STMicroelectronics TS472EIJT

Overview

TS472EIJT from STMicroelectronics is a fully-differential microphone preamplifier IC optimized for high-performance audio systems in portable devices, featuring 10 nV/√Hz input noise at 1 kHz, adjustable gain from 0 to 40 dB, and integrated 2.0 V low-noise microphone bias output with ≤1 μA standby current. It operates from 2.2–5.5 V single supply and delivers 40 kHz bandwidth independent of gain setting.

For engineers reviewing the TS472EIJT datasheet, TS472EIJT pinout, TS472EIJT application, or TS472EIJT equivalent, this device is selected for ultra-low-noise electret microphone signal conditioning in space-constrained, battery-sensitive designs requiring differential signaling, fast wake-up (5 ms typ.), and robust PSRR (>70 dB) across audio band.

Technical Context

The TS472EIJT implements a fully-differential amplifier architecture with internal common-mode feedback that centers output DC bias at VCC/2, maximizing dynamic range and enabling rail-to-rail swing capability. Its gain is set either by external resistor on GS pin (0–40 dB) or via voltage bias (20 dB default), and it integrates a dedicated low-noise 2.0 V bias generator with 100 Ω output impedance and 80 dB PSRR at 217 Hz.

It features dual low-pass filter pins (C1/C2) for configurable high-frequency roll-off up to 40 kHz, active-low STBY control for 1 μA shutdown, and built-in ESD protection (2 kV HBM). The device supports both differential and single-ended output configurations, though differential mode preserves full PSRR and CMRR performance.

Key Specifications

Pinout & Package

TS472EIJT is available in QFN24 4 × 4 mm lead-free package (JEDEC MO-220 variant), thermally enhanced with exposed thermal pad (pin 22 = GND). Pin assignments are validated per STMicroelectronics Doc ID 11015 Rev 6, Table 2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microphone preamplifier applications.

Compared with MAX4466ETE+ and INA217AIDR, TS472EIJT uniquely combines differential I/O, integrated 2.0 V bias, 10 nV/√Hz noise, and sub-μA standby in a single 4×4 mm QFN-making it optimal for space- and power-constrained portable audio front-ends.

Availability

TS472EIJT is available at Aetrix Electronics and suitable for video conferencing systems, notebook computers, voice recognition edge devices, and camera audio subsystems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TS472EIJT 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 solutions for automotive, industrial, and consumer markets.

The TS472 belongs to ST's high-fidelity audio signal conditioning product line, engineered specifically for ultra-low-noise, low-power microphone interface applications in portable computing and communication devices.

FAQ

What is the maximum recommended load capacitance on the BIAS pin?

The BIAS pin supports up to 100 µF total capacitance, including filtering capacitor C3. STMicroelectronics specifies 1 µF (C3) as optimal for stability and noise suppression; larger values may degrade transient response during wake-up but do not cause oscillation. Load regulation remains within ±0.1 V up to 2 mA output current.

Can TS472EIJT drive a 10 kΩ differential input ADC directly?

Yes - TS472EIJT's differential outputs deliver ≥2.5 VPP swing into 10 kΩ loads at 20 dB gain and 3 V supply, with THD+N <0.1%. Output impedance is <100 Ω, ensuring minimal signal loss. For best SNR, match ADC input common-mode voltage to VCC/2 and maintain symmetric PCB trace lengths.

How does gain setting via GS pin affect power consumption?

Supply current varies linearly with gain: 1.8 mA at 20 dB, 2.4 mA at 40 dB, and 1.3 mA at 0 dB (per Table 5). This occurs because higher gain increases internal transconductance stage bias. Standby current remains ≤1 μA regardless of GS configuration, as STBY disables all active circuitry.

Is the QFN24 package RoHS and REACH compliant?

Yes - TS472EIJT QFN24 package is lead-free, RoHS Directive 2011/65/EU compliant, and REACH SVHC-free per STMicroelectronics' material declarations (Doc ID 11015 Rev 6, Section 6). The finish is matte Sn, compatible with standard Pb-free reflow profiles (peak 260°C).