component
SY58874UFAC
Public Made by Adomby adom
Silergy Corp AC-DC Controllers And Regulators, SOP-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
markdownSY58874UFAC
Silergy Corp · AC-DC Controllers And Regulators · SOP-8
SY58874UFAC from Silergy Corp, in a SOP-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; the datasheet gives the CS limit as VCS_LIMIT 530 mV, and the internal GM error amplifier output is pinned out to this pin. |
| 2 | FB | input | Voltage feedback pin, connected to a resistor divider to sense the output voltage; the absolute maximum rating is -0.3V to 16V and the internal reference is 1.225 V. |
| 3 | GND | power_in | Ground pin. |
| 4 | VCC | power_in | Power supply pin; the datasheet gives the absolute maximum rating as -0.3V to 20V, the turn-on threshold as 14 V and the turn-off threshold as 7.45 V. |
| 5 | LX | passive | Internal high-voltage MOSFET drain pin, rated 520 V (BV of HV MOSFET). |
| 6 | LX | passive | Internal high-voltage MOSFET drain pin, rated 520 V (BV of HV MOSFET). |
| 7 | LX | passive | Internal high-voltage MOSFET drain pin, rated 520 V (BV of HV MOSFET). |
| 8 | LX | passive | Internal high-voltage MOSFET drain pin, rated 520 V (BV of HV MOSFET). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Silergy Corp |
| Package | SOP-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 |
|---|---|---|---|---|---|---|---|
| CS pin voltage | -0.3 | 3.6 | V | 3 | |||
| FB pin voltage | -0.3 | 16 | V | 3 | |||
| VCC pin voltage | -0.3 | 20 | V | 3 | |||
| LX pin voltage (HV MOSFET drain) | 520 | V | 3 | ||||
| Power Dissipation SO8 | 1.1 | W | TA = 25°C | 3 | |||
| Lead Temperature (Soldering) | 260 | °C | Soldering, 10 sec. | 3 | |||
| Storage Temperature Range | -65 | 150 | °C | 3 | |||
| VCC Turn-on Threshold | VVCC_ON | 14 | V | 4 | |||
| VCC Turn-off Threshold | VVCC_OFF | 7.45 | V | 4 | |||
| VCC Shunt Voltage | VVCC_SHUNT | 14.8 | V | VVCC>2mA | 4 | ||
| Start up Current | IST | 53 | µA | VVCC=12V | 4 | ||
| Quiescent Current | IQ | 270 | µA | 4 | |||
| CS Limit | VCS_LIMIT | 530 | mV | 4 | |||
| Reference Voltage for Feedback | VREF | 1.225 | V | 4 | |||
| Internal OVP Voltage Threshold | VREF_OVP | 1.4 | V | 4 | |||
| Min ON Time | TON_MIN | 700 | ns | 4 | |||
| Max ON Time | TON_MAX | 20 | µs | 4 | |||
| Min OFF Time | TOFF_MIN | 1.7 | µs | 4 | |||
| Max OFF Time | TOFF_MAX | 50 | µs | 4 | |||
| BV of HV MOSFET | VBV | 520 | V | 4 | |||
| Rdson of HV MOSFET | RDSON | 3.4 | Ω | 4 | |||
| Thermal Shut Down Temperature | TSD | 160 | ºC | 4 | |||
| Package thermal resistance junction-to-ambient | θJA | 88 | °C/W | Natural convection, TA=25°C, JEDEC 51-3 low-K board (Note 2) | 3 | ||
| Package thermal resistance junction-to-case | θJC | 45 | °C/W | 3 |
CAD (KiCad official)
- Symbol:
SY58874UFAC - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
sy58874ufac-etched.step/sy58874ufac-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sy58874ufac.step/sy58874ufac.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Silergy Corp datasheet (8 pp, sha256
753b3ff1d4af7eaf, 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).