STPA003OD-4WX - 4x52W Quad Class AB Amplifier | STMicroelectronics
MPN: STPA003OD-4WX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.52 | $9.52 |
| 10 | $8.57 | $85.70 |
| 100 | $7.62 | $762.00 |
| 500 | $6.86 | $3,430.00 |
| 1,000 | $6.19 | $6,190.00 |
STPA003OD-4WX Overview
A Class AB audio amplifier is a linear amplifier that conducts current through both output devices for more than half but less than the full cycle, offering a compromise between the efficiency of Class B and the linearity of Class A. In automotive audio systems, Class AB amplifiers are widely used for their low distortion and good sound quality, making them suitable for driving speakers in head units and external amplifiers. The STPA003OD-4WX fits into the hierarchy of audio power amplifiers, which are a subset of analog integrated circuits used in consumer and automotive entertainment systems.
Key features of the STPA003OD-4WX include a high output power of 52W per channel, a wide supply voltage range, and a low quiescent current for reduced power consumption during standby. It also features standby and mute functions for power management, and a full set of protections including short-circuit, thermal, and load-dump protection. The device is designed to meet automotive-grade quality standards, ensuring reliable operation in harsh environments.
Technically, the STPA003OD-4WX uses a complementary NPN/PNP output stage with a Darlington configuration to achieve high current gain and low output impedance. The amplifier incorporates a precision bandgap reference for stable biasing and a thermal shutdown circuit that protects the device from overheating. The Flexiwatt25 package provides a low thermal resistance of 1.5°C/W, allowing the amplifier to dissipate up to 100W of power without external heatsinking in moderate conditions.
Typical applications include car radio head units, external automotive amplifiers, and other in-vehicle audio systems where high power and low distortion are required. The device is also suitable for marine and off-road vehicle audio systems that demand robust performance. When designing with this amplifier, ensure adequate heatsinking and proper PCB layout to manage the high power dissipation, and use the standby and mute pins for efficient power management in battery-powered systems.
Drop-in alternatives for STPA003OD-4WX — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with STPA003OD-4WX (same form factor and footprint) — differing in Mounting Type, Package, Protection Features, Supply Voltage Range, Number of Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
STPA003OD-4WX
✅ Drop-In✓ In Stock
$6.19 / Unit
View Datasheet →TDA7802
✅ Drop-In📋 Reference alternative (not in catalog)
TDA7850
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.5 / Unit
View Datasheet →TDA7560H
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$5.44 / Unit
View Datasheet →STPA003OD-4WX Maximum Ratings & Electrical Characteristics
| Output Power | 4 x 52 W (4Ω, 14.4V, 10% THD) |
| Number of Channels | 4 (Quad) |
| Amplifier Class | Class AB |
| Supply Voltage Range | 6 V to 18 V |
| Output Type | BTL (Bridge-Tied Load) |
| Package | Flexiwatt25 (Vertical) |
| Mounting Type | Through-Hole |
| Operating Temperature Range | -40°C to +105°C |
| Standby Pin Compatibility | 3.3 V and 5 V compatible |
| Mute Pin Compatibility | 3.3 V and 5 V compatible |
| GSM Noise Immunity | Excellent |
| Protection Features | Short-circuit, thermal, load-dump |
| Offset Detector | Yes |
| RoHS Status | Compliant |
| Thermal Resistance | 1.5 °C/W |
STPA003OD-4WX Pin Configuration
| Pin 1 | OUT1+ — Positive output for channel 1 |
| Pin 2 | OUT1- — Negative output for channel 1 |
| Pin 3 | GND — Ground |
| Pin 4 | OUT2+ — Positive output for channel 2 |
| Pin 5 | OUT2- — Negative output for channel 2 |
| Pin 6 | VS — Supply voltage |
| Pin 7 | OUT3+ — Positive output for channel 3 |
| Pin 8 | OUT3- — Negative output for channel 3 |
| Pin 9 | GND — Ground |
| Pin 10 | OUT4+ — Positive output for channel 4 |
| Pin 11 | OUT4- — Negative output for channel 4 |
| Pin 12 | STBY — Standby control |
| Pin 13 | MUTE — Mute control |
| Pin 14 | DIAG — Diagnostic output |
| Pin 15 | IN1 — Input for channel 1 |
| Pin 16 | IN2 — Input for channel 2 |
| Pin 17 | IN3 — Input for channel 3 |
| Pin 18 | IN4 — Input for channel 4 |
| Pin 19 | GND — Ground |
| Pin 20 | VS — Supply voltage |
| Pin 21 | GND — Ground |
| Pin 22 | GND — Ground |
| Pin 23 | GND — Ground |
| Pin 24 | GND — Ground |
| Pin 25 | GND — Ground |
Typical Applications
STPA003OD-4WX is suitable for 6 applications: Car Radio Head Units, External Automotive Amplifiers, Marine Audio Systems, Off-Road Vehicle Audio, Motorcycle Audio Systems, Home Theater Amplifiers.
