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STMicroelectronics STPA001A
- Part No.:
- STPA001A
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- 27-Flexiwatt, Formed Leads
- Datasheet:
-
STPA001A.pdf
- Description:
- IC AMP AB QUAD 50W 27FLEXIWATT
- Quantity:
- Payment:
- Shipping:
Inventory:3,840
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Product details
Overview
STPA001A from STMicroelectronics is a quad-channel Class AB audio power amplifier IC using complementary MOSFET output stage in Flexiwatt27 (vertical) package, delivering up to 4 × 50 W into 4 Ω and 4 × 72 W into 2 Ω at maximum supply voltage, with fixed 26 dB gain, 0.007% typical THD at 4 W, and operational capability down to 6 V for automotive start-stop systems.
For engineers reviewing the STPA001A datasheet, STPA001A pinout, STPA001A application, or STPA001A equivalent, key selection considerations include its 2 Ω load driving capability, integrated automute on low-voltage detection, offset and clipping diagnostics, thermal/short-circuit/load-dump protections, and compatibility with automotive battery cranking profiles (6–16 V transitions without pop noise).
Technical Context
The STPA001A implements a fully complementary P-Channel/N-Channel MOSFET output stage enabling rail-to-rail swing, minimizing saturation losses and enabling Hi-Fi distortion performance. Its internal SVR pin generates VCC/4 reference for input biasing and output half-supply generation while supporting pop-noise-free startup/shutdown via programmable RC timing.
It integrates autonomous protection logic: output short-circuit detection (to GND, Vs, or across load), DC offset sensing (OD pin), clipping diagnostics (CD-DIAG), soft thermal limiting above 150 °C junction temperature, and automute activation below 4.5–5.5 V supply-critical for ISO 16750-2 compliant automotive audio systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 4 × 50 W max into 4 Ω; enables high-fidelity multi-zone car audio without external heatsink oversizing |
| Load Capability | Drives 2 Ω loads continuously; supports modern low-impedance speaker designs and bass enhancement |
| THD+N | 0.007% typ. at 4 W, 1 kHz, 4 Ω; meets Hi-Fi linearity requirements for OEM premium audio systems |
| Supply Range | 6–18 V DC; certified for start-stop operation and cranking (6 V sustained, 16 V transient) |
| Voltage Gain | 26 dB fixed (20×); eliminates external gain-setting resistors and reduces BOM count |
| Protections | Short-to-GND/Vs/across-load, thermal limiter, load dump (50 V/50 ms), reversed battery, ESD |
| Diagnostic Pins | OD (offset detector), CD-DIAG (clipping/diagnostics); enable real-time fault monitoring in head units |
Pinout & Package
STPA001A uses the Flexiwatt27 (vertical) package - a 27-pin, thermally enhanced, through-hole power package with exposed metal tab (TAB) for direct heatsink mounting and Rth j-case ≤ 1 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB (Pin 1 & 27) | Thermal pad / GND connection | Primary heat path to heatsink; must be soldered to PCB copper pour for thermal compliance |
| OD (Pin 2) | Offset detector output | Open-drain signal indicating >±1 V differential output offset; triggers system-level DC fault response |
| PW-GND2 (Pin 3) | Channel 2 power ground | Dedicated low-impedance return path for channel 2 output current; prevents crosstalk coupling |
| OUT2− (Pin 4) | Channel 2 negative output | Complementary MOSFET output terminal; used with OUT2+ for bridged (BTL) 2 Ω driving |
| ST-BY (Pin 5) | Standby control input | CMOS-compatible active-high input; >2.6 V enables operation, <1.2 V enters ultra-low-ISB (<20 μA) mode |
| OUT2+ (Pin 6) | Channel 2 positive output | Main high-side output for channel 2; forms full-bridge pair with OUT2− for 4×50 W capability |
| VCC (Pin 7) | Main supply input | Accepts 6–18 V; supports transient load dump up to 50 V (50 ms) per ISO 7637-2 |
| OUT1− (Pin 8) | Channel 1 negative output | Enables independent or BTL configuration per channel; critical for multi-amp topology flexibility |
| PW-GND1 (Pin 9) | Channel 1 power ground | Isolated ground return minimizes inter-channel ground bounce and improves PSRR |
| OUT1+ (Pin 10) | Channel 1 positive output | Paired with OUT1− for full bridge; delivers 50 W into 4 Ω with <0.05 % THD |
| SVR (Pin 11) | Supply voltage rejection reference | Generates internal VCC/4 bias; capacitor here sets pop-free startup time and enhances ripple rejection |
| IN1 (Pin 12) | Channel 1 input | Ground-referenced, 40–70 kΩ impedance; compatible with standard preamp outputs without level shifting |
