LT1961EMS8E#TRPBF from Analog Devices, in a MSOP-8-EP. 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	VIN	power_in	This pin powers the internal circuitry and internal regulator, and the external bypass capacitor should be kept close to it.
2	SW	output	The switch pin is the collector of the on-chip 1.5A power NPN switch, which carries large currents, so its traces to the switching components should be kept as short as possible.
3	GND	power_in	This pin is the reference for the regulated output and should be shorted to GND pin 4 and the exposed pad on the PCB.
4	GND	power_in	This pin is the reference for the regulated output and should be shorted to GND pin 3 and the exposed pad on the PCB.
5	SHDN	input	The shutdown pin turns the regulator off using a 1.35V threshold, reducing input drain current to a few microamperes, and must be floated or pulled high to operate.
6	FB	input	The feedback pin sets the output voltage through an external divider that generates 1.2V at the pin, and an impedance below 5kΩ is needed for current-limit foldback during startup when FB is below 0.5V.
7	VC	passive	The VC pin is the error amplifier output used for frequency compensation, sitting at about 0.3V for very light loads and 0.9V at maximum load.
8	SYNC	input	The sync pin synchronizes the internal oscillator to an external logic signal with a 20% to 80% duty cycle over a range up to 2MHz, and should be grounded when not in use.
9	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	MSOP-8-EP
Category	Power Management ICs
Pins	9

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Recommended Operating Voltage		3		25	V		2
Maximum Switch Current Limit		1.5	2	3	A		2
Oscillator Frequency		1		1.5	MHz	3.3V < VIN < 25V	2
Switch On Voltage Drop			310	500	mV	ISW = 1.5A	2
VIN Undervoltage Lockout		2.47	2.6	2.73	V	(Note 3)	2
VIN Supply Current			0.9	1.3	mA	ISW = 0A	2
VIN Supply Current/ISW			27		mA/A	ISW = 1.5A	2
Shutdown Supply Current			6	20	μA	VSHDN = 0V, VIN = 25V, VSW = 25V	2
Shutdown Supply Current (full temperature range)				45	μA		2
Feedback Voltage		1.182	1.2	1.218	V	3V < VIN < 25V, 0.4V < VC < 0.9V	2
Feedback Voltage (full temperature range)		1.176		1.224	V		2
FB Input Current		0	-0.2	-0.4	μA		3
FB to VC Voltage Gain		150		350		0.4V < VC < 0.9V	3
FB to VC Transconductance		500	850	1300	μMho	ΔIVC = ±10μA	3
VC Pin Source Current		-165	-120	-85	μA	VFB = 1V	3
VC Pin Sink Current		70	110	165	μA	VFB = 1.4V	3
VC Pin to Switch Current Transconductance			2.4		A/V		3
VC Pin Minimum Switching Threshold			0.3		V	Duty Cycle = 0%	3
VC Pin 1.5A ISW Threshold			0.9		V		3
Maximum Switch Duty Cycle		80	90		%	VC = 1.2V, ISW = 100mA	3
Maximum Switch Duty Cycle		75	80		%	VC = 1.2V, ISW = 1A, 25°C ≤ TA ≤ 125°C	3
Maximum Switch Duty Cycle		70	75		%	VC = 1.2V, ISW = 1A, TA ≤ 25°C	3
SHDN Threshold Voltage		1.28	1.35	1.42	V		3
SHDN Input Current (Shutting Down)		-7	-10	-13	μA	SHDN = 60mV Above Threshold	3
SHDN Threshold Current Hysteresis		4	7	10	μA	SHDN = 100mV Below Threshold	3
SYNC Threshold Voltage		1.5		2.2	V		3
SYNC Input Frequency		1.5		2	MHz		3
SYNC Pin Resistance			20		kΩ	ISYNC = 1mA	3
Input Voltage				25	V		2
Switch Voltage				35	V		2
SHDN Pin				25	V		2
FB Pin Current				1	mA		2
SYNC Pin Current				1	mA		2
Operating Junction Temperature Range (LT1961E, LT1961I)	TJ	-40		125	°C		2
Storage Temperature Range		-65		150	°C		2
Lead Temperature (Soldering, 10 sec)				300	°C	10 sec soldering	2
Thermal Resistance Junction to Ambient	θJA		50		°C/W	Ground pad connected to large copper area	2

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		the path between the input bypass and the GND pins short. The exposed pad should be attached to a large copper area	5

CAD (KiCad official)

Symbol: LT1961EMS8E#TRPBF
Footprint: Package_SO:MSOP-8-1EP_3x3mm_P0.65mm_EP1.5x1.8mm
3D model: MSOP-8-EP (KiCad packages3D, STEP)
3D model files: lt1961ems8e-trpbf-etched.step / lt1961ems8e-trpbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1961ems8e-trpbf.step / lt1961ems8e-trpbf.glb are the bare package body.

Provenance

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

Datasheet: Analog Devices datasheet (16 pp, sha256 81fb93bdc39714ee, retrieved 2026-10-30, tier: manufacturer)
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).

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LT1961EMS8E#TRPBF

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3D Model

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