SN74CBTLV3257RSVR 4-Channel SPDT Analog Switch/Multiplexer – 1.65V-5.5V Wide Voltage, Low On-Resistance, Ideal for Embedded Systems, Consumer Electronics & IoT Device Signal Routing

The SN74CBTLV3257RSVR is a low-voltage 4-channel Single-Pole Double-Throw (SPDT) analog switch manufactured by Texas Instruments (TI), belonging to the CBTLV logic family--a series optimized for low-power, low-voltage systems requiring seamless signal routing. It is designed to switch both analog and digital signals in compact, power-constrained devices, making it a key component for signal multiplexing, routing, and path selection in diverse electronic applications.

As a dedicated 4-channel SPDT analog switch, the SN74CBTLV3257RSVR offers four key functional strengths:

• 4-Channel Independent SPDT Routing: Integrates 4 independent SPDT switches in a single package. Each switch enables bidirectional signal routing between one common terminal (COM) and two selectable terminals (NO/NC, Normally Open/Normally Closed). This multi-channel design reduces PCB component count and simplifies complex signal path architectures.
• Bidirectional Signal Transmission: Supports bidirectional signal flow (no fixed input/output direction) for both analog and digital signals, eliminating the need for separate switches for transmit/receive paths. It is compatible with signal types including audio, video, data buses (e.g., I2C, SPI), and sensor signals.
• Ultra-Low On-Resistance (RON): Features typical on-resistance of 3.5 Ω at 3.3 V (full temperature range), minimizing signal attenuation and distortion--critical for high-fidelity analog signals (e.g., audio) and high-speed digital signals (up to 400 MHz). The flat RON vs. voltage/current curve ensures consistent signal integrity across operating conditions.
• Power-Down High-Impedance State: Enters a high-impedance state when the supply voltage (VCC) is removed, preventing signal leakage between ports and protecting upstream/downstream components--enhancing system safety in power-cycling scenarios.

• Operating voltage (VCC): 1.65 V to 3.6 V

This wide low-voltage range aligns with standard power rails in portable electronics (e.g., 1.8 V, 2.5 V, 3.3 V) and IoT devices, ensuring compatibility with battery-powered systems and low-power microcontroller (MCU) designs.

• Static current (ICC): Maximum 1 μA at 3.3 V (no switching, full temperature range)
• Dynamic current (ICC): Typical 5 μA at 3.3 V (1 MHz switching frequency)

Ultra-low static and dynamic power draw minimizes energy usage, making it ideal for battery-powered devices (e.g., smartphones, wearables, wireless sensors) where extended battery life is critical.

• Analog signal range: Supports signals from -0.5 V to VCC + 0.5 V (overvoltage tolerance), enabling compatibility with low-amplitude analog signals (e.g., sensor outputs, audio lines).
• Digital signal support: Compatible with LVCMOS/LVTTL logic levels (1.8 V, 2.5 V, 3.3 V), ensuring seamless integration with modern digital systems.
• Switching speed: Typical propagation delay (tPD) of 6 ns at 3.3 V (load = 50 pF), enabling high-speed signal routing for time-sensitive applications (e.g., high-frequency data buses).

• Human Body Model (HBM): 2 kV (all pins)
• Machine Model (MM): 200 V (all pins)
• Charged Device Model (CDM): 500 V (all pins)

Robust multi-model ESD protection prevents damage during assembly, handling, and field operation--critical for consumer electronics and portable devices with frequent user interaction.

• Package type: VQFN-16 (Very Thin Quad Flat No-Lead, 16 pins, Surface-Mount Technology)
• Package dimensions: 3.00 mm × 3.00 mm × 0.40 mm (length × width × height)

The ultra-compact VQFN-16 package supports high-density PCB layouts, ideal for space-constrained designs (e.g., wearables, IoT modules, smartphone PCBs). It features lead-free (Pb-free) solder plating and complies with RoHS directives, meeting global environmental standards. The no-lead design also improves thermal performance and enables automated pick-and-place assembly for high-volume production.

• Commercial/Industrial temperature range: -40 °C to 85 °C

This broad range ensures reliable operation in indoor consumer electronics (e.g., smartphones, tablets), industrial automation systems (exposed to temperature swings), and outdoor IoT devices (e.g., environmental sensors), adapting to diverse environmental conditions.

The SN74CBTLV3257RSVR is widely used in signal routing applications across industries, including:

• Portable Consumer Electronics: Smartphones/tablets (audio signal switching for speakers/headphones, USB-C signal routing, sensor signal multiplexing), wearables (heart rate sensor signal path selection, display data routing).
• IoT & Wireless Devices: Wireless sensor nodes (multi-sensor signal multiplexing to reduce MCU I/O count), smart home devices (lighting control signal routing, sensor data aggregation).
• Industrial Automation: Low-power sensor modules (temperature/humidity sensor signal switching), portable test equipment (signal routing for multi-channel measurement).
• Embedded Systems: MCU-based designs (e.g., Arduino, Raspberry Pi Pico) (I/O expansion via signal multiplexing, peripheral bus routing), medical wearables (biometric sensor signal routing with low distortion).