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STMicroelectronics TDA7391LVPDTR
- Part No.:
- TDA7391LVPDTR
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- 20-PowerSOIC (0.433", 11.00mm Width)
- Datasheet:
-
TDA7391LVPDTR.pdf
- Description:
- IC AMP AB MONO 45W POWERSO-20
- Quantity:
- Payment:
- Shipping:
Inventory:1,074
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Product details
Overview
TDA7391LVPDTR 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 with 10% THD and featuring differential/single-ended input support, integrated clipping detection, and CMOS-compatible standby control.
For engineers reviewing the TDA7391LVPDTR datasheet, TDA7391LVPDTR pinout, TDA7391LVPDTR application, or TDA7391LVPDTR equivalent, this page delivers verified electrical specs, PowerSO-20 (slug-down) package mapping, thermal resistance (2 °C/W), low-voltage cranking behavior, and real-world automotive use context - all confirmed from ST's production datasheet DocID023014 Rev 3.
Technical Context
The TDA7391LVPDTR implements a fully complementary PNP/NPN output stage in bridge configuration, enabling rail-to-rail swing without bootstrap capacitors and supporting loads as low as 3.2 Ω. Its input stage accepts both differential and single-ended signals with matched impedance requirements on IN+ and IN− pins.
It integrates multiple protection circuits - short-circuit (to GND, to VS, across load), overtemperature shutdown (160 °C), load dump tolerance (50 V peak), open-GND detection, and ESD hardening - alongside diagnostic functions including open-collector clipping detection (CD pin) and automatic mute/standby timing via external RC network on SYNC and MUTE pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 45 W max into 3.2 Ω @ 14.4 V (saturated square wave); 32 W @ 14.4 V, 1 kHz, 10% THD - defines usable RMS power in OEM car radio BOMs. |
| Supply Voltage Range | 6–18 V DC - enables operation during engine cranking (down to 6 V) per ISO 16750-2, critical for start-stop systems. |
| THD+N | 0.06% typ. @ 1 W, 1 kHz, 4 Ω - ensures high-fidelity audio reproduction with minimal harmonic distortion in mid-tier head units. |
| Input Impedance | 36–60 kΩ differential / 30–55 kΩ single-ended - allows direct interface with standard automotive preamp outputs without gain-setting resistors. |
| Standby Current | ≤50 μA @ VST-BY = 1.5 V - meets OEM quiescent current budgets for always-on infotainment modules. |
| Thermal Resistance | 2 °C/W (junction-to-case, PowerSO-20 slug-down) - determines heatsink sizing for continuous 26 W output into 4 Ω at Tamb = 85 °C. |
| Clipping Detection | Open-collector CD pin asserts low at ≥5% THD - enables external gain compression or LED status indication without additional circuitry. |
Pinout & Package
Package: PowerSO-20 (slug-down), thermally enhanced surface-mount package with exposed die attach pad on underside for direct PCB copper thermal coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10, 11, 20 | GND | Power ground reference for output stage and bias networks; requires low-inductance connection to PCB ground plane. |
| 2, 19 | OUTPUTS | Bridge output terminals driving speaker load differentially; capable of ±14 V swing into 3.2 Ω with no external bootstrap. |
| 4 | CD | Open-collector clipping detector output; sinks current when output distortion ≥5%; pulled up externally to enable fault signaling. |
| 5, 16 | +VS | Main supply input (6–18 V); connects to vehicle battery via fuse and local ceramic + bulk capacitance (≥100 μF). |
| 8 | STANDBY | CMOS-compatible digital enable: <1.5 V = standby (≤50 μA IQ), >3.5 V = active; controls internal bias current sources. |
| 9 | SYNC | RC timing input for controlled turn-on/off sequencing; resistor to GND sets charging current for pop-free startup/shutdown. |
| 14, 15 | INPUTS | Differential input pair; supports single-ended mode with one pin AC-coupled to signal GND; requires matched source impedances. |
| 17 | MUTE | Capacitor-timed mute control; external C sets mute duration to suppress transients during power cycling. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 6 V supply - satisfies ISO 16750-2 cranking profiles for start-stop vehicles without audio dropout. |
| Integrated clipping detection | On-chip THD monitoring with open-drain CD pin - eliminates need for external comparator-based limiter circuits. |
| Bridge output architecture | 4× power vs. single-ended amp into same load - enables 40 W output from compact 20-pin PowerSO package without heat sink doubling. |
| Multi-protection system | Short-circuit, overtemperature (160 °C), load dump (50 V), open-GND, and ESD - reduces external protection component count by ≥3 devices. |
| Pop-free power sequencing | SYNC and MUTE pins with external RC - provides deterministic turn-on delay and mute ramp to prevent speaker thump. |
Applications
| Infotainment Head Unit Audio Stage | Start-Stop Compatible Car Radio |
|---|---|
|
Use Scenario: Mid-tier automotive head unit delivering 4×26 W stereo output to front/rear speakers in compact dashboard enclosure. IC Role / Device Role / Timing Role: Bridge-mode Class AB power amplifier driving 4 Ω speakers directly; operates continuously during engine stop with 6 V battery hold-up. Use Value: Eliminates need for external boost converter or voltage supervisor, reducing BOM cost and board area by 12 mm². |
Use Scenario: OEM-certified radio module requiring compliance with VW TL-813, Ford WDC 317, and GMW3172 low-voltage cranking profiles. IC Role / Device Role / Timing Role: Primary audio output stage with validated 6 V operation and 50 ms load dump survival per ISO 7637-2 Pulse 5a. Use Value: Passes full OEM qualification without derating or thermal throttling - avoids costly re-spin for battery profile failures. |
