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Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

STMicroelectronics STPA008-ZST

Name: STPA008-ZST
Brand: STMicroelectronics
SKU: STPA008-ZST
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPA008-ZST

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 36-PowerBSSOP (0.433", 11.00mm Width)

Datasheet:: STPA008-ZST.pdf

Description:: DISCRETE

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STPA008-ZST from STMicroelectronics is a quad-channel Class AB audio power amplifier IC with MOSFET output stage, designed for automotive infotainment systems. It delivers up to 4 × 50 W into 4 Ω (max), operates down to 6 V for start-stop vehicle compatibility, and integrates standby/mute, offset detection (OD), clipping diagnostics (CD-DIAG), and comprehensive protection including short-circuit, load dump, reversed battery, and thermal limiting.

For engineers reviewing the STPA008-ZST datasheet, STPA008-ZST pinout, STPA008-ZST application, or STPA008-ZST equivalent, key selection criteria include its AEC-Q100 qualification, 2 Ω driving capability, 26 dB fixed gain, Hi-Fi distortion performance (<0.02% THD at 4 W), and robust GSM/RF noise immunity - all critical for high-reliability car radio designs.

Technical Context

The STPA008-ZST employs a fully complementary P-Channel/N-Channel MOSFET output stage enabling rail-to-rail voltage swing and minimized saturation losses. Its internal architecture includes independent channel amplifiers, a shared SVR pin for supply ripple rejection and VCC/4 reference generation, and dedicated diagnostic outputs (OD, CD-DIAG) tied to real-time DC offset and clipping detection circuits.

It supports dynamic battery profiles: operational from 6 V to 18 V DC, withstands 50 ms 50 V peak transients, and maintains pop-noise-free transitions during cranking (6–16 V in <50 ms). Protection logic implements soft thermal limiting, automute below 4.5–5.5 V supply, and fault latching for open GND, output shorts, and inductive load recovery.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 50 W max into 4 Ω; 4 × 72 W max into 2 Ω - enables high-fidelity multi-zone audio in compact car head units.
Supply Voltage Range	6–18 V DC - ensures uninterrupted operation during engine start-stop cycles and battery cranking events.
THD+N	0.01 % typ. at 4 W, 1 kHz, 4 Ω - meets Hi-Fi audio requirements without external feedback compensation.
Fixed Gain	26 dB ±1 dB - eliminates need for external gain-setting resistors, reducing BOM count and layout sensitivity.
Protections	Short-to-GND/Vs, across-load, load dump (50 V/50 ms), reversed battery, thermal limiter, DC offset, and ESD (±2 kV HBM) - reduces system-level safety circuitry.
Quiescent Current	100–280 mA at 14.4 V - balances low-power standby readiness with full-output thermal management.
SVR Rejection	70 dB typ. at 100 kHz - suppresses alternator ripple without external LC filters, simplifying power supply design.

Pinout & Package

STPA008-ZST uses the PowerSO-36 (slug up) package with exposed thermal pad on top side for direct heatsink mounting. The 36-pin layout separates signal, power, and ground domains to minimize crosstalk and thermal coupling between channels.

Pin/Terminal	Circuit Role	Design Meaning
1 (TAB)	Thermal slug / case ground	Primary heat path to heatsink; electrically connected to PW-GND pins; must be soldered to copper pour for R_{th j-case} ≤ 1 °C/W.
3 (MUTE)	Digital mute control input	CMOS-compatible (0.8 V/2.2 V thresholds); requires RC filter to prevent audible click during mute transitions.
11 (OD)	Offset detector output	Analog voltage proportional to differential output offset; triggers automute if \|V_OUT+ − V_OUT−\| > ±1.3 V.
8 (CD)	Clipping detector output	Open-drain flag active when THD ≥ 2 %; used for speaker protection or DSP-based dynamic range control.
25 (SVR)	Supply voltage rejection reference	Sets internal V_CC/4 reference; capacitor here controls startup/shutdown timing and improves ripple rejection.
28 (SGND)	Signal ground reference	Isolated from power grounds (PW-GND1–4) to prevent ground loop noise in multi-channel configurations.

Key Features

Feature	Design Value
Rail-to-rail MOSFET output stage	Complementary P/N-channel structure minimizes saturation voltage drop, enabling >90 % efficiency at mid-power levels into 2 Ω loads.
Automute at low supply	Triggers at 4.5–5.5 V (V_AM), preventing distorted output and speaker damage during brownout conditions.
GSM/RF noise immunity	No external shielding or ferrites required - integrated filtering rejects cellular band interference up to 2 GHz.
Pop-noise suppression	SVR-controlled soft-start/stop and synchronized mute/standby sequencing eliminate transient clicks during power cycling.
2 Ω load driving	Stable operation into low-impedance speakers without oscillation or thermal runaway, verified per AEC-Q100 stress tests.

Applications

Car Radio Head Unit

Aftermarket Infotainment System

Use Scenario: Integrated 4-channel amplifier in OEM dashboard-mounted audio head unit supporting digital signal processing and Bluetooth streaming.

IC Role / Device Role / Timing Role: Primary audio power stage delivering full-range output to front/rear speakers; interfaces with DSP via analog line-in and provides diagnostics to microcontroller over OD/CD pins.

Use Value: AEC-Q100 qualification and 6 V operation ensure compliance with latest OEM start-stop specifications while maintaining 50 W/channel output capability.

Use Scenario: Compact 4×50 W amplifier module in plug-and-play aftermarket stereo replacement units with touchscreen UI and Android Auto support.

