The TDA2004R is a Class B dual audio power amplifier housed in a Multiwatt11 package, specifically designed for car radio systems. It supports high output currents up to 3.5 A and can drive low-impedance loads as low as 1.6 Ω. With minimal external components required and no need for electrical insulation between the package and heatsink, the TDA2004R enables efficient and space-saving automotive audio applications.
The TDA2004R operates as a Class B dual audio power amplifier. In Class B operation, each of the two output transistors conducts for exactly half of the input signal waveform — one for the positive half-cycle and the other for the negative half. This allows the device to amplify audio signals efficiently with relatively low power loss. Internally, the chip integrates two amplifiers, enabling stereo output or bridge-mode configuration for higher power.
Pin 1 (INPUT+ 1): Non-inverting input for channel 1
Pin 2 (INPUT– 1): Inverting input for channel 1
Pin 3 (SVRR): Supply voltage rejection ratio filtering
Pin 4 (INPUT– 2): Inverting input for channel 2
Pin 5 (INPUT+ 2): Non-inverting input for channel 2
Pin 6 (GND): Ground
Pin 7 (BOOTSTRAP 2): Bootstrap capacitor connection for channel 2
Pin 8 (OUTPUT 2): Output for channel 2
Pin 9 (+VS): Positive power supply
Pin 10 (OUTPUT 1): Output for channel 1
Pin 11 (BOOTSTRAP 1): Bootstrap capacitor connection for channel 1
The TDA2004R test and application circuit is a typical dual-channel audio power amplifier design, widely used in car radio systems to drive left and right speakers. The input stage couples the left and right audio signals via capacitors C1 and C2, effectively blocking DC components to protect the internal bias of the amplifier. The left channel enters through pin 5 (non-inverting) and pin 4 (inverting), while the right channel uses pins 1 and 2, with feedback networks formed by components like R1, C5, R4, and C7 to define gain and frequency response, ensuring clean and natural sound.
For power supply, pin 9 receives the positive voltage, and a 120 kΩ resistor with a 10 µF capacitor connects to pin 3 (SVRR) to suppress ripples and improve noise rejection. Pin 6 is grounded. Pins 11 and 7 connect to bootstrap capacitors (C6 and C7) that enhance output voltage swing, enabling better low-impedance load driving capability.
Outputs from pin 10 (left) and pin 8 (right) go to the speakers through large coupling capacitors (C10 and C11, 2200 µF), which block any DC offset. Small resistors in series with outputs (R5–R8) serve for current sensing and short-circuit protection.
For additional protection in automotive systems, components like eFuses and ideal diodes can help prevent damage from reverse polarity or power surges. Learn how to enhance system robustness in this article.
| Parameter | Specification |
| Package Type | 11-Multiwatt |
| Supply Voltage (VS) | 8V ~ 18V |
| Max Output Power x Channels @ Load | 12W x 2 @ 2Ohm |
| Output Type | 2-Channel (Stereo) |
| Maximum Output Current | 3.5 A |
| Total Harmonic Distortion | < 1% @ 1 kHz |
| Voltage Gain | 32 dB |
| Operating Temperature Range | -40°C ~ 150°C |
| Load Impedance | ≥ 1.6 Ω |
| Channel Separation | ≥ 40 dB |
| Quiescent Current | ~100 mA |
Low distortion
Low noise
Output AC short circuit to ground
Overrating chip temperature
Load dump voltage surge
Fortuitous open ground
Very inductive loads
Car radio power amplifiers
Dual-channel car stereo systems
Portable audio systems
DIY audio amplifier kits
Low-cost public address systems
Educational audio electronics projects
Datasheet PDF(https://dir.heisener.com/DatasheetDownload/TDA2004R.pdf)
The TDA2004R comes in a Multiwatt-11 package, featuring 11 pins arranged compactly with an integrated heatsink tab. This package type is designed for power amplifier applications, providing efficient heat dissipation to enhance device stability and reliability, while allowing easy mounting and connection on the circuit board.
The TDA2004R is a dual audio power amplifier IC commonly used in car audio and home audio applications.
It comes in a Multiwatt-11 package, which includes 11 pins and features a built-in heatsink tab for better heat dissipation.
No, the TDA2004R is designed as a dual channel amplifier but does not support bridge-tied load (BTL) configuration.
It supports stereo (two-channel) operation by default, but you can use one channel for mono amplification if needed.
