MCP1623T-I from Microchip Tech, 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	SW	passive	Switch node and boost inductor input, where the internal N-channel switch drain and P-channel switch source join, carrying inductor current up to 425 mA peak.
2	GND	power_in	Circuit ground return, with traces from the input cap return, output cap return and this pin kept as short as possible to minimize noise.
3	EN	input	Logic-level enable input: above 90% of VIN enables the regulator output, below 20% of VIN disables it and lowers quiescent current.
4	FB	input	Feedback input for the external resistor divider that regulates the output voltage, at 1.21V typical when in regulation.
5	VOUT	power_out	Output voltage pin connecting the integrated P-channel MOSFET to the output capacitor, which also connects to the FB voltage divider.
6	VIN	power_in	Input voltage source connection, to be decoupled to GND with a 4.7 µF minimum capacitor.

Key specifications

Parameter	Value
Manufacturer	Microchip Tech
Package	SOT-23-6
Category	Power Management ICs
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
Feedback Voltage	VFB	1.12	1.21	1.299	V		3
Output Voltage Adjust Range	VOUT	2		5.5	V	Note 2	3
Minimum Start-Up Voltage	VIN		0.65	0.8	V	Note 1	3
Maximum Output Current	IOUT	50			mA	1.5V VIN, 3.3V VOUT	3
Quiescent Current - PFM mode	IQPFM		19	30	µA	Measured at VOUT = 4.0V; EN = VIN, IOUT = 0 mA (Note 3)	3
Quiescent Current - Shutdown	IQSHDN		0.7	2.3	µA	VOUT = EN = GND; Includes N-Channel and P-Channel switch leakage	3
NMOS Peak Switch Current Limit	IN(MAX)	300	425		mA	Note 4	4
VOUT Accuracy	VOUT%	-7.4		7.4	%	Includes line and load regulation; VIN = 1.5V, IOUT = 50 mA	4
Switching Frequency	fSW	370	500	630	kHz		4
EN Input Logic High	VIH	90			%of VIN	IOUT = 1 mA	4
EN Input Logic Low	VIL			20	%of VIN	IOUT = 1 mA	4
Operating Junction Temperature Range	TJ	-40		125	°C	Steady state	4
Maximum Junction Temperature	TJ			150	°C	Transient	4
Storage Temperature	TA	-65		150	°C		3
Ambient Temperature with Power Applied		-40		85	°C		3
Input/Output Pin Voltage (EN, FB, VIN, VSW, VOUT to GND)				6.5	V		3
ESD Protection HBM				3	kV		3
ESD Protection MM				300	V		3
Thermal Resistance, 6LD-SOT-23	JA		190.5		°C/W		4

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part	Material	Colour / plating	Datasheet says	Page
contacts		gold	MC = Plastic Dual Flat, No Lead (2x3 DFN), 8-lead Y* = Nickel palladium gold manufacturing designator.	27

CAD (KiCad official)

Symbol: MCP1623T-I
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)
3D model files: mcp1623t-i-etched.step / mcp1623t-i-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); mcp1623t-i.step / mcp1623t-i.glb are the bare package body.

Provenance

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

Datasheet: Microchip Tech datasheet (30 pp, sha256 a719e8d546d9c19e, retrieved 2026-11-07, tier: manufacturer)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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

MCP1623T-I

Verified MCP1623T-I

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3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README