STMicroelectronics STPA002OD-4WX

Overview

STPA002OD-4WX from STMicroelectronics is a quad-channel Class AB MOSFET audio power amplifier in Flexiwatt25 package, designed for automotive head units. It delivers up to 4 × 52 W into 4 Ω at 15.2 V, operates down to 6 V without pop noise, integrates standby/mute/DC offset detection (OD pin), and sustains stop-start and hybrid vehicle battery transitions.

For engineers reviewing the STPA002OD-4WX datasheet, STPA002OD-4WX pinout, STPA002OD-4WX application, or STPA002OD-4WX equivalent, key selection criteria include low-voltage robustness (6–18 V operation), 2 Ω load capability, integrated protection features (short-to-GND/Vs/across-load, thermal limiter, load dump), and OEM-compliant automute behavior during supply dips.

Technical Context

The STPA002OD-4WX implements four independent Class AB amplifier channels with internally fixed 26 dB gain, no external compensation required, and MOSFET output stage optimized for high-current drive into 2 Ω loads. Its SVR pin serves triple function: generating VCC/4 reference, enabling pop-noise-free startup/shutdown via 10 μF capacitor, and enhancing supply ripple rejection.

It embeds real-time DC offset detection (OD pin) with ±1 V trip threshold and saturation voltage ≤0.4 V, plus automute activation at 4.5–5.5 V supply, ensuring silent operation during cranking (6–16 V transients in <10 ms). Protection logic includes 150 μs cyclic retry on short-across-load and soft thermal limiting above 150 °C junction temperature.

Key Specifications

Pinout & Package

STPA002OD-4WX uses the Flexiwatt25 (vertical) package with exposed metal slug (TAB) for thermal dissipation. Pin numbering follows top-view layout per Figure 4 of ST's datasheet (DocID024368 Rev 3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel automotive audio amplifier applications.

Compared with TDA7388 and TPA5560QPHPRQ1, STPA002OD-4WX uniquely combines Class AB fidelity, 6 V operational floor, integrated OD pin, and Flexiwatt25 thermal performance - making it optimal for OEM stop-start audio systems where reliability and reduced external component count are critical.

Availability

STPA002OD-4WX is available at Aetrix Electronics and suitable for automotive head units, OEM infotainment systems, aftermarket car audio modules, and hybrid vehicle audio subsystems requiring stable component supply and long-term lifecycle support.

Supply support for STPA002OD-4WX 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, specializing in automotive-grade analog, power, and microcontroller solutions with AEC-Q100 qualification expertise.

The STPA002 belongs to ST's automotive audio power amplifier product line, engineered specifically for robust, high-fidelity sound reproduction in modern vehicles with stop-start, hybrid, and electric powertrains.

FAQ

What is the minimum operating voltage for continuous audio playback?

The STPA002OD-4WX maintains full functionality down to 6 V supply voltage, delivering reduced but usable output power (e.g., ~4×12 W into 4 Ω) without muting or pop noise. Below 6 V, automute activates at 4.5–5.5 V to protect speakers, and the device resumes playback automatically when voltage recovers above 6 V.

How does the OD (offset detector) pin interface with external protection circuitry?

The OD pin is an open-drain output that pulls low when |V_OUT+ − V_OUT−| exceeds ±1 V. It sinks up to 1 mA and requires an external pull-up resistor (typically 10 kΩ to 5 V). This signal can directly drive a speaker relay driver or microcontroller GPIO to disconnect speakers before DC fault damage occurs.

Can STPA002OD-4WX drive 2 Ω speakers reliably, and what thermal considerations apply?

Yes - it delivers 4×55 W into 2 Ω at 14.4 V with 10 % THD and includes built-in thermal limiting. For sustained 2 Ω operation, the Flexiwatt25 package must be mounted to a heatsink achieving ≤1.5 °C/W total thermal resistance (junction-to-ambient), as R_{th j-case} is ≤1 °C/W and PCB copper area contributes significantly.

What is the purpose of the SVR pin, and what capacitor value is required?

The SVR pin sets the internal VCC/4 reference, filters supply ripple, and controls startup/shutdown timing. A minimum 10 μF low-ESR electrolytic capacitor is required between SVR and GND to ensure pop-free transitions and achieve 70 dB supply rejection at 100 Hz. Larger values (>22 μF) further reduce startup time but are not mandatory.