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SI4825-A10 Full-Band Radio Receiver IC — SOP-16, AM/FM/SW, Analog Tuning (5-Pack)
SI4825-A10 Full-Band Radio Receiver IC SOP-16, AM/FM/SW, Analog Tuning (5-Pack)
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SI4825-A10 Full-Band Radio Receiver IC — SOP-16, AM/FM/SW, Analog Tuning (5-Pack)
The SI4825-A10 from Silicon Laboratories is a single-chip full-band radio receiver IC supporting AM (520–1710kHz), FM (64–108MHz), and shortwave (2.3–21.85MHz) reception. Unlike digital-tuned receivers, it uses analog potentiometer tuning for a classic radio feel, making it ideal for DIY portable radios, retro-style FM receivers, and shortwave radio projects. Operating from 2.0–3.6V, it integrates the complete RF front-end, IF filter, demodulator, and audio output in a single SOP-16 package.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOP-16 (SMD) |
| AM Band | 520–1710kHz |
| FM Band | 64–108MHz (covers worldwide FM bands) |
| Shortwave Band | 2.3–21.85MHz (11 SW bands) |
| Tuning Method | Analog (external potentiometer) |
| Supply Voltage | 2.0–3.6V |
| Audio Output | Differential analog (drives headphones directly) |
| Interface | No I²C/SPI — fully analog control |
| Quantity | 5 pieces |
Why Choose SI4825-A10?
- True analog tuning — potentiometer-controlled frequency for a classic radio experience, no microcontroller needed
- AM + FM + 11 SW bands — complete world-band radio coverage in one IC
- Single-chip solution — integrates RF, IF, demodulator, and audio output, minimal external components
- 2.0–3.6V operation — runs directly from 2×AA batteries or a single Li-ion cell
- Direct headphone drive — differential audio output drives 32Ω headphones without an external amplifier
Compatible With / Common Use Cases
- DIY portable AM/FM/SW radio: Minimal BOM — IC + antenna + potentiometer + headphones
- Retro-style FM radio kit: Analog dial tuning for vintage radio aesthetics
- Shortwave receiver: 11 SW bands covering international broadcasts (BBC, VOA, etc.)
- Battery-powered radio: 2×AA or single Li-ion powered portable receiver
- Electronics education: RF receiver design without complex RF engineering
Frequently Asked Questions
Q: Does SI4825-A10 require a microcontroller to operate?
A: No — this is a key advantage of the SI4825. It uses analog potentiometers for band selection and frequency tuning, so no Arduino or MCU is needed. This makes it ideal for simple, low-component-count radio designs.
Q: What is the difference between SI4825-A10 and SI4825-B20?
A: The SI4825-A10 covers AM/FM/SW with analog tuning. The SI4825-B20 adds I²C digital control for frequency setting via microcontroller. Choose A10 for pure analog designs, B20 for MCU-controlled digital tuning.
Q: What antenna do I need for FM and shortwave reception?
A: For FM: a 75cm wire antenna (quarter-wave at ~100MHz) connected to the FM antenna pin. For AM: a ferrite bar antenna (loopstick) connected to the AM differential input pins. For shortwave: a 1–3m wire antenna provides good reception across the SW bands.
Package Contents
- 5× SI4825-A10 Full-Band Radio Receiver IC (SOP-16)