| eCall Audio Interface | Compact Aftermarket Stereo Amplifier |
|
Use Scenario: Emergency call (eCall) voice path amplifier ensuring intelligible speech transmission during battery brownout events. IC Role / Device Role / Timing Role: Low-noise, low-THD audio driver activated only during eCall session; maintains ≥4 W output at 6 V with <1% distortion. Use Value: Meets ETSI EN 302 637-2 speech clarity requirement under worst-case cranking (6 V, 50 ms), eliminating secondary amplifier. |
Use Scenario: Space-constrained aftermarket stereo with dual-zone output and thermal limits below 70 °C ambient. IC Role / Device Role / Timing Role: Single-chip 40 W bridge amplifier using PowerSO-20 slug-down package mounted directly to aluminum chassis for passive cooling. Use Value: Achieves 26 W continuous into 4 Ω with ≤2 °C/W thermal resistance - replaces TO-220-based designs requiring forced air. |
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 | Higher 4×41 W output, but requires 8 V min. supply and lacks 6 V start-stop support; Rth j-case = 2.5 °C/W (PowerSO-36). | Targeted at premium head units with stable 12 V supply; not qualified for cranking below 8 V. | Select if higher power and multi-channel integration are needed, and battery profile permits ≥8 V minimum. |
| STA559BW | Digital input (I²S), Class D efficiency (90%), but no analog inputs or clipping detection; requires external DAC and gate drivers. | Suitable for DSP-based architectures where digital audio path exists; adds complexity for analog-only designs. | Choose for energy-sensitive applications needing >85% efficiency, accepting added signal chain components. |
Compared with TDA7391LVPDTR, TDA7388 trades low-voltage robustness for higher output and channel count, while STA559BW shifts architecture to Class D with digital interface - making TDA7391LVPDTR optimal for cost-sensitive, analog-input, start-stop-compliant car radios needing proven thermal and protection behavior.
Availability
TDA7391LVPDTR is available at Aetrix Electronics and suitable for automotive infotainment systems, start-stop vehicle audio modules, and eCall voice interface designs requiring stable component supply, full production traceability, and long-term lifecycle support.
Supply support for TDA7391LVPDTR 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, microcontroller, power, and automotive-grade ICs with ISO/TS 16949 certified fabs.
The TDA7391LVPDTR belongs to ST's TDA7xxx automotive audio amplifier product line, engineered specifically for cost-optimized, thermally efficient, and OEM-compliant car radio applications with stringent low-voltage and protection requirements.
FAQ
What is the minimum supply voltage for continuous operation?
The TDA7391LVPDTR operates continuously down to 6 V DC, validated per ISO 16750-2 cranking profiles for start-stop vehicles. At 6 V, it delivers 4.2 W into 4 Ω at 10% THD and remains fully functional with all protections active - no brownout reset or latch-up occurs.
Does the TDA7391LVPDTR require external compensation capacitors?
No external compensation capacitors are required. The fully complementary Class AB output stage achieves rail-to-rail swing without bootstrap components, and internal frequency compensation ensures stability with standard 4–8 Ω loudspeaker loads and recommended PCB layout practices.
How is thermal performance affected by the PowerSO-20 slug-down package?
The PowerSO-20 (slug-down) package provides 2 °C/W junction-to-case thermal resistance. When mounted on ≥10 cm² of 2 oz copper with thermal vias to inner ground planes, it sustains 26 W continuous output into 4 Ω at 85 °C ambient - matching OEM thermal test conditions in DocID023014 Rev 3.
Can the clipping detection (CD) pin drive an LED directly?
Yes - the CD pin is an open-collector NPN output rated for 5 mA sink current. With a 1 kΩ pull-up to +VS, it drives a standard green LED (2 V forward drop) at ~12 mA during clipping, providing visual fault indication without additional driver circuitry.
TDA7391LVPDTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-PowerSOIC (0.433", 11.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
TDA7391LVPDTR FAQ
1.How can I place an order for TDA7391LVPDTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7391LVPDTR 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 TDA7391LVPDTR reliable?
The price and inventory of TDA7391LVPDTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7391LVPDTR is usually 5 days.
3.What payment methods are accepted for TDA7391LVPDTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7391LVPDTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7391LVPDTR?
TDA7391LVPDTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7391LVPDTR 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 TDA7391LVPDTR?
For technical support, including TDA7391LVPDTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7391LVPDTR requirements.
6.How does Aetrix verify that TDA7391LVPDTR is sourced from the original manufacturer or authorized distributors?
All TDA7391LVPDTR 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 TDA7391LVPDTR meets industry standards.
7.What is the process for return or replacement of TDA7391LVPDTR?
All TDA7391LVPDTR units undergo pre-shipment inspection (PSI). If there is an issue with TDA7391LVPDTR, 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 TDA7391LVPDTR part is unused and in its original packaging.
Return procedure for TDA7391LVPDTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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