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STMicroelectronics TDA7391
- Part No.:
- TDA7391
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- Multiwatt-11 (Vertical, Bent and Staggered Leads)
- Datasheet:
-
TDA7391.pdf
- Description:
- IC AMP AB MONO 45W 11MULTIWATT
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
TDA7391 from STMicroelectronics is a bridge-connected Class AB audio power amplifier designed for high-power car radio applications, delivering up to 45 W into 3.2 Ω (VS = 14.4 V), featuring differential or single-ended input support, fixed 30 dB gain, and integrated short-circuit/thermal/load-dump protection.
For engineers reviewing the TDA7391 datasheet, TDA7391 pinout, TDA7391 application, or TDA7391 equivalent, this device is selected for automotive audio boosters requiring low external component count, pop-free mute/standby, and robust operation under inductive load and supply transients.
Technical Context
The TDA7391 integrates a fully complementary PNP/NPN output stage enabling rail-to-rail swing without bootstrap capacitors, and features an on-chip clipping detector (CD pin) that asserts low during ≥5% THD output distortion. Its internal fixed-gain architecture eliminates external feedback networks.
Standby and mute functions are independently programmable via RC timing on SYNC and MUTE pins, with CMOS-compatible logic thresholds (VSBon = 1.5 V, VSBoff = 3.5 V) and sub-100 µA standby current. Protection includes short-circuit (to GND, VS, across load), overtemperature shutdown at 160 °C, and open-GND detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 35 W @ 4 Ω EIAJ (VS = 13.7 V); enables compliance with automotive audio test standards |
| Supply Voltage Range | 8–18 V DC; supports full automotive battery range including cold-crank (8 V) and load-dump (18 V) |
| Gain | 30 dB ±0.5 dB; internally fixed, eliminating gain-setting resistors and layout sensitivity |
| THD+N | 0.03% @ 1 W, 0.06% max @ full power; meets high-fidelity car audio requirements |
| Input Impedance | 60 kΩ differential / 55 kΩ single-ended; ensures compatibility with preamp outputs without loading |
| CMRR | 65 dB @ 1 kHz; rejects common-mode noise from shared vehicle ground paths |
| SVR | 60 dB @ 1 kHz; maintains audio integrity despite battery ripple and alternator noise |
Pinout & Package
Package: Multiwatt11 (vertical), thermally enhanced SIP-11 with exposed metal tab for heatsink mounting (Rth j-case = 1.8 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | INPUTS | Differential input pair; accepts single-ended signal when one pin is AC-coupled to GND - impedance matching required |
| 3, 9 | +V | Main power supply inputs; dual connection reduces trace inductance and improves PSRR |
| 4 | CD | Open-collector clipping detect output; sinks current when output THD ≥5%, used for AGC or LED indication |
| 5, 7 | OUTPUTS | Bridge outputs driving speaker directly; capable of 3.2 Ω loads with full rail-to-rail swing |
| 6 | GND | Analog ground reference; must be low-impedance star point for noise control |
| 8 | STAND-BY | CMOS-compatible enable input; <1.5 V = standby (<100 µA quiescent), >3.5 V = active |
| 10 | SYNC | RC-programmable turn-on delay pin; sets bias ramp time with external resistor to GND |
| 11 | MUTE | RC-programmable mute timing pin; capacitor to GND sets soft-mute duration to prevent pop |
Key Features
| Feature | Design Value |
|---|---|
| No bootstrap capacitors | Rail-to-rail output swing achieved via complementary PNP/NPN output stage - eliminates large electrolytic caps and PCB area |
| Internally fixed 30 dB gain | Removes external feedback network, reducing component count, layout sensitivity, and thermal drift effects |
| Clipping detection (CD pin) | Hardware-level THD ≥5% flag enables real-time gain compression or visual/audio alerts without DSP overhead |
| Pop-free mute & standby | Internal sequencing controlled by MUTE/SYNC RC timing prevents transient spikes during power-up/down |
| Full short-circuit protection | Withstands faults to GND, VS, and across load - critical for unattended automotive environments with wiring hazards |
Applications
| Car Radio Booster Amplifier | Aftermarket Head Unit Output Stage |
|---|---|
|
Use Scenario: High-power front-channel amplification in OEM or premium aftermarket car radios. IC Role / Device Role / Timing Role: Bridge-output audio power stage driving 4 Ω speakers with EIAJ-compliant 35 W output. Use Value: Delivers clean, high-SNR audio under wide supply variation (8–18 V) while surviving load dump and reverse battery events. |
Use Scenario: Replacement output stage in aging head units needing higher output power and lower THD. IC Role / Device Role / Timing Role: Drop-in Class AB power amplifier with pin-compatible Multiwatt11 footprint and identical gain configuration. Use Value: Enables 45 W peak into 3.2 Ω without redesigning feedback or compensation - extends product life with minimal BOM change. |
| Automotive Subwoofer Driver | Commercial Vehicle Infotainment System |
|
