STPA001A - 4 x 50W Quad Bridge Audio Amplifier | STMicroelectronics
MPN: STPA001A ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
STPA001A Overview
An audio power amplifier is an integrated circuit that drives loudspeakers rather than only providing a low-power line signal. This STPA001A belongs to the class-AB power-amplifier hierarchy, combining MOSFET output stages with audio signal processing and protection functions. Its bridge topology allows differential speaker drive, while the Class AB biasing supports lower crossover distortion than a typical switching amplifier at the cost of higher standing dissipation.
Key verified features include output capability of 50 W per channel into 4 ohms at 14 V and 72 W per channel into 2 ohms at 14 V, low-voltage operation from 6 V to 18 V, excellent two-ohm drive capability, low output noise, and high disturbance immunity. The standby and mute controls support system-level power management, while clip and offset detection support diagnostic or protection functions.
The MOSFET output stage is designed for rail-to-rail output swing and high output current. STMicroelectronics describes the device as a class-AB audio power amplifier intended for high-power car radio applications. The datasheet also identifies its 27-Flexiwatt vertical package, which is a thermally relevant power-dissipation package and must be mounted with suitable copper and thermal design.
Typical uses include automotive head-unit amplifier stages, car-radio speaker drives, four-channel cabin audio systems, and other bridge-tied audio loads where a low-voltage battery supply is available. The four-channel architecture allows independent regulation of four speaker outputs when configured with the required passive network and load arrangement.
Designers should confirm the exact load impedance, supply voltage, thermal pad implementation, output-filter network, and pin-level application circuit in the STMicroelectronics datasheet before layout. Because power dissipation rises with voltage difference and output current, the PCB copper area and thermal path are critical. This page combines verified manufacturer and distributor information with engineering guidance for amplifier selection, thermal implementation, and application planning.
Drop-in alternatives for STPA001A — 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 STPA001A (same form factor and footprint) — differing in Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesSTPA001A Maximum Ratings & Electrical Characteristics
| Product Type | 4-channel Class AB MOSFET bridge power amplifier |
| Number of Channels | 4 channels |
| Output Power | 50 W per channel into 4 ohms at 14 V, 1 kHz |
| Maximum Output Power | 72 W per channel into 2 ohms at 14 V |
| Supply Voltage Range | 6 V to 18 V |
| Output Topology | Fully complementary P-channel/N-channel MOSFET bridge output |
| Technology | Multipower BCD |
| Load Capability | Excellent 2-ohm drive capability |
| Distortion | Hi-Fi Class distortion |
| Output Noise | Low output noise |
| Disturbance Immunity | Very high disturbance immunity |
| Standby Control | Standby input |
| Mute Control | Mute input |
| Clip Detection | Clip detection function |
| Offset Detection | Offset detection function |
| Package | 27-Flexiwatt vertical |
| Mounting Type | Surface-mount power package |
| Application | High-power car-radio audio |
STPA001A 27-flexiwatt vertical Pin Configuration Guide
Pin configuration for STPA001A (27-flexiwatt vertical package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for STPA001A.
Refer to the datasheet for full pin configuration.
Typical Applications
STPA001A is suitable for 6 applications: Automotive Head-Unit Amplifier, Car-Radio Speaker Drive, Four-Channel Cabin Audio, Low-Voltage Audio Amplifier, Automotive Speaker Output Protection, High-Power Audio Test Amplifier.
Automotive Head-Unit Amplifier
The STPA001A fits an automotive head-unit or digital-radio power stage because it combines four Class AB bridge channels with 6 V to 18 V operation and up to 50 W per channel into 4 ohms at 14 V. The device can drive four speaker outputs when the PCB includes the required protection, filtering, and thermal features. Its MOSFET output stage and mute/standby controls help integrate source-volume transitions without repeatedly powering the entire audio system. The main engineering constraint is heat: four high-power channels can impose substantial simultaneous dissipation, so the 27-Flexiwatt package must be connected to a carefully designed copper thermal path and verified under worst-case audio load.
Recommended
Car-Radio Speaker Drive
The STPA001A is directly aligned with the stated car-radio use case: it is a high-power Class AB bridge amplifier with 50 W per channel capability into 4 ohms at 14 V and excellent 2-ohm drive capability. A typical implementation would place the amplifier after the radio's volume and tone control, then use the documented output network to connect to the selected speaker load. Standby and mute inputs allow the radio to control amplifier state during ignition, source changes, and fault conditions. Because four channels may operate simultaneously, thermal layout and supply decoupling are as important as the audio signal path, especially in a sealed dashboard enclosure.
