RS2253XTSS16 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	Y1	passive	Analog Switch 'Y' Normally Open input/output. Bidirectional analog switch terminal; connected to Y when address B=1 and ENABLE is low.
2	Y0	passive	Analog Switch 'Y' Normally Closed input/output. Bidirectional analog switch terminal; connected to Y when address B=0 and ENABLE is low.
3	Z1	passive	Analog Switch 'Z' Normally Open input/output. Bidirectional analog switch terminal; connected to Z when address C=1 and ENABLE is low.
4	Z	passive	Analog Switch 'Z' common (pole) terminal. Switched to Z0 or Z1 based on the C address input.
5	Z0	passive	Analog Switch 'Z' Normally Closed input/output. Bidirectional analog switch terminal; connected to Z when address C=0 and ENABLE is low.
6	ENABLE	input	Active-low digital enable input. When low, the addressed channels are ON; when high, all switches are OFF. Normally connected to GND. Logic thresholds: VIH >= 1.7 V, VIL <= 0.5 V.
7	NC	unconnected	No connect. Leave floating or tie to GND.
8	GND	power_in	Ground reference. Connect to digital/analog ground.
9	C	input	Digital Address 'C' input. Selects Z0 (C=0) or Z1 (C=1) when ENABLE is low. Logic thresholds: VIH >= 1.7 V, VIL <= 0.5 V.
10	B	input	Digital Address 'B' input. Selects Y0 (B=0) or Y1 (B=1) when ENABLE is low. Logic thresholds: VIH >= 1.7 V, VIL <= 0.5 V.
11	A	input	Digital Address 'A' input. Selects X0 (A=0) or X1 (A=1) when ENABLE is low. Logic thresholds: VIH >= 1.7 V, VIL <= 0.5 V.
12	X0	passive	Analog Switch 'X' Normally Closed input/output. Bidirectional analog switch terminal; connected to X when address A=0 and ENABLE is low.
13	X1	passive	Analog Switch 'X' Normally Open input/output. Bidirectional analog switch terminal; connected to X when address A=1 and ENABLE is low.
14	X	passive	Analog Switch 'X' common (pole) terminal. Switched to X0 or X1 based on the A address input.
15	Y	passive	Analog Switch 'Y' common (pole) terminal. Switched to Y0 or Y1 based on the B address input.
16	VCC	power_in	Positive analog and digital supply voltage input. Operating range +2.5 V to +5.5 V; absolute maximum 6 V.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

RS2253XTSS16
RS2253XTSS16XS16
RS2253XTSS16XSS16
RS2253XTSS16XTQC16

CAD (KiCad official)

Symbol: RS2253XTSS16
Footprint: Package_SO:TSSOP-16_4.4x5mm_P0.65mm
3D model: TSSOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rs2253xtss16.step`	205 KB	You want the bare part, or you mark your own boards.
`rs2253xtss16-etched.step`	3.2 MB	You want the part with `RS2253XTSS16` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 773 faces against 255 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: Jiangsu RUNIC Tech datasheet (14 pp, sha256 78726105ffac9c2c, 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