RS0108YQ20 from Jiangsu RUNIC Tech, in a TSSOP-20. 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	A1	bidirectional	Input/output A1. Reference to VCCA (1.65-5.5 V). Bidirectional level-translated channel paired with B1.
2	VCCA	power_in	A-port supply voltage. 1.65 V ≤ VCCA ≤ 5.5 V and VCCA ≤ VCCB. Sets the A-side logic reference for pins A1-A8 and OE.
3	A2	bidirectional	Input/output A2. Reference to VCCA. Bidirectional level-translated channel paired with B2.
4	A3	bidirectional	Input/output A3. Reference to VCCA. Bidirectional level-translated channel paired with B3.
5	A4	bidirectional	Input/output A4. Reference to VCCA. Bidirectional level-translated channel paired with B4.
6	A5	bidirectional	Input/output A5. Reference to VCCA. Bidirectional level-translated channel paired with B5.
7	A6	bidirectional	Input/output A6. Reference to VCCA. Bidirectional level-translated channel paired with B6.
8	A7	bidirectional	Input/output A7. Reference to VCCA. Bidirectional level-translated channel paired with B7.
9	A8	bidirectional	Input/output A8. Reference to VCCA. Bidirectional level-translated channel paired with B8.
10	OE	input	Output Enable, active high. Referenced to VCCA (VIH ≥ 0.8·VCCA). Drive OE low to place all I/Os in the high-impedance 3-state; tie to GND through a pull-down resistor to guarantee Hi-Z during power-up/down. Internal pull-down current source is present when VCCA is powered.
11	GND	power_in	Ground reference for the device.
12	B8	bidirectional	Input/output B8. Reference to VCCB (2.3-5.5 V). Bidirectional level-translated channel paired with A8.
13	B7	bidirectional	Input/output B7. Reference to VCCB. Bidirectional level-translated channel paired with A7.
14	B6	bidirectional	Input/output B6. Reference to VCCB. Bidirectional level-translated channel paired with A6.
15	B5	bidirectional	Input/output B5. Reference to VCCB. Bidirectional level-translated channel paired with A5.
16	B4	bidirectional	Input/output B4. Reference to VCCB. Bidirectional level-translated channel paired with A4.
17	B3	bidirectional	Input/output B3. Reference to VCCB. Bidirectional level-translated channel paired with A3.
18	B2	bidirectional	Input/output B2. Reference to VCCB. Bidirectional level-translated channel paired with A2.
19	VCCB	power_in	B-port supply voltage. 2.3 V ≤ VCCB ≤ 5.5 V and VCCB ≥ VCCA. Sets the B-side logic reference for pins B1-B8.
20	B1	bidirectional	Input/output B1. Reference to VCCB. Bidirectional level-translated channel paired with A1.

Key specifications

Parameter	Value
Manufacturer	Jiangsu RUNIC Tech
Package	TSSOP-20
Category	Logic
Pins	20

Ordering variants

Same part, different packaging or reel option.

RS0108YQ20
RS0108YTQC20

CAD (KiCad official)

Symbol: RS0108YQ20
Footprint: Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm
3D model: TSSOP-20 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rs0108yq20.step`	267 KB	You want the bare part, or you mark your own boards.
`rs0108yq20-etched.step`	3.2 MB	You want the part with `RS0108YQ20` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 767 faces against