q1 has an active low EN pin that isused 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-Q1provides isolation when the supply voltage is removed (VDD = 0 V). Withoutthis protection feature, switches can back-power the supply rail through an internal ESD diode andcause potential damage to the system.

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