STPA003OD-4WX - 4x45W Quad Channel Class AB Amplifier | STMicroelectronics
MPN: STPA003OD-4WX β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.44 | $5,440.00 |
Drop-in alternatives for STPA003OD-4WX β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TDA7560H
β Drop-Inβ 99,999 In Stock
$5.44 / Unit
View Datasheet βTDA7850
β Drop-Inβ 27,580 In Stock
$5.5 / Unit
View Datasheet βTDA7388
β Drop-Inβ 99,999 In Stock
$4.16 / Unit
View Datasheet βTDA7563B
β Drop-Inπ Reference alternative (not in catalog)
TDA7575B
β Drop-Inπ Reference alternative (not in catalog)
TDA7492
β Drop-Inπ Reference alternative (not in catalog)
STPA003OD-4WX Maximum Ratings & Electrical Characteristics
| Output Power per Channel | 45 W (4Ξ©, 14.4V, 10% THD) |
| Number of Channels | 4 |
| Supply Voltage Range | 6 V to 18 V |
| Output Type | Class AB |
| Load Impedance | 4 Ξ© |
| Total Harmonic Distortion (THD) | 0.03% (typical, 1kHz, 1W) |
| Signal-to-Noise Ratio (SNR) | 90 dB (typical) |
| Quiescent Current | 120 mA (typical) |
| Standby Current | 10 Β΅A (typical) |
| Operating Temperature Range | -40Β°C to +105Β°C |
| Package | Flexiwatt25 |
| Mounting Type | Through-Hole |
| Thermal Resistance (junction-to-case) | 1.5 Β°C/W |
| Protection Features | Short-circuit, thermal, load-dump |
| RoHS Status | Compliant |
STPA003OD-4WX Pin Configuration
| Pin 1 | OUT1+ β Positive output for channel 1 |
| Pin 2 | OUT1- β Negative output for channel 1 |
| Pin 3 | GND β Ground |
| Pin 4 | OUT2+ β Positive output for channel 2 |
| Pin 5 | OUT2- β Negative output for channel 2 |
| Pin 6 | VCC β Power supply |
| Pin 7 | OUT3+ β Positive output for channel 3 |
| Pin 8 | OUT3- β Negative output for channel 3 |
| Pin 9 | GND β Ground |
| Pin 10 | OUT4+ β Positive output for channel 4 |
| Pin 11 | OUT4- β Negative output for channel 4 |
| Pin 12 | VCC β Power supply |
| Pin 13 | STBY β Standby control (active high) |
| Pin 14 | MUTE β Mute control (active high) |
| Pin 15 | IN1 β Audio input for channel 1 |
| Pin 16 | IN2 β Audio input for channel 2 |
| Pin 17 | IN3 β Audio input for channel 3 |
| Pin 18 | IN4 β Audio input for channel 4 |
| Pin 19 | SVR β Supply voltage ripple rejection |
| Pin 20 | GND β Ground |
| Pin 21 | GND β Ground |
| Pin 22 | GND β Ground |
| Pin 23 | GND β Ground |
| Pin 24 | GND β Ground |
| Pin 25 | GND β Ground |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
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 Systems.
Car Radio Head Units
The STPA003OD-4WX is ideal for car radio head units, providing 4x45W output to drive door speakers. Its wide supply voltage range (6V-18V) ensures stable operation during engine start-stop, and the low quiescent current (120mA) reduces battery drain when the radio is idle. The standby and mute functions allow efficient power management, and the built-in protections (short-circuit, thermal, load-dump) safeguard the amplifier and speakers in automotive electrical environments. In a typical head unit, the amplifier is placed after the audio processor and before the speaker terminals, with a heatsink attached to the Flexiwatt25 tab to dissipate heat. The high SNR (90dB) and low THD (0.03%) ensure clear, distortion-free audio, making it a preferred choice for OEM and aftermarket car radios.
Recommended
External Automotive Amplifiers
In external automotive amplifiers, the STPA003OD-4WX can be used to drive subwoofers or full-range speakers with high power. Its 45W per channel output is sufficient for most aftermarket audio systems, and the Flexiwatt25 package allows for efficient heatsinking in compact enclosures. The amplifier's low distortion and high SNR ensure high-fidelity sound reproduction, which is critical for audiophile-grade car audio. When used in an external amplifier, the STPA003OD-4WX is typically powered from the car battery through a fuse, and the standby pin is connected to the head unit's remote turn-on signal. The thermal protection prevents damage during prolonged high-power operation, and the load-dump protection handles voltage spikes from the alternator. Designers should ensure adequate cooling and use thick PCB traces for the power and output stages to minimize resistance and heat buildup.
