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

STMicroelectronics STPA008-4WX

Name: STPA008-4WX
Brand: STMicroelectronics
SKU: STPA008-4WX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPA008-4WX

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 25-Flexiwatt, Formed Leads

Datasheet:: STPA008-4WX.pdf

Description:: IC AMP AB QUAD 50W 25FLEXIWATT

Quantity:: RFQ Add To RFQ list

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Inventory:267

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Product details

Overview

STPA008-4WX from STMicroelectronics is a quad-channel Class AB audio power amplifier IC with MOSFET output stage, designed for automotive head units. It delivers up to 4 × 50 W into 4 Ω (max), operates down to 6 V for start-stop compatibility, features integrated standby/mute functions, and includes comprehensive protection against short circuits, thermal overload, load dump, and reversed battery.

For engineers reviewing the STPA008-4WX datasheet, STPA008-4WX pinout, STPA008-4WX application, or STPA008-4WX equivalent, key selection criteria include 2 Ω load capability, AEC-Q100 qualification, rail-to-rail output swing, GSM/RF noise immunity, and automute functionality at low supply voltage detection.

Technical Context

The STPA008-4WX implements a fully complementary P-Channel/N-Channel MOSFET output stage enabling rail-to-rail output voltage swing and minimized saturation losses. Its internal fixed gain of 26 dB eliminates external feedback network requirements, while the SVR pin serves triple duty: setting VCC/4 input reference, improving supply ripple rejection, and generating VCC/2 output bias.

It integrates real-time DC offset detection (OD pin), clipping diagnostics (CD-DIAG on FW27 variants), and a soft thermal limiter that activates before junction temperature exceeds 150 °C. The device sustains battery cranking transients from 16 V to 6 V in <50 ms without audible pop or interruption.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 50 W max into 4 Ω; enables high-fidelity multi-zone audio in compact car radio designs
Supply Voltage Range	6–18 V DC; supports engine start-stop operation and withstands cranking dips to 6 V
Load Capability	Stable into 2 Ω loads; allows high-current speaker configurations without oscillation
THD+N	0.01 % typ. at 4 W, 1 kHz; meets Hi-Fi distortion performance for premium audio systems
Protections	Short-to-GND/Vs/across-load, overtemperature (soft limiter), load dump (50 V pk), reversed battery, ESD
AEC-Q100 Grade	Qualified per AEC-Q100 Rev G; rated for automotive under-hood temperature range (−40 °C to +105 °C ambient)
Gain	26 dB fixed internal gain; eliminates external resistor networks and reduces BOM count

Pinout & Package

STPA008-4WX uses the Flexiwatt25 (vertical) package - a 25-pin, thermally enhanced, through-hole power package with exposed metal slug (TAB) for direct heatsink mounting. Pin 1 is TAB (device slug); pin 25 is PW-GND4. The package complies with JEDEC MS-017AC and supports >85 W power dissipation at T_case = 70 °C.

Pin/Terminal	Circuit Role	Design Meaning
TAB (Pin 1)	Thermal slug / case ground	Primary heat path to heatsink; must be electrically connected to system ground for safety and thermal performance
OD (Pin 2)	Offset detector output	Open-drain flag indicating ±1.3 V differential output offset; used for speaker protection and fault logging
ST-BY (Pin 5)	Standby control input	CMOS-compatible active-high input; >2.2 V enables amplifier, <1 V disables with pop-free transition via SVR timing
MUTE (Pin 22)	Mute control input	CMOS-compatible active-high input; >2.2 V mutes all channels with >90 dB attenuation at 4 W reference
SVR (Pin 11)	Supply voltage rejection reference	Internal VCC/4 reference node; external 10 μF capacitor ensures pop-free startup/shutdown and improves PSRR by 70 dB @ 100 kHz
OUT1+/OUT1− (Pins 9/8)	Differential output pair, Channel 1	Complementary MOSFET outputs delivering rail-to-rail swing; supports bridged-tied-load (BTL) or SE configurations

Key Features

Feature	Design Value
Rail-to-rail output swing	Enabled by complementary P/N-channel MOSFET stage; maximizes dynamic range and power efficiency at low supply voltages
Automute at low voltage	Triggers mute when supply drops below 4.5–5.5 V; prevents distortion and protects speakers during brown-out conditions
GSM/RF noise immunity	Integrated filtering and layout-hardened design suppresses cellular interference without external ferrites or shielding
Low external component count	No external gain-setting resistors, no bootstrap capacitors, minimal decoupling (4 × 100 nF + 1 × 10 μF SVR)
Start-stop compliant operation	Continuous audio playback at 6 V supply; maintains full functionality including protections and diagnostics

Applications

Automotive Head Unit

Multi-Zone In-Car Audio

Use Scenario: Integrated infotainment system in mid-tier passenger vehicles requiring 4-channel amplification with OEM-grade reliability.

IC Role / Device Role / Timing Role: Primary audio power stage driving front/rear speakers; manages mute/standby sequencing synchronized with vehicle CAN bus ignition state.

Use Value: Eliminates need for discrete protection circuitry and external gain-setting components, reducing PCB area by ≥35% vs. legacy bipolar solutions.

Use Scenario: Premium sedan audio system distributing independent content to driver, front passenger, and rear zones.

IC Role / Device Role / Timing Role: Quad-channel amplifier providing isolated analog outputs; leverages channel gain unbalance ≤±0.5 dB for consistent loudness across zones.

