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

STMicroelectronics STPA008-48X

Name: STPA008-48X
Brand: STMicroelectronics
SKU: STPA008-48X
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STPA008-48X

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 27-Flexiwatt, Formed Leads

Datasheet:: STPA008-48X.pdf

Description:: IC AMP AB QUAD 50W 27FLEXIWATT

Quantity:: RFQ Add To RFQ list

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Inventory:1,925

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Product details

Overview

STPA008-48X from STMicroelectronics is a quad-channel Class AB MOSFET audio power amplifier designed for automotive head units, delivering 4 × 50 W into 4 Ω (max), 4 × 72 W into 2 Ω (max), and operating down to 6 V supply for start-stop vehicle compatibility. It integrates standby/mute control, DC offset detection, and clipping diagnostics in a Flexiwatt27 vertical package.

For engineers reviewing the STPA008-48X datasheet, STPA008-48X pinout, STPA008-48X application, or STPA008-48X equivalent, key selection criteria include 2 Ω load capability, AEC-Q100 qualification, GSM/RF noise immunity, automute at 4.5–5.5 V supply threshold, and thermal protection with soft limiter - all critical for high-reliability car audio systems.

Technical Context

The STPA008-48X implements a fully complementary P-Channel/N-Channel MOSFET output stage enabling rail-to-rail voltage swing and minimized saturation losses. Its internal fixed 26 dB gain, 100–300 kHz high-frequency cutoff, and ITU-R ARM–weighted pop-noise suppression ensure Hi-Fi fidelity under dynamic battery conditions.

It features dual protection architecture: hardware-level fault detection (output short to GND/Vs/load, reversed battery, load dump) plus intelligent monitoring (DC offset > ±1.3 V, clipping at THD ≥ 2 %, thermal limiter activation at junction temperature > 150 °C), all without external compensation components.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power (4 Ω)	4 × 50 W max; enables full-range speaker drive in compact 4-channel OEM head units
Supply Voltage Range	6–18 V; supports engine start-stop operation without mute or dropout
THD @ 4 W	0.01–0.02 %; meets Hi-Fi distortion requirements for premium audio reproduction
Channel Gain Unbalance	±0.5 dB; ensures consistent loudness across all four channels without calibration
SVR @ 100 kHz	60–70 dB; rejects high-frequency alternator ripple and GSM switching noise
Crosstalk @ 1 kHz	65–75 dB; prevents inter-channel signal leakage in multi-zone audio routing
Quiescent Current	100–280 mA; balances low-idle consumption with fast wake-up readiness

Pinout & Package

STPA008-48X uses the Flexiwatt27 (vertical) package with 27 pins and an exposed metal slug (TAB) for thermal dissipation. Pin numbering follows top-view orientation per Figure 4 of the datasheet (DocID027887 Rev 2).

Pin/Terminal	Circuit Role	Design Meaning
TAB (Pin 1 & 27)	Thermal slug / GND connection	Primary heat path to heatsink; must be soldered to PCB copper pour for R_{th j-case} ≤ 1 °C/W
OD (Pin 2)	Offset detector output	Open-drain flag asserting when differential output exceeds ±1.3 V - triggers system-level DC fault response
OUT1+ / OUT1− (Pins 9–10)	Channel 1 push-pull output	Differential bridge output driving 2–4 Ω loads; no external bootstrap required
ST-BY (Pin 5)	Standby enable input	CMOS-compatible (0–2.2 V = OFF; ≥2.6 V = ON); RC filtering mandatory for pop-free transitions
CD-DIAG (Pin 26)	Clipping detection output	Active-low open-drain signal asserted when THD ≥ 2 % - used for dynamic volume limiting or LED indication
SVR (Pin 11)	Supply voltage rejection reference	Internal V_CC/4 reference node; 10 μF capacitor sets startup/shutdown timing and improves ripple rejection

Key Features

Feature	Design Value
Rail-to-rail MOSFET output stage	Enables full 0–V_CC swing with <100 mV saturation loss - maximizes usable voltage headroom at low supply
Automute at low V_CC	Triggers attenuation at 4.5–5.5 V threshold - prevents distortion during cranking without software intervention
Integrated clipping diagnostics	Hardware-based THD ≥2 % detection on all channels - enables real-time audio integrity monitoring
AEC-Q100 qualified	Rated for Grade 2 (−40 to +105 °C ambient) - validated for under-dash automotive environments
2 Ω load capability	Sustains continuous operation into 2 Ω without current limiting - supports high-sensitivity coaxial speakers

Applications

OEM Automotive Head Unit

Start-Stop Vehicle Audio System

Use Scenario: Integrated 4-channel amplifier in factory-installed infotainment head unit powering front/rear speakers.

IC Role / Device Role / Timing Role: Primary audio power stage with embedded mute/standby sequencing and DC fault detection.

Use Value: Eliminates need for external protection ICs and discrete MOSFET drivers - reduces BOM count by ≥7 components.