Recommended
Marine Audio Systems
The STPA003OD-4WX is suitable for marine audio systems due to its wide supply voltage range and robust protection features. Marine environments require components that can handle voltage fluctuations from battery systems and exposure to moisture. The amplifier's conformal coating (if applied) and thermal protection make it reliable in such conditions. In a marine audio system, the amplifier drives speakers on the deck or in the cabin, providing clear sound over engine noise. The low quiescent current is beneficial for battery-powered boats, and the standby function allows the system to be turned off when not in use. The Flexiwatt25 package can be mounted on a heatsink that is sealed against moisture, ensuring long-term reliability. Designers should use marine-grade connectors and wiring to prevent corrosion.
Recommended
Off-Road Vehicle Audio
For off-road vehicles, the STPA003OD-4WX provides robust audio amplification that can withstand harsh conditions such as dust, vibration, and temperature extremes. Its operating temperature range of -40Β°C to +105Β°C ensures reliable performance in desert heat or cold climates. The amplifier's protection features prevent damage from voltage spikes caused by rough terrain and alternator surges. In an off-road vehicle, the amplifier is often mounted in a sealed enclosure to protect it from dust and water. The high output power (45W per channel) is sufficient to overcome road and engine noise, providing clear audio for the driver and passengers. The standby and mute functions allow the system to be controlled via a switch or the head unit, reducing battery drain when the vehicle is off.
Recommended
Motorcycle Audio Systems
The STPA003OD-4WX can be used in motorcycle audio systems to provide high-power sound for riders. Its compact Flexiwatt25 package and low quiescent current make it suitable for space-constrained installations. The amplifier's wide supply voltage range (6V-18V) accommodates the voltage variations in motorcycle electrical systems, which can range from 12V to 14.4V. The thermal protection ensures safe operation even when the amplifier is mounted in a confined space with limited airflow. In a motorcycle audio system, the amplifier is typically powered from the battery and controlled by a handlebar-mounted switch. The high SNR and low THD ensure clear audio at high speeds, and the standby function helps preserve battery life when the engine is off.
Recommended
Home Theater Systems
Although designed for automotive use, the STPA003OD-4WX can be repurposed for home theater systems that require multiple channels of amplification. Its 4x45W output is suitable for driving surround sound speakers, and the low distortion ensures high-quality audio. The amplifier's wide supply voltage range allows it to be powered from a 12V DC supply, making it easy to integrate into DIY audio projects. In a home theater setup, the amplifier can be used to drive front, center, and rear speakers, with a separate subwoofer amplifier for low frequencies. The standby and mute functions can be controlled via a microcontroller or remote trigger. The Flexiwatt25 package requires a heatsink, which can be mounted on the chassis of the amplifier enclosure. The protection features ensure safe operation in a home environment.
Recommended
Recommended Products Summary
Engineering reference data for STPA003OD-4WX β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TDA7560 | TDA7850 | TDA7388 |
|---|---|---|---|---|
| Package | Flexiwatt25 | Flexiwatt25 | Flexiwatt25 | Flexiwatt25 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Output Power per Channel | 45 W | 45 W | 50 W | 45 W |
| Supply Voltage Range | 6 V to 18 V | 8 V to 18 V | 8 V to 18 V | 8 V to 18 V |
| Quiescent Current | 120 mA | 150 mA | 150 mA | 150 mA |
| Total Harmonic Distortion (THD) | 0.03% | 0.03% | 0.03% | 0.03% |
| Signal-to-Noise Ratio (SNR) | 90 dB | 90 dB | 90 dB | 90 dB |
| Standby Current | 10 Β΅A | 10 Β΅A | 10 Β΅A | 10 Β΅A |
Key Differentiators
- Wider supply voltage range (6V-18V) compared to alternatives (vs TDA7560)
- Lower quiescent current (120mA) than alternatives (vs TDA7850)
- Same package and pinout as TDA7560, but with better voltage tolerance (vs TDA7560)
Design Notes
The STPA003OD-4WX can dissipate up to 100W of power in worst-case conditions. The Flexiwatt25 package has a thermal resistance of 1.5Β°C/W (junction-to-case). To keep the junction temperature below 150Β°C, use a heatsink with a thermal resistance of 1.0Β°C/W or better. Ensure the heatsink is properly attached to the exposed metal tab with thermal compound. For continuous operation at high power, consider forced-air cooling.
Use thick copper traces (at least 2 oz) for the power supply and output pins to minimize resistance and heat buildup. Place the power supply decoupling capacitors (100Β΅F electrolytic and 100nF ceramic) as close as possible to the VCC pins. The ground pins should be connected to a solid ground plane to reduce noise and improve thermal performance. Keep audio input traces short and shielded to avoid interference.
Do not operate the amplifier without a load connected, as this can cause oscillation and damage. Ensure the standby and mute pins are properly controlled to avoid pop noise during power-up and shutdown. The supply voltage must not exceed 18V, as this can damage the device. Use a fuse in series with the power supply to protect against short circuits.
Compliance Information
RoHS compliant per STMicroelectronics product page. AEC-Q100 not applicable for this audio amplifier. Lead-free package.
