E-TDA7391PDTR - 2x40W Dual BTL Audio Amplifier | STMicroelectronics
MPN: E-TDA7391PDTR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.25 | $5.25 |
| 10 | $4.72 | $47.20 |
| 100 | $4.2 | $420.00 |
| 500 | $3.78 | $1,890.00 |
| 1,000 | $3.36 | $3,360.00 |
E-TDA7391PDTR Overview
An audio power amplifier is an electronic device that increases the amplitude of audio frequency signals to drive loudspeakers. In the hierarchy of audio electronics, a BTL amplifier is a type of linear amplifier that uses a bridge configuration to double the voltage swing across the load, effectively quadrupling the output power compared to a single-ended amplifier with the same supply voltage. This makes BTL amplifiers ideal for automotive applications where the battery voltage is limited to 12V or 14.4V, and high output power is required without using bulky transformers or switching converters.
Key features of the E-TDA7391PDTR include a wide operating supply voltage range of 8V to 18V, a low quiescent current of 120mA, and a high output power of 40W per channel at 10% THD. The device also features standby and mute functions for power management, a pop-free turn-on/off sequence, and full short-circuit and thermal protection. The PowerSO-20 package has an exposed pad that enhances heat dissipation, allowing continuous operation at high power levels without external heatsinks in many applications.
The E-TDA7391PDTR uses a complementary NPN/PNP output stage with a class-AB biasing scheme, which provides low crossover distortion and high linearity. The device incorporates a sophisticated protection circuitry that includes output short-circuit protection, over-temperature shutdown, and load dump protection, ensuring reliable operation in harsh automotive environments. The standby and mute pins allow for easy system-level power management, reducing power consumption when the audio system is not in use.
Typical applications include car radio head units, multimedia systems, and aftermarket audio amplifiers. The high output power and low distortion make it suitable for driving mid-range and subwoofer speakers in automotive sound systems. The device can also be used in home theater systems and portable PA systems where a compact, high-power amplifier is required.
When designing with the E-TDA7391PDTR, it is essential to provide adequate power supply decoupling with a 1000uF electrolytic capacitor and a 100nF ceramic capacitor close to the supply pins. The exposed pad must be soldered to a large copper area on the PCB to ensure proper thermal management. Additionally, the standby and mute pins should be controlled with a microcontroller or a simple RC network to ensure a pop-free power-up sequence.
Drop-in alternatives for E-TDA7391PDTR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with E-TDA7391PDTR (same form factor and footprint) — differing in Mounting Type, Package, Short-Circuit Protection, Output Configuration, Output Power.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TDA7391PD
✅ Drop-In📋 Reference alternative (not in catalog)
TDA7391PD13TR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
E-TDA7391PDTR Maximum Ratings & Electrical Characteristics
| Output Power | 2x40W at 4 ohm, 14.4V, 10% THD |
| Supply Voltage Range | 8V to 18V |
| Quiescent Current | 120mA |
| Amplifier Type | Class AB |
| Output Configuration | Bridge-Tied Load (BTL) |
| Number of Channels | 2 (Dual) |
| Package | PowerSO-20 |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +105C |
| Standby Function | Yes |
| Mute Function | Yes |
| Short-Circuit Protection | Yes |
| Thermal Protection | Yes |
| Load Dump Protection | Yes |
| RoHS Status | Compliant |
E-TDA7391PDTR Pin Configuration
| Pin 1 | OUT1+ — Positive output for channel 1 |
| Pin 2 | OUT1- — Negative output for channel 1 |
| Pin 3 | GND — Ground |
| Pin 4 | IN1+ — Non-inverting input for channel 1 |
| Pin 5 | IN1- — Inverting input for channel 1 |
| Pin 6 | SVR — Supply voltage ripple rejection |
| Pin 7 | MUTE — Mute control input |
| Pin 8 | STBY — Standby control input |
| Pin 9 | IN2- — Inverting input for channel 2 |
| Pin 10 | IN2+ — Non-inverting input for channel 2 |
| Pin 11 | GND — Ground |
| Pin 12 | OUT2- — Negative output for channel 2 |
| Pin 13 | OUT2+ — Positive output for channel 2 |
| Pin 14 | VS — Power supply voltage |
| Pin 15 | VS — Power supply voltage |
| Pin 16 | GND — Ground |
| Pin 17 | GND — Ground |
| Pin 18 | GND — Ground |
| Pin 19 | GND — Ground |
| Pin 20 | GND — Ground |
Typical Applications
E-TDA7391PDTR is suitable for 6 applications: Car Radio Head Units, Multimedia Systems, Aftermarket Audio Amplifiers, Home Theater Systems, Portable PA Systems, Automotive Subwoofer Amplifiers.
