E-TDA7377 - 2x38W Dual/Quad Audio Amplifier | STMicroelectronics
MPN: E-TDA7377 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.1924 | $1.19 |
E-TDA7377 Overview
An audio power amplifier is an electronic device that increases the amplitude of low-power audio signals to a level sufficient to drive loudspeakers. In a car audio system, the amplifier takes the low-level signal from the head unit and boosts it to drive the speakers, providing the necessary current and voltage swing. The E-TDA7377 belongs to the class AB amplifier family, which offers a good compromise between efficiency and linearity, making it suitable for high-fidelity audio reproduction.
Key features of the E-TDA7377 include a wide supply voltage range (8V to 18V), low quiescent current, and high output power. It incorporates standby and mute functions for power management, and features short-circuit, thermal, and over-voltage protection. The device also has a very low external component count, simplifying PCB design and reducing system cost.
The E-TDA7377 uses a complementary NPN/PNP output stage with a Darlington configuration, providing high current gain and low output impedance. The amplifier is designed to operate with a single-ended or bridge-tied load (BTL) configuration, allowing flexible system design. The Multiwatt-15 package includes a metal tab for heatsinking, enabling efficient heat dissipation in high-power applications.
Typical applications include car radio amplifiers, active speaker systems, and high-power audio systems. In a car radio, the E-TDA7377 can drive four speakers directly, providing a complete audio solution with minimal external components. The device's high output power and low distortion make it suitable for high-quality audio reproduction.
When designing with the E-TDA7377, ensure adequate heatsinking is provided to keep the junction temperature within safe limits. The standby and mute pins allow for power management and pop-free turn-on/off. Proper PCB layout with short, wide traces for power and ground is essential to minimize noise and ensure stable operation.
Drop-in alternatives for E-TDA7377 — 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-TDA7377 (same form factor and footprint) — differing in Number of Channels, Mounting Type, Package, Supply Voltage Range, Input Impedance.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TDA7377
✅ Drop-In📋 Reference alternative (not in catalog)
TDA7375
⚡ Same Package ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
TDA7379
⚡ Same Package ⚠️ Specs Unverified✓ In Stock
$1.39 / Unit
View Datasheet →E-TDA7377 Maximum Ratings & Electrical Characteristics
| Output Power (BTL) | 2x38W at 14.4V, 4Ω, 10% THD |
| Output Power (Single-Ended) | 4x10W at 14.4V, 4Ω, 10% THD |
| Supply Voltage Range | 8V to 18V |
| Quiescent Current | 120 mA (typical) |
| Total Harmonic Distortion (THD) | 0.03% at 1kHz, 1W |
| Signal-to-Noise Ratio | 90 dB (typical) |
| Input Impedance | 30 kΩ (typical) |
| Output Offset Voltage | ±50 mV (max) |
| Standby Current | 1 μA (typical) |
| Operating Temperature Range | -40°C to +150°C |
| Package | Multiwatt-15 |
| Mounting Type | Through Hole |
| Number of Channels | 4 (quad) or 2 (bridge) |
| Protection Features | Short-circuit, thermal, over-voltage |
| RoHS Status | Compliant |
E-TDA7377 Pin Configuration
| Pin 1 | OUT1 — Output channel 1 |
| Pin 2 | GND — Ground |
| Pin 3 | IN1 — Input channel 1 |
| Pin 4 | IN2 — Input channel 2 |
| Pin 5 | GND — Ground |
| Pin 6 | OUT2 — Output channel 2 |
| Pin 7 | VS — Supply voltage |
| Pin 8 | OUT3 — Output channel 3 |
| Pin 9 | GND — Ground |
| Pin 10 | IN3 — Input channel 3 |
| Pin 11 | IN4 — Input channel 4 |
| Pin 12 | GND — Ground |
| Pin 13 | OUT4 — Output channel 4 |
| Pin 14 | STBY — Standby control |
| Pin 15 | MUTE — Mute control |
Typical Applications
E-TDA7377 is suitable for 6 applications: Car Radio Amplifier, Active Speaker System, Home Theater System, Portable PA System, Musical Instrument Amplifier, Public Address System.
