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STMicroelectronics TDA7391PD
- Part No.:
- TDA7391PD
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- 20-SOIC (0.433", 11.00mm Width) Exposed Pad
- Datasheet:
-
TDA7391PD.pdf
- Description:
- IC AMP AB MONO 40W POWERSO-20
- Quantity:
- Payment:
- Shipping:
Inventory:2,849
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Product details
Overview
TDA7391PD from STMicroelectronics is a 32 W bridge-type Class AB audio power amplifier designed for high-power car radio applications. It delivers 32 W into 3.2 Ω at 14.4 V, features differential or single-ended input support, fixed 30 dB gain, and integrated clipping detection (CD pin). Its PowerSO20 (slug-up) package enables efficient thermal dissipation in automotive head unit boosters.
For engineers reviewing the TDA7391PD datasheet, TDA7391PD pinout, TDA7391PD application, or TDA7391PD equivalent, key selection considerations include output power vs. load impedance, programmable mute/standby timing, rail-to-rail bridge output swing without bootstrap capacitors, and built-in protection against short circuit, overtemperature, and load dump.
Technical Context
The TDA7391PD implements a fully complementary PNP/NPN output stage in bridge configuration, enabling 32 W into 3.2 Ω with no external bootstrap or compensation components. Its internal fixed 30 dB gain and differential input architecture support both single-ended and balanced signal sources while maintaining ≥65 dB CMRR at 1 kHz.
Protection logic includes real-time clipping detection (10% THD threshold), thermal shutdown at 160 °C, and fault tolerance for short-to-ground, short-to-VS, and open-GND conditions. The ST-BY and MUTE pins accept CMOS-level control with programmable turn-on/off delay via external R-C network on pins 8 and 9.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 32 W @ 3.2 Ω, 14.4 V, 1 kHz, 10% THD - enables high-SPL audio in compact car radio designs |
| Supply Voltage Range | 8–18 V - compatible with automotive battery transients up to 18 V operating voltage |
| Voltage Gain | 29.5–30.5 dB (typ. 30 dB) - eliminates need for external gain-setting resistors |
| Input Impedance | 36–60 kΩ (differential), 30–55 kΩ (single-ended) - minimizes source loading across OEM audio front-ends |
| Clipping Detection | CD pin asserts low at 10% THD - enables external gain compression or LED indicator without signal monitoring |
| Thermal Resistance | Rth j-case ≤ 2 °C/W - supports >32 W continuous dissipation with slug-up heatsinking |
| Standby Current | ≤100 µA - meets automotive quiescent current requirements during ignition-off state |
Pinout & Package
Package: PowerSO20 (slug-up), thermally enhanced surface-mount package with exposed metal slug for direct heatsink attachment. Dimensions per JEDEC MO-220, 15.6 × 10.2 × 4.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10, 11, 20 | GND | Power ground return path for output stage and bias circuits; requires low-inductance PCB layout |
| 2, 19 | OUTPUTS | Bridge outputs driving speaker load differentially; rail-to-rail swing without bootstrap caps |
| 4 | STAND-BY | CMOS-compatible enable input; low = standby mode (≤100 µA ISB), high = active operation |
| 5, 16 | +VS | Main supply input (8–18 V); accepts load-dump transients up to 50 V for 50 ms |
| 8 | SYNC | Resistor connection to GND sets bias current for C3, determining mute/standby timing ramp rate |
| 9 | MUTE | Capacitor-to-GND sets mute/standby time constant; enables pop-free startup/shutdown |
| 12 | S-GND | Signal ground reference for inputs and bias circuitry; separate from power GND to reduce noise coupling |
| 14, 15 | INPUTS | Differential input pair; supports single-ended use with matched impedance to S-GND |
| 17 | CD | Open-collector clipping detector output; sinks current when output distortion ≥10% |
Key Features
| Feature | Design Value |
|---|---|
| No external bootstrap capacitors | Rail-to-rail bridge output swing achieved via internal charge pump elimination - reduces BOM count and board area |
| Internally fixed 30 dB gain | Removes gain-setting resistor network - improves production consistency and eliminates gain drift with temperature |
| Programmable mute/standby timing | External R-C on pins 8/9 allows precise control of turn-on/off transient suppression - prevents audible pop in head units |
| Integrated clipping detection | CD pin provides real-time 10% THD flag - enables automatic gain reduction or status indication without external ADC |
| Full short-circuit protection | Withstands shorts to GND, VS, and across load - ensures reliability in harsh automotive wiring environments |
Applications
| Car Radio Booster Amplifier | OEM Head Unit Output Stage |
|---|---|
|
Use Scenario: High-fidelity audio amplification in mid-tier automotive infotainment systems requiring >30 W into low-impedance speakers. IC Role / Device Role / Timing Role: Bridge-output Class AB power amplifier delivering full-range audio drive with integrated protection and diagnostics. Use Value: Eliminates external gain-setting and bootstrap components while providing clipping feedback for dynamic range management. |
Use Scenario: Final output stage in factory-installed head units where space, thermal performance, and EMI robustness are critical. IC Role / Device Role / Timing Role: Primary audio power driver with CMOS-compatible standby control and load-dump tolerant supply interface. Use Value: Slug-up PowerSO20 package enables direct heatsink mounting; 2 °C/W Rth j-case sustains 32 W output under 85 °C case temperature. |
| Aftermarket Audio Processor Interface | Compact Vehicle Entertainment System |
|
