TDA7377 Integrated Circuit

The TDA7377 is a powerful and flexible Class AB audio amplifier IC designed to drive high-quality sound in both automotive and consumer audio systems. Capable of operating in the dual bridge (BTL) or quad single-ended (SE) modes, it delivers up to 2 × 35W or 4 × 6W output power respectively—making it a great fit for 2-channel and 4-channel audio configurations. Its fixed internal gain (20 dB SE / 26 dB BTL) and support for minimal external components make the TDA7377 an attractive choice for both professional engineers and audio hobbyists looking to reduce circuit complexity and cost.

Built-in diagnostic and protection features set the TDA7377 apart in terms of reliability. These include thermal shutdown alerts, clipping detection, and safeguards against short circuits, load dump events, ESD, and reverse battery polarity. Designed with pop-free standby and mute controls, the IC also ensures smooth user experiences without the annoying power-on noise typically found in audio systems. Housed in a rugged Multiwatt-15 package with an integrated heatsink tab, the TDA7377 is ideal for compact, high-power designs in car radios, multimedia speakers, and portable sound systems.

Key Features of the TDA7377

High Output Power:

• 2 × 35W max @ 4Ω (BTL) Bridge mode
• 4 × 6W @ 4Ω or 4 × 10W @ 2Ω (Single Ended)

Flexible Configuration:

• Dual bridge or quad single-ended modes

Minimal Components:

• No bootstrap capacitors or Boucherot cells needed
• Internally fixed gain: 26 dB (BTL), 20 dB (SE)

Pop-Free Operation:

• Silent standby and muting control (CMOS compatible)

Built-in Protection & Diagnostics:

• Clipping detection
• Thermal shutdown proximity
• Short to ground or supply
• Load dump and ESD protection

Other Features

• Internally fixed voltage gain (26 dB BTL / 20 dB SE)
• Very low Total Harmonic Distortion (0.02% – 0.03%)
• Rail-to-rail output stage design for better swing
• Reverse battery and ESD-protected
• Silent turn-on/off and transition functions

Technical Specifications of the TDA7377

Parameter	Value
Output Power	2×35W (BTL), 4×6W (SE)
Supply Voltage	8V – 18V (28V max, 50V peak)
THD	0.02% – 0.03%
Crosstalk	55 – 70 dB
Input Impedance	10kΩ (BTL), 20kΩ (SE)
Standby Current	100 µA
Operating Temperature	-40°C to +150°C

Applications of the TDA7377

The TDA7377 is a highly versatile audio amplifier IC and its applications span across both automotive and consumer electronics sectors. Here’s a list of its primary applications, with brief explanations to guide usage…

Car Audio Head Units

• Use Case: 2 or 4-speaker in-dash stereo systems
• Why: Offers high power (up to 35W x2), pop-free startup, and built-in diagnostics—ideal for vehicle environments.

Home Audio Amplifiers

• Use Case: Compact stereo or 4-channel audio systems
• Why: Low distortion and fixed gain simplify home amplifier designs with excellent sound clarity.

Multimedia Speaker Systems

• Use Case: Powered speakers for TVs, computers, and gaming consoles
• Why: Offers 4-channel or 2.1-channel configuration with minimal external components.

 Portable & DIY Audio Projects

• Use Case: Bluetooth speakers, boomboxes, classroom audio systems
• Why: Easy to integrate, operates on 12V, requires few passive components.

Educational Electronics & Training Kits

• Use Case: Lab experiments in audio electronics or embedded systems courses
• Why: Demonstrates concepts like bridge vs. single-ended output, thermal protection, and diagnostics.

Recreational Vehicles & Off-Grid Audio

• Use Case: Camper vans, boats, solar-powered systems
• Why: A wide voltage range (8–18V), robust protections, and efficient output make it suitable for off-grid applications.

Subwoofer Driver (Bridge Mode)

• Use Case: Drive a dedicated subwoofer using bridge-tied load output
• Why: BTL configuration doubles output voltage swing, ideal for low-frequency power.

Industrial Audio Notification Systems

• Use Case: Public announcement (PA) systems, machine alerts
• Why: Reliable performance and high volume output in rugged environments.

What is in the package and how to use the TDA7377

The package contains 1 × Original TDA7377 Audio Amplifier IC – (Heatsink not included – available separately in our store)

The TDA7377 is designed for easy integration into audio systems with minimal external components. Here’s how to use it effectively…

Choose Your Configuration

The TDA7377 supports two main modes:

• Dual Bridge (BTL) – For 2-channel high-power output (ideal for stereo or subwoofer)
• Quad Single-Ended (SE) – For 4-channel output (ideal for front/rear 4-speaker systems)

Use a jumper or short between input pins to configure bridge mode. Refer to the schematic diagram.