Use Scenario: Audio subsystem in hybrid electric vehicle requiring uninterrupted playback during engine restart.

IC Role / Device Role / Timing Role: Low-voltage resilient amplifier maintaining 4 × 28 W output at 6 V with automute recovery.

Use Value: Sustains audio continuity across 6–16 V battery transients - meets OEM cranking spec (t < 50 ms, ΔV = 10 V).

High-Fidelity Aftermarket Receiver

GSM-Immune Car Stereo Module

Use Scenario: Compact 4×50 W aftermarket receiver targeting audiophile users with low-impedance speakers.

IC Role / Device Role / Timing Role: High-fidelity Class AB output stage with 0.01 % THD and 75 dB crosstalk isolation.

Use Value: Delivers studio-grade clarity without external feedback compensation - simplifies PCB layout.

Use Scenario: Embedded audio module in telematics unit co-located with cellular modem.

IC Role / Device Role / Timing Role: RF-noise-hardened amplifier rejecting GSM burst interference via SVR filtering and layout-optimized ground separation.

Use Value: Maintains SNR > 100 dB during 900/1800 MHz transmission - eliminates audible "buzz" artifacts.

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 CD-DIAG pin, lower SVR (50 dB), requires external offset protection	Lacks integrated clipping detection and automute; needs external circuitry for DC fault handling	Lower cost where diagnostic features are non-critical and design margin allows external protection
STA559BW	Class D, 4 × 70 W/2 Ω, higher efficiency (≥85 %), but higher EMI sensitivity and no AEC-Q100 Grade 2 rating	Requires extensive EMI filtering and heatsinking; not qualified for under-dash ambient temperatures	Preferred only when board space/thermal constraints outweigh RF immunity and qualification requirements

Compared with TDA7388 and STA559BW, STPA008-48X uniquely combines AEC-Q100 Grade 2 qualification, integrated clipping/offset diagnostics, and robust 6 V operation - making it the sole choice for OEM-compliant, diagnostic-capable, start-stop-ready 4-channel amplifiers.

Availability

STPA008-48X is available at Aetrix Electronics and suitable for automotive infotainment systems, start-stop vehicle audio modules, and high-fidelity aftermarket receivers requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.

Supply support for STPA008-48X 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 over 40 years of analog/mixed-signal design heritage.

The STPA series targets high-reliability automotive audio, engineered specifically for OEM head units needing AEC-Q100 qualification, low-voltage resilience, and integrated diagnostics - not general-purpose amplification.

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/shutdown transitions and optimal supply ripple rejection. This value sets the time constant with the internal 50 kΩ resistor (reduced to 3 kΩ during fast charge phase), enabling controlled V_CC/4 reference ramping. Using less than 10 μF risks audible transients and degraded SVR performance above 10 kHz.

How does the automute function respond to battery voltage drops?

The automute activates when supply voltage falls below 4.5–5.5 V (typical threshold), attenuating output by ≥90 dB within milliseconds. The amplifier remains powered but muted until V_CC recovers above 5.5 V, then resumes playback without reset. This behavior is hardware-implemented and independent of ST-BY or MUTE pin states - ensuring fail-safe operation during cranking events.

Can STPA008-48X drive 2 Ω loads continuously?

Yes - the device is explicitly rated for continuous 2 Ω operation, delivering up to 4 × 72 W (max) with thermal protection active. Its MOSFET output stage and 1 °C/W junction-to-case thermal resistance allow sustained 2 Ω drive when mounted on a properly sized heatsink (≥150 cm² copper area). Derating curves in Figure 17 confirm safe average power dissipation at 2 Ω under audio program simulation.

What protection mechanisms trigger the OD (offset detector) pin?

The OD pin asserts low when differential output voltage exceeds ±1.3 V (typical), indicating potential speaker short, open load, or internal failure. It sources ≤15 μA leakage when inactive and sinks >1 mA when saturated. This signal is intended for microcontroller polling or external latch circuits - not for automatic shutdown - allowing system-level fault classification before corrective action.

STPA008-48X Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 27-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:: 27-Flexiwatt (Vertical)

STPA008-48X FAQ

1.How can I place an order for STPA008-48X through Aetrix?

Please submit a Request for Quotation (RFQ) for STPA008-48X 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 STPA008-48X reliable?

The price and inventory of STPA008-48X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPA008-48X is usually 5 days.

3.What payment methods are accepted for STPA008-48X?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPA008-48X transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STPA008-48X?

STPA008-48X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STPA008-48X 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 STPA008-48X?

For technical support, including STPA008-48X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPA008-48X requirements.

6.How does Aetrix verify that STPA008-48X is sourced from the original manufacturer or authorized distributors?

All STPA008-48X 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 STPA008-48X meets industry standards.

7.What is the process for return or replacement of STPA008-48X?

All STPA008-48X units undergo pre-shipment inspection (PSI). If there is an issue with STPA008-48X, 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 STPA008-48X part is unused and in its original packaging.

Return procedure for STPA008-48X:

1.Submit a request within 90 days.

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

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