STMicroelectronics TS4956EIJT

Overview

TS4956EIJT from STMicroelectronics is a stereo audio amplifier system with integrated I²C bus interface, delivering 38 mW per channel into 16 Ω at 3.3 V (1% THD+N), supporting eight configurable output modes including BTL speaker drive, phantom-ground headphone, and mono line-out, and featuring ultra-low 0.5 µA standby current for mobile handset power management.

For engineers reviewing the TS4956EIJT datasheet, TS4956EIJT pinout, TS4956EIJT application, or TS4956EIJT equivalent, this device is selected for compact portable audio systems requiring digital gain control, pop/click suppression, thermal shutdown protection, and multi-output flexibility without external analog switches or discrete amplifiers.

Technical Context

The TS4956EIJT integrates three independent amplifier paths-stereo headphone (LHP/RHP), mono loudspeaker (MLO), and mono line-out (PHG)-each selectable via I²C register writes. Its 8-mode configuration includes BTL (modes 1/2/7), phantom-ground (modes 3/4), and single-ended (modes 5/6), with gain programmable from –34.5 dB to +12 dB in 1.5 dB steps.

It implements flip-chip packaging with 18 bumps, uses internal half-supply biasing (via BYPASS capacitor), and features dedicated I²C supply (I2CVCC) enabling true zero-power standby when grounded. Thermal shutdown activates at 150 °C, and PSRR exceeds 73 dB in BTL mode at 217 Hz.

Key Specifications

Pinout & Package

TS4956EIJT uses a lead-free flip-chip package with 18 bumps (300 µm diameter), mounted face-down with solder bumps forming electrical connections; thermal resistance junction-to-ambient is 90 °C/W with 120 mm² heat sink surface.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo audio amplifier applications.

Compared with MAX9850ETJ+T and TAS5706PAPR, the TS4956EIJT uniquely combines stereo headphone drive, BTL speaker output, mono line-out, and I²C-configurable gain/mode in a single flip-chip IC - making it irreplaceable in compact, multi-interface mobile audio subsystems.

Availability

TS4956EIJT is available at Aetrix Electronics and suitable for mobile handsets, tablet media subsystems, portable VoIP terminals, and wearable voice assistants requiring stable component supply and long-lifecycle support.

Supply support for TS4956EIJT 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 headquartered in Geneva, Switzerland, designing and manufacturing analog, mixed-signal, power, and microcontroller products for industrial, automotive, and consumer markets.

The TS4956EIJT belongs to ST's low-voltage audio amplifier product line, engineered specifically for space-constrained portable electronics requiring multi-output flexibility, ultra-low power management, and robust I²C configurability.

FAQ

What is the minimum recommended bypass capacitor value on the BYPASS pin?

A 1 µF ceramic capacitor is required between BYPASS and GND to stabilize the internal half-supply bias generator. Using less than 1 µF causes increased THD+N and reduced PSRR, especially below 100 Hz. The capacitor must be placed within 2 mm of the BYPASS pin with low-inductance layout to prevent oscillation in phantom-ground output modes.

Can TS4956EIJT operate with VCC = 2.5 V?

No. Absolute maximum ratings specify VCC must not fall below 2.7 V. At 2.5 V, the internal bias circuit fails to establish proper phantom-ground voltage, causing severe distortion (>5% THD+N) and potential latch-up. Operation below 2.7 V voids specification compliance and may damage the device under transient load conditions.

How does the I2CVCC pin affect I²C communication reliability?

I2CVCC must be tied to a stable 2.7–5.5 V supply independent of VCC. If I2CVCC is unconnected or floating, SDA/SCL pins enter undefined logic states, causing I²C bus lockup. Grounding I2CVCC forces 0.5 µA standby and disables all I²C response - this is intentional for zero-power sleep, not a fault condition.

Is thermal derating required when using TS4956EIJT in mode 7 (BTL) at 5 V?

Yes. At VCC = 5 V and 8 Ω load, mode 7 draws up to 8.7 mA quiescent current and delivers ~1.2 W dissipation under full output. With Rthja = 90 °C/W, junction temperature rises ~108 °C above ambient - exceeding 150 °C limit at Tamb > 42 °C. A 120 mm² copper pour is mandatory; forced air or thermal vias are recommended for continuous operation above 35 °C ambient.