My Inquiry
My Account
STMicroelectronics TDA7391LVPDU
- Part No.:
- TDA7391LVPDU
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- 20-PowerSOIC (0.433", 11.00mm Width)
- Datasheet:
-
TDA7391LVPDU.pdf
- Description:
- IC AMP AB MONO 45W POWERSO-20
- Quantity:
- Payment:
- Shipping:
Inventory:4,855
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TDA7391LVPDU from STMicroelectronics is a 40 W bridge-type Class AB audio power amplifier IC designed for automotive car radio systems, operating down to 6 V for start-stop and e-call compliance, delivering 32 W into 3.2 Ω at 14.4 V (THD = 10 %), featuring differential/single-ended inputs, integrated clipping detection, and full short-circuit and thermal protection.
For engineers reviewing the TDA7391LVPDU datasheet, TDA7391LVPDU pinout, TDA7391LVPDU application, or TDA7391LVPDU equivalent, this page provides verified electrical specs, PowerSO-20 (slug-up) package details, real-world low-voltage operation data, and OEM-compliant protection features essential for automotive infotainment design.
Technical Context
The TDA7391LVPDU implements a fully complementary PNP/NPN bridge output stage enabling rail-to-rail swing without bootstrap capacitors and supports both differential and single-ended input configurations with matched impedance requirements. Its internal fixed gain (30 dB typ.) and on-chip clipping detector (5–15 % THD threshold) enable direct integration into gain-compression audio systems.
It operates across 6–18 V supply range, sustaining full functionality during engine cranking events (e.g., 6 V for 50 ms), and integrates CMOS-compatible standby/mute control with 90 dB attenuation, thermal shutdown at 160 °C, and protection against load dump, open GND, and inductive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 32 W @ 3.2 Ω, 14.4 V, 1 kHz, THD = 10 % - enables high-fidelity mid-bass drive in compact automotive head units |
| Supply Range | 6–18 V - supports 'start-stop' battery profiles and e-call emergency power continuity |
| THD+N | 0.03 % typ. @ 1–15 W, 4 Ω - ensures low distortion across usable audio power range |
| Input Impedance | 36–60 kΩ (differential), 30–55 kΩ (single-ended) - matches standard preamp outputs without loading |
| Clipping Detection | Open-collector CD pin asserts low at 5–15 % THD - enables external LED indicators or DSP-based gain limiting |
| Standby Current | ≤ 50 μA @ VST-BY = 1.5 V - meets ultra-low quiescent power requirements for always-on vehicle systems |
| Thermal Shutdown | 160 °C junction temperature - protects die during sustained high-power or poor heatsinking conditions |
Pinout & Package
Package: PowerSO-20 (slug-up) - thermally enhanced surface-mount package with exposed metal slug on top side for direct heatsink contact, 20-pin layout, RoHS-compliant ECOPACK®.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10, 11, 20 | GND | Power ground reference for all internal bias and output stages; requires low-inductance PCB connection |
| 2, 19 | OUTPUTS | Bridge outputs driving speaker load differentially; capable of 4.5 A peak current into 3.2 Ω |
| 4 | CD | Open-collector clipping detection output; sinks current when THD ≥ 5 % - used for mute coordination or diagnostics |
| 8 | STANDBY | CMOS-compatible active-high enable; IC fully operational above 3.5 V, draws ≤ 50 μA below 1.5 V |
| 9 | MUTE | Capacitor-timed mute control; prevents pop noise during power-up/down via internal soft-start circuitry |
| 14, 15 | INPUTS | Differential input pair; accepts single-ended signal if one input is AC-coupled to signal GND with matched impedances |
| 17 | +VS | Main supply input (6–18 V); decoupling capacitor required near pin for stability under dynamic load |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional at 6 V supply - maintains audio output during engine stop/start cycles per OEM specifications |
| Integrated clipping detector | On-die THD monitoring with open-drain output - eliminates need for external comparator or ADC in gain-control loops |
| Bridge Class AB topology | No bootstrap capacitors required - simplifies PCB layout and improves reliability vs. Class D in cost-sensitive analog radios |
| Comprehensive protection suite | Short-circuit (to GND/VS/across load), overtemperature, load dump, open GND, ESD - reduces need for external protection components |
| Fixed 30 dB voltage gain | Eliminates external feedback resistors - minimizes BOM count and layout sensitivity in production head units |
Applications
| Automotive Infotainment Head Unit | Start-Stop Compatible Radio Module |
|---|---|
|
Use Scenario: Integrated audio amplifier in OEM dashboard-mounted car stereo supporting AM/FM/DAB and Bluetooth streaming. IC Role / Device Role / Timing Role: Primary bridge power stage driving 4 Ω speakers with differential input interface to DSP audio processor. Use Value: Delivers 26 W clean output at 14.4 V while maintaining operation during 6 V cranking dips - avoids audio dropout during traffic light stops. |
Use Scenario: Compact aftermarket radio replacement module requiring seamless engine stop/start compatibility. IC Role / Device Role / Timing Role: Standalone audio power amplifier with CMOS standby control synchronized to vehicle ignition state. Use Value: Draws only 50 μA in standby and resumes full output within milliseconds after wake - meets ISO 16750-2 cranking profile requirements. |
| e-Call Emergency Audio System | High-Fidelity Rear-Seat Entertainment |
|
Use Scenario: Voice path amplifier in vehicle emergency call (e-Call) system mandated by EU regulation. IC Role / Device Role / Timing Role: Low-latency audio driver for microphone/speaker interface during battery brownout conditions. Use Value: Operates continuously at 6 V with <0.05 % THD @ 1 W - ensures intelligible voice transmission even during severe battery sag. |