Car Radio Head Units
The E-TDA7391PDTR is ideal for car radio head units, providing high output power (2x40W) to drive speakers directly. Its BTL configuration maximizes power from the 12V battery supply, and the standby/mute functions enable efficient power management. The device's protection features ensure reliable operation in automotive environments with voltage transients and temperature extremes.
Recommended
Multimedia Systems
In multimedia systems, the E-TDA7391PDTR delivers clean, high-power audio for entertainment units. Its low distortion and high linearity ensure accurate sound reproduction. The device's compact PowerSO-20 package allows for space-efficient PCB designs, and the exposed pad aids in thermal management for continuous operation.
Recommended
Aftermarket Audio Amplifiers
The E-TDA7391PDTR is suitable for aftermarket audio amplifiers, providing high power output for aftermarket speakers and subwoofers. Its robust protection features, including short-circuit and thermal protection, ensure durability in demanding installations. The device's wide supply voltage range accommodates various vehicle electrical systems.
Recommended
Home Theater Systems
The E-TDA7391PDTR can be used in home theater systems to drive satellite speakers or subwoofers. Its high output power and low distortion make it suitable for high-fidelity audio reproduction. The device's compact package and thermal performance allow for integration into slim home theater receivers.
Recommended
Portable PA Systems
For portable PA systems, the E-TDA7391PDTR provides high power output in a compact form factor, making it ideal for battery-powered or portable amplifiers. Its low quiescent current helps extend battery life, and the standby function allows for power saving when not in use. The device's thermal protection ensures safe operation in enclosed spaces.
Recommended
Automotive Subwoofer Amplifiers
The E-TDA7391PDTR is well-suited for automotive subwoofer amplifiers, delivering high power to drive subwoofers with deep bass. Its BTL configuration provides high voltage swing, and the device's protection features safeguard against short circuits and overheating. The PowerSO-20 package with exposed pad ensures efficient heat dissipation for sustained bass output.
Recommended
Recommended Products Summary
Engineering reference data for E-TDA7391PDTR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TDA7391PD | TDA7391PD13TR | TDA7391 | TDA7851L |
|---|---|---|---|---|---|
| Package | PowerSO-20 | PowerSO-20 | PowerSO-20 | Multiwatt-15 | Flexiwatt-25 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Output Power | 2x40W at 4 ohm, 14.4V, 10% THD | 2x40W at 4 ohm, 14.4V, 10% THD | 2x40W at 4 ohm, 14.4V, 10% THD | 2x40W at 4 ohm, 14.4V, 10% THD | 4x75W at 4 ohm, 14.4V, 10% THD |
| Number of Channels | 2 | 2 | 2 | 2 | 4 |
| Supply Voltage Range | 8V to 18V | 8V to 18V | 8V to 18V | 8V to 18V | 8V to 18V |
| Standby Function | Yes | Yes | Yes | Yes | Yes |
| Mute Function | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Dual BTL configuration provides high output power from low supply voltage (vs TDA7851L)
- Surface-mount PowerSO-20 package enables automated assembly (vs TDA7391)
- Integrated protection features enhance reliability (vs TDA7391PD)
Design Notes
Provide adequate power supply decoupling with a 1000uF electrolytic capacitor and a 100nF ceramic capacitor close to the supply pins. This ensures stable operation and minimizes ripple that could affect audio quality.
The PowerSO-20 package has an exposed pad that must be soldered to a large copper area on the PCB to ensure proper thermal management. For continuous high-power operation, consider adding a heatsink or thermal vias to dissipate heat effectively.
Control the standby and mute pins with a microcontroller or a simple RC network to ensure a pop-free power-up sequence. Avoid floating these pins, as they may cause unpredictable behavior.
Compliance Information
RoHS compliance is indicated by distributor listings. Other compliance details are not explicitly stated in the provided data.
