component
SY50281AAC
Public Made by Adomby adom
Silergy Corp AC-DC Controllers And Regulators, SOT-23-5. 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
markdownSY50281AAC
Silergy Corp · AC-DC Controllers And Regulators · SOT-23-5
SY50281AAC from Silergy Corp, in a SOT-23-5. 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 | VSEN | input | Voltage sense pin that connects to a resistor divider on the inductor or auxiliary winding to sense output voltage, with absolute maximum rating of -0.3V to 17V and internal reference of 1.25V typical (1.215V to 1.285V). |
| 2 | VIN | power_in | Power supply pin with recommended operating range of 8V to 15.4V and absolute maximum of -0.3V to 17V and 20mA input current. |
| 3 | GND | power_in | Ground pin for the controller. |
| 4 | ISET | passive | Current set pin where a resistor programs the reference output current, with absolute maximum of -0.3V to 3.6V and reference voltage VREF of 675mV typical (620mV to 710mV). |
| 5 | LX | output | Internal high-voltage MOSFET drain pin rated for 500V breakdown voltage, with absolute maximum drain current of 1.4A. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Silergy Corp |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VIN supply voltage (recommended operating) | VIN | 8 | 15.4 | V | 3 | ||
| Junction temperature range (recommended operating) | -40 | 125 | °C | 3 | |||
| ISET pin voltage (absolute maximum) | -0.3 | 3.6 | V | 3 | |||
| VIN, VSEN pin voltage (absolute maximum) | VIN, VSEN | -0.3 | 17 | V | 3 | ||
| VIN pin input current (absolute maximum) | IVIN | 20 | mA | 3 | |||
| LX drain current (absolute maximum) | ILX | 1.4 | A | 3 | |||
| LX pin voltage (absolute maximum) | LX | 500 | V | 3 | |||
| Maximum junction temperature (absolute maximum) | 160 | °C | 3 | ||||
| Lead temperature (absolute maximum) | 260 | °C | Soldering, 10 sec. | 3 | |||
| Storage temperature range (absolute maximum) | -65 | 150 | °C | 3 | |||
| VSEN pin reference voltage | VVSEN,REF | 1.215 | 1.25 | 1.285 | V | VIN = 12V, TA = 25°C | 4 |
| Min ON time | tON,MIN | 300 | ns | VIN = 12V, TA = 25°C | 4 | ||
| Max ON time | tON,MAX | 25 | µs | VIN = 12V, TA = 25°C | 4 | ||
| Min OFF time | tOFF,MIN | 1.8 | µs | VIN = 12V, TA = 25°C | 4 | ||
| Max OFF time | tOFF,MAX | 150 | µs | VIN = 12V, TA = 25°C | 4 | ||
| Max switching frequency | fMAX | 45 | kHz | VIN = 12V, TA = 25°C | 4 | ||
| Current reference | VREF | 620 | 675 | 710 | mV | VIN = 12V, TA = 25°C | 4 |
| Package thermal resistance, junction-to-ambient (SOT23-5) | θJA | 88 | °C/W | SOT23-5; Note 2 test board (JEDEC 51-3) | 3 | ||
| Package thermal resistance, junction-to-case (SOT23-5) | θJC | 45 | °C/W | SOT23-5 | 3 | ||
| VIN turn-on threshold | VVIN,ON | 14 | V | VIN = 12V, TA = 25°C | 4 | ||
| VIN turn-off threshold | VVIN,OFF | 7 | V | VIN = 12V, TA = 25°C | 4 | ||
| Start up current | IST | 15 | µA | VIN = 12V, TA = 25°C | 4 | ||
| BV of HV MOSFET | VBV | 500 | V | VIN = 12V, TA = 25°C | 4 | ||
| Turn-on resistor (integrated MOSFET) | Rdson | 12 | VIN = 12V, TA = 25°C | 4 | |||
| Thermal shutdown temperature | TSD | 150 | C | 4 |
CAD (KiCad official)
- Symbol:
SY50281AAC - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
sy50281aac-etched.step/sy50281aac-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sy50281aac.step/sy50281aac.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Silergy Corp datasheet (12 pp, sha256
b5a1ca616f8ad540, 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).