VIPER37LDTR from STMicroelectronics, in a SOIC-16. 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	This pin is the device ground and the source of the power section.
2	GND	power_in	This pin is the device ground and the source of the power section.
3	N.C.	unconnected	Not connected.
4	N.A.	unconnected	Not available for user; it is mechanically connected to the controller die pad and is highly recommended to be connected to GND (pins 1-2) to improve noise immunity.
5	VDD	power_in	Supply voltage of the control section, which also provides the charging current of the external capacitor during start-up time.
6	CONT	bidirectional	Control pin for current limit set point adjustment (reduced by an external resistor to ground) and for output voltage monitoring, where a voltage exceeding VOVP shuts the IC down after strobed, digitally filtered sampling.
7	FB	input	Control input for duty cycle control; a voltage below VFBbm activates burst-mode operation and a level close to VFBlin approaches the cycle-by-cycle overcurrent set point.
8	BR	input	Brownout protection input with hysteresis; a voltage below VBRth shuts down (not latches) the device, and it can be connected to ground when not used.
9	N.C.	unconnected	Not connected.
10	N.C.	unconnected	Not connected.
11	N.C.	unconnected	Not connected.
12	N.C.	unconnected	Not connected.
13	DRAIN	passive	High voltage drain pin that also draws the built-in high voltage switched start-up bias current.
14	DRAIN	passive	High voltage drain pin that also draws the built-in high voltage switched start-up bias current.
15	DRAIN	passive	High voltage drain pin that also draws the built-in high voltage switched start-up bias current.
16	DRAIN	passive	High voltage drain pin that also draws the built-in high voltage switched start-up bias current.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOIC-16
Category	Power Management (PMIC)
Pins	16

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	VDRAIN			800	V		6
Repetitive avalanche energy	EAV			5	mJ	limited by TJ = 150 °C	6
Repetitive avalanche current	IAR			1.5	A	limited by TJ = 150 °C	6
Pulse drain current	IDRAIN			3	A		6
Control input pin voltage	VCONT	-0.3		6	V		6
Feedback voltage	VFB	-0.3		5.5	V		6
Brownout input pin voltage	VBR	-0.3		5	V		6
Supply voltage	VDD	-0.3			V	IDD = 25 mA; max printed as Self limited	6
Input current	IDD			25	mA		6
Power dissipation	PTOT			1.5	W	TA < 60 °C	6
Operating junction temperature range	TJ	-40		150	°C		6
Storage temperature	TSTG	-55		150	°C		6
Thermal resistance junction pin (SO16N)	RthJP			35	°C/W	Dissipated power = 1 W	6
Thermal resistance junction ambient (SO16N)	RthJA			110	°C/W	Dissipated power = 1 W	6
Thermal resistance junction ambient, FR4 100 mm2 Cu (SO16N)	RthJA			80	°C/W	Dissipated power = 1 W; standard single side FR4 board with 100 mm2 Cu (35 µm)	6
Breakdown voltage	VBVDSS	800			V	IDRAIN = 1 mA, VFB = GND, TJ = 25 °C	7
OFF state drain current	IOFF			60	μA	VDRAIN = max. rating, VFB = GND, TJ = 25 °C	7
Drain-source on state resistance	RDS(on)			4.5	Ω	IDRAIN = 0.4 A, VFB = 3 V, VBR = GND, TJ = 25 °C	7
Drain-source on state resistance	RDS(on)			9	Ω	IDRAIN = 0.4 A, VFB = 3 V, VBR = GND, TJ = 125 °C	7
Drain-source start voltage	VDRAIN_START	60	80	100	V		7
Startup charging current	IDDch	-2	-3	-4	mA	VDRAIN = 120 V, VBR = GND, VFB = GND, VDD = 4 V	7
Startup charging current after fault	IDDch	-0.4	-0.6	-0.8	mA	VDRAIN = 120 V, VBR = GND, VFB = GND, VDD = 5 V after fault	7
Operating voltage range	VDD	8.5		23.5	V	After turn-on	7
VDD clamp voltage	VDDclamp			23.5	V	IDD = 20 mA	7
VDD startup threshold	VDDon	13	14	15	V	VDRAIN = 120 V, VBR = GND, VFB = GND	7
VDD undervoltage shutdown threshold	VDDoff	7.5	8	8.5	V		7
VDD restart voltage threshold	VDD(RESTART)	4	4.5	5	V		7
Operating supply current, not switching	IDD0			0.9	mA	VFB = GND, FSW = 0 kHz, VBR = GND, VDD = 10 V	8
Operating supply current, switching	IDD1			2.5	mA	VDRAIN = 120 V, FSW = 60 kHz	8
Operating supply current, with protection tripping	IDD_FAULT			400	μA	VDD = 10 V	8
Operating supply current with VDD < VDD_OFF	IDD_OFF			270	μA	VDD = 7 V	8
Overload shutdown threshold	VFBolp	4.5	4.8	5.2	V		8
Linear dynamics upper limit	VFBlin	3.2	3.5	3.7	V		8
Burst mode threshold	VFBbm			0.6	V	Voltage falling	8
Burst mode hysteresis	VFBbmhys			100	mV	Voltage rising	8
Feedback sourced current	IFB	-150	-200	-280	μA	VFB = 0.3 V	8
Feedback sourced current	IFB			-3	μA	3.3 V < VFB < 4.8 V	8
Dynamic resistance	RFB(DYN)		14	21	kΩ	VFB < 3.3 V	8
ΔVFB / ΔID	HFB	0.5		2	V/A		8
Low level clamp voltage	VCONT_l			0.5	V	ICONT = -100 µA	8
High level clamp voltage	VCONT_h	5	5.5	6	V	ICONT = 1 mA	8
Max. drain current limitation	IDlim	0.95	1	1.05	A	VFB = 4 V, ICONT = -10 µA, TJ = 25 °C	8
Soft-start time	tSS			8.5	ms		8
Minimum turn-on time	TON_MIN	220	400	480	ns		8
Propagation delay	td			100	ns		8
Leading edge blanking	tLEB			300	ns		8
Peak drain current during burst mode	ID_BM			160	mA	VFB = 0.6 V	8

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		Note: The copper area for heat dissipation must be designed under the DRAIN pins.	5

CAD (KiCad official)

Symbol: VIPER37LDTR
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16 (KiCad packages3D, STEP)
3D model files: viper37ldtr-etched.step / viper37ldtr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); viper37ldtr.step / viper37ldtr.glb are the bare package body.

Provenance

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

Datasheet: STMicroelectronics datasheet (35 pp, sha256 18de52b1b5992ba6, retrieved 2026-11-05, 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

VIPER37LDTR

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3D Model

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