Use Value: 2 Ω drive capability enables high-sensitivity tweeters and subwoofers without external current boosters, simplifying crossover design.

Start-Stop Compatible Radio

Hybrid Vehicle Audio Module

Use Scenario: Compact car radio operating in urban stop-go traffic where battery voltage cycles between 12.6 V and 6.0 V.

IC Role / Device Role / Timing Role: Core power amplifier maintaining uninterrupted playback during engine restart; automute triggers within 100 μs of voltage drop below 5 V.

Use Value: Sustains THD <0.02 % at 6 V/4 Ω, preserving audio fidelity during low-voltage operation without manual user intervention.

Use Scenario: Audio subsystem in hybrid electric vehicles subject to rapid battery voltage transitions (e.g., 12 V → 16 V in <10 ms during engine start).

IC Role / Device Role / Timing Role: Robust power stage immune to fast upward transients; no pop/noise generation due to SVR-controlled bias ramping.

Use Value: Avoids costly external transient suppressors and enables single-supply architecture, cutting BOM cost by $1.20/unit vs. dual-rail alternatives.

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	Bipolar output stage; lower max output (4×41 W/4 Ω); no automute; requires external gain resistors	Lacks 6 V operation and AEC-Q100 Grade 0 qualification; limited to non-start-stop platforms	Choose only if cost sensitivity outweighs thermal efficiency and low-voltage robustness requirements
MAX9768	Class D topology; higher efficiency (85 %); smaller footprint; but higher EMI and no 2 Ω drive rating	Suitable for space-constrained designs but requires extensive EMI filtering; not validated for direct 2 Ω speaker loads	Select when board area and thermal management are critical, and RF-sensitive environments permit added filter complexity

Compared with TDA7388 and MAX9768, STPA008-4WX uniquely combines Class AB linearity, 6–18 V operation, 2 Ω capability, and integrated automute-making it the only qualified solution for OEM start-stop audio systems requiring zero-audible-transient behavior.

Availability

STPA008-4WX is available at Aetrix Electronics and suitable for automotive infotainment, start-stop compatible head units, and hybrid vehicle audio modules requiring stable component supply across extended product lifecycles.

Supply support for STPA008-4WX 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, industrial, and power management ICs with broad manufacturing scale and AEC-Q100 validation infrastructure.

The STPA series targets high-fidelity automotive audio with Class AB MOSFET architectures optimized for low-voltage resilience, thermal robustness, and OEM-compliant protection sets-addressing stringent start-stop and hybrid vehicle requirements.

FAQ

What is the minimum recommended SVR capacitor value and why?

The minimum recommended SVR capacitor is 10 μF. This value ensures sufficient charge storage to maintain stable VCC/4 reference during supply transients, enabling pop-free startup/shutdown and achieving 70 dB supply voltage rejection at 100 kHz. Using less than 10 μF risks audible click noise and degraded PSRR performance.

Can STPA008-4WX drive 2 Ω speakers in parallel without derating?

Yes-STPA008-4WX is explicitly rated for continuous 2 Ω operation, delivering up to 4 × 72 W (max) with full protection engagement. Its MOSFET output stage and thermal limiter allow sustained 2 Ω loads without external current limiting or forced airflow, provided heatsink thermal resistance ≤1.0 °C/W.

How does automute differ from manual mute function?

Automute is an autonomous feature triggered when supply voltage falls below 4.5–5.5 V (typical 5 V threshold); it forces mute regardless of MUTE pin state to prevent distortion-induced speaker damage. Manual mute responds only to the CMOS-level signal applied to the MUTE pin and offers >90 dB attenuation at 4 W reference.

Is the OD (offset detector) pin open-drain or push-pull?

The OD pin is open-drain with internal pull-down. When differential output offset exceeds ±1.3 V, OD pulls low (≤0.2 V at 1 mA sink); otherwise, it remains high-impedance. An external pull-up resistor (typically 10 kΩ to VCC) is required to generate a logic-high signal for microcontroller fault monitoring.

STPA008-4WX Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 25-Flexiwatt, Formed Leads

Packaging:: Tube

Product Status:: Active

Type:: Class AB

Output Type:: 4-Channel (Quad)

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

Voltage - Supply:: -

Features:: Short-Circuit and Thermal Protection

Mounting Type:: Through Hole

Operating Temperature:: -

Grade:: Automotive

Qualification:: AEC-Q100

Supplier Device Package:: 25-Flexiwatt (Vertical)

STPA008-4WX FAQ

1.How can I place an order for STPA008-4WX through Aetrix?

Please submit a Request for Quotation (RFQ) for STPA008-4WX 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 STPA008-4WX reliable?

The price and inventory of STPA008-4WX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPA008-4WX is usually 5 days.

3.What payment methods are accepted for STPA008-4WX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPA008-4WX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPA008-4WX?

STPA008-4WX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPA008-4WX 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 STPA008-4WX?

For technical support, including STPA008-4WX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPA008-4WX requirements.

6.How does Aetrix verify that STPA008-4WX is sourced from the original manufacturer or authorized distributors?

All STPA008-4WX 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 STPA008-4WX meets industry standards.

7.What is the process for return or replacement of STPA008-4WX?

All STPA008-4WX units undergo pre-shipment inspection (PSI). If there is an issue with STPA008-4WX, 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 STPA008-4WX part is unused and in its original packaging.

Return procedure for STPA008-4WX:

1.Submit a request within 90 days.

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

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