IC Role / Device Role / Timing Role: Standalone Class AB power driver accepting pre-amplified signals; leverages internal fixed gain and mute/standby for seamless integration with host MCU control logic.

Use Value: Low external component count (no gain resistors, minimal decoupling) reduces PCB area and assembly cost versus discrete MOSFET solutions.

Start-Stop Vehicle Audio

High-Fidelity Automotive Subwoofer Driver

Use Scenario: Audio subsystem in hybrid/electric vehicles where battery voltage fluctuates between 6–14.4 V during regenerative braking and engine restart.

IC Role / Device Role / Timing Role: Core amplifier maintaining continuous playback during voltage dips; automute and thermal limiter prevent fault propagation during transient overload.

Use Value: Operates without reset or reinitialization across 6–18 V range - eliminates audio dropout and user-perceivable interruptions.

Use Scenario: Dedicated 2-channel bridge-tied load (BTL) configuration using two STPA008-ZST channels to drive a 2 Ω subwoofer in premium car audio systems.

IC Role / Device Role / Timing Role: Dual-channel parallel mode with matched gain and phase response; OD/CD pins enable real-time thermal and clipping monitoring for adaptive bass boost.

Use Value: 72 W max into 2 Ω enables deep-bass extension without external current-boosting stages or heatsink oversizing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA7388	Class AB, 4×41 W/4 Ω, 14.4 V; no SVR pin; lower THD (0.03 %) but no automute or CD-DIAG.	Lacks integrated diagnostics and low-voltage automute; requires external mute control and thermal monitoring.	Select when cost sensitivity outweighs diagnostic needs and system voltage remains stable >10 V.
MAX9776	Class D, 4×50 W/4 Ω, 12 V; higher efficiency (>85 %); no AEC-Q100 rating; requires external gate drivers.	Higher EMI risk due to switching frequency; unsuitable for safety-critical OEM deployments without additional filtering.	Select only for non-AEC-Q100 aftermarket designs prioritizing thermal footprint over EMC robustness.

Compared with TDA7388 and MAX9776, STPA008-ZST uniquely combines AEC-Q100 compliance, integrated diagnostics (OD/CD), automute, and 6 V operation - making it the only option for OEM start-stop audio systems requiring zero-audio-interruption reliability and functional safety-aware monitoring.

Availability

STPA008-ZST is available at Aetrix Electronics and suitable for automotive infotainment systems, start-stop vehicle audio modules, and high-fidelity aftermarket head units requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for STPA008-ZST 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 vertical manufacturing and rigorous automotive qualification processes.

STPA008-ZST belongs to ST's STPA series of automotive audio power amplifiers, engineered specifically for next-generation car radios demanding ultra-low distortion, wide supply range, and built-in functional safety diagnostics.

FAQ

What is the minimum recommended capacitor value on the SVR pin?

The datasheet specifies a minimum 10 µF capacitor on the SVR pin to ensure pop-noise-free startup and shutdown. This capacitor sets the time constant for internal reference generation and supply ripple rejection; using less than 10 µF risks audible transients and reduced SVR performance at high frequencies.

How does the automute function respond to supply voltage drops?

Automute activates when supply voltage falls below 4.5–5.5 V (V_AM threshold), muting all channels within microseconds to prevent distorted output. The SVR capacitor discharges rapidly, and the amplifier resumes normal operation only after VS rises above 5.5 V and stabilizes - ensuring no clipped audio reaches speakers during brownout.

Can STPA008-ZST drive 2 Ω loads continuously at full power?

Yes - it is rated for 4 × 72 W into 2 Ω at maximum supply (15.2 V), with thermal protection engaging only under sustained overload. Continuous 2 Ω operation requires proper heatsinking (R_{th j-case} ≤ 1 °C/W) and airflow per the PowerSO-36 mechanical data sheet; derating applies above 70 °C ambient.

What is the purpose of the separate SGND and PW-GND pins?

SGND (pin 28) serves as the clean reference for all inputs and internal biasing, while PW-GND pins (4, 13, 22, 33) carry high-current return paths for each channel's output stage. Separating them prevents ground bounce and crosstalk, preserving channel isolation >65 dB and minimizing intermodulation distortion in multi-speaker systems.

STPA008-ZST Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-PowerBSSOP (0.433", 11.00mm Width)

Packaging:: Bulk

Product Status:: Active

Type:: Class AB

Output Type:: 4-Channel (Quad)

Max Output Power x Channels @ Load:: 50W x 4 @ 4Ohm

Voltage - Supply:: 6V ~ 18V

Features:: -

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 105°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Supplier Device Package:: PowerSO-36 EPU

STPA008-ZST FAQ

1.How can I place an order for STPA008-ZST through Aetrix?

Please submit a Request for Quotation (RFQ) for STPA008-ZST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STPA008-ZST reliable?

The price and inventory of STPA008-ZST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPA008-ZST is usually 5 days.

3.What payment methods are accepted for STPA008-ZST?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPA008-ZST transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPA008-ZST?

STPA008-ZST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPA008-ZST order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STPA008-ZST?

For technical support, including STPA008-ZST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPA008-ZST requirements.

6.How does Aetrix verify that STPA008-ZST is sourced from the original manufacturer or authorized distributors?

All STPA008-ZST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STPA008-ZST meets industry standards.

7.What is the process for return or replacement of STPA008-ZST?

All STPA008-ZST units undergo pre-shipment inspection (PSI). If there is an issue with STPA008-ZST, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STPA008-ZST part is unused and in its original packaging.

Return procedure for STPA008-ZST:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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