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

STMicroelectronics STPA003OD-4WX

Name: STPA003OD-4WX
Brand: STMicroelectronics
SKU: STPA003OD-4WX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPA003OD-4WX

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 25-Flexiwatt, Formed Leads

Datasheet:: STPA003OD-4WX.pdf

Description:: IC AMP AB QUAD 85W 25FLEXIWATT

Quantity:: RFQ Add To RFQ list

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Inventory:282

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Product details

Overview

STPA003OD-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 14.4 V (10% THD), operates down to 6 V for start-stop battery profiles, and integrates on-chip offset detection (OD pin), standby/mute control, and robust protection against load dump, reverse battery, and thermal overload.

For engineers reviewing the STPA003OD-4WX datasheet, STPA003OD-4WX pinout, STPA003OD-4WX application, or STPA003OD-4WX equivalent, this device is selected for high-reliability car audio systems requiring low-voltage operation, 2 Ω drive capability, Hi-Fi distortion performance (<0.02% THD), and integrated diagnostics without external compensation components.

Technical Context

The STPA003OD-4WX implements four independent Class AB output stages with MOSFET power transistors, internally fixed 26 dB gain, and no bootstrap capacitors. Its SVR pin provides supply ripple rejection, half-supply reference generation, and pop-noise suppression via programmable charge timing.

It features dual ground domains (AC-GND and S-GND), four dedicated power grounds (PW-GND1–4), and an open-collector OD pin that asserts when differential output offset exceeds ±2.3 V - enabling real-time speaker protection without external circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	4 × 52 W/4 Ω max @ 14.4 V, 10% THD - supports full-range front/rear speaker driving in compact automotive head units
Supply Range	6–18 V DC - fully operational during engine cranking (6 V) and compatible with 12 V/48 V hybrid vehicle battery transients
THD+N	0.01% typ. @ 4 W, 4 Ω - meets Hi-Fi audio fidelity requirements for OEM infotainment systems
Gain	26 dB fixed - eliminates need for external feedback resistors and reduces BOM count
Offset Detection	±2.3 V threshold on OD pin - enables automatic speaker disconnect on DC fault before voice coil damage occurs
Thermal Resistance	1 °C/W junction-to-case - allows direct mounting to heatsink for sustained 85 W dissipation at T_case = 70 °C
Protections	Short-to-GND/V_s/load, reversed battery, load dump (50 V/50 ms), overtemperature with soft limiter - satisfies ISO 7637-2 & LV124

Pinout & Package

STPA003OD-4WX uses the Flexiwatt25 (vertical) package with exposed metal slug (TAB) for thermal conduction. Pin 25 is configured as Offset Detector (OD) output per order code suffix "OD".

Pin/Terminal	Circuit Role	Design Meaning
1 (TAB)	Thermal slug / GND	Electrically connected to PW-GND; must be soldered to heatsink for thermal management
2 (OD)	Offset detector output	Open-collector output asserting low when \|V_OUT+ − V_OUT−\| > ±2.3 V - used for speaker fault monitoring
3–4, 6–10, 17–20, 22–24	Channel ± outputs	Eight dedicated output pins (OUT1+ to OUT4−) enable true bridged-tied-load (BTL) per channel
5, 22	ST-BY / MUTE	CMOS-compatible digital inputs (0.8 V/2.2 V thresholds); require RC filtering to prevent pop noise during state transitions
7, 21	VCC	Dual supply pins (VCC1–2 and VCC3–4) reduce current loop area and improve channel separation
11	SVR	Supply voltage rejection reference - sets startup timing, ripple rejection, and internal bias voltages
12–13, 15–16, 14	IN1–IN4 / S-GND / AC-GND	Four single-ended inputs with separate signal and AC grounds minimize crosstalk and ground bounce
8–9, 18–19, 24	PW-GND1–4	Independent power grounds per channel isolate return currents and preserve PSRR

Key Features

Feature	Design Value
Low-voltage operation	Continuous audio playback at 6 V supply - essential for start-stop functionality without mute interruption
2 Ω load drive	85 W max into 2 Ω @ 14.4 V - supports high-current subwoofers and aftermarket speakers
GSM noise immunity	Integrated RF filtering and layout-optimized grounding - prevents cellular interference in cabin audio
No external compensation	Internally compensated design - eliminates stability risk and saves PCB space vs. discrete op-amp solutions
Automute on undervoltage	Automatic muting below 4.5–5.5 V supply - prevents distortion artifacts during battery sag

Applications

Automotive Head Unit

Start-Stop Audio System

Use Scenario: Integrated 4-channel amplifier in OEM dashboard radio with digital signal processor (DSP) backend.

IC Role / Device Role / Timing Role: Final-stage power driver delivering amplified analog signals to front/rear speakers and tweeters.

Use Value: 52 W/channel into 4 Ω ensures loudness margin at cabin noise levels >70 dB(A), while 6 V operation maintains audio continuity during engine restart.

Use Scenario: Infotainment system in mild-hybrid vehicle where battery voltage drops to 6–7 V during engine stop.

IC Role / Device Role / Timing Role: Primary audio amplifier maintaining uninterrupted playback during cranking transients (ISO 16750-2 pulse 4a).

Use Value: No pop/noise during voltage transition due to SVR-controlled soft-start and automute, meeting OEM acoustic quality targets.

