component
VIPER35LD
Public Made by Adomby adom
STMicroelectronics AC-DC Controllers And Regulators, SO-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownVIPER35LD
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);viper35ld.step/viper35ld.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).