Connect Inputs and Outputs      

• Inputs: Connect your audio signals to IN1–IN4 through decoupling capacitors (typically 0.22–0.47 µF).
• Outputs: Connect speaker terminals to OUT1–OUT4 as per your selected configuration.

Power the IC

• Supply Voltage (V_S): 8V – 18V (typical), 28V max
• Add a large filter capacitor (e.g., 2200 µF) close to the power pin to stabilize the supply.
• Use a heatsink on the tab if you’re drawing higher output power.

Use the Standby and Mute Functions

• Pin 7 (ST-BY) controls power saving. Pull high (>3.5V) to enable audio low (<1.5V) to shut down.
• Use a resistor-capacitor (RC) filter to prevent audio pops during on/off transitions.

Monitor Diagnostics (Optional)

• Pin 10 provides diagnostic feedback:
  • Clipping
  • Thermal warning
  • Short circuits
• Connect to a microcontroller or LED for status indication.

Test and Tune

• Start with a 4Ω load per channel.
• Use a signal generator or audio source to test signal response.
• Adjust decoupling capacitor values if needed for low-frequency response.

Downloadable TDA7377 PDF Datasheet

Kindly click on the link ahead to view and download a PDF datasheet of the TDA7377… TDA7377 Datasheet PDF

Pin Diagram and Pinout Configuration (Multiwatt-15 Package)

Below is the complete image of the pinout diagram and the complete pin configuration table.

 

TDA7377 Pin Configuration (Multiwatt-15 Package)

Pin No.	Pin Name	Description
1	OUT1	Output Channel 1
2	OUT2	Output Channel 2
3	VCC	Positive Supply Voltage
4	INPUT1	Audio Input Channel 1
5	INPUT2	Audio Input Channel 2
6	SVR	Supply Voltage Rejection (bypass capacitor)
7	STAND-BY	Standby/Mute Control Input
8	PW-GND	Power Ground
9	S-GND	Signal Ground
10	DIAGNOSTIC OUT	Fault Detection Output (clipping, thermal)
11	INPUT4	Audio Input Channel 4
12	INPUT3	Audio Input Channel 3
13	VCC	Positive Supply Voltage (duplicate)
14	OUT4	Output Channel 4
15	OUT3	Output Channel 3

Sample Circuit/Schematic Diagram

Check out the sample circuit/schematic diagram of the TDA 7377 below…

Why Buy from Dukatronic?

At Dukatronic, we’re more than just a supplier—we’re your trusted electronics partner in Kenya. Here’s why thousands of engineers, makers, and businesses choose us:

• 100% Genuine Components: We stock only original ICs and components from trusted brands like STMicroelectronics. No counterfeits. No surprises.
• Fast & Reliable Shipping: Enjoy same-day dispatch for in-stock items and nationwide delivery via trusted couriers. Get your parts when you need them—no delays.
• Local Support: Need help with compatibility or circuit design? Our Kenya-based support team is ready to assist with your project needs—online or in-store.
• Fair Pricing & Bulk Discounts: Get competitive pricing on single units and volume discounts for bulk orders. We support hobbyists, schools, and professional builders alike.
• Easy Ordering & Secure Payments: Shop with confidence via our secure checkout system. We accept M-Pesa, card, and other local payment options.

Choose Dukatronic for quality components, expert support, and service you can count on. Order the TDA7377 Now…

Customer Reviews

★★★★★
“Used the TDA7377 in a DIY car amplifier project. Great output and dead silent startup. A real gem!”
— Simon M.

★★★★☆
“Compact and powerful. Easy to implement with just a few capacitors. Loved the diagnostic pin!”
— Brenda O.

★★★★★
“Saved a lot of board space with the integrated gain and protection features. Dukatronic delivered fast.”
— George N.

Ready to Power Up Your Next Audio Project?

The TDA7377 delivers the perfect blend of power, efficiency, and built-in protection—making it the ideal choice for car radios, home audio systems, and custom speaker builds.

• Easy to use
• Crystal-clear output
• Fully protected
• Available now at Dukatronic. See more ICs at our integrated circuits shop

Check out more TDA ICs below…

• TDA7379
• TDA8946J
• TDA7265