Texas Instruments TS3A27518EPWR

Overview

TS3A27518EPWR from Texas Instruments is a bidirectional 6-channel 1:2 analog multiplexer-demultiplexer optimized for qSPI, SD/SDIO, and multimedia card interfaces. It operates from 1.65 V to 3.6 V, delivers 240 MHz bandwidth, –62 dB OFF isolation, 21.5 pF typical ON capacitance, and supports 1.8-V logic control with 3.6-V tolerant inputs-enabling direct integration in low-voltage mobile and embedded host controllers routing CMD/CLK/Data[0:3] signals.

For engineers reviewing the TS3A27518EPWR datasheet, TS3A27518EPWR pinout, TS3A27518EPWR application, or TS3A27518EPWR equivalent, key selection criteria include its IEC 61000-4-2 ±6-kV contact ESD rating on NC/NO ports, power-down isolation at VCC = 0, break-before-make timing (≤58 ns), and dual-control-pin architecture enabling independent switching of three 1:2 paths per control line.

Technical Context

The TS3A27518EPWR implements six independent bidirectional analog switches with separate normally closed (NC) and normally open (NO) paths per channel, controlled by two digital inputs (IN1, IN2) and an enable pin (EN). Its CMOS transmission-gate topology supports rail-to-rail signal handling up to VCC in either direction, with no internal level-shifting circuitry.

Each switch exhibits matched ON-resistance flatness (≤7.3 Ω max at 1.65 V), low charge injection (0.21 pC typical at 1.8 V), and maintains –60 dB minimum OFF isolation across 1.8–3.3 V supply range. The device achieves high-speed performance via low parasitic capacitance (21.5 pF ON, 9–13.5 pF OFF) and fast switching (tON ≤ 56.7 ns, tOFF ≤ 31.2 ns at 1.8 V).

Key Specifications

Pinout & Package

TS3A27518EPWR is packaged in a 24-pin WQFN (RTW) measuring 4.00 mm × 4.00 mm with exposed thermal pad. This RoHS-compliant, space-efficient package supports high-density PCB layouts and enhanced thermal dissipation (RθJA = 40.7°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with TMUX1574PWR and SN74CBT3244PWR, TS3A27518EPWR uniquely combines 6-channel 1:2 topology, 240 MHz bandwidth, ±6-kV IEC ESD, and true power-down isolation-making it the only option qualified for SDIO/qSPI host-side peripheral expansion in portable and industrial equipment.

Availability

TS3A27518EPWR is available at Aetrix Electronics and suitable for SD/SDIO dual-card adapters, qSPI flash/secure-element selectors, audio/video routing modules, and LCD docking station designs requiring stable component supply across extended production lifecycles.

Supply support for TS3A27518EPWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.

The TS3A27518EPWR belongs to TI's high-performance analog switch portfolio, engineered specifically for low-voltage, high-bandwidth signal routing in portable and embedded host controllers interfacing with SDIO, qSPI, and multimedia peripherals.

FAQ

What is the maximum analog signal voltage supported by TS3A27518EPWR?

The TS3A27518EPWR supports analog signal voltages from 0 V to 3.6 V across all COM, NC, and NO terminals, regardless of VCC level. This rail-to-rail capability allows it to pass full-swing digital signals (e.g., qSPI SIO lines) and analog audio without clipping, provided the supply remains within 1.65–3.6 V. Absolute maximum ratings permit transient excursions to ±4.6 V, but sustained operation above 3.6 V violates recommended conditions.

Does TS3A27518EPWR require external pull-up or pull-down resistors on its control pins?

No, TS3A27518EPWR does not require external biasing on IN1, IN2, or EN. Its CMOS inputs have guaranteed VIH (≥1.0 V at 1.95 V VCC) and VIL (≤0.4 V) thresholds with low leakage (<2.5 μA over temperature), allowing direct connection to FPGA or processor GPIOs. However, TI recommends tying unused control inputs to VCC or GND to prevent floating states that could cause undefined switching behavior.

Can TS3A27518EPWR be used in audio signal routing applications?

Yes, TS3A27518EPWR is qualified for audio routing: it delivers THD < 0.1% at 20 kHz (1.8 V), low 21.5 pF ON capacitance to preserve high-frequency response, and –60 dB minimum OFF isolation to suppress crosstalk between left/right channels. Its low charge injection (0.21 pC) prevents audible pop/click during switching-making it suitable for headphone jack detection, DAC output selection, and speaker routing in portable audio systems.

How does the power-down mode function in TS3A27518EPWR?

When VCC = 0 V, TS3A27518EPWR enters power-down isolation mode: all COM, NC, and NO terminals exhibit high-impedance behavior with leakage currents limited to ±12 μA (max) over temperature. This prevents back-powering of the host SoC or unintended signal coupling during battery removal or deep-sleep states-critical for portable devices meeting IEC 62368-1 safety requirements.

Is TS3A27518EPWR pin-compatible with other members of the TS3A275xx family?

TS3A27518EPWR shares identical pinout and footprint with TS3A27518E variants in WQFN-24 (RTW) packaging, including TS3A27518ERTWR and TS3A27518ERUVR. However, it is not pin-compatible with TSSOP-24 (PW) or legacy BGA MICROSTAR JUNIOR (ZQS) packages-even though they share the same part number prefix-as mechanical dimensions, pad layout, and thermal pad configuration differ significantly.