SN3257QPWRQ1

The SN3257-Q1 is an automotive-grade CMOS switch supporting high-speed signals with low propagation delay. The SN3257-Q1 provides a 4-channel 2:1 (SPDT) switch configuration, making it ideal for per-channel protocols such as SPI and I2S. This device supports bidirectional analog and digital signals on the source (SxA, SxB) and drain (Dx) pins, and is capable of passing signals above the supply voltage (up to VDD x 2), with a maximum input and output voltage of 5.5V. The SN3257-Q1 features an active-low EN pin for simultaneously enabling and disabling all channels. When the EN pin is low, one of two switch paths is selected based on the state of the SEL pin. The SN3257-Q1's off-state protection up to 3.6V on the signal path provides isolation when the supply voltage is removed (VDD = 0V). Without this protection, the switch could back-power the supply rail through internal ESD diodes, potentially damaging the system. The failsafe logic circuit allows voltage to be applied to the logic control pins before the supply pin, protecting the device from potential damage. Both logic control inputs feature 1.8V logic-compatible thresholds, ensuring TTL and CMOS logic compatibility. Integrated pull-down resistors on the logic pins eliminate the need for external components, reducing system size and cost.

Applications

• SPI multiplexing
• I2S multiplexing
• eSIM multiplexing
• eMMC multiplexing
• Flash memory sharing
• Battery Management System (BMS)
• Telematics Control Unit (TCU)
• Smart telematics gateway
• Rear seat entertainment system
• Digital cockpit processing unit
• Automotive head unit
• Automotive navigation
• ADAS domain controller
• Surround view system ECU
• On-Board Charger (OBC) and wireless charger

Key features

• Functional Safety documentation available to aid functional safety system design
• AEC-Q100 qualified for automotive applications
• Temperature Grade 1: –40°C to +125°C, TA
• Wide supply voltage range: 1.5V to 5.5V
• Low propagation delay: 78 ps
• Low on-resistance: 5Ω
• High bandwidth: 2 GHz
• Bidirectional signal path
• Supports input voltages beyond supply rail
• 1.8V logic level compatible
• Integrated pull-down resistors on logic pins
• Fail-safe logic
• Power-off protection for signals up to 3.6V