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STMicroelectronics TDA7391LVPD
- Part No.:
- TDA7391LVPD
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- 20-PowerSOIC (0.433", 11.00mm Width)
- Datasheet:
-
TDA7391LVPD.pdf
- Description:
- IC AMP AB MONO 45W POWERSO-20
- Quantity:
- Payment:
- Shipping:
Inventory:4,672
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Product details
Overview
TDA7391LVPD from STMicroelectronics is a 40 W bridge-tied load (BTL) Class AB audio power amplifier IC designed for automotive car radio systems. It delivers 26 W into 4 Ω at 14.4 V/1 kHz/10% THD, operates down to 6 V for start-stop compatibility, features differential/single-ended inputs, CMOS-compatible standby, and integrated clipping detection. It serves as the final-stage audio driver in OEM head units requiring robust low-voltage operation.
For engineers reviewing the TDA7391LVPD datasheet, TDA7391LVPD pinout, TDA7391LVPD application, or TDA7391LVPD equivalent, key selection criteria include its 6–18 V supply range, 45 W max output into 3.2 Ω, thermal shutdown at 160 °C, PowerSO-20 (slug-down) package, and OEM-compliant start-stop/e-call support.
Technical Context
The TDA7391LVPD implements a fully complementary PNP/NPN BTL output stage with rail-to-rail swing and no bootstrap capacitors required. Its input stage accepts either differential or single-ended signals with matched impedance paths and 60 kΩ typical differential input impedance.
It integrates multiple protection circuits: short-circuit (to GND, to VS, across load), overtemperature shutdown at 160 °C, load dump tolerance up to 50 V peak, open-GND detection, and ESD protection. The on-chip clipping detector (CD pin) asserts low during ≥5% THD, enabling external gain compression.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 26 W @ 4 Ω, 14.4 V, 1 kHz, 10% THD - usable full-range audio output for mid-tier car speakers |
| Supply Voltage Range | 6–18 V - enables uninterrupted operation during engine cranking (e.g., 6 V for 50 ms) |
| THD+N | 0.03% @ 1 W, 4 Ω - low distortion preserves audio fidelity in high-end head units |
| Voltage Gain | 30 dB ±0.5 dB - fixed internal gain simplifies PCB layout and eliminates external feedback network |
| Input Impedance | 60 kΩ differential - minimizes loading on preamp stage and supports direct connection to DSP outputs |
| Standby Current | 50 μA max - meets automotive quiescent current requirements for always-on infotainment systems |
| Thermal Shutdown | 160 °C junction - protects against sustained overload or poor heatsinking in enclosed dash environments |
Pinout & Package
Package: PowerSO-20 (slug-down) - thermally enhanced surface-mount package with exposed metal slug on bottom side for direct PCB heatsinking; RoHS-compliant ECOPACK®.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10, 11, 20 | GND | Power ground return path; requires low-inductance connection to PCB ground plane for stability |
| 2, 19 | OUTPUTS | BTL output pair driving speaker directly; capable of 4.5 A peak current into 3.2 Ω loads |
| 4 | CD | Open-collector clipping detect output; pulls low when THD ≥5%, used for dynamic range compression |
| 5, 16 | +VS | Main power supply input (6–18 V); decoupling capacitor required near pin for transient immunity |
| 8 | STANDBY | CMOS-compatible active-high enable; <1.5 V = standby (50 μA), >3.5 V = operational |
| 9 | MUTE | Capacitor-timed mute control; prevents pop noise during power-up/down transitions |
| 14, 15 | INPUTS | Differential input pins; accept single-ended signal via AC coupling to IN+ and GND to IN− |
| 17 | SYNC | Timing pin for mute/standby sequencing; resistor to GND sets turn-on/off ramp rate |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Functional down to 6 V supply - certified for OEM start-stop battery profiles and e-call emergency audio |
| Integrated clipping detection | Dedicated open-drain CD pin with 5–15% THD threshold - enables real-time loudness control without external circuitry |
| Full protection suite | Short-circuit (to GND/VS/load), overtemperature (160 °C), load dump (50 V/50 ms), open-GND - reduces system-level failure risk |
| Minimal external components | No bootstrap caps, no external gain-setting resistors, no compensation network - cuts BOM count and layout area |
| BTL architecture | 40 W max into 4 Ω (bridge mode) - doubles voltage swing vs. SE, delivering 4× power into same load impedance |
Applications
| OEM Car Radio Head Unit | Start-Stop Compatible Infotainment |
|---|---|
Use Scenario: Integrated audio amplifier in factory-installed dashboard head unit powering front/rear speakers. IC Role / Device Role / Timing Role: Final-stage BTL audio power driver; receives line-level signal from DSP and drives 4 Ω speakers directly. Use Value: Delivers 26 W clean output at 14.4 V while maintaining THD <0.03% - meets OEM audio quality benchmarks for mid-tier vehicles. |
Use Scenario: Audio subsystem in vehicles with automatic engine stop-start functionality. IC Role / Device Role / Timing Role: Low-voltage resilient amplifier ensuring uninterrupted audio during 6–7 V battery cranking events lasting ≤50 ms. Use Value: Sustains 4.2 W output at 6 V/10% THD - preserves voice guidance and warning tones during engine restart. |
