Introduction to the TS3A27518ETRTWRQ1 component

Creation Date

1. Component Overview: Core Positioning of 6-Bit 2-to-1 Multiplexer

TS3A27518ETRTWRQ1 is an automotive-grade 6-bit 2-to-1 multiplexer/demultiplexer launched by Texas Instruments (TI). Specifically designed for high-reliability signal routing scenarios, it enables bidirectional transmission of both digital and analog signals, with a maximum transmission voltage reaching the supply voltage (V+). Its core value lies in addressing the signal switching needs of multi-device systems through integrated design, making it particularly suitable for expansion applications of 6-bit interfaces such as SDIO, while meeting the strict environmental adaptability requirements of automotive electronics.

This component adopts a 24-pin WQFN package (4mm × 4mm) with a surface area of only 16mm². Compared with TSSOP-packaged products in the same series, it reduces the volume by 68%, making it especially suitable for compact space designs like automotive electronics. Currently, the product is in the Active lifecycle, offering tape-and-reel packaging to support large-scale mass production applications.


2. Analysis of Core Technical Characteristics and Parameters

(1) Basic Electrical Parameters

Parameter Category Specific Specification Technical Significance Supply Voltage Range 1.65V~3.6V Single Supply Compatible with 1.8V/2.5V/3.3V mainstream system voltages Bandwidth 240MHz (3dB) Supports high-speed rail-to-rail signal processing On-Resistance 6.2Ω (Typical) Low signal attenuation, high transmission efficiency Switching Capacitance 21.5pF (Typical) Reduces high-frequency signal distortion Operating Temperature -40℃~105℃ Meets Automotive Electronics Grade 2 temperature standards Quiescent Current 40nA (Typical) Ultra-low power consumption, suitable for battery-powered scenarios(2) Automotive-Grade Reliability Design

  1. Compliance Certification: Complies with the AEC-Q100 standard and has passed HBM ESD H2 Class and CDM ESD C3B Class tests. The NC/NO ports can withstand ±6kV contact discharge (IEC 61000-4-2), ensuring excellent stability in the automotive electromagnetic environment.
  2. Protection Mechanisms: Equipped with power-off isolation function—when V+=0, all outputs automatically enter a high-impedance mode to avoid signal surges during device plugging/unplugging; the “break-before-make” design prevents signal conflicts during channel switching.
  3. Logic Compatibility: The control pins support 1.8V logic thresholds and are backward compatible with 2.5V/3.3V systems, enabling adaptation to different main control chips without additional level-shifting circuits.

(3) Flexible Control Architecture

The component is equipped with 2 independent control pins (C1, C2) and 1 global enable pin (EN):

  • C1 controls signal switching for channels 1-3, and C2 controls signal switching for channels 4-6, enabling synchronous or partitioned switching of 6-bit signals;
  • When the EN pin is inactive, all channels are in the off state, facilitating system sleep or fault protection.
  • This design allows the component to not only adapt to the synchronous expansion of 6-bit signals in SDIO interfaces but also realize partitioned routing of audio and video signals.

3. Typical Application Scenarios and Solutions

(1) In-Vehicle Storage Expansion Systems

The SDIO interface includes 6-bit signals: CMD (command), CLK (clock), and Data0-3 (data), which perfectly match the channel configuration of TS3A27518ETRTWRQ1. In in-vehicle infotainment systems, this component can expand a single SD host controller to multiple storage peripherals, enabling:

  • Seamless switching between navigation map SD cards and entertainment music SD cards;
  • Time-sharing data reading from dashcams and in-vehicle USB drives;
  • Its 240MHz bandwidth can support the high-speed transmission requirements of UHS-I class SD cards, and the crosstalk suppression capability (-62dB @ 10MHz) ensures a data transmission bit error rate lower than 10⁻¹².

(2) In-Vehicle Audio and Video Routing

In intelligent cockpit systems, the component can realize switching and distribution of multi-source audio and video signals:

  • Video signal switching between the central control screen and rear-seat entertainment screens, supporting high-definition analog video transmission;
  • Audio input selection for in-vehicle audio systems (Bluetooth module/radio/USB player);
  • The dual-control pin design allows the 6-bit channels to be divided into two groups for independent control—for example, 3 channels for video signal transmission and 3 channels for audio signal transmission, simplifying the complexity of system wiring.

(3) Industrial and Consumer Electronics Expansion

  1. PC VGA Video Multiplexing: In industrial monitors, the component enables switching of two VGA signals (with 2 channels allocated for each of RGB), and its 240MHz bandwidth can support 1920×1080@60Hz high-definition display;
  2. Docking Station Interface Expansion: In laptop docking stations, it is used for signal multiplexing between SD card slots and eSATA interfaces, reducing the occupancy rate of motherboard interfaces.

4. Selection and Alternative Considerations

Compared with other products in the same series, TS3A27518ETRTWRQ1 has the following core advantages:

  • Its operating temperature range (-40℃~105℃) is wider than that of TS3A27518EIRTWRQ1 (-40℃~85℃), making it more suitable for high-temperature environments near the engine compartment;
  • The thermal performance of the WQFN package is superior to that of the TSSOP-packaged TS3A27518EPWR, ensuring better stability in high-load scenarios.
  • If further improvement of ESD protection level is required, TI’s TS3A27520E-Q1 model (±8kV contact discharge) can be considered, but trade-offs between cost and package size changes need to be made.