AN7125
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Package / Case | 12-SIP + Tab |
| Mfr | Panasonic Electronic Components |
| Mounting Type | Through Hole |
| Operating Temperature | -25°C ~ 75°C (TA) |
| Type | Class AB |
| Output Type | 2-Channel (Stereo) |
| Supplier Device Package | 12-SIL |
| Voltage - Supply | 6V ~ 18V |
| Max Output Power x Channels @ Load | 12W x 2 @ 4Ohm |
| Features | Mute, Short-Circuit and Thermal Protection, Standby |
| Package | Bulk |
| Product Status | Obsolete |
| Base Product Number | AN7125 |
| Other Names | AN7125-NDR |
| Standard Package | 15 |
| ECCN | EAR99 |
| HTSUS | 8542.33.0001 |
AN7125 Audio Power Amplifier IC 2-Channel (Stereo) Class AB
The AN7125 is a classic dual-channel audio power amplifier ic originally developed by Panasonic Semiconductor. It is designed as a Class AB amplifier in a 12-pin SIP (Single In-line Package) and is capable of delivering 2.8 watts per channel into a 4-ohm load with 10% total harmonic distortion (THD) from a typical 9V power supply. Renowned for its simplicity, reliability, and built-in protection features, it has been widely used in consumer audio applications such as portable radios, cassette players, and small multimedia speakers.
This amplifier IC is ideal for low-to-medium power audio playback systems. Its primary applications include:
● Driving small speakers in portable audio devices like boom boxes, personal radios, and vintage cassette players.
● Serving as the audio output stage in educational electronics kits, DIY audio projects, and simple intercom systems.
● Providing amplification in multimedia computer speakers, television audio modules, and other consumer electronic products where cost-effective audio output is needed.
● Acting a reference design or a legacy replacement part in maintenance and repair scenarios for older audio equipment.
Frequently Asked Questions (FAQ):
Q1: What are the typical external components required for a basic stereo amplifier circuit using the AN7125?
A: A basic application circuit requires input coupling capacitors (e.g., 1µF), feedback network resistors (e.g., 47kΩ and 1kΩ for gain setting), a bootstrap capacitor for each channel, power supply decoupling capacitors placed close to the IC pins, and external speakers.
Q2: What is a common troubleshooting step if one channel of an AN7125-based amplifier has no sound output?
A: A systematic approach is recommended. First, verify the power supply voltage is present and within the 6V-18V range. Next, check the input signal path and coupling capacitor for that channel. Then, inspect the feedback resistor network for opens or incorrect values. Finally, measure the DC voltage at the output pin; it should be approximately half the supply voltage.
Compatible Alternative audio amplifier List
● TDA2822M: A popular STMicroelectronics dual low-voltage power amplifier with similar output power (~1W per channel), often used as a functional substitute in small audio applications, available in a 8-pin DIP or SOP package.
● LM386: A classic National Semiconductor (now Texas Instruments) low voltage audio power amplifier, capable of up to ~0.7W output, widely used in simple, low-power audio projects as an alternative for very basic amplification needs.
● KA2209 / TBA820M: These are other historical dual and single-channel audio amplifier ICs from Samsung and STMicroelectronics respectively, which were commonly used in similar consumer audio applications during the same era.