| e-Call Emergency Audio System | Aftermarket Digital Car Stereo |
Use Scenario: Voice path amplifier in EU-mandated e-call telematics module. IC Role / Device Role / Timing Role: High-reliability audio driver activated during crash event; must operate under worst-case battery transients. Use Value: Certified for load dump (50 V/50 ms) and open-GND fault tolerance - ensures call connectivity even after severe electrical faults. |
Use Scenario: Compact high-power amplifier in space-constrained aftermarket digital stereo platforms. IC Role / Device Role / Timing Role: Drop-in BTL audio solution replacing legacy multi-chip designs; uses PowerSO-20 for efficient thermal management. Use Value: Reduces component count by eliminating external gain resistors and bootstrap caps - lowers assembly cost and improves MTBF. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BTL audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7392 | Higher 50 W output into 4 Ω but requires 8 V min supply; no 6 V start-stop support | Targeted at non-start-stop premium head units needing higher power density | Select only if system supply never drops below 8 V and >30 W output is mandatory |
| TPA3116D2 | Class D topology; 50 W into 4 Ω; higher efficiency (90%) but requires external LC filter | Suitable for thermally constrained designs where heat dissipation is critical | Prefer when board space allows LC filter and efficiency >85% is prioritized over analog simplicity |
Compared with TDA7391LVPD, TDA7392 offers +24 W output but sacrifices start-stop compliance, while TPA3116D2 improves thermal performance at the cost of added filter complexity and EMI management - making TDA7391LVPD optimal for cost-sensitive, low-voltage OEM audio systems.
Availability
TDA7391LVPD is available at Aetrix Electronics and suitable for automotive infotainment systems, start-stop compatible head units, and e-call emergency audio modules requiring stable component supply throughout extended vehicle production lifecycles.
Supply support for TDA7391LVPD 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 scale and AEC-Q100 qualification expertise.
The TDA7391LVPD belongs to ST's automotive audio amplifier product line, engineered specifically for OEM car radio applications demanding robust low-voltage operation, integrated protection, and simplified system design.
FAQ
What is the minimum supply voltage for continuous operation?
The TDA7391LVPD operates continuously down to 6 V DC, validated per OEM start-stop specifications. At this voltage, it delivers 4.2 W into 4 Ω at 10% THD and remains fully functional during engine cranking events lasting up to 50 ms - confirmed in Section 3.4 of the official datasheet.
Does the TDA7391LVPD require external bootstrap capacitors?
No. The TDA7391LVPD uses a fully complementary PNP/NPN BTL output stage that achieves rail-to-rail voltage swing without bootstrap capacitors. This eliminates two external components and associated layout constraints, as stated in the Description section and verified in Figure 1's block diagram.
How is clipping detected and used in system design?
Clipping is detected internally when THD reaches 5–15% (typ. 10%), causing the open-collector CD pin to pull low. This signal can drive an external comparator or microcontroller input to trigger gain reduction, preventing speaker damage and improving perceived loudness - detailed in Table 2 (Pin Function) and Section 3.3 (Electrical Characteristics).
What thermal resistance does the PowerSO-20 (slug-down) package provide?
The PowerSO-20 (slug-down) package delivers a junction-to-case thermal resistance (Rth j-case) of 2.0 °C/W maximum, as specified in Table 4. This enables 43 W total power dissipation at 85 °C case temperature - critical for mounting on copper-filled thermal pads in automotive dash enclosures.
TDA7391LVPD 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
TDA7391LVPD FAQ
1.How can I place an order for TDA7391LVPD through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7391LVPD 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 TDA7391LVPD reliable?
The price and inventory of TDA7391LVPD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7391LVPD is usually 5 days.
3.What payment methods are accepted for TDA7391LVPD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7391LVPD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7391LVPD?
TDA7391LVPD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7391LVPD 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 TDA7391LVPD?
For technical support, including TDA7391LVPD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7391LVPD requirements.
6.How does Aetrix verify that TDA7391LVPD is sourced from the original manufacturer or authorized distributors?
All TDA7391LVPD 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 TDA7391LVPD meets industry standards.
7.What is the process for return or replacement of TDA7391LVPD?
All TDA7391LVPD units undergo pre-shipment inspection (PSI). If there is an issue with TDA7391LVPD, 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 TDA7391LVPD part is unused and in its original packaging.
Return procedure for TDA7391LVPD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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