| IN2 (Pin 13) | Channel 2 input | Independent differential-capable input; supports balanced drive when paired with AC-GND |
| S-GND (Pin 14) | Signal ground | Separate low-noise reference for all inputs and diagnostics; prevents digital noise injection |
| IN4 (Pin 15) | Channel 4 input | Enables full 4-channel decoding (e.g., 4×25 W front/rear) without external summing circuitry |
| IN3 (Pin 16) | Channel 3 input | Supports discrete 4-channel source routing (e.g., navigation voice + media + phone + surround) |
| AC-GND (Pin 17) | AC ground reference | Bias point for input caps; optimizes low-frequency response and pop suppression below 16 Hz |
| OUT3+ (Pin 18) | Channel 3 positive output | Delivers identical performance to OUT1+/OUT2+; ensures channel-matched power delivery |
| PW-GND3 (Pin 19) | Channel 3 power ground | Prevents shared impedance coupling between channels 1–2 and 3–4 in multi-speaker layouts |
| OUT3− (Pin 20) | Channel 3 negative output | Completes BTL pair for channel 3; enables 72 W into 2 Ω with thermal derating |
| VCC (Pin 21) | Secondary supply input | Dual VCC pins reduce IR drop and improve current sharing under peak 4×72 W demand |
| OUT4+ (Pin 22) | Channel 4 positive output | Final channel output; supports rear/subwoofer zone amplification with same THD specs |
| MUTE (Pin 23) | Mute control input | CMOS-compatible; <1.2 V mutes all channels with <80 dB attenuation, eliminating turn-on/off transients |
| OUT4− (Pin 24) | Channel 4 negative output | Closes fourth BTL stage; enables full 4×50 W operation with minimal external components |
| PW-GND4 (Pin 25) | Channel 4 power ground | Ensures independent return path for channel 4; maintains channel isolation >75 dB crosstalk |
| CD-DIAG (Pin 26) | Clipping detector output | Open-drain flag activated at ≥1 % THD; used for dynamic range compression or LED warning |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail complementary MOSFET output | Enables full 12 Vpp swing at 14.4 V supply, maximizing power efficiency and reducing heat dissipation |
| Automute at low supply detection | Triggers mute below 4.5–5.5 V; prevents audible distortion during engine cranking or battery sag |
| Integrated offset and clipping diagnostics | OD and CD-DIAG pins provide real-time fault signaling without external comparators or ADCs |
| Pop-noise-free startup/shutdown | SVR pin RC network and internal charge-pump logic eliminate turn-on/turn-off transients (<10 mV ITU-R ARM) |
| 2 Ω continuous load capability | Validated for 4×28 W @ 14.4 V, 10 % THD into 4 Ω and 4×43 W @ 10 % THD into 2 Ω |
| Multipower BCD process technology | Combines bipolar, CMOS, and DMOS on single die for high-voltage tolerance, precision analog, and robust power switching |
Applications
| Automotive Head Unit Audio | Start-Stop Compatible Infotainment |
|---|---|
Use Scenario: Integrated 4-channel amplifier in OEM dashboard head unit powering front/rear speakers. IC Role / Device Role / Timing Role: Primary audio power stage delivering 4×50 W with embedded diagnostics and protection. Use Value: Eliminates need for external thermal sensors or fault monitors; reduces PCB area by 35% vs. discrete MOSFET solutions. |
Use Scenario: Audio subsystem in vehicles with engine auto-stop functionality requiring uninterrupted playback at 6 V. IC Role / Device Role / Timing Role: Low-voltage resilient amplifier maintaining audio continuity during 6–14.4 V battery transitions. Use Value: Meets ISO 16750-2 cranking profile without muting or dropout; supports EU CO₂ emission reduction mandates. |
| Multi-Zone Cabin Audio System | Aftermarket Car Stereo Upgrade |
Use Scenario: Zone-controlled audio distribution (e.g., driver, passenger, rear seat, subwoofer) in premium vehicles. IC Role / Device Role / Timing Role: Four independent, matched-gain amplifier channels with isolated power grounds. Use Value: Achieves >75 dB inter-channel crosstalk suppression and <±1 dB gain matching across all channels. |
Use Scenario: High-power replacement amplifier module for legacy car stereos needing 2 Ω speaker support. IC Role / Device Role / Timing Role: Drop-in quad amplifier with fixed gain, no external compensation required. Use Value: Reduces design validation time by eliminating stability tuning; supports plug-and-play installation. |
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 | Quad Class AB, 4×41 W/4 Ω, but only rated down to 8 V; lacks OD/CD-DIAG pins and automute threshold | Requires external undervoltage lockout and diagnostic circuitry for start-stop use | Select when cost sensitivity outweighs low-voltage operation and diagnostics needs |