Car Radio Amplifier
The E-TDA7377 is designed for car radio applications, providing high output power (2x38W) to drive speakers directly. Its wide supply voltage range (8V to 18V) accommodates automotive battery variations. The built-in protections (short-circuit, thermal, over-voltage) ensure reliable operation in harsh environments. The standby and mute functions enable power management and pop-free operation. With minimal external components, it simplifies PCB design and reduces system cost.
Recommended
Active Speaker System
In active speaker systems, the E-TDA7377 can be used to amplify audio signals for each driver (woofer, tweeter). Its low THD (0.03%) ensures high-fidelity sound reproduction. The quad single-ended mode (4x10W) allows driving four speakers independently. The Multiwatt-15 package with metal tab facilitates heatsinking for continuous high-power operation. The mute function prevents turn-on/off pops, enhancing user experience.
Recommended
Home Theater System
The E-TDA7377 can be used in home theater systems to drive surround sound speakers. Its high output power (2x38W) provides sufficient volume for medium-sized rooms. The bridge-tied load configuration allows doubling the output power per channel. The low quiescent current (120 mA) reduces power consumption during idle. The standby function further reduces power draw when the system is not in use.
Recommended
Portable PA System
For portable PA systems, the E-TDA7377 offers a compact solution with high output power. Its 8V to 18V supply range allows operation from batteries or external power supplies. The low quiescent current extends battery life. The protection features prevent damage from short circuits or overheating. The Multiwatt-15 package is suitable for through-hole mounting, simplifying assembly.
Recommended
Musical Instrument Amplifier
The E-TDA7377 can be used in musical instrument amplifiers, such as guitar or keyboard amps. Its low distortion (0.03% THD) preserves the tonal quality of the instrument. The high output power (2x38W) provides ample volume for practice or small performances. The mute function allows silent tuning. The thermal protection ensures reliable operation during extended use.
Recommended
Public Address System
In public address systems, the E-TDA7377 can drive multiple speakers for announcements or background music. Its high output power and low distortion ensure clear audio reproduction. The bridge-tied load configuration allows driving 4Ω speakers with high power. The standby function reduces power consumption when the system is idle. The over-voltage protection safeguards against supply transients.
Recommended
Recommended Products Summary
Engineering reference data for E-TDA7377 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TDA7377 | TDA7375 | TDA7379 |
|---|---|---|---|---|
| Package | Multiwatt-15 | Multiwatt-15 | Multiwatt-15 | Multiwatt-15 |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Output Power (BTL) | 2x38W | 2x38W | 2x20W | 2x40W |
| Supply Voltage Range | 8V to 18V | 8V to 18V | 8V to 18V | 8V to 18V |
| Quiescent Current | 120 mA | 120 mA | 100 mA | 150 mA |
| THD at 1kHz, 1W | 0.03% | 0.03% | 0.05% | 0.03% |
| Signal-to-Noise Ratio | 90 dB | 90 dB | 85 dB | 90 dB |
| Pinout Compatibility | Reference | Identical | Different | Different |
Key Differentiators
- High output power in BTL mode (vs TDA7375)
- Low distortion (vs TDA7375)
- Higher signal-to-noise ratio (vs TDA7375)
Design Notes
The E-TDA7377 can dissipate significant power at high output levels. For example, at 2x38W output, the power dissipation can exceed 20W. The Multiwatt-15 package has a metal tab that must be connected to a heatsink. Ensure the heatsink has sufficient thermal capacity to keep the junction temperature below 150°C. Use thermal compound between the tab and heatsink for optimal heat transfer.
For optimal performance, use short, wide traces for power and ground connections to minimize resistance and inductance. Place decoupling capacitors (100 nF and 1000 μF) close to the VS pin. Separate the ground paths for the power stage and signal stage to avoid ground loops and reduce noise. The standby and mute pins should be controlled with pull-up or pull-down resistors as specified in the datasheet.
Do not exceed the maximum supply voltage of 18V, as this can damage the amplifier. Ensure the standby and mute pins are properly driven to avoid unintended operation. When using bridge-tied load configuration, do not connect the speaker to ground, as this can cause short-circuit. Always use a heatsink, as operating without one can lead to thermal shutdown or permanent damage.
Compliance Information
RoHS compliant per STMicroelectronics product page. Not AEC-Q100 qualified as it is not an automotive-grade IC, but designed for automotive audio applications.
