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Contents

Pinout
Key specifications
Electrical characteristics
CAD (KiCad official)
Provenance

README

markdown

XC121S051

Si Change · Analog To Digital Converters (ADC) · SOT-23-6

XC121S051 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; the VA range is 3.3 V to 5.25 V.
2	GND	power_in	Ground for the power supply; all analog and digital signals are referenced to this pin.
3	VIN	power_in	Analog input that can range from 0 V to VA.
4	SCLK	input	Digital clock input that directly controls the conversion and readout processes.
5	SDATA	output	Digital data output; samples are clocked out on the falling edges of SCLK, and the pin returns to three-state mode after each transfer.
6	CS	input	Chip select; a conversion starts on the falling edge of CS, and CS going high before the 10th SCLK falling edge powers the device down and stops the 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
Integral linearity		-1		1	LSB		2
Differential linearity		-1		1	LSB		2
Throughput rate	fSAMPLE	200		500	KSPS	fSCLK = 10 MHz, 3.3 V ≤ VDD ≤ 5.25 V	2
Supply current, normal operation (fSAMPLE = 500 KSPS, fSCLK = 10 MHz, VDD = 3.3 V)	IDD		0.52	0.55	mA	Digital inputs = 0 V or VDD	2
Supply current, normal operation (fSAMPLE = 500 KSPS, fSCLK = 10 MHz, VDD = 5 V)	IDD		0.85	0.92	mA	Digital inputs = 0 V or VDD	2
Supply current, normal operation (fSAMPLE = 250 KSPS, fSCLK = 5 MHz, VDD = 3.3 V)	IDD		0.35	0.38	mA	Digital inputs = 0 V or VDD	2
Supply current, normal operation (fSAMPLE = 250 KSPS, fSCLK = 5 MHz, VDD = 5 V)	IDD		0.55	0.65	mA	Digital inputs = 0 V or VDD	2
Power dissipation, normal operation (fSAMPLE = 500 KSPS, fSCLK = 10 MHz, VDD = 3.3 V)			1.72	1.81	mW	fSAMPLE = 500 KSPS, fSCLK = 10 MHz, VDD = 3.3 V	2
Power dissipation, normal operation (fSAMPLE = 500 KSPS, fSCLK = 10 MHz, VDD = 5 V)			4.25	4.6	mW	fSAMPLE = 500 KSPS, fSCLK = 10 MHz, VDD = 5 V	2
Signal-to-noise ratio	SNR		72.5		dB	fIN = 100 kHz, 3.3 V ≤ VDD ≤ 5.25 V	2
Total harmonic distortion	THD		-83.5		dB	fIN = 100 kHz, 3.3 V ≤ VDD ≤ 5.25 V	2
Supply voltage (VA)	VA	3.3		5.25	V	Single power supply range	1
Operating temperature range		-40		85	°C		1

CAD (KiCad official)

Symbol: XC121S051
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)
3D model files: xc121s051-etched.step / xc121s051-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); xc121s051.step / xc121s051.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Si Change datasheet (5 pp, sha256 88895db9f2652c79, retrieved 2026-10-18, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-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).

Datasheet PDF