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SI4825-A10-CSR
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SKYWORKS SILICON LABS RF Transceiver ICs, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSI4825-A10-CSR
SKYWORKS SILICON LABS · RF Transceiver ICs · SOIC-16
SI4825-A10-CSR from SKYWORKS SILICON LABS, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | LNA_EN | output | Enables an external SW LNA (the datasheet gives no voltage or current limits for this pin). |
| 2 | TUNE1 | passive | Frequency tuning input; a valid channel is found by tuning the potentiometer connected to TUNE1 and TUNE2 (potentiometer value 100 kΩ in the typical BOM). |
| 3 | TUNE2 | passive | Frequency tuning input; used together with TUNE1 for the tuning potentiometer, with absolute maximum input current of 10 mA. |
| 4 | BAND | input | Selects the band and the de-emphasis time constant; absolute maximum input current is 10 mA. |
| 5 | NC | unconnected | No connect; leave floating. |
| 6 | FMI | input | FM RF input, connected to the FM antenna trace; the RF input level is limited to 0.4 VPK (absolute maximum). |
| 7 | RFGND | power_in | RF ground; connect to the PCB ground plane. |
| 8 | AMI | input | AM RF input, connected to the AM antenna; the RF input level is limited to 0.4 VPK (absolute maximum). |
| 9 | RST | input | Active-low device reset input; RSTB must be held low at least 100 µs after the supply ramps up and asserted before VDD ramps down. |
| 10 | VOL+ | input | Volume button up input for direct digital volume control; absolute maximum input current is 10 mA. |
| 11 | VOL- | input | Volume button down input for direct digital volume control; absolute maximum input current is 10 mA. |
| 12 | XTALO | output | Crystal oscillator output for a 32.768 kHz crystal (crystal frequency tolerance ±100 ppm). |
| 13 | XTALI | input | Crystal oscillator input or external reference clock input, supporting 32.768 kHz with ±100 ppm tolerance; absolute maximum input current is 10 mA. |
| 14 | VDD | power_in | Supply voltage of 2.0 to 3.6 V (recommended 2 to 3.6 V, absolute maximum -0.5 to 5.8 V); may be connected directly to battery. |
| 15 | GND | power_in | Ground; connect to the PCB ground plane. |
| 16 | AOUT | output | Audio output; load resistance at least 10 kΩ and load capacitance at most 50 pF (single-ended). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | SKYWORKS SILICON LABS |
| Package | SOIC-16 |
| Category | RF And Wireless |
| Pins | 16 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply Voltage | VDD | 2 | 3.6 | V | 4 | ||
| Ambient Temperature Range | TA | 0 | 25 | 70 | °C | 4 | |
| Power Supply Powerup Rise Time | VDDRISE | 10 | µs | 4 | |||
| RSTB Pulse Width | tPRST | 100 | µs | VDD = 2.7 to 3.6 V, TA = 0 to 70 °C | 5 | ||
| VDD valid time before RSTB rises | tSRST | 100 | µs | VDD = 2.7 to 3.6 V, TA = 0 to 70 °C | 5 | ||
| RSTB low time before VDD becomes invalid | tRRST | 0 | µs | VDD = 2.7 to 3.6 V, TA = 0 to 70 °C | 5 | ||
| Input Frequency (FM) | fRF | 64 | 109 | MHz | VDD = 2.7 to 3.6 V, TA = 0 to 70 °C | 6 | |
| Audio Output Load Resistance | RL | 10 | k | Single-ended | 6 | ||
| Audio Output Load Capacitance | CL | 50 | pF | Single-ended | 6 | ||
| Audio Frequency Response Low | 30 | Hz | -3 dB | 6 | |||
| Audio Frequency Response High | 15 | kHz | -3 dB | 6 | |||
| Audio THD | 0.1 | 0.5 | % | 6 | |||
| Input Frequency (Medium Wave, AM) | fRF | 504 | 1750 | kHz | Medium Wave (AM) | 7 | |
| Input Frequency (Short Wave, SW) | fRF | 2.3 | 28.5 | MHz | Short Wave (SW) | 7 | |
| Antenna Inductance | 180 | 450 | µH | 7 | |||
| Reference Clock Frequency Tolerance for XTALI | -100 | 100 | ppm | VDD = 2.7 to 3.6 V, TA = 0 to 70 °C | 7 | ||
| Crystal Frequency Tolerance | -100 | 100 | ppm | VDD = 2.7 to 3.6 V, TA = 0 to 70 °C | 7 | ||
| Board Capacitance | 3.5 | pF | VDD = 2.7 to 3.6 V, TA = 0 to 70 °C | 7 | |||
| Thermal Resistance | JA | 80 | °C/W | 8 | |||
| Junction Temperature | TJ | 77 | °C | 8 | |||
| Supply Voltage | VDD | -0.5 | 5.8 | V | 8 | ||
| Input Current | IIN | 10 | mA | Input pins RST, VOL+, VOL-, XTALO, XTALI, BAND, TUNE2, TUNE1, LNA_EN | 8 | ||
| Operating Temperature | TOP | -40 | 95 | C | 8 | ||
| Storage Temperature | TSTG | -55 | 150 | C | 8 | ||
| RF Input Level | 0.4 | VPK | At RF input pins FMI and AMI | 8 |
CAD (KiCad official)
- Symbol:
SI4825-A10-CSR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
si4825-a10-csr-etched.step/si4825-a10-csr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);si4825-a10-csr.step/si4825-a10-csr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: SKYWORKS SILICON LABS datasheet (21 pp, sha256
347ac3cf16abb9e3, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).