component
XC121S021
Public Made by Adomby adom
Si Change Analog To Digital Converters (ADC), SOT-23-6. 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
markdownXC121S021
Si Change · Analog To Digital Converters (ADC) · SOT-23-6
XC121S021 from Si Change, in a SOT-23-6. 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 | VA | power_in | Power supply input (3.3 V to 5.25 V single supply), which also serves as the ADC reference voltage. |
| 2 | GND | power_in | Analog input signal ground; all analog and digital signals are referenced to this pin. |
| 3 | VIN | power_in | Analog signal input with a range of 0 V to VA; VA should be set at or above the maximum VIN to avoid saturating the maximum conversion code. |
| 4 | SCLK | input | Serial clock input that directly controls the conversion and readout process; the 16th falling edge ends the conversion cycle. |
| 5 | SDATA | output | Serial data output carrying MSB-first conversion data after three leading zeros, and entering three-state at the 16th falling SCLK edge. |
| 6 | CS | input | Active-low chip select; a falling edge with SCLK starts a conversion, and CS must be taken high after 16 SCLK cycles before the next conversion. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Si Change |
| Package | SOT-23-6 |
| Category | Data Acquisition |
| Pins | 6 |
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 range (single supply) | VA | 3.3 | 5.25 | V | 1 | ||
| Operating temperature range | -40 | 85 | ℃ | 1 | |||
| Sampling rate | 50 | 200 | KSPS | 2 | |||
| Integral nonlinearity (INL) | -1 | 1 | LSB | 1 | |||
| Differential nonlinearity (DNL) | -1 | 1 | LSB | 1 | |||
| Signal-to-noise ratio (SNR) | 72.5 | dB | @100 KHz | 2 | |||
| Total harmonic distortion (THD) | -83.5 | dB | @100 KHz | 2 | |||
| Typical power consumption at 5 V, 200 KSPS | 2.35 | mW | 5V, 200 KSPS | 1 | |||
| Typical power consumption at 3.3 V, 200 KSPS | 1.2 | mW | 3.3V, 200 KSPS | 1 |
CAD (KiCad official)
- Symbol:
XC121S021 - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
xc121s021-etched.step/xc121s021-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);xc121s021.step/xc121s021.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Si Change datasheet (4 pp, sha256
3d1e5cfbdc22022f, retrieved 2026-10-18, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- 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).