component
SY58873UFAC
Public Made by Adomby adom
Silergy Corp AC-DC Controllers And Regulators, SO-8. 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
markdownSY58873UFAC
Silergy Corp · AC-DC Controllers And Regulators · SO-8
SY58873UFAC from Silergy Corp, in a SO-8. 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 | CS | passive | Peak current limit set pin, which also carries the internal GM error amplifier output; the datasheet gives a CS limit of 550 mV (max) and an absolute maximum rating of -0.3 V to 3.6 V. |
| 2 | FB | input | Voltage feedback pin connected to a resistor divider that senses the boost output; the reference voltage is 1.229 V typ (1.211 V to 1.247 V) and the internal OVP threshold is 1.397 V typ (1.326 V to 1.468 V), with an absolute maximum rating of -0.3 V to 3.6 V. |
| 3 | GND | power_in | Ground pin for the device. |
| 4 | VCC | power_in | Power supply pin with a turn-on threshold of 12.9 V to 14.9 V, a turn-off threshold of 6.6 V to 8 V, a shunt voltage of 13.7 V to 15.6 V, and an absolute maximum rating of -0.3 V to 20 V. |
| 5 | LX | passive | Internal high-voltage MOSFET drain pin, rated for a breakdown voltage of 520 V. |
| 6 | LX | passive | Internal high-voltage MOSFET drain pin, rated for a breakdown voltage of 520 V. |
| 7 | LX | passive | Internal high-voltage MOSFET drain pin, rated for a breakdown voltage of 520 V. |
| 8 | LX | passive | Internal high-voltage MOSFET drain pin, rated for a breakdown voltage of 520 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Silergy Corp |
| Package | SO-8 |
| Category | Power Management (PMIC) |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VCC Turn-on Threshold | VVCC_ON | 12.9 | 13.9 | 14.9 | V | 4 | |
| VCC Turn-off Threshold | VVCC_OFF | 6.6 | 7.3 | 8 | V | 4 | |
| VCC Shunt Voltage | VVCC_SHUNT | 13.7 | 14.65 | 15.6 | V | IVCC=2mA | 4 |
| Start up Current | IST | 49 | 57 | 65 | µA | VVCC=12V | 4 |
| Quiescent Current | IQ | 230 | 265 | 300 | µA | 4 | |
| Reference Voltage for Feedback | VREF | 1.211 | 1.229 | 1.247 | V | 4 | |
| Internal OVP Voltage Threshold | VREF_OVP | 1.326 | 1.397 | 1.468 | V | 4 | |
| Rdson of HV MOSFET | RDSON | 4.4 | 5.5 | Ω | 4 | ||
| CS Limit | VCS_LIMIT | 550 | mV | 4 | |||
| Min ON Time | TON_MIN | 670 | ns | 4 | |||
| Max ON Time | TON_MAX | 12.5 | µs | 4 | |||
| Min OFF Time | TOFF_MIN | 2 | µs | 4 | |||
| Max OFF Time | TOFF_MAX | 54 | µs | 4 | |||
| BV of HV MOSFET | VBV | 520 | V | 4 | |||
| Thermal Shut Down Temperature | TSD | 160 | ºC | 4 | |||
| CS pin voltage | CS | -0.3 | 3.6 | V | 3 | ||
| FB pin voltage | FB | -0.3 | 3.6 | V | 3 | ||
| VCC pin voltage | VCC | -0.3 | 20 | V | 3 | ||
| LX pin voltage | LX | 520 | V | 3 | |||
| Power Dissipation | 1.1 | W | @ TA = 25°C, SO8 | 3 | |||
| Maximum Junction Temperature | 165 | °C | 3 | ||||
| Lead Temperature (Soldering, 10 sec.) | 260 | °C | 10 sec. soldering | 3 | |||
| Storage Temperature Range | -65 | 150 | °C | 3 | |||
| Package Thermal Resistance, junction-to-ambient | θJA | 88 | °C/W | SO8 | 3 | ||
| Package Thermal Resistance, junction-to-case | θJC | 45 | °C/W | SO8 | 3 |
CAD (KiCad official)
- Symbol:
SY58873UFAC - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files:
sy58873ufac-etched.step/sy58873ufac-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sy58873ufac.step/sy58873ufac.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Silergy Corp datasheet (11 pp, sha256
d3bc4e134b824b06, retrieved 2026-10-18, 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).