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Generated by kicad-footprint-generator · KiCad file format 20260206

Name	Last commit message	Last updated
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viewers	eta3421s2f: viewers · Ray	8d ago
eta3421s2f-etched.glb	Publish 0.1.0 · Ray	8d ago
eta3421s2f-etched.step	eta3421s2f: factory component page (tier=lcsc) · Ray	8d ago
eta3421s2f-hero.glb	eta3421s2f: hero GLB from the etched model (keeps the MPN mark) · Ray	8d ago
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eta3421s2f.step	Publish 0.1.0 · Ray	8d ago
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ETA3421S2F

etasolution · LED Drivers · SOT23-5

ETA3421S2F from etasolution, in a SOT23-5. 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	EN	input	Enable pin: drive high to enable the part and low to disable it, defaults to low when floating, and it doubles as the PWM dimming input at 20-100KHz.
2	GND	power_in	Ground return for the device.
3	SW	output	Inductor connection that drives the switching node, connected between SW and the regulator output; SW leakage is 5 µA max at VIN=5.5V with VSW=0 or 5.5V and EN=GND.
4	VIN	power_in	Supply voltage input over the 3.3V to 5.5V range, to be bypassed with a 10µF ceramic capacitor to GND.
5	FB	input	LED current feedback input: connect an external resistor from FB to GND to set ILED = 0.1/RS (A), with the FB regulation reference at 0.1V.

Key specifications

Parameter	Value
Manufacturer	etasolution
Package	SOT23-5
Category	LED Drivers
Pins	5

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Min	Typ	Max	Unit	Conditions	Page
VIN, EN, SW Voltage	-0.3		7.5	V		2
FB Voltage	-0.3		6	V		2
Operating Temperature Range	-40		85	°C		2
Storage Temperature Range	-55		150	°C		2
Input Voltage Range	3.3		5.5	V		2
Input UVLO Rising		2.35	2.45	V	Rising, Hysteresis=300mV	2
Input Supply Current		35	50	µA	VFB=0.65V, no switching	2
Input Shutdown Current		2	5	µA	VEN=0V	2
FB Input Current		0.01	1	µA	VFB=1V	2
PWM Dimming Frequency	20		100	KHz		2
Dimming Duty Cycle	30		100	%		2
EN Input Current		1	2	µA	VEN=5V	2
OVP Rising		7		V	Rising, Hysteresis=400mV	2
Thermal Shutdown		160		°C	Hysteresis=20°C	2
FB Voltage		0.1		V	3.3V≤VIN≤5.5V	2
Switching Frequency		1.5		MHz		2
PMOS Switch On Resistance		200		mΩ	ISW=200mA	2
NMOS Switch On Resistance		180		mΩ	ISW=200mA	2
High Side Current Limit		1.1		A		2
SW Leakage Current		5		µA	VIN=5.5V, VSW=0 or 5.5V, EN= GND	2
EN Logic High Threshold		1.2		V	Rising	2
EN Logic Low Threshold		0.4		V	Falling	2

CAD (KiCad official)

Symbol: ETA3421S2F
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT23-5 (KiCad packages3D, STEP)
3D model files: eta3421s2f-etched.step / eta3421s2f-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); eta3421s2f.step / eta3421s2f.glb are the bare package body.

Provenance

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

Datasheet: etasolution datasheet (9 pp, sha256 a935e4baaa0cfaa9, 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