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LT1129CST-3.3#TRPBF

Analog Devices · Linear Voltage Regulators (LDO) · SOT-223-3

LT1129CST-3.3#TRPBF from Analog Devices, in a SOT-223-3. 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	The input pin supplies power to the device, with an absolute maximum input voltage of ±30V, and it withstands reverse voltages of 30V without reverse current flow.
2	GND	power_in	The ground pin (the SOT-223 tab is also GND) carries ground pin current of 50μA typical and 70μA maximum at no load, rising to 90μA maximum at 700mA load.
3	OUTPUT	power_out	The output pin supplies up to 700mA to the load and requires an output capacitor (3.3μF stable) to prevent oscillations.

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	SOT-223-3
Category	Power Management ICs
Pins	3

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	VOUT	3.25	3.3	3.35	V	VIN = 3.8V, IOUT = 1mA, TJ = 25°C	4
Regulated Output Voltage	VOUT	3.2	3.3	3.4	V	4.3V < VIN < 20V, 1mA < IOUT < 700mA, l (full operating temperature range)	4
Dropout Voltage	VDROPOUT		0.13	0.2	V	ILOAD = 10mA, TJ = 25°C	4
Dropout Voltage	VDROPOUT		0.13	0.25	V	ILOAD = 10mA, l	4
Dropout Voltage	VDROPOUT		0.25	0.35	V	ILOAD = 100mA, TJ = 25°C	4
Dropout Voltage	VDROPOUT		0.25	0.45	V	ILOAD = 100mA, l	4
Dropout Voltage	VDROPOUT		0.37	0.45	V	ILOAD = 500mA, TJ = 25°C	4
Dropout Voltage	VDROPOUT		0.37	0.6	V	ILOAD = 500mA, l	4
Dropout Voltage	VDROPOUT		0.45	0.55	V	ILOAD = 700mA, TJ = 25°C	4
Dropout Voltage	VDROPOUT		0.45	0.7	V	ILOAD = 700mA, l	4
Ground Pin Current	IGND		50	70	μA	ILOAD = 0mA, l	4
Ground Pin Current	IGND		310	450	μA	ILOAD = 10mA, l	4
Ground Pin Current	IGND		2	3.5	mA	ILOAD = 100mA, l	4
Ground Pin Current	IGND		10	20	mA	ILOAD = 300mA, l	4
Ground Pin Current	IGND		25	45	mA	ILOAD = 500mA, l	4
Ground Pin Current	IGND		50	90	mA	ILOAD = 700mA, l	4
Shutdown Threshold (Off to On)	VSHDN	0.25		1.2	V	VOUT = Off to On, l	4
Shutdown Threshold (On to Off)	VSHDN	0.75		2.8	V	VOUT = On to Off, l	4
Shutdown Pin Current	ISHDN		6	10	μA	VSHDN = 0V, l	4
Quiescent Current in Shutdown	IQ(SHDN)		15	25	μA	VIN = 6V, VSHDN = 0V, l	4
Line Regulation			1.5	10	mV	ΔVIN = 4.8V to 20V, IOUT = 1mA, l	4
Load Regulation			6	15	mV	ΔILOAD = 1mA to 700mA, TJ = 25°C	4
Load Regulation			20	30	mV	ΔILOAD = 1mA to 700mA, l	4
Ripple Rejection	RR	52	64		dB	VIN, VOUT = 1V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 0.7A, TJ = 25°C	5
Current Limit	ILIM	1.2		1.6	A	VIN, VOUT = 7V, TJ = 25°C	5
Input Reverse Leakage Current	IIN(REV)			1	mA	VIN = -20V, VOUT = 0V, l	5
Reverse Output Current (LT1129-3.3)	IOUT(REV)		16	25	μA	VOUT = 3.3V, VIN = 0V	5
Input Voltage	VIN			30	V	Absolute maximum rating; ± 30V printed, contact factory for higher	2
Output Pin Reverse Current	IOUT(REV)			10	mA	Absolute maximum rating	2
Sense Pin Current	ISENSE			10	mA	Absolute maximum rating	2
Shutdown Pin Input Voltage	VSHDN	-0.6		6.5	V	Absolute maximum rating, Note 2	2
Shutdown Pin Input Current	ISHDN			20	mA	Absolute maximum rating, Note 2	2
Storage Temperature Range	TSTG	-65		150	°C	Absolute maximum rating	2
Operating Junction Temperature Range (LT1129C-X)	TJ	0		125	°C	LT1129C-X, Note 3	2
Thermal Resistance Junction-to-Ambient (ST package)	θJA		50		°C/W	ST package, 3-Lead SOT-223, as printed in pin configuration	2
Thermal Resistance Junction-to-Ambient (ST package, 2500 sq. mm topside copper)	θJA			45	°C/W	Table 2, topside 2500 sq. mm, backside 2500 sq. mm, board 2500 sq. mm	11
Thermal Resistance Junction-to-Ambient (ST package, 100 sq. mm topside copper)	θJA			59	°C/W	Table 2, topside 100 sq. mm, backside 2500 sq. mm, board 2500 sq. mm	11

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		Table 1. Q Package, 5-Lead DD COPPER AREA THERMAL RESISTANCE	11

CAD (KiCad official)

Symbol: LT1129CST-3.3#TRPBF
Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
3D model: SOT-223-3 (KiCad packages3D, STEP)
3D model files: lt1129cst-3-3-trpbf-etched.step / lt1129cst-3-3-trpbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lt1129cst-3-3-trpbf.step / lt1129cst-3-3-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 3bd8354699849a4f, retrieved 2026-10-28, 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).

Datasheet PDF