Use Scenario: Low-frequency driver in compact subwoofer modules for SUVs and vans. IC Role / Device Role / Timing Role: High-current bridge amplifier handling 3.2 Ω voice coils with thermal shutdown at 160 °C. Use Value: Sustains 32 W continuous output at 14.4 V with no external heat sinking beyond PCB copper pour - reduces module size and cost. |
Use Scenario: Audio output for fleet management terminals and bus infotainment systems. IC Role / Device Role / Timing Role: Ruggedized audio power stage operating across -40 °C to +105 °C ambient with ESD and load-dump immunity. Use Value: Meets EN 50155 vibration/temperature specs and ISO 7637-2 pulse 5a load-dump tolerance without external TVS. |
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 | Quad-channel (4×41 W), higher channel count but lower per-channel PSRR (55 dB vs. 60 dB) | Suitable for multi-zone systems; not pin-compatible - requires PCB redesign | Select when system needs four independent channels and can accommodate larger package (Multiwatt15) |
| STA559BW | Digital input (I²S), Class D efficiency (>80%), but requires external gate drivers and LC filter | Preferred for battery-powered portable audio; unsuitable for analog preamp integration | Choose only if system uses digital audio source and prioritizes efficiency over analog simplicity |
Compared with TDA7391, TDA7388 offers channel density at the expense of analog input flexibility and PSRR, while STA559BW trades analog interface simplicity for efficiency and digital dependency - making TDA7391 optimal for analog-based, high-reliability automotive amplifiers.
Availability
TDA7391 is available at Aetrix Electronics and suitable for car radio booster amplifiers, aftermarket head unit upgrades, and commercial vehicle infotainment systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for TDA7391 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, designing and manufacturing analog, MCU, power, and automotive-grade ICs since 1987.
The TDA7391 belongs to ST's automotive audio power amplifier product line, engineered specifically for high-reliability, high-power analog audio in vehicles - emphasizing ruggedness, low external part count, and seamless integration with legacy analog signal chains.
FAQ
What is the minimum supply voltage required for full-rated output power?
The TDA7391 operates down to 8 V supply voltage, but full 35 W EIAJ output requires VS ≥13.7 V. At 8 V, output power drops to ~12 W into 4 Ω due to reduced rail headroom - design margin must account for cold-crank conditions where battery dips below 9 V.
Can the TDA7391 drive 2 Ω speakers?
No - the datasheet specifies safe operation down to 3.2 Ω. Driving 2 Ω loads exceeds absolute maximum output current (6 A non-repetitive) and risks triggering thermal shutdown or bond-wire failure, even with heatsinking. Use only with 3.2 Ω or higher impedances.
How is clipping detection implemented and what does the CD pin output signify?
The CD pin is an open-collector output that pulls low when output THD reaches ≥5%, measured continuously. It remains low until distortion falls below 5% for >100 ms. This signal can drive an LED or microcontroller interrupt to trigger automatic gain reduction.
Is external compensation required for stability with capacitive loads?
No - the TDA7391 is internally compensated for stability with standard speaker cables and typical capacitive loads up to 100 nF. No external compensation components are needed, per Figure 3 test circuit and Section 1.2 pin description confirming "no external compensation is necessary".
TDA7391 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- Multiwatt-11 (Vertical, Bent and Staggered Leads)
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Class AB
- Output Type:
- 1-Channel (Mono)
- Max Output Power x Channels @ Load:
- 45W x 1 @ 3.2Ohm
- Voltage - Supply:
- 8V ~ 18V
- Features:
- Depop, Differential Inputs, Mute, Short-Circuit and Thermal Protection, Standby
- Mounting Type:
- Through Hole
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 11-Multiwatt
TDA7391 FAQ
1.How can I place an order for TDA7391 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7391 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 TDA7391 reliable?
The price and inventory of TDA7391 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7391 is usually 5 days.
3.What payment methods are accepted for TDA7391?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7391 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7391?
TDA7391 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7391 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 TDA7391?
For technical support, including TDA7391 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7391 requirements.
6.How does Aetrix verify that TDA7391 is sourced from the original manufacturer or authorized distributors?
All TDA7391 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 TDA7391 meets industry standards.
7.What is the process for return or replacement of TDA7391?
All TDA7391 units undergo pre-shipment inspection (PSI). If there is an issue with TDA7391, 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 TDA7391 part is unused and in its original packaging.
Return procedure for TDA7391:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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