component
RT9742SNGV
Public Made by Adomby adom
Richtek Tech Power Distribution Switches, SOT-23-3. 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
markdownRT9742SNGV
Richtek Tech · Power Distribution Switches · SOT-23-3
RT9742SNGV from Richtek Tech, in a SOT-23-3. 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 | VIN | power_in | Power input voltage and MOSFET drain, operating range 2.7V to 6V (7V absolute maximum), with a 10µF low-ESR ceramic capacitor to GND placed close to the pin recommended. |
| 2 | VOUT | power_out | Switch output (MOSFET source) that delivers load current from VIN, with current limit at 0.7A typical for the RT9742S and a 0.1µF output capacitor to GND recommended. |
| 3 | GND | power_in | Ground. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Richtek Tech |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| Pins | 3 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input Quiescent Current | IQ | 30 | 40 | µA | Switch on, VOUT = open | 5 | |
| Input Shutdown Current | ISHDN | 0.1 | 1 | µA | VIN = 5V, no load on OUT, device OFF, VEN = 0V or VEN = 5V | 5 | |
| Switch On Resistance (RT9742XXJ5/V variant, applies to SNGV) | RDS(ON) | 70 | mΩ | RT9742XXJ5/V | 5 | ||
| Over Current Trip Threshold (RT9742Q/R/S, 0.5A class) | ITRIP | 0.65 | 0.89 | 1 | A | VIN = 5V, 100A/s | 5 |
| Current Limit (RT9742Q/R/S, 0.5A class) | ILIM | 0.6 | 0.7 | 0.8 | A | VOUT = 1V | 6 |
| EN/EN Threshold Logic_High Voltage | VIH | 1.5 | V | VIN = 2.7V to 6V | 6 | ||
| EN/EN Threshold Logic_Low Voltage | VIL | 0.75 | V | VIN = 2.7V to 6V | 6 | ||
| EN/EN Input Current | IEN/EN | 0.5 | 0.5 | µA | VEN = 0V, VEN = 5V | 6 | |
| Output Leakage Current | ILEAKAGE | 0.5 | 1 | µA | VEN = 0V, RLOAD = 0 | 6 | |
| Reverse Leakage Current | IREV | 1 | µA | VOUT = 5V, VIN = 0V | 6 | ||
| FLG Off Current | IFLG_OFF | 0.01 | 1 | µA | VFLG = 5V | 6 | |
| Under-Voltage Lockout (VIN rising) | VUVLO | 2.4 | V | VIN rising | 6 | ||
| Supply Input Voltage VIN (recommended) | VIN | 2.7 | 6 | V | 5 | ||
| EN Voltage (recommended) | VEN | 0 | 6 | V | 5 | ||
| Junction Temperature Range (recommended) | TJ | -40 | 125 | °C | 5 | ||
| Ambient Temperature Range (recommended) | TA | -40 | 85 | °C | 5 | ||
| Supply Input Voltage VIN (absolute maximum) | VIN | 7 | V | 5 | |||
| EN Voltage (absolute maximum) | VEN | -0.3 | 7 | V | 5 | ||
| FLAG Voltage (absolute maximum) | VFLAG | 7 | V | 5 | |||
| Power Dissipation, SOT-23-3 | PD | 0.41 | W | TA = 25°C | 5 | ||
| Junction Temperature (absolute maximum) | TJ | 150 | °C | 5 | |||
| Lead Temperature (Soldering) | 260 | °C | 10 sec. | 5 | |||
| Storage Temperature Range | -65 | 150 | °C | 5 | |||
| ESD Susceptibility HBM | 2 | kV | Human Body Model | 5 | |||
| Package Thermal Resistance, SOT-23-3 | θJA | 243.3 | °C/W | JEDEC 51-7 four-layer test board | 5 |
CAD (KiCad official)
- Symbol:
RT9742SNGV - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files:
rt9742sngv-etched.step/rt9742sngv-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);rt9742sngv.step/rt9742sngv.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Richtek Tech datasheet (19 pp, sha256
4512463eff0aa45d, retrieved 2026-11-03, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).