LTC2909ITS8-3.3#TRPBF from Analog Devices, in a TSOT-23-8. 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	ADJ1	input	Adjustable monitor input with a 0.5V threshold (VRT 0.4925V to 0.5075V), an input current of at most ±15nA at 0.55V, and an absolute maximum terminal voltage of -0.3V to 7.5V.
2	ADJ2	input	Second adjustable monitor input with a 0.5V threshold (VRT 0.4925V to 0.5075V), an input current of at most ±15nA at 0.55V, and an absolute maximum terminal voltage of -0.3V to 7.5V.
3	REF	output	Buffered 1V reference output (0.985V to 1.015V) for negative-supply offset, valid when VCC is above 2.175V, with a terminal current limit of ±1mA.
4	GND	power_in	Ground reference for all device voltages.
5	RST	output	Open-drain active-low reset output, with VOL of 0.15V max at VCC=1V and 100µA and 0.30V max at VCC=3V and 2.5mA, high-level leakage of ±1µA max, and an absolute maximum of 7.5V.
6	VCC	power_in	Supply input monitored by the UVLO threshold (2.175V to 2.250V for the -2.5 part, 2.871V to 2.970V for the -3.3 part, 4.350V to 4.500V for the -5 part), with an absolute maximum of 6V and a 6.5V internal shunt regulator; supplies above 6V require a series dropping resistor.
7	TMR	passive	Reset timeout programming pin: tying it to GND selects the internal 200ms (typ) timeout, a capacitor sets an external timeout (20ms typ at 2.2nF), and tying it to VCC disables the timer, with an absolute maximum of VCC+0.3V and pull-up/pull-down currents of about 2.1µA.
8	SEL	input	Three-state input that sets each ADJ input polarity: below 0.4V for GND, above 1.4V for VCC, and left open for mixed polarity (about 0.9V), with an absolute maximum of 7.5V and input current of ±25µA.

Key specifications

Parameter	Value
Manufacturer	Analog Devices
Package	TSOT-23-8
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
Operating Supply Voltage (RST in correct state)	VCC(MIN)	0.5			V	RST in correct state	3
VCC Shunt Regulation Voltage	VCC(SHUNT)	6	6.5	6.9	V	IVCC = 1mA, IVREF = 0	3
VCC Input Current	ICC		50	150	μA	2.175 < VCC < 6V	3
ADJ Input Threshold	VRT	0.4925	0.5	0.5075	V		3
ADJ Hysteresis	ΔVRT	1.5	3.5	10	mV	TMR = VCC	3
ADJ Input Current	IADJ	-15		15	nA	VADJ = 0.55V	3
VCC UVLO Threshold (LTC2909-3.3)	VCC(UVLO)	2.871	2.921	2.97	V	LTC2909-3.3	3
UVLO Hysteresis	ΔVCC(UVLO)	0.3	0.7	2	%	TMR = VCC	3
Buffered Reference Voltage	VREF	0.985	1	1.015	V	VCC > 2.175V, IVREF = ±1mA	3
TMR Pull-Up Current	ITMR(UP)	-1.5	-2.1	-2.7	μA	VTMR = 1V	3
TMR Pull-Down Current	ITMR(DOWN)	1.5	2.1	2.7	μA	VTMR = 1V	3
Reset Timeout Period, External	tRST(EXT)	16	20	25	ms	CTMR = 2.2nF	3
Reset Timeout Period, Internal	tRST(INT)	150	200	260	ms	VTMR = 0V	3
Timer Disable Voltage, VTMR Rising (offset from VCC)	VTMR(DIS)	-0.36	-0.25	-0.16	V	Printed as VCC, 0.36 / VCC, 0.25 / VCC, 0.16; VTMR rising	3
Timer Disable Hysteresis	ΔVTMR(DIS)	60	110	150	mV	VTMR falling	3
Timer Internal Mode Voltage	VTMR(INT)	0.14	0.21	0.27	V	VTMR falling	3
Timer Internal Mode Hysteresis	ΔVTMR(INT)	40	70	110	mV	VTMR rising	3
ADJx Comparator Propagation Delay to RST	tPROP	50	150	500	μs	ADJx driven beyond reset threshold (VRTX) by 5mV	3
VCC Undervoltage Detect to RST	tUV	50	150	500	μs	VCC less than UVLO threshold (VCC(UVLO)) by 1%	3
RST Output Voltage Low	VOL(RST)		0.01	0.15	V	VCC = 0.5V, I = 5μA	3
RST Output Voltage Low	VOL(RST)		0.1	0.3	V	VCC = 3V, I = 2500μA	3
RST Output Voltage High Leakage	IOH(RST)	-1		1	μA	RST = VCC	3
SEL Low Level Input Voltage	VIL			0.4	V		3
SEL High Level Input Voltage	VIH	1.4			V		3
Allowable Leakage in Open State (first printed value)	ISEL(Z)	-5		5	μA		3
Allowable Leakage in Open State (second printed value)	ISEL(Z)	-10		10	μA		3
SEL Input Current	ISEL	-25		25	μA	SEL = VCC or SEL = GND	3
VCC Supply Voltage Absolute Maximum	VCC	-0.3		6	V		2
SEL, RST Terminal Voltage	SEL, RST	-0.3		7.5	V		2
ADJ1, ADJ2 Terminal Voltage	ADJ1, ADJ2	-0.3		7.5	V		2
TMR Terminal Voltage	TMR	-0.3			V	Maximum printed as VCC + 0.3V	2
VCC Terminal Current	IVCC	-10		10	mA		2
REF Terminal Current	IREF	-1		1	mA		2
Storage Temperature Range (TSOT-23)		-65		150	°C	TSOT-23 package	2
Lead Temperature (Soldering, 10 sec) (TSOT-23)				300	°C	TSOT-23, 10 sec soldering	2
Operating Temperature Range (LTC2909I)		-40		85	°C	LTC2909I grade	2
Maximum Junction Temperature	TJMAX			125	°C	TS8 package	2
Thermal Resistance, Junction to Ambient	θJA		250		°C/W	TS8 package	2

CAD (KiCad official)

Symbol: LTC2909ITS8-3.3#TRPBF
Footprint: Package_TO_SOT_SMD:TSOT-23-8
3D model: TSOT-23-8 (KiCad packages3D, STEP)
3D model files: ltc2909its8-3-3-trpbf-etched.step / ltc2909its8-3-3-trpbf-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); ltc2909its8-3-3-trpbf.step / ltc2909its8-3-3-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 35475090990f5abb, 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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LTC2909ITS8-3.3#TRPBF

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3D Model

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Schematic Symbol

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