LT1521CMS8#PBF from Analog Devices, in a MSOP-8. 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	OUT	power_out	Regulator output supplying up to 300mA to the load, requiring a minimum output capacitor of 1.5µF to prevent oscillations.
2	ADJ	input	Error amplifier input on the adjustable LT1521 with a 3.75V reference, 50nA bias current flowing into the pin, internal clamps at 6V and -0.6V, and an output range of 3.75V to 20V.
3	NC	unconnected	No internal connection on the MS8 package.
4	GND	power_in	Ground pin of the MS8 package (the only ground lead on this package).
5	SHDN	input	Active-low shutdown input that turns the output off when pulled low, is internally clamped to 7V and -0.6V, can be left open to keep the device on, and has pull-up current limited to 5mA.
6	NC	unconnected	No internal connection on the MS8 package.
7	NC	unconnected	No internal connection on the MS8 package.
8	IN	power_in	Power input withstanding reverse voltages up to 20V (absolute maximum ±20V), to be bypassed with 1µF to 10µF if far from the main input filter capacitor.

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	MSOP-8
Category	Power Management ICs
Pins	8

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Regulated Output Voltage (ADJ pin tied to output)	VOUT	3.695	3.75	3.805	V	VIN = 4.3V, IOUT = 1mA, TJ = 25°C	3
Regulated Output Voltage (ADJ pin tied to output)	VOUT	3.64	3.75	3.86	V	4.8V < VIN < 20V, 1mA < IOUT < 300mA, over temperature	3
Line Regulation			1.5	20	mV	ΔVIN = 4.3 to 20V, IOUT = 1mA	3
Load Regulation			-20	-30	mV	ΔILOAD = 1mA to 300mA, TJ ≤ 25°C	3
Load Regulation			-20	-55	mV	ΔILOAD = 1mA to 300mA, TJ > 25°C	3
Dropout Voltage			130	170	mV	ILOAD = 1mA, TJ = 25°C	3
Dropout Voltage				250	mV	ILOAD = 1mA, over temperature	3
Dropout Voltage			290	350	mV	ILOAD = 50mA, TJ = 25°C	3
Dropout Voltage				450	mV	ILOAD = 50mA, over temperature	3
Dropout Voltage			350	420	mV	ILOAD = 100mA, TJ = 25°C	3
Dropout Voltage				550	mV	ILOAD = 100mA, over temperature	3
Dropout Voltage			400	470	mV	ILOAD = 150mA, TJ = 25°C	3
Dropout Voltage				600	mV	ILOAD = 150mA, over temperature	3
Dropout Voltage			500	600	mV	ILOAD = 300mA, TJ = 25°C	3
Dropout Voltage				750	mV	ILOAD = 300mA, over temperature	3
Ground Pin Current			12	25	µA	ILOAD = 0mA	3
Ground Pin Current			65	100	µA	ILOAD = 1mA	3
Ground Pin Current			300	450	µA	ILOAD = 10mA	3
Ground Pin Current			0.8	1.5	mA	ILOAD = 50mA	3
Ground Pin Current			1.4	2.5	mA	ILOAD = 100mA	3
Ground Pin Current			2.2	4	mA	ILOAD = 150mA	3
Ground Pin Current			6.5	12	mA	ILOAD = 300mA	3
Adjust Pin Bias Current			50	100	nA	TJ = 25°C	3
Shutdown Threshold (Off to On)			1.2	2.8	V	VOUT = Off to On	3
Shutdown Threshold (On to Off)			0.25	0.75	V	VOUT = On to Off	3
Shutdown Pin Current			2	5	µA	VSHDN = 0V	3
Quiescent Current in Shutdown			6	12	µA	VIN = VOUT (NOMINAL) + 1V, VSHDN = 0V	3
Ripple Rejection		50	58		dB	VIN, VOUT = 1V(Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 150mA	3
Current Limit			400	800	mA	VIN, VOUT = 7V, TJ = 25°C	3
Current Limit		320	400		mA	VIN = VOUT (NOMINAL) + 1.5V, ∆VOUT =, 0.1V	3
Input Reverse Leakage Current				1	mA	VIN =, 20V, VOUT = 0V	4
Reverse Output Current			5	10	µA	VOUT = 3.8V, VIN < 3.75V, TJ = 25°C	4
Input Voltage		-20		20	V		2
Output Pin Reverse Current				10	mA		2
Adjust Pin Current				10	mA		2
Shutdown Pin Input Voltage		-0.6		6.5	V		2
Shutdown Pin Input Current				5	mA		2
Storage Temperature Range		-65		150	°C		2
Operating Junction Temperature Range, Commercial		0		125	°C	Commercial	2
Lead Temperature (Soldering, 10 sec)				300	°C		2
Maximum Junction Temperature	TJMAX			125	°C	MS8 package	2
Thermal Resistance Junction-to-Ambient	θJA		125		°C/W	MS8 package	2
Thermal Resistance Junction-to-Ambient			110		°C/W	MS8, 2500mm2 topside copper, 2500mm2 backside, 2500mm2 board area	10
Thermal Resistance Junction-to-Ambient			130		°C/W	MS8, 100mm2 topside copper, 2500mm2 backside, 2500mm2 board area	10

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	copper		3/32" FR-4 board with one ounce copper. All NC leads were	10

CAD (KiCad official)

Symbol: LT1521CMS8#PBF
Footprint: Package_SO:MSOP-8_3x3mm_P0.65mm
3D model: MSOP-8 (KiCad packages3D, STEP)
3D model files: lt1521cms8-pbf-etched.step / lt1521cms8-pbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1521cms8-pbf.step / lt1521cms8-pbf.glb are the bare package body.

Provenance

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

Datasheet: Analog Devices datasheet (16 pp, sha256 a580c39ec72785d9, retrieved 2026-10-31, 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).

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LT1521CMS8#PBF

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