on November 15th 82

Comprehensive Guide to TDA7377 Audio Amplifier

The TDA7377 is a powerful and flexible audio amplifier often used in car audio systems. This article will guide you through its features, applications, and safety benefits, helping you understand how it can improve your sound experience.

Catalog

Overview of TDA7377

The TDA7377 is designed for car radio amplifiers and stands out for its ability to operate in two modes: dual bridge and quad single-ended. This flexibility makes it suitable for various audio applications. The amplifier’s structure uses a fully complementary design, which helps it deliver strong performance without needing many extra components. It also includes an onboard clip detector that makes gain adjustment simpler, ensuring you get the best audio output without distortion. Additionally, it comes with built-in fault diagnostics, a useful feature for identifying issues during installation or wiring in car audio systems. This thoughtful design ensures a reliable and user-friendly experience, even for those with limited technical knowledge.

TDA7377 Pin Configuration

Pin No	Pin Name	Description
1	OUT 1	Output 1
2	OUT 2	Output 2
3	VCC	Collector Supply Voltage
4	IN 1	Input 1
5	IN 2	Input 2
6	SVR	Supply Voltage Rejection
7	ST-BY	Stand By
8	PW-GND	Power Ground
9	S-GND	Signal Ground
10	DIAG	Diagnostics
11	IN 4	Input 4
12	IN 3	Input 3
13	VCC	Collector Supply Voltage
14	OUT 4	Output 4
15	OUT 3	Output 3

TDA7377 CAD Model

TDA7377 Symbol

TDA7377 Footprint

TDA7377 Specifications

Technical specifications, features, characteristics, and components with comparable specifications of STMicroelectronics TDA7377.

Type	Parameter
Number of Pins	15
Part Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Type	Class AB
Voltage - Supply	8V~18V
Base Part Number	TDA7377
Output Type	2-Channel (Stereo) or 4-Channel (Quad)
Operating Supply Voltage	18V
Max Output Power	35W
Max Output Power x Channels @ Load	35W x 2 @ 4 Ω; 10W x 4 @ 2 Ω
Features	Depop, Short-Circuit and Thermal Protection, Standby
RoHS Status	ROHS3 Compliant

Features of TDA7377

Compact Dimensions

The TDA7377 has a compact design, measuring 60×56×50. This makes it easier to fit into small spaces, which is especially helpful in car audio setups or other projects where space is limited.

High Output Power

With a power output of 35W+35W, the TDA7377 ensures you get clear and powerful sound, making it suitable for use with a wide range of speakers.

Flexible Power Supply

The amplifier works with a DC power supply ranging from 9V to 15V, requiring 50-100W. This gives you flexibility when selecting a compatible power source.

Stereo Channel Configuration

The TDA7377 supports a 2.0 stereo channel setup, delivering audio that feels more immersive and balanced for the listener.

Wide Frequency Response

Its response frequency ranges from 20Hz to 20KHz, allowing it to handle a broad spectrum of sounds, from deep bass to high treble.

Speaker Compatibility

This amplifier works well with speakers rated between 4Ω and 8Ω and power levels from 20W to 120W. Whether you’re using small bookshelf speakers or larger floor speakers, this amplifier can match your needs.

Applications and Usage of TDA7377

Connecting to Speakers

To set up the amplifier with your speakers, connect the speaker wires to the output ports of the TDA7377. Make sure the left speaker is connected to the LOUT port and the right speaker to the ROUT port. Align the positive and negative wires correctly to ensure proper functionality.

Connecting to Sound Sources

You can connect the amplifier to an audio source, like a computer, phone, or MP3 player, using a 3.5mm stereo cable. One end goes into the audio source, and the other plugs into the amplifier’s input jack, allowing you to play your favorite audio.

Connecting to Power Supply

The TDA7377 requires a power supply with an output of DC 12V3A or higher. You can connect the adapter cables to the amplifier's power port, ensuring proper polarity. If you use a voltage converter instead, polarity won't matter as it works with alternating current.

Playing Music

Once everything is connected, plug in the power supply. A blue indicator light will show that the amplifier is ready. You can then adjust the volume knob to your preferred level and enjoy your music.

TDA7377 Test and Application Circuits

The followings are the test and application circuits of TDA7377.

TDA7377 Protection Features

Protection Against Voltage Surges

The TDA7377 is designed to handle unexpected voltage surges, such as those caused by load dumps. This feature ensures the amplifier remains functional even during sudden power fluctuations, protecting your system from damage.

Reversed Battery Protection

In cases where the battery connections are mistakenly reversed, the TDA7377 includes a safeguard to prevent damage to the amplifier. This feature helps you avoid costly repairs or replacements due to accidental wiring mistakes.

Short Circuit Safeguards

The amplifier is equipped to handle short circuits, whether they occur in DC or AC. If the output is accidentally shorted to ground, VCC, or across the load, the amplifier reduces current flow to prevent overheating or permanent damage, keeping your setup safe.

Silent Turn On/Off

The TDA7377 is designed to eliminate loud popping noises that can occur during power on or off. This silent operation protects your speakers and ensures a more pleasant experience when using the amplifier.

Thermal Shutdown

To prevent overheating, the amplifier includes a thermal shutdown feature. If the internal temperature rises beyond safe levels, the amplifier shuts down automatically, protecting its components and ensuring longevity.

Handling Inductive Loads

The TDA7377 is capable of managing inductive loads, such as highly inductive speakers. This ability allows it to deliver stable performance even with speakers that may present challenging electrical characteristics.

Open Ground Safety

If the ground connection is accidentally left open, the TDA7377 is built to tolerate this situation without immediate failure. This feature provides an additional layer of reliability, especially during installation or troubleshooting.

ESD Protection

The amplifier includes protection against electrostatic discharge (ESD). This safeguards the TDA7377 from damage caused by sudden electrical shocks, enhancing its durability and reliability in everyday use.

Dimensions of TDA7377

Manufacturer Information of TDA7377

STMicroelectronics is a well-known name in the semiconductor world, recognized for creating reliable solutions for a wide range of electronic applications. They bring together advanced design skills, strong production capabilities, and good partnerships with other industry leaders. These strengths have allowed them to lead the way in developing System-on-Chip (SoC) technology. The TDA7377 reflects their commitment to innovation, offering features that make audio enhancement more accessible and efficient. Whether you're upgrading a car's sound system or working on a similar project, you can trust the quality and performance of a product backed by such a reputable manufacturer.

Datasheet PDF

TDA7377 Datasheet:

TDA7377.pdf