RT8471GJ5 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	LX	output	Switch output terminal. Drain of the internal low-side N-MOSFET (R_DS(on) typ 350 mΩ). Connects to the inductor / freewheeling diode node of the step-down converter. Absolute max: -0.3 V to (VIN + 0.7 V).
2	GND	power_in	Ground return for the device. Should be connected to a large PCB ground plane for maximum power dissipation.
3	ADJ	input	Dimming control input. Accepts an analog signal (0.3 V to 1.3 V range, ~1.2 V threshold) for analog PWM dimming, or a digital PWM signal (logic-high ≥ 1.4 V, logic-low ≤ 0.2 V) for direct PWM dimming of the LED string. Float or tie high for full brightness.
4	SENSE	input	High-side output current sense input. An external sense resistor (Rs) between VIN and SENSE sets the nominal average LED current; the internal comparator regulates to V_SENSE ≈ 100 mV (typ) with ±15% hysteresis. Sense pin input current ≈ 300 nA.
5	VIN	power_in	Supply input voltage. Operating range 7 V to 36 V (absolute max 40 V). Bypass with a local input capacitor C_IN close to the pin.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

RT8471GJ5
RT8471GJ5GSP
RT8471GJ5ZSP
RT8471GJ5GFP

CAD (KiCad official)

Symbol: RT8471GJ5
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 (15 pp, sha256 b227c8211fadf1dd, 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