RS2166XF5 from Jiangsu RUNIC Tech, in a SOT-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	S	bidirectional	Source pin. Bidirectional analog/digital signal path through the SPST switch. Signal range 0 to Vcc; input/output are identical and interchangeable.
2	D	bidirectional	Drain pin. Bidirectional analog/digital signal path through the SPST switch. Signal range 0 to Vcc; input/output are identical and interchangeable.
3	GND	power_in	Ground reference for the device.
4	SEL	input	Digital switch enable control input (TTL/CMOS compatible). High level turns the S-D switch ON, Low level turns it OFF. VIH ≥ 1.5V (5V supply) / 1.3V (3.3V), VIL ≤ 0.6V / 0.5V. Input leakage ≤ 1 µA.
5	VCC	power_in	Positive supply input, 1.8V to 5.5V recommended (absolute max 6.0V). Supply current ≤ 1 µA at 5.5V.

Key specifications

Parameter	Value
Manufacturer	Jiangsu RUNIC Tech
Package	SOT-23-5
Category	Interface
Pins	5

Ordering variants

Same part, different packaging or reel option.

RS2166XF5
RS2166XF5XC5

CAD (KiCad official)

Symbol: RS2166XF5
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Jiangsu RUNIC Tech datasheet (12 pp, sha256 3ea564ad812cfa21, retrieved 2026-08-17, tier: lcsc)
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