Use Scenario: Integration between DSP-based audio processors and passive speaker arrays in retrofit installations. IC Role / Device Role / Timing Role: Differential-input power amplifier accepting balanced line-level signals while rejecting common-mode noise. Use Value: 65 dB CMRR at 1 kHz ensures clean signal transfer from processor outputs, even in electrically noisy vehicle cabins. |
Use Scenario: Space-constrained multimedia systems in motorcycles, RVs, or commercial vehicles with limited chassis grounding options. IC Role / Device Role / Timing Role: Single-chip audio power solution with open-GND fault detection and dual ground (power + signal) isolation. Use Value: Independent S-GND terminal prevents ground-loop hum; open-GND protection avoids latch-up during intermittent chassis connections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bridge audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7388 | 4×41 W quad channel, 32-pin HTSSOP; lower per-channel power density, no integrated clipping detector | Designed for multi-zone OEM head units requiring four independent channels | Select when system requires multiple amplified zones and board space permits larger footprint |
| STA559BW | Digital input (I²S), 2×60 W Class D; higher efficiency (>80%), but requires external gate drivers and LC filters | Targeted at low-heat, high-efficiency infotainment platforms with digital audio sources | Select when system uses I²S output and prioritizes thermal management over analog input flexibility |
Compared with TDA7391PD, TDA7388 offers multi-channel integration at the cost of missing diagnostic features, while STA559BW delivers superior efficiency and power density but increases design complexity with digital interface and filtering requirements.
Availability
TDA7391PD is available at Aetrix Electronics and suitable for car radio booster amplifiers, OEM head unit output stages, aftermarket audio processor interfaces, and compact vehicle entertainment systems requiring stable component supply and automotive-grade thermal resilience.
Supply support for TDA7391PD 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.
The TDA7391PD belongs to ST's automotive audio power amplifier product line, engineered specifically for high-reliability, high-power analog audio output in 12 V vehicle electrical environments with stringent thermal and fault-tolerance requirements.
FAQ
What is the maximum safe supply voltage for continuous operation of the TDA7391PD?
The TDA7391PD has an absolute maximum DC supply voltage rating of 28 V, but its specified operating supply voltage range is 8–18 V. Continuous operation above 18 V violates the device's operational specification and risks premature thermal shutdown or latch-up, even if within absolute maximum limits. Automotive battery systems must be regulated to ≤18 V for reliable long-term use.
Can the TDA7391PD drive a 2 Ω speaker load?
No - the TDA7391PD is rated for minimum 3.2 Ω loads per the EIAJ standard and 4 Ω under typical test conditions. Driving 2 Ω exceeds its safe operating area, causing excessive current (beyond 4.5 A repetitive peak) and triggering short-circuit protection or thermal shutdown. Use only with 3.2 Ω or higher nominal loads.
How does the CD (clipping detection) pin function, and what external circuitry is needed?
The CD pin is an open-collector output that pulls low when output distortion reaches 10% THD. It requires an external pull-up resistor (typically 10 kΩ to +VS) to generate a logic-level signal. No additional conditioning is needed - the pin directly indicates clipping onset for gain limiting or visual status feedback without external comparators or ADCs.
Is the PowerSO20 (slug-up) package compatible with standard PowerSO20 footprints?
No - PowerSO20 (slug-up) has the thermal slug positioned on the top surface, not the bottom, requiring inverted heatsink mounting and distinct PCB pad layout. It is mechanically incompatible with bottom-slug PowerSO20 variants. Refer to Figure 15 in ST's Doc ID 6326 Rev 5 for exact dimensions and land pattern requirements.
TDA7391PD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-SOIC (0.433", 11.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Class AB
- Output Type:
- 1-Channel (Mono)
- Max Output Power x Channels @ Load:
- 40W x 1 @ 3.2Ohm
- Voltage - Supply:
- 8V ~ 18V
- Features:
- Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection, Standby
- Mounting Type:
- Surface Mount
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- PowerSO-20
TDA7391PD FAQ
1.How can I place an order for TDA7391PD through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7391PD 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 TDA7391PD reliable?
The price and inventory of TDA7391PD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7391PD is usually 5 days.
3.What payment methods are accepted for TDA7391PD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7391PD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7391PD?
TDA7391PD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7391PD 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 TDA7391PD?
For technical support, including TDA7391PD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7391PD requirements.
6.How does Aetrix verify that TDA7391PD is sourced from the original manufacturer or authorized distributors?
All TDA7391PD 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 TDA7391PD meets industry standards.
7.What is the process for return or replacement of TDA7391PD?
All TDA7391PD units undergo pre-shipment inspection (PSI). If there is an issue with TDA7391PD, 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 TDA7391PD part is unused and in its original packaging.
Return procedure for TDA7391PD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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