Car Radio Head Units
The STPA003OD-4WX is designed for high-power car radio head units, delivering 4 x 52W into 4Ω speakers. Its low voltage operation supports start-stop battery profiles, and its excellent GSM noise immunity ensures clean audio in automotive environments. The amplifier's standby and mute pins allow efficient power management, reducing battery drain when not in use.
Recommended
External Automotive Amplifiers
In external automotive amplifiers, the STPA003OD-4WX provides high output power and low distortion, making it suitable for driving subwoofers and full-range speakers. Its robust protection features, including short-circuit and thermal protection, ensure reliable operation in demanding conditions. The Flexiwatt25 package allows efficient heat dissipation, enabling continuous high-power output.
Recommended
Marine Audio Systems
The STPA003OD-4WX is suitable for marine audio systems due to its wide supply voltage range and robust design. It can handle voltage fluctuations common in marine environments, and its protection features guard against short circuits and overheating. The amplifier's low quiescent current helps conserve battery power in boats and other watercraft.
Recommended
Off-Road Vehicle Audio
For off-road vehicles, the STPA003OD-4WX offers high power output and durability. Its ability to operate at low voltages (down to 6V) is beneficial during engine start-stop cycles. The amplifier's excellent GSM noise immunity ensures clear audio even with strong electromagnetic interference from vehicle electronics.
Recommended
Motorcycle Audio Systems
The STPA003OD-4WX can be used in motorcycle audio systems where space is limited but high power is desired. Its compact Flexiwatt25 package and efficient heat dissipation make it suitable for mounting in tight enclosures. The low voltage operation is ideal for 12V motorcycle electrical systems.
Recommended
Home Theater Amplifiers
Although designed for automotive use, the STPA003OD-4WX can be adapted for home theater amplifiers requiring multi-channel output. Its high power and low distortion make it suitable for driving home speakers. However, the supply voltage range and protection features are optimized for automotive environments, so additional circuitry may be needed for home use.
Recommended
Recommended Products Summary
Engineering reference data for STPA003OD-4WX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TDA7802 | TDA7850 | TDA7560H |
|---|---|---|---|---|
| Package | Flexiwatt25 | Flexiwatt25 | Flexiwatt25 | Flexiwatt25 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Output Power (4Ω, 14.4V, 10% THD) | 4 x 52 W | 4 x 45 W | 4 x 50 W | 4 x 40 W |
| Supply Voltage Range | 6V to 18V | 6V to 18V | 8V to 18V | 8V to 18V |
| Number of Channels | 4 | 4 | 4 | 4 |
| Amplifier Class | Class AB | Class AB | Class AB | Class AB |
| Standby Pin | Yes | Yes | Yes | Yes |
| Mute Pin | Yes | Yes | Yes | Yes |
Key Differentiators
- High output power of 4 x 52W (vs TDA7560H)
- Low voltage operation down to 6V (vs TDA7850)
- Excellent GSM noise immunity (vs TDA7802)
Design Notes
The STPA003OD-4WX can dissipate significant power, especially at high output levels. With a thermal resistance of 1.5°C/W, a proper heatsink is essential. For 4 x 52W output, the total power dissipation can exceed 100W, so use a heatsink with a thermal resistance of less than 1°C/W to keep the junction temperature within limits.
Ensure the exposed metal tab of the Flexiwatt25 package is soldered to a large copper area on the PCB to aid heat dissipation. Place decoupling capacitors close to the supply pins to minimize voltage ripple. Use short, wide traces for high-current output paths to reduce inductance and resistance.
The standby and mute pins are 3.3V and 5V compatible, but RC cells must be used to smooth transitions and prevent audible transient noise. A time constant slower than 2.5V/ms is suggested for the standby pin and 0.5V/ms for the mute pin. Avoid applying voltages above the absolute maximum ratings to prevent damage.
Compliance Information
RoHS compliance indicated in distributor listings. AEC-Q100 not applicable for audio amplifier ICs.
