component

VIPER35LD

Public Made by Adom

by adom

STMicroelectronics AC-DC Controllers And Regulators, SO-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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VIPER35LD

STMicroelectronics · AC-DC Controllers And Regulators · SO-16

VIPER35LD from STMicroelectronics, in a SO-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 Device ground and source of the power MOSFET.
2 GND power_in Device ground and source of the power MOSFET.
3 N.C. unconnected Not internally connected; it can be connected to GND.
4 N.A. passive Not available for user; mechanically connected to the controller die pad and should be connected to GND (pins 1, 2) to improve noise immunity.
5 VDD power_in Supply voltage of the control section; this pin provides the charging current of the external capacitor during power-up.
6 ZCD input Multifunction pin used for zero-current detection for quasi-resonant operation, drain current limit (IDlim) setup, feed-forward compensation (RFF) setup, and output overvoltage protection (ROVP/RLIM) setup.
7 FB input Control input for duty cycle control; a voltage below threshold VFBbm activates burst-mode operation and a level close to VFBlin means the cycle-by-cycle overcurrent setpoint is close.
8 BR input Brown-out protection input with hysteresis; a voltage below VBRth shuts down (not latch) the device, which restarts when the voltage exceeds VBRth + VBRhyst, and it must be connected to ground when not used.
9 N.C. unconnected Not internally connected; must be left floating to get a safe clearance distance.
10 N.C. unconnected Not internally connected; must be left floating to get a safe clearance distance.
11 N.C. unconnected Not internally connected; must be left floating to get a safe clearance distance.
12 N.C. unconnected Not internally connected; must be left floating to get a safe clearance distance.
13 DRAIN passive High voltage drain pin from which the built-in high voltage switched start-up bias current is drawn; pins connected to the metal frame help heat dissipation.
14 DRAIN passive High voltage drain pin from which the built-in high voltage switched start-up bias current is drawn; pins connected to the metal frame help heat dissipation.
15 DRAIN passive High voltage drain pin from which the built-in high voltage switched start-up bias current is drawn; pins connected to the metal frame help heat dissipation.
16 DRAIN passive High voltage drain pin from which the built-in high voltage switched start-up bias current is drawn; pins connected to the metal frame help heat dissipation.

Key specifications

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

CAD (KiCad official)

  • Symbol: VIPER35LD
  • Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
  • 3D model: SO-16 (KiCad packages3D, STEP)
  • 3D model files: viper35ld-etched.step / viper35ld-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); viper35ld.step / viper35ld.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (38 pp, sha256 e4cfc539b430a68d, retrieved 2026-10-10, tier: lcsc)
  • 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