component
VIPER35HDTR
Public Made by Adomby adom
STMicroelectronics AC-DC Controllers & Regulators, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
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"slug": "viper35hdtr",
"title": "VIPER35HDTR",
"brief": "STMicroelectronics AC-DC Controllers & Regulators, SOIC-16. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
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"power management ics",
"viper35hdtr",
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"component": {
"mpn": "VIPER35HDTR",
"manufacturer": "STMicroelectronics",
"package": "SOIC-16",
"pin_count": 16,
"category": "Power Management ICs",
"subcategory": "AC-DC Controllers & Regulators",
"datasheet": "https://www.st.com/resource/en/datasheet/viper35hdtr.pdf",
"parts": {
"symbol": "viper35hdtr.kicad_sym",
"footprint": "viper35hdtr.kicad_mod",
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"model_3d_step": "viper35hdtr-etched.step",
"model_3d_step_plain": "viper35hdtr.step",
"lbr": "viper35hdtr.lbr"
},
"distributor_links": {
"lcsc": "C2970727",
"digikey": "497-VIPER35HDTR-ND",
"mouser": "511-VIPER35HDTR"
},
"distributor_check": {
"checked_at": "2026-10-30T18:57:02Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "497-VIPER35HDTR-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "511-VIPER35HDTR",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "GND",
"type": "power_in",
"description": "Device ground and source of the power MOSFET."
},
{
"number": "2",
"name": "GND",
"type": "power_in",
"description": "Device ground and source of the power MOSFET."
},
{
"number": "3",
"name": "N.C.",
"type": "unconnected",
"description": "Not internally connected; it can be connected to GND."
},
{
"number": "4",
"name": "N.A.",
"type": "passive",
"description": "Not available for user; it is mechanically connected to the controller die pad of the frame and should be connected to GND (pins 1, 2) to improve noise immunity."
},
{
"number": "5",
"name": "VDD",
"type": "power_in",
"description": "Supply voltage of the control section that provides the charging current of the external capacitor during power-up; the absolute maximum VDD is self-limited and the input current IDD is rated at 25 mA."
},
{
"number": "6",
"name": "ZCD",
"type": "input",
"description": "Multifunction pin providing zero-current detection for quasi-resonant operation, drain current limit (IDlim) setup via RLIM, feed-forward compensation setup via RFF, and output overvoltage protection setup via the ROVP/RLIM divider; the input pin voltage is self-limited with IZCD = 1 mA."
},
{
"number": "7",
"name": "FB",
"type": "input",
"description": "Control input for duty cycle control, where a voltage below VFBbm activates burst-mode operation and a level close to VFBlin means the cycle-by-cycle overcurrent set-point is close; the absolute input voltage range is -0.3 V to 5.5 V."
},
{
"number": "8",
"name": "BR",
"type": "input",
"description": "Brown-out protection input with hysteresis that shuts down (does not latch) the device when below VBRth and restarts when the voltage exceeds VBRth + VBRhyst; it must be connected to ground when not used."
},
{
"number": "9",
"name": "N.C.",
"type": "unconnected",
"description": "Not internally connected; must be left floating to get a safe clearance distance."
},
{
"number": "10",
"name": "N.C.",
"type": "unconnected",
"description": "Not internally connected; must be left floating to get a safe clearance distance."
},
{
"number": "11",
"name": "N.C.",
"type": "unconnected",
"description": "Not internally connected; must be left floating to get a safe clearance distance."
},
{
"number": "12",
"name": "N.C.",
"type": "unconnected",
"description": "Not internally connected; must be left floating to get a safe clearance distance."
},
{
"number": "13",
"name": "DRAIN",
"type": "passive",
"description": "High voltage drain pin rated for 800 V drain-to-source (ground); the built-in high voltage start-up bias current is drawn from this pin, and it is connected to the metal frame to facilitate heat dissipation."
},
{
"number": "14",
"name": "DRAIN",
"type": "passive",
"description": "High voltage drain pin rated for 800 V drain-to-source (ground); the built-in high voltage start-up bias current is drawn from this pin, and it is connected to the metal frame to facilitate heat dissipation."
},
{
"number": "15",
"name": "DRAIN",
"type": "passive",
"description": "High voltage drain pin rated for 800 V drain-to-source (ground); the built-in high voltage start-up bias current is drawn from this pin, and it is connected to the metal frame to facilitate heat dissipation."
},
{
"number": "16",
"name": "DRAIN",
"type": "passive",
"description": "High voltage drain pin rated for 800 V drain-to-source (ground); the built-in high voltage start-up bias current is drawn from this pin, and it is connected to the metal frame to facilitate heat dissipation."
