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RT9742AGJ5F

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by Ray

Richtek Tech AC-DC Controllers and Regulators, TSOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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RT9742AGJ5F

Richtek Tech · AC-DC Controllers and Regulators · TSOT-23-5

RT9742AGJ5F from Richtek Tech, in a TSOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 VOUT power_out Switched power output to the load (e.g. USB VBUS). Sourced from VIN through the internal N-MOSFET high-side switch (RDS(ON) ~55 mΩ typ.). Rated up to 3A; includes an internal auto-discharge path to GND when the switch is disabled.
2 GND power_in Device ground reference for all internal circuitry and the source of the auto-discharge FET.
3 FLG output Active-low, open-drain fault FLAG output. Pulls low approximately 10 ms after an over-current or over-temperature (thermal shutdown) event to signal a fault to the host USB controller. Requires an external pull-up resistor. Absolute max 7V.
4 EN input Chip enable input. For the RT9742A option this pin is active-high: drive high to turn the power switch on, low to disable it (VOUT auto-discharges). Input range 0V to 6V; absolute max -0.3V to 7V.
5 VIN power_in Power input voltage, 2.7V to 6V recommended (7V absolute max). Feeds the internal N-MOSFET high-side switch and internal bias/charge pump. Decouple with a local input capacitor (CIN, e.g. 10 uF).

Key specifications

Parameter Value
Manufacturer Richtek Tech
Package TSOT-23-5
Category PMIC
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • RT9742AGJ5F
  • RT9742AGJ5FBGJ5F
  • RT9742AGJ5FANGJ5F
  • RT9742AGJ5FBNGJ5F
  • RT9742AGJ5FCGJ5F
  • RT9742AGJ5FDGJ5F
  • RT9742AGJ5FCNGJ5F
  • RT9742AGJ5FDNGJ5F
  • RT9742AGJ5FEGJ5F
  • RT9742AGJ5FFGJ5F
  • RT9742AGJ5FENGJ5F
  • RT9742AGJ5FFNGJ5F
  • RT9742AGJ5FGGJ5F
  • RT9742AGJ5FHGJ5F
  • RT9742AGJ5FGNGJ5F
  • RT9742AGJ5FHNGJ5F
  • RT9742AGJ5FNGJ5F
  • RT9742AGJ5FPGJ5F
  • RT9742AGJ5FNNGJ5F
  • RT9742AGJ5FPNGJ5F
  • RT9742AGJ5FCGJ5
  • RT9742AGJ5FDGJ5
  • RT9742AGJ5FCNGJ5
  • RT9742AGJ5FDNGJ5
  • RT9742AGJ5FEGJ5
  • RT9742AGJ5FFGJ5
  • RT9742AGJ5FENGJ5
  • RT9742AGJ5FFNGJ5
  • RT9742AGJ5FGGJ5
  • RT9742AGJ5FHGJ5
  • RT9742AGJ5FGNGJ5
  • RT9742AGJ5FHNGJ5
  • RT9742AGJ5FMGJ5
  • RT9742AGJ5FMNGJ5
  • RT9742AGJ5FNGJ5
  • RT9742AGJ5FQGJ5
  • RT9742AGJ5FRGJ5
  • RT9742AGJ5FQNGJ5
  • RT9742AGJ5FRNGJ5
  • RT9742AGJ5FUNGJ5
  • RT9742AGJ5FJNGV
  • RT9742AGJ5FKNGV
  • RT9742AGJ5FLNGV
  • RT9742AGJ5FSNGV

CAD (KiCad official)

  • Symbol: RT9742AGJ5F
  • Footprint: Package_TO_SOT_SMD:SOT-23-5
  • 3D model: TSOT-23-5 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Richtek Tech datasheet (18 pp, sha256 5f2efe133f299f2b, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF