RS2099XTSS16 from Jiangsu RUNIC Tech, in a TSSOP-16. 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	NO2	passive	Normally-Open analog switch terminal for channel 2. Connects to COM2 when IN1-2 = 1. Bidirectional analog signal path, 0 to V+ range, 0.6Ω typical on-resistance (V+=5V), ±500mA continuous.
2	COM2	passive	Common analog switch terminal for channel 2 SPDT. Routes to either NO2 (IN1-2=1) or NC2 (IN1-2=0). Bidirectional, 0 to V+ signal range, ±500mA continuous.
3	NC2	passive	Normally-Closed analog switch terminal for channel 2. Connects to COM2 when IN1-2 = 0. Bidirectional, 0 to V+ signal range, ±500mA continuous.
4	GND	power_in	Device ground reference. Tie to system ground.
5	NO3	passive	Normally-Open analog switch terminal for channel 3. Connects to COM3 when IN3-4 = 1. Bidirectional, 0 to V+ signal range, ±500mA continuous.
6	COM3	passive	Common analog switch terminal for channel 3 SPDT. Routes to either NO3 (IN3-4=1) or NC3 (IN3-4=0). Bidirectional, 0 to V+ signal range, ±500mA continuous.
7	NC3	passive	Normally-Closed analog switch terminal for channel 3. Connects to COM3 when IN3-4 = 0. Bidirectional, 0 to V+ signal range, ±500mA continuous.
8	IN3-4	input	Digital control input for channels 3 and 4. Logic 0 selects NC3/NC4 to COM3/COM4; logic 1 selects NO3/NO4 to COM3/COM4. TTL/CMOS compatible; VIH ≥ 1.5V (5V) / 1.3V (3.3V), VIL ≤ 0.6V (5V) / 0.5V (3.3V). Must not be left floating (tie to VIO or GND).
9	NO4	passive	Normally-Open analog switch terminal for channel 4. Connects to COM4 when IN3-4 = 1. Bidirectional, 0 to V+ signal range, ±500mA continuous.
10	COM4	passive	Common analog switch terminal for channel 4 SPDT. Routes to either NO4 (IN3-4=1) or NC4 (IN3-4=0). Bidirectional, 0 to V+ signal range, ±500mA continuous.
11	NC4	passive	Normally-Closed analog switch terminal for channel 4. Connects to COM4 when IN3-4 = 0. Bidirectional, 0 to V+ signal range, ±500mA continuous.
12	V+	power_in	Positive supply input, +1.8V to +5.5V. Bypass locally with a decoupling capacitor to GND. Quiescent current ≤ 1µA.
13	NO1	passive	Normally-Open analog switch terminal for channel 1. Connects to COM1 when IN1-2 = 1. Bidirectional, 0 to V+ signal range, ±500mA continuous.
14	COM1	passive	Common analog switch terminal for channel 1 SPDT. Routes to either NO1 (IN1-2=1) or NC1 (IN1-2=0). Bidirectional, 0 to V+ signal range, ±500mA continuous.
15	NC1	passive	Normally-Closed analog switch terminal for channel 1. Connects to COM1 when IN1-2 = 0. Bidirectional, 0 to V+ signal range, ±500mA continuous.
16	IN1-2	input	Digital control input for channels 1 and 2. Logic 0 selects NC1/NC2 to COM1/COM2; logic 1 selects NO1/NO2 to COM1/COM2. TTL/CMOS compatible; VIH ≥ 1.5V (5V) / 1.3V (3.3V), VIL ≤ 0.6V (5V) / 0.5V (3.3V). Must not be left floating (tie to VIO or GND).

Key specifications

Parameter	Value
Manufacturer	Jiangsu RUNIC Tech
Package	TSSOP-16
Category	Interface
Pins	16

Ordering variants

Same part, different packaging or reel option.

RS2099XTSS16
RS2099XTSS16XTQC16

CAD (KiCad official)

Symbol: RS2099XTSS16
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Jiangsu RUNIC Tech datasheet (12 pp, sha256 dcad3d9525dbca63, 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