STPA001H - 4 x 50W Class AB Audio Amplifier | STMicroelectronics
MPN: STPA001H ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
STPA001H Overview
A power audio amplifier is an integrated analog device that drives loudspeakers from a lower-voltage audio input while delivering the voltage and current required by the load. The STPA001H uses four independent Class AB output channels in a bridge-tied-load arrangement. In this topology, each channel drives the two terminals of a speaker differentially, improving output capability while avoiding a direct ground connection at the load.
Key verified features include four 50 W outputs at a 4 Ω load, Class AB operation, 6 V to 18 V supply operation, and 25-Flexiwatt horizontal construction. The standby and mute controls support system-level power management and signal suppression. Clip detection and the diagnostics output provide status information that can be monitored by a vehicle or audio-system controller. The manufacturer describes the STPA001 family as using MOSFET technology for high sound quality and high-power car-radio applications.
The device is intended for four-channel audio architectures in which multiple loudspeaker loads must be driven from one integrated power stage. Typical uses include car-radio amplifiers, automotive sound systems, and other bridge-tied-load audio equipment. The 25-Flexiwatt package is a substantial thermal and mechanical solution compared with small surface-mount amplifier packages, making it appropriate for designs where substantial output power and heat-spreading capability are priorities.
When designing around STPA001H, preserve the datasheet supply range and account for the power dissipated by the four Class AB output stages. Speaker wiring, grounding, and decoupling should be arranged to minimize hum and switching-related disturbance. The standby and mute pins should be driven according to the manufacturer’s recommended logic levels, while clip and diagnostics signals should be incorporated into system monitoring where useful.
This page consolidates verified distributor and manufacturer information with application guidance, comparison fields, and design notes intended to help engineers evaluate STPA001H for high-power automotive audio designs. It does not infer electrical, thermal, or pin-level values that were not present in the supplied source data.
Drop-in alternatives for STPA001H — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesSTPA001H Maximum Ratings & Electrical Characteristics
| Product Type | Quad Class AB BTL audio power amplifier |
| Number of Channels | 4 channels |
| Maximum Output Power | 4 x 50 W at 4 ohm |
| Supply Voltage Range | 6 V to 18 V |
| Output Configuration | Bridge-tied-load (BTL) |
| Amplifier Class | Class AB |
| Output Technology | MOSFET |
| Standby Input | Available |
| Mute Input | Available |
| Clip Detection | Available |
| Diagnostics Output | Available |
| Offset Detector | Available only for Flexiwatt27 package |
| Package | 25-Flexiwatt horizontal |
| Mounting Type | Through-hole with formed leads |
| Terminal Count | 25 terminals |
| Maximum Operating Temperature | 150 C |
| Part Status | Active |
STPA001H 25-flexiwatt horizontal Pin Configuration Guide
Pin configuration for STPA001H (25-flexiwatt horizontal 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 STPA001H.
Refer to the datasheet for full pin configuration.
Typical Applications
STPA001H is suitable for 6 applications: Automotive Four-Channel Radio Amplifier, Car Speaker Multi-Zone Audio System, Automotive Head Unit Power Stage, External Automotive Audio Amplifier, High-Power Audio Test and Demonstration Board, Automotive Audio Noise and Clipping Monitor.
Automotive Four-Channel Radio Amplifier
STPA001H fits a high-power car-radio power stage because it combines four independent Class AB amplifiers with 4 x 50 W output capability at a 4 Ω load. Each channel can feed a separate speaker load in a bridge-tied-load arrangement, reducing the need for several discrete power amplifiers in a multi-zone vehicle audio design. The 6 V to 18 V supply range is appropriate for systems built around an automotive low-voltage power environment. Standby and mute inputs allow the amplifier to be controlled by the radio or vehicle head unit, while clip detection and diagnostics provide useful status signals for system supervision. The designer should verify thermal conditions, speaker impedance, and all protection requirements against the manufacturer datasheet.
Recommended
Car Speaker Multi-Zone Audio System
The four-channel BTL architecture makes STPA001H useful for vehicle audio systems that distribute sound to front and rear speaker zones. The verified 4 x 50 W rating at 4 Ω provides a clear output-power target for each channel, while standby and mute functions let the vehicle controller reduce amplifier activity without redesigning the audio signal path. Because Class AB power stages can dissipate substantial heat, the implementation must include adequate copper or heatsinking around the 25-Flexiwatt horizontal package. Speaker wiring should use the manufacturer-defined BTL connections, and the designer should confirm maximum excursion, impedance, and channel-balance requirements for the selected loudspeakers.
Recommended
Automotive Head Unit Power Stage
STPA001H can serve as the final loudspeaker-driving stage in an automotive head unit when the design needs four high-power BTL outputs rather than a low-power line-level amplifier. Its standby input supports head-unit power sequencing, and its mute input supports local signal suppression during navigation prompts, parking, or source changes. The 6 V to 18 V operating range should be reconciled with the vehicle electrical environment and the regulator or battery-protection design. Clip and diagnostics outputs can be routed to a system controller for fault indication. Final use requires the official pinout and application circuit because those connection details were not included in the supplied search snippets.