}
],
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"primary_model": "claude-haiku-5-5",
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"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Pin 4 (N.A.) is labelled 'Not available for user' but the datasheet recommends connecting it to GND;; The datasheet does not give an ERC class for DRAIN; passive was chosen because it is the MOSFET drai; ZCD, FB and BR are typed as input based on the function descriptions. The datasheet does not state t"
],
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"cost_usd": 0.0715,
"at": "2026-10-30T18:56:51"
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"sha256": "99aabfeaadc8ea2d",
"source_tier": "mfr"
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"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
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"described": 16,
"cites_pages": true,
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}
},
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"centre_offset_mm": 0,
"footprint_binding": "identity",
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{
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],
"package_dims": {
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"source_page": 39,
"D": {
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9.8,
10
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"Package": "SOIC-16",
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"quote": "Note: The copper area for heat dissipation has to be designed under the DRAIN pins.",
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"material": "copper"
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{
"name": "Drain-to-source (ground) voltage",
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{
"name": "Repetitive avalanche energy",
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{
"name": "Single pulse drain current",
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"unit": "A",
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{
"name": "Input pin voltage (ZCD)",
"symbol": "VZCD",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "with IZCD = 1 mA; max self limited",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Input pin voltage (FB)",
"symbol": "VFB",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 8,
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},
{
"name": "Input pin voltage (BR)",
"symbol": "VBR",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "with IBR = 0.25 mA; max self limited",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Supply voltage",
"symbol": "VDD",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": null,
"conditions": "max self limited",
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{
"name": "Input current",
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"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 25,
"conditions": "",
"source_page": 8,
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{
"name": "Power dissipation",
"symbol": "PTOT",
"kind": "absolute_maximum",
"unit": "W",
"min": null,
"typ": null,
"max": 1.5,
"conditions": "TA < 60 °C",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Operating junction temperature range",
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"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
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{
"name": "Storage temperature",
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"min": -55,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Thermal resistance junction to pin (SO16N)",
"symbol": "RthJP",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": null,
"max": 35,
"conditions": "dissipated power = 1 W",
"source_page": 8,
"source": "datasheet"
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{
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"max": 110,
"conditions": "dissipated power = 1 W",
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{
"name": "Thermal resistance junction to ambient, FR4 100 mm2 Cu (SO16N)",
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"min": null,
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"conditions": "dissipated power = 1 W; standard single side FR4 board, 100 mm2 Cu (footnote 1)",
"source_page": 8,
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{
"name": "Off-state drain current",
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"conditions": "VDRAIN = 800 V, VFB = GND, TJ = 25 °C",
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{
"name": "Drain-source on-state resistance",
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"conditions": "IDRAIN = 0.4 A, VFB = 3 V, VBR = GND, TJ = 25 °C",
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{
"name": "Start-up charging current (power-up)",
"symbol": "IDDch1",
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"min": -2,
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"conditions": "VDRAIN = 120 V, VBR = GND, VFB = GND, VDD = 4 V",
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{
"name": "Start-up charging current (auto-restart)",
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"min": -0.4,
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"conditions": "VDRAIN = 120 V, VBR = GND, VFB = GND, VDD = 5 V, after fault",
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{
"name": "Operating voltage range",
"symbol": "VDD",
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"min": 8.5,
"typ": null,
"max": 23.5,
"conditions": "After turn-on",
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},
{
"name": "VDD start-up threshold",
"symbol": "VDDon",
"kind": "electrical",
"unit": "V",
"min": 13,
"typ": 14,
"max": 15,
"conditions": "VDRAIN = 120 V, VBR = GND, VFB = GND",
"source_page": 9,
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},
{
"name": "VDD undervoltage shutdown threshold",
"symbol": "VDDoff",
"kind": "electrical",
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"min": 7.5,
"typ": 8,
"max": 8.5,
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{
"name": "VDD restart voltage threshold",
"symbol": "VDD(RESTART)",
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"min": 4,
"typ": 4.5,
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{
"name": "Overvoltage threshold",
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{
"name": "Internal frequency limit (H type)",
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"min": 200,
"typ": 225,
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"conditions": "VIPER35H",
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{
"name": "Brown-out threshold",
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"unit": "A",
"min": 0.41,
"typ": 0.45,
"max": 0.49,
"conditions": "Voltage falling",
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{
"name": "Brown-out voltage hysteresis above VBRth",
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"min": 40,
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{
"name": "Brown-out disable voltage",
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{
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"conditions": "IDRAIN = 1 mA, VFB = GND, TJ = 25 °C",
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{
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{
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"conditions": "IDD = 20 mA",
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{
"name": "Thermal shutdown hysteresis",
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"source": "datasheet"
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