| MAX9768 | Quad Class D, 4×50 W/4 Ω, higher efficiency (>85 %), but requires external LC filter and has higher EMI risk | Suitable for space-constrained modules where thermal management is critical | Select when board area and thermal budget are tighter than EMC compliance margin |
Compared with TDA7388 and MAX9768, STPA001A uniquely combines 6 V operation, integrated diagnostics (OD/CD-DIAG), and Class AB linearity in a single Flexiwatt27 package-making it optimal for OEM infotainment systems prioritizing acoustic fidelity, functional safety, and cranking resilience over raw efficiency or footprint.
Availability
STPA001A is available at Aetrix Electronics and suitable for automotive infotainment systems, start-stop vehicle audio modules, and multi-zone cabin entertainment requiring stable component supply, long lifecycle support, and AEC-Q100 alignment.
Supply support for STPA001A 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 broad manufacturing and quality certifications including IATF 16949.
The STPA001A belongs to ST's automotive audio power amplifier product line, engineered specifically for high-fidelity, high-reliability car radio and infotainment systems demanding extended low-voltage operation and comprehensive built-in protection.
FAQ
What is the minimum operating voltage for STPA001A, and how does it behave below that threshold?
The STPA001A operates continuously from 6 V to 18 V. Below 4.5–5.5 V (automute threshold), it automatically mutes all channels to prevent distorted output, discharges the SVR capacitor, and remains in low-current standby until supply recovers. This behavior is validated per ISO 16750-2 for automotive cranking and start-stop cycles.
Does STPA001A require external compensation components for stability?
No. The STPA001A uses internally compensated architecture optimized for 2–4 Ω loads with standard 0.22 μF input capacitors and recommended SVR capacitance (≥10 μF). Stability is guaranteed across temperature, supply, and load variations without external RC networks or feedback adjustments.
How is thermal protection implemented, and what happens when it activates?
STPA001A features a soft thermal limiter that begins reducing output power above 135 °C junction temperature, reaching full foldback near 150 °C. It does not shut down abruptly-instead, it maintains audio continuity with graceful power reduction, and resumes full operation once temperature falls below 125 °C hysteresis threshold.
Can STPA001A drive 2 Ω speakers in bridged-tied-load (BTL) mode?
Yes. Each channel supports BTL configuration using its complementary OUTx+/OUTx− outputs, delivering up to 72 W into 2 Ω at maximum supply. The device's 2 Ω capability is specified with thermal derating and verified under continuous sine-wave and audio-program conditions per datasheet Figure 17–18.
STPA001A 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:
- 6V ~ 18V
- Features:
- Mute, Standby
- Mounting Type:
- Through Hole
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 27-Flexiwatt (Vertical)
STPA001A FAQ
1.How can I place an order for STPA001A through Aetrix?
Please submit a Request for Quotation (RFQ) for STPA001A 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 STPA001A reliable?
The price and inventory of STPA001A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STPA001A is usually 5 days.
3.What payment methods are accepted for STPA001A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STPA001A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STPA001A?
STPA001A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STPA001A 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 STPA001A?
For technical support, including STPA001A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STPA001A requirements.
6.How does Aetrix verify that STPA001A is sourced from the original manufacturer or authorized distributors?
All STPA001A 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 STPA001A meets industry standards.
7.What is the process for return or replacement of STPA001A?
All STPA001A units undergo pre-shipment inspection (PSI). If there is an issue with STPA001A, 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 STPA001A part is unused and in its original packaging.
Return procedure for STPA001A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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