Aftermarket Car Stereo

Protected Speaker Driver Module

Use Scenario: Compact 4×50 W amplifier board in plug-and-play stereo upgrade kit.

IC Role / Device Role / Timing Role: High-efficiency Class AB power stage replacing legacy bipolar designs with lower thermal overhead.

Use Value: Flexiwatt25 footprint and integrated protections eliminate need for external TVS, fuses, and thermal sensors - reducing bill-of-materials by 7 components.

Use Scenario: Speaker protection module in premium audio system with active DC offset monitoring.

IC Role / Device Role / Timing Role: Real-time DC fault detector using OD pin to trigger microcontroller-based relay disconnect within 100 µs.

Use Value: ±2.3 V offset threshold prevents irreversible voice coil burnout before thermal cutoff activates - extending speaker lifetime by >3×.

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, no integrated OD pin, requires external bootstrap caps	Lacks offset detection and low-voltage robustness below 8 V - unsuitable for strict start-stop compliance	Choose only if cost sensitivity outweighs diagnostic capability and 6 V operation requirement
TPA5560QDAPRQ1	Class D, 4×50 W/4 Ω, higher efficiency (85%), but higher EMI and no OD function	Requires extensive EMI filtering and layout controls; not drop-in compatible due to switching noise in analog-sensitive zones	Select when thermal constraints dominate and system-level EMI mitigation is feasible

Compared with TDA7388 and TPA5560QDAPRQ1, the STPA003OD-4WX uniquely combines 6 V operability, on-die offset detection, and Class AB linearity - making it the sole choice for OEM-grade start-stop audio where reliability, diagnostics, and analog integrity are non-negotiable.

Availability

STPA003OD-4WX is available at Aetrix Electronics and suitable for automotive infotainment systems, start-stop compliant head units, and protected speaker driver modules requiring stable component supply across multi-year production cycles.

Supply support for STPA003OD-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, specializing in automotive, industrial, and power management ICs with broad manufacturing and qualification capabilities.

The STPA series targets high-reliability automotive audio amplification, emphasizing robustness against battery transients, integrated diagnostics, and simplified system design for Tier-1 suppliers and OEMs.

FAQ

What is the purpose of the SVR pin?

The SVR pin serves three critical functions: it establishes the internal ¼ V_CC reference voltage, filters supply ripple via an external capacitor (min. 10 µF), and controls soft-start/shutdown timing to eliminate pop noise. Its internal resistor switches from 100 kΩ to 3 kΩ during initial charge to accelerate startup - a feature confirmed in Figure 21 of DS10473 Rev 2.

Can STPA003OD-4WX drive 2 Ω loads continuously?

Yes - it delivers up to 85 W per channel into 2 Ω at 14.4 V (10% THD) and sustains operation with proper heatsinking. Thermal protection engages as a soft limiter above 150 °C junction temperature, and R_{th j-case} = 1 °C/W enables safe continuous dissipation of 85 W at 70 °C case temperature per datasheet Table 4.

How does the OD pin interface with system-level diagnostics?

The OD pin is an open-collector output that pulls low when |V_OUT+ − V_OUT−| exceeds ±2.3 V (typ.), indicating DC fault. It sinks up to 1 mA and requires an external pull-up (e.g., 47 kΩ to V_CC). This signal can directly drive a microcontroller GPIO or optocoupler for speaker disconnect - verified in Table 5 and Section 5.4.1.

Is STPA003OD-4WX pin-compatible with other STPA003 variants?

No - STPA003OD-4WX (Flexiwatt25, OD on pin 25) is mechanically and electrically distinct from STPA003CD-48X and STPA003HSD-48X (both Flexiwatt27, 27 pins). Pin counts, package outlines, and pin 25/26/27 functions differ; PCB layout and footprint are not interchangeable per Tables 1 and 2 in DS10473 Rev 2.

STPA003OD-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:: 85W x 4 @ 2Ohm

Voltage - Supply:: 6V ~ 18V

Features:: Mute, Short-Circuit and Thermal Protection, Standby

Mounting Type:: Through Hole

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

Grade:: -

Qualification:: -

Supplier Device Package:: 25-Flexiwatt (Vertical)

STPA003OD-4WX FAQ

1.How can I place an order for STPA003OD-4WX through Aetrix?

Please submit a Request for Quotation (RFQ) for STPA003OD-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 STPA003OD-4WX reliable?

The price and inventory of STPA003OD-4WX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPA003OD-4WX is usually 5 days.

3.What payment methods are accepted for STPA003OD-4WX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPA003OD-4WX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPA003OD-4WX?

STPA003OD-4WX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPA003OD-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 STPA003OD-4WX?

For technical support, including STPA003OD-4WX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPA003OD-4WX requirements.

6.How does Aetrix verify that STPA003OD-4WX is sourced from the original manufacturer or authorized distributors?

All STPA003OD-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 STPA003OD-4WX meets industry standards.

7.What is the process for return or replacement of STPA003OD-4WX?

All STPA003OD-4WX units undergo pre-shipment inspection (PSI). If there is an issue with STPA003OD-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 STPA003OD-4WX part is unused and in its original packaging.

Return procedure for STPA003OD-4WX:

1.Submit a request within 90 days.

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

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