Texas Instruments TS5A21366RSER

Overview

TS5A21366 from Texas Instruments is a bidirectional 2-channel SPST analog switch optimized for low-voltage portable audio and signal routing applications. It operates from 1.65 V to 5.5 V, delivers 0.75 Ω typical ON-state resistance at 5 V, supports 1.8-V compatible logic inputs independent of VCC, and achieves 260 MHz bandwidth with <0.002% THD+N at 5 V.

For engineers reviewing the TS5A21366 datasheet, TS5A21366 pinout, TS5A21366 application, or TS5A21366 equivalent, key selection criteria include ON-resistance matching (0.04 Ω typical), charge injection (1.3 pC), OFF isolation (–62 dB at 1 MHz), and dual-channel independent control for stereo audio path switching.

Technical Context

The TS5A21366 implements two independent CMOS transmission-gate switches with rail-to-rail analog signal handling and digital control pins (IN1/IN2) that accept 1.8-V logic thresholds regardless of VCC level. Each channel provides symmetrical bidirectional conduction with no inherent directionality.

Its architecture enables power-down isolation (VCC = 0 V) and features matched rON between channels (ΔrON ≤ 0.1 Ω), low capacitance asymmetry (CNO(ON)/CCOM(ON) = 33 pF at 5 V), and high-frequency performance sustained across supply voltages from 1.65 V to 5.5 V.

Key Specifications

Pinout & Package

The TS5A21366 is packaged in an 8-pin UQFN (RSE) measuring 1.50 mm × 1.50 mm, optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TS5A21366, TS5A3154DBVR offers lower rON but sacrifices dual independent control, while TMUX1574RSER extends supply range downward and adds ESD hardening-neither is pin-compatible, requiring PCB layout revision.

Availability

TS5A21366 is available at Aetrix Electronics and suitable for smartphone audio routing, portable media player signal switching, USB-C audio adapters, and industrial portable instrumentation requiring stable component supply and guaranteed long-term sourcing.

Supply support for TS5A21366 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 company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and interface solutions.

The TS5A21366 belongs to TI's low-voltage analog switch portfolio, designed specifically for portable consumer electronics where space, power efficiency, and audio fidelity are critical constraints.

FAQ

What is the maximum analog signal voltage range supported by the TS5A21366?

The TS5A21366 supports analog signal voltages from 0 V to VCC across its NO and COM terminals. With VCC rated up to 5.5 V, the absolute maximum analog voltage is VCC + 0.5 V per Absolute Maximum Ratings, but recommended operating conditions limit VNO and VCOM to 0–VCC. This rail-to-rail capability ensures full-swing signal handling without clipping in single-supply systems using the TS5A21366.

Does the TS5A21366 require external pull-up or pull-down resistors on its IN1 and IN2 control pins?

No, the TS5A21366 does not require external pull-up or pull-down resistors on IN1 or IN2. Its CMOS input structure has defined VIH (≥1.05 V) and VIL (≤0.6 V) thresholds independent of VCC, and input leakage current is ±0.6 µA max. However, TI recommends tying unused control inputs to VCC or GND to prevent floating states that could cause unintended switching or increased supply current - a design practice explicitly noted in the datasheet for reliable TS5A21366 operation.

How does the TS5A21366 perform in power-down mode (VCC = 0 V)?

In power-down mode with VCC = 0 V, the TS5A21366 achieves high-impedance isolation between all NO–COM paths. OFF leakage currents (INO(PWROFF), ICOM(PWROFF)) are specified at ≤5 µA maximum, and the device maintains functional isolation even when analog signals remain present on NO or COM pins. This behavior is confirmed in Section 6.5 of the datasheet and makes the TS5A21366 suitable for battery-critical applications where zero-quiescent-current shutdown is required.

Can the TS5A21366 be used to switch differential audio signals?

Yes, the TS5A21366 can switch differential audio signals by using one channel (e.g., NO1/COM1) for the positive leg and the other (NO2/COM2) for the negative leg. Its matched ON-resistance (ΔrON ≤ 0.1 Ω) and matched ON-capacitance (CNO(ON) = CCOM(ON) = 33 pF at 5 V) preserve common-mode rejection and phase balance. THD+N of 0.002% at 5 V further ensures minimal distortion in high-fidelity differential paths - a capability validated in TI's audio reference designs using the TS5A21366.

What is the thermal resistance (RθJA) of the TS5A21366 in its RSE (UQFN) package?

The TS5A21366 in the RSE (UQFN-8) package has a junction-to-ambient thermal resistance (RθJA) of 168 °C/W, as specified in Section 6.4 of the datasheet. This value assumes standard JEDEC 2-layer board conditions and confirms suitability for thermally constrained portable applications. The lower RθJA compared to the VSSOP (DCU) variant (211.3 °C/W) reflects the RSE package's superior thermal performance due to its exposed thermal pad and smaller footprint - a key advantage for dense layouts using the TS5A21366.