Recommended
External Automotive Audio Amplifier
The high-output, four-channel capability of STPA001H makes it suitable for an external vehicle amplifier module that drives multiple loudspeakers from a compact power-amplifier board. The horizontal 25-Flexiwatt package is formed for through-hole assembly, which can simplify mechanical assembly in a ruggedized module when compared with a fine-pitch surface-mount power package. The device’s MOSFET Class AB topology is intended for sound-quality-oriented automotive audio, while standby, mute, clip detection, and diagnostics features help the surrounding system manage operating states. Mechanical design should still provide heat spreading, vibration tolerance, and speaker-wire strain relief in accordance with the final enclosure and automotive requirements.
Recommended
High-Power Audio Test and Demonstration Board
STPA001H is also appropriate for a controlled audio power-stage demonstration or test board where four BTL outputs are useful for verifying speaker loading, mute behavior, standby control, and clip or diagnostics signaling. The verified 4 x 50 W capability at 4 Ω makes the device suitable for resistance-loaded test conditions when the test equipment and cooling system are appropriately designed. Designers should use controlled test waveforms, begin at reduced output levels, and monitor device temperature because the supplied data does not include a verified thermal-resistance curve. The test board should preserve the manufacturer’s recommended decoupling and grounding approach and should not substitute a single-ended speaker connection for the specified BTL arrangement.
Recommended
Automotive Audio Noise and Clipping Monitor
STPA001H can be used in an automotive audio design that needs both power amplification and basic output-status monitoring. The device includes clip detection and a diagnostics output, allowing a controller to identify overload-related conditions while the four Class AB channels drive BTL loudspeaker loads. This is useful in a vehicle infotainment or radio design where excessive clipping can degrade sound quality and potentially stress downstream audio processing. The monitor logic should be implemented only after confirming signal polarity, electrical levels, and timing in the manufacturer datasheet. The design must also distinguish clip or diagnostics indications from thermal or speaker-load faults, which are separate protection concerns.
Recommended
Recommended Products Summary
Engineering reference data for STPA001H — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Package | 25-Flexiwatt horizontal |
| Brand | STMicroelectronics |
| Channel Count | 4 channels |
| Maximum Output Power | 4 x 50 W at 4 ohm |
| Supply Voltage | 6 V to 18 V |
| Output Topology | Bridge-tied-load (BTL) |
| Amplifier Class | Class AB |
| Output Technology | MOSFET |
| Control and Diagnostic Features | Standby, mute, clip detection, diagnostics output |
Key Differentiators
- Four independently addressed high-power BTL channels (vs No verified alternative MPNs were supplied)
- Automotive-oriented control and diagnostic features (vs No verified alternative MPNs were supplied)
- MOSFET Class AB output stage in a formed-lead power package (vs No verified alternative MPNs were supplied)
Design Notes
Estimated: the four output channels can dissipate substantial power when the amplifier operates near its 4 x 50 W rating, and the supplied data does not include a verified thermal-resistance value. Treat the 25-Flexiwatt horizontal package as a thermal design element rather than only a mechanical outline. Confirm channel dissipation for the actual load, supply voltage, signal content, and ambient temperature using the manufacturer datasheet, then size copper area or a heatsink and enclosure airflow accordingly.
Keep the STPA001H supply design within the verified 6 V to 18 V range and validate the automotive supply transients ahead of the amplifier. The supplied data does not specify input current limits, regulator requirements, or protection thresholds, so those values must come from the manufacturer datasheet. Place input and output decoupling close to the device according to the official application circuit, and keep high-current speaker returns separate from sensitive audio-signal returns to reduce ground noise.
Use the manufacturer’s 25-Flexiwatt horizontal footprint and pin numbering without substituting a generic power-package land pattern. Verify lead spacing, body outline, thermal-tab or exposed-area requirements, and the specified BTL speaker connections before layout release. Because the supplied search data confirms a through-hole formed-lead package but does not provide a complete pin table, do not finalize the schematic or PCB footprint from this summary alone; use the official datasheet drawing.
Route each BTL speaker output as a balanced power pair and avoid sharing either output conductor with an unrelated signal path. Keep the amplifier’s power ground, speaker-return paths, and audio-input ground arrangement consistent with the manufacturer reference layout. The four channels and their load connections should be reviewed for imbalance, accidental shorts, and connector current capability. Since no verified pinout was available in the supplied snippets, final routing must be checked against the official datasheet symbol and package drawing.
Do not connect the speaker as a single-ended load to ground merely because the device is described as an audio amplifier. STPA001H is a BTL amplifier, so each speaker is driven between the appropriate differential output terminals. Also do not infer thermal safety from the 150 C maximum operating temperature alone: that is a maximum rating, not a design target. Confirm standby and mute logic levels, diagnostics polarity, and unused-channel behavior against the official datasheet before connecting a vehicle head unit.
Compliance Information
The supplied verified data identifies automotive car-radio application and active part status but does not provide RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations. Compliance fields remain unknown rather than assumed.