Recommended
Four-Channel Cabin Audio
The STPA001A's four-channel bridge architecture supports multi-speaker vehicle cabin layouts where independent front and rear amplification is useful. Its 50 W per-channel capability into 4 ohms at 14 V provides high output headroom for a 12 V automotive system, while the 72 W maximum capability into 2 ohms can serve lower-impedance installations when thermal conditions permit. A practical design must validate speaker impedance, amplifier stability, protection behavior, and connector current ratings. Use short, wide power traces and a dedicated return path to reduce voltage drop and audible channel imbalance.
Recommended
Low-Voltage Audio Amplifier
The STPA001A is suitable for battery-derived audio systems operating from 6 V to 18 V because the verified supply range matches low-voltage vehicle power environments. Its Class AB MOSFET output stage prioritizes analog audio performance and high output capability rather than the highest possible conversion efficiency. Designers should place input, control, and output-reference routing according to the manufacturer layout and decouple each supply node close to the power stage. If battery energy consumption is the dominant priority, compare the measured Class AB losses against a switching amplifier rather than assuming either topology is universally more efficient.
Recommended
Automotive Speaker Output Protection
The STPA001A's clip-detection and offset-detection functions are useful in an automotive audio design that needs to identify abnormal output conditions. Clip detection can flag a channel approaching its output limit, while offset detection can indicate an undesirable DC condition when used with the manufacturer's recommended external circuitry. These functions do not replace speaker protection, DC blocking, or fuse coordination, so they should be connected to the system controller according to the official datasheet. The four bridge outputs also require careful inspection of differential voltage, idle offset, and startup behavior before production.
Recommended
High-Power Audio Test Amplifier
The STPA001A can serve as a high-power Class AB output stage in laboratory audio equipment or speaker-test fixtures where low crossover distortion and substantial analog output power are important. Its four-channel configuration allows separate test channels, while mute and standby inputs help isolate the amplifier during setup. The same 6 V to 18 V supply and thermal constraints still apply, and the unit should be operated with a controlled load rather than an unrestricted speaker or unknown impedance. Use the official application circuit and pinout before connecting instrumentation, because incorrect output-network or grounding arrangements can invalidate measurements.
Recommended
Recommended Products Summary
Engineering reference data for STPA001A — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Product Type | 4-channel Class AB MOSFET bridge power amplifier |
| Brand | STMicroelectronics |
| Package | 27-Flexiwatt vertical |
| Supply Voltage | 6 V to 18 V |
| Output Power | 50 W per channel into 4 ohms at 14 V, 1 kHz |
| Maximum Output Power | 72 W per channel into 2 ohms at 14 V |
| Output Topology | Fully complementary P-channel/N-channel MOSFET bridge |
| Control Features | Standby, mute, clip detection, offset detection |
Key Differentiators
- High-power four-channel bridge architecture (vs STPA001AH)
- Automotive-oriented feature set (vs STPA001AEP)
- Low-voltage high-power MOSFET output stage (vs Generic four-channel audio amplifier)
Design Notes
The STPA001A is a high-power Class AB amplifier, so thermal design must be treated as a primary electrical requirement rather than a mechanical afterthought. The 27-Flexiwatt package is intended to dissipate heat through its power leads and PCB copper. Use the manufacturer land pattern, maximize the permitted copper area, provide a low-resistance ground return, and verify the hottest locations with thermocouples or thermal imaging under the worst channel-loading condition. Do not assume that a 50 W or 72 W headline rating can be sustained in a sealed enclosure without a verified thermal path.
Place local supply decoupling as close as practical to the STPA001A power pins, and follow the manufacturer recommended component values and layout. Keep the high-current bridge output paths short and wide, use adequately rated speaker connectors, and separate noisy power-return current from the audio input and control reference. The 6 V to 18 V supply range is suitable for automotive-style rails, but transient protection, reverse-battery protection, fuse coordination, and load dumping still require system-level design for vehicle use.
Use the official STPA001A application schematic and package drawing to preserve the intended pin assignments, output-network topology, feedback or gain configuration, and thermal land pattern. Keep standby, mute, clip, and offset traces away from high-current output loops. Because the supplied search data confirms the 27-Flexiwatt vertical package but does not expose the complete pin table, verify every connection against the manufacturer PDF before fabrication; do not infer pin numbers from a generic package library.
Do not substitute a generic four-channel amplifier merely because its wattage looks similar. A drop-in replacement must match the 27-Flexiwatt footprint, pin functions, supply behavior, bridge outputs, thermal limits, standby/mute logic, and protection implementation. Also avoid connecting multiple speaker impedances without checking the amplifier's stability and power-sharing assumptions. The verified data describes excellent 2-ohm drive capability, but continuous operation still requires compliance with the datasheet's load, temperature, and output-filter requirements.
Compliance Information
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than inferred from the manufacturer or package.
