VIPER122LSTR from STMicroelectronics, in a SOP-10. 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	GND	power_in	Connected to the source of the internal power MOSFET and the controller ground reference.
2	VCC	power_in	Supply voltage of the control section, which provides the charging current of the external capacitor; operating voltage range is 11.5 V to 23.5 V.
3	NC	unconnected	Not connected; the pin must be left floating.
4	EA-OUT	output	Output of the error amplifier, with a saturation limit of 3 V typical and a maximum absolute voltage of 3.5 V.
5	EA-IN	input	Input of the error amplifier, with an absolute maximum pin voltage range of -0.3 V to 4.8 V.
6	DRAIN	passive	High voltage drain pin rated 730 V drain-to-source; the startup bias current is drawn from this pin and it should connect to a PCB copper area for heat dissipation.
7	DRAIN	passive	High voltage drain pin rated 730 V drain-to-source; the startup bias current is drawn from this pin and it should connect to a PCB copper area for heat dissipation.
8	DRAIN	passive	High voltage drain pin rated 730 V drain-to-source; the startup bias current is drawn from this pin and it should connect to a PCB copper area for heat dissipation.
9	DRAIN	passive	High voltage drain pin rated 730 V drain-to-source; the startup bias current is drawn from this pin and it should connect to a PCB copper area for heat dissipation.
10	DRAIN	passive	High voltage drain pin rated 730 V drain-to-source; the startup bias current is drawn from this pin and it should connect to a PCB copper area for heat dissipation.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOP-10
Category	Power Management (PMIC)
Pins	10

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Drain-to-source (ground) voltage	VDS			730	V		7
Pulse drain current	ID			2	A	limited by TJ = 150 °C	7
Input pin voltage	VEA-IN	-0.3		4.8	V		7
Out pin voltage	VEA-OUT	-0.3		3.5	V		7
Supply voltage	VCC	-0.3			V	max: Self limited	7
Input current	ICC			20	mA		7
Power dissipation	PTOT			1	W	TA < 50 °C	7
Junction temperature range	TJ	-40		150	°C		7
Storage temperature	TSTG	-55		150	°C		7
Thermal resistance junction to case (1)	RTH-JC			10	°C/W	Dissipated power = 1 W; standard single side FR4 board with minimum copper area	7
Thermal resistance junction ambient (1)	RTH-JA			155	°C/W	Dissipated power = 1 W; standard single side FR4 board with minimum copper area	7
Thermal resistance junction to case (2)	RTH-JC			5	°C/W	Dissipated power = 1 W; 100 mm2 (0.155 sq in) of Cu (35 μm thick)	7
Thermal resistance junction ambient (2)	RTH-JA			95	°C/W	Dissipated power = 1 W; 100 mm2 (0.155 sq in) of Cu (35 μm thick)	7
Breakdown voltage	VBVDSS	730			V	ID = 1 mA, EA-OUT = GND	9
Drain-source ON state resistance	RDS(on)			27	Ω	ID = 0.2 A; TJ = 25 °C	9
OFF state DRAIN leakage current	IDSS			70	μA	VDRAIN = 730 V	9
Drain-source start voltage	VSTART			45	V		9
Startup charging current	ICH1	-0.6		-1.8	mA	VDRAIN = 100 V; VCC = 4 V	9
Charging current during operation	ICH2	-7		-14	mA	VDRAIN = 100 V; VCC = 9 V falling edge	9
Operating voltage range	VCC	11.5		23.5	V		9
VCC clamp voltage	VCLAMP	23.5			V	ICC = 15 mA	9
VCC ON threshold	VON	12	13	14	V		9
VCC low value	VCCL	9.5	10.5	11.5	V		9
UVLO	VOFF	7	8	9	V		9
Operating supply current, not switching	ICC0			0.7	mA	Not switching	9
Operating supply current, switching	ICC1			1.6	mA	Switching	9
Operating supply current, with VCC < VOFF	ICC2			0.35	mA	VCC = 6 V	9
VCC clamp protection	ICC_FAIL	4			mA	VCC = VCLAMP; VEA-OUT = 3.3 V	9
Drain current limit (OCP)	ILIM	0.4	0.45	0.5	A	VEA-OUT = 3.3 V	9
Minimum turn ON time	TON(MIN)			450	ns		9
FOSC	FOSC	54	60	66	kHz		9
Modulation depth	FD	-4		4	kHz		9
Max. duty cycle	DMAX	70		80	%		9
E/A reference voltage	VREF	3.2	3.3	3.4	V		9
Burst mode threshold	VEA-BM	1	1.1	1.2	V		10
ΔVEA-OUT / ΔID	HEA-OUT	3		6	V/A		10
Thermal shutdown temperature (1)	TSD	150	160		°C		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		switched start-up bias current is drawn from this pin too. Connect to a PCB copper area to help heat	5

CAD (KiCad official)

Symbol: VIPER122LSTR
Footprint: Package_SO:SOIC-10_3.9x4.9mm_P1mm
3D model: SOP-10 (KiCad packages3D, STEP)
3D model files: viper122lstr-etched.step / viper122lstr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); viper122lstr.step / viper122lstr.glb are the bare package body.

Provenance

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

Datasheet: STMicroelectronics datasheet (21 pp, sha256 9b647f0feefa1735, retrieved 2026-11-06, 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

VIPER122LSTR

Verified VIPER122LSTR

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3D Model

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Schematic Symbol

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Datasheet

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