The TDA2003 is an improved version of the TDA2002, offering better performance and higher reliability in a 5-pin Pentawatt package. It is specifically designed for automotive applications and general-purpose audio amplification. The TDA2003 allows for high output current capability (up to 3.5A) and very low harmonic and cross-over distortion. It features a unique protection circuit that safeguards the IC against overvoltages (up to 40V) and short circuits between pins and ground. Its ability to deliver substantial power from a single 12V supply has made it a favorite for car radio replacements and portable sound systems.
TDA2003 Pinout (Pentawatt)
Like the TDA2030, the TDA2003 uses the 5-pin Pentawatt package. Looking at the front of the IC, the pins are numbered 1 to 5 from left to right.
| Pin | Terminal | Function |
| 1 | Non-Inverting Input (+) | Audio signal input |
| 2 | Inverting Input (–) | Feedback pin to set the amplifier gain |
| 3 | Ground (GND) | Shared negative supply or ground pin |
| 4 | Output | Amplified signal out to the speaker |
| 5 | VCC | Positive supply voltage (Typically 12V to 18V) |
Technical Specifications
- Supply Voltage (VS): 8V to 18V
- Output Power: 10W (at 2Ω load, 14.4V) / 6W (at 4Ω load, 14.4V)
- Peak Output Current: 3.5A
- Voltage Gain: 40 dB (Adjustable with external components)
- Frequency Response: 40 Hz to 15 kHz
- Quiescent Current: 44mA to 50mA
- Total Harmonic Distortion (THD): 0.15% (Typical)
Key Features & Benefits
- Automotive Rated: Highly resistant to the electrical noise and voltage spikes found in vehicles.
- Low External Part Count: Requires very few capacitors to build a complete 10W amplifier.
- High Output Current: Can drive low-impedance speakers (down to 2Ω) with ease.
- Space Saving: The compact TO-220-5 (Pentawatt) footprint saves significant PCB space.
Common Applications
- Car Stereo Repair: Replacing older output stages in vehicle head units.
- Portable Speakers: Driving full-range speakers in battery-powered audio boxes.
- Siren Systems: Amplifying alarm tones for security or vehicle sirens.
- Home Intercoms: Providing clear audio for residential or office communication systems.
TDA2003 Equivalent & Substitutes
- LM2003 (Direct equivalent)
- TDA2002 (Lower power, older version)
- NTE1288 (Industry standard cross-reference)
- μPC2003 (Japanese equivalent variant)
Related Tutorials on ElxHub
- Basics: Learn more in Integrated Circuits – Basics and Working
- Selection Guide: Compare power options in our Ultimate IC Selection Guide
Conclusion
The TDA2003 is the perfect bridge between low-power hobbyist ICs and high-power professional amplifiers. Its ruggedness and ability to operate efficiently on a single 12V rail make it an ideal choice for mobile and automotive audio projects. For any designer looking for a punchy, reliable amplifier that is easy to build, the TDA2003 remains a top-tier candidate.
Download the IC’s Datasheet pdf
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