Use Scenario: Dual-channel rear-seat entertainment unit powering 3.2 Ω coaxial speakers in premium vehicles. IC Role / Device Role / Timing Role: High-current bridge amplifier enabling 45 W peak into low-impedance loads for dynamic bass response. Use Value: Supports 45 W max into 3.2 Ω at 14.4 V with integrated short-circuit protection - eliminates risk of damage from speaker wire faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio power amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7392 | Higher 50 W output (4 Ω), but requires ≥ 8 V min supply - no 6 V start-stop support | Not suitable for cranking-aware designs; better for non-start-stop premium audio modules | Select only if system supply never drops below 8 V and higher power is mandatory |
| TPA3116D2 | Class D topology, 50 W into 4 Ω, 90 % efficiency - but lacks integrated clipping detection and requires external LC filter | Used where thermal budget is tight; incompatible with analog-only signal chains needing Class AB linearity | Choose for battery-powered portables or heat-constrained enclosures - not drop-in for TDA7391LVPDU's analog architecture |
Compared with TDA7391LVPDU, TDA7392 trades low-voltage robustness for higher output power, while TPA3116D2 offers efficiency gains at the cost of added external components and loss of analog-friendly features like built-in clipping detection and single-supply simplicity.
Availability
TDA7391LVPDU is available at Aetrix Electronics and suitable for automotive infotainment head units, start-stop radio modules, and e-call emergency audio systems requiring stable component supply with long-term automotive-grade lifecycle support.
Supply support for TDA7391LVPDU 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 AEC-Q100 qualified product portfolios.
The TDA7391LVPDU belongs to ST's automotive audio amplifier product line, engineered specifically for OEM and Tier-1 infotainment systems demanding robust low-voltage operation, integrated protection, and simplified system-level design.
FAQ
What is the minimum supply voltage for continuous operation?
The TDA7391LVPDU operates continuously down to 6 V DC, validated per OEM 'start-stop' specifications including worst-case battery cranking curves (e.g., 6 V for 50 ms). Below 6 V, functionality is not guaranteed; the device may enter undervoltage lockout or exhibit degraded output power and increased distortion.
Does the TDA7391LVPDU require external compensation components?
No external compensation components are required. The amplifier uses an internally compensated design optimized for stability with standard 4–8 Ω loudspeaker loads and typical PCB layout practices. Only local supply decoupling (e.g., 100 nF ceramic + 10 µF electrolytic) near the +VS pin is mandatory.
How does the clipping detection (CD) pin function in practice?
The CD pin is an open-collector output that pulls low when total harmonic distortion exceeds 5–15 % (typical threshold). It can directly drive an LED indicator or interface with a microcontroller GPIO to trigger automatic gain reduction, ensuring consistent perceived loudness without audible clipping artifacts.
Can the TDA7391LVPDU be used in single-ended input mode?
Yes - the input stage accepts single-ended signals by capacitively coupling one input (e.g., IN+ to signal source) while connecting the other (IN−) to signal ground through a resistor matching the source impedance. Both inputs must see equal impedance to maintain common-mode rejection and minimize distortion.
TDA7391LVPDU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-PowerSOIC (0.433", 11.00mm Width)
- 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:
- 6V ~ 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
TDA7391LVPDU FAQ
1.How can I place an order for TDA7391LVPDU through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7391LVPDU 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 TDA7391LVPDU reliable?
The price and inventory of TDA7391LVPDU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7391LVPDU is usually 5 days.
3.What payment methods are accepted for TDA7391LVPDU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7391LVPDU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7391LVPDU?
TDA7391LVPDU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7391LVPDU 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 TDA7391LVPDU?
For technical support, including TDA7391LVPDU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7391LVPDU requirements.
6.How does Aetrix verify that TDA7391LVPDU is sourced from the original manufacturer or authorized distributors?
All TDA7391LVPDU 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 TDA7391LVPDU meets industry standards.
7.What is the process for return or replacement of TDA7391LVPDU?
All TDA7391LVPDU units undergo pre-shipment inspection (PSI). If there is an issue with TDA7391LVPDU, 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 TDA7391LVPDU part is unused and in its original packaging.
Return procedure for TDA7391LVPDU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TDA7391LVPDU Tags
-Exposed-Pad.jpg)
-
TS34119CS RLG
Taiwan Semiconductor Corporation
-
LM386MX-1/NOPB
Texas Instruments
-
TPA711DGNR
Texas Instruments
-
LM386N-4/NOPB
Texas Instruments
-
TS4990IST
STMicroelectronics
-
PAM8302AASCR
Diodes Incorporated
-
TPA6130A2RTJR
Texas Instruments
-
TPA6111A2DGNR
Texas Instruments
-
LM4861MX/NOPB
Texas Instruments
-
LM386M-1/NOPB
Texas Instruments
-
NCS2211DR2G
onsemi
-
IS31AP2005-DLS2-TR
Lumissil Microsystems
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
