STMicroelectronics TS4961TIQT

Overview

TS4961TIQT from STMicroelectronics is a mono Class D audio power amplifier integrated with a dual SPST analog switch in a single QFN-16 package. It delivers 1.6 W into 4 Ω at 4.2 V (1% THD+N), achieves 88% typical efficiency, and features ultra-high analog switch off-isolation of –80 dB (20 Hz–20 kHz). Designed for portable audio routing and amplification, it operates across 2.4–4.3 V and supports independent control of two audio signal paths to loudspeaker outputs.

For engineers reviewing the TS4961TIQT datasheet, TS4961TIQT pinout, TS4961TIQT application, or TS4961TIQT equivalent, key selection criteria include its dual-function architecture (amplifier + switch), adjustable gain via external resistors, low 2 mA quiescent current, and verified performance in cellular telephone and notebook PC audio subsystems.

Technical Context

The device integrates two functionally independent sections: a PWM-based Class D amplifier with 250–280 kHz base frequency and configurable gain, and a high-speed CMOS analog switch with separate SL1/SL2 control inputs enabling independent connection of D1↔T1 and D2↔T2 paths. Both sections share a common voltage range (2.4–4.3 V) but use isolated supply pins (VCCA and VCCS) and grounds (GNDA and GNDS) to minimize crosstalk.

Amplifier operation is enabled by active-low /STDBY; standby current is ≤1 µA. The analog switch exhibits 1.1–1.5 Ω typical ON-resistance (at 4.3 V), <40 ns turn-off time, and –80 dB off-isolation - critical for preventing audible pop/click and maintaining signal integrity during dynamic audio path switching.

Key Specifications

Pinout & Package

TS4961TIQT uses a 3 × 3 mm QFN-16 package with exposed thermal pad (E-Pad) that must be connected to ground for optimal thermal performance and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mono Class D amplifier + analog switch applications.

Compared with MAX98357AETE+T and TAS5342AIDBTR, TS4961TIQT uniquely integrates both functions in one QFN-16 package with optimized low-voltage operation (2.4 V), making it the sole solution for space- and power-constrained portable designs requiring concurrent amplification and dynamic signal routing.

Availability

TS4961TIQT is available at Aetrix Electronics and suitable for cellular telephones, PDAs, and notebook PCs requiring stable component supply and long-term design-in support.

Supply support for TS4961TIQT 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

STMicroelectronics is a global semiconductor leader specializing in power management, analog, and microcontroller technologies for automotive, industrial, and consumer applications.

The TS4961TIQT belongs to ST's portable audio power management product line, engineered specifically to consolidate amplification and analog signal routing in battery-powered handheld devices with stringent size and efficiency requirements.

FAQ

What is the recommended LC filter configuration for the TS4961TIQT Class D output?

A 15 µH inductor and 1 µF ceramic capacitor form the minimum recommended low-pass filter between OUT+ / OUT− and the speaker. ST specifies this configuration to suppress 280 kHz PWM carrier energy while preserving audio bandwidth up to 20 kHz. Layout must minimize loop area and place components adjacent to the IC to reduce EMI radiation.

Can the TS4961TIQT operate with a single shared supply for both VCCA and VCCS?

Yes - VCCA and VCCS may be tied together to a common 2.4–4.3 V rail, but ST recommends separate supplies with individual 100 nF decoupling capacitors to minimize noise coupling from the Class D switching node into the analog switch section. Shared supply increases risk of audible artifacts during simultaneous amplifier and switch activity.

How does the TS4961TIQT handle differential versus single-ended input signals?

The amplifier accepts true differential inputs (IN+, IN−) with common-mode range of 0.5 V to VCC–0.8 V. For single-ended sources, IN− must be AC-coupled to mid-supply (VCC/2) using a resistor divider and bypass capacitor; the datasheet provides exact values based on gain-setting resistors to maintain CMRR >54 dB.

Is the TS4961TIQT still in active production given its 2008 datasheet revision?

Although the initial datasheet is dated September 2008, TS4961TIQT remains an active, non-obsolete part per STMicroelectronics' official product status database (as of Q2 2024). It is stocked by major distributors including Digi-Key and Mouser, with full technical documentation and application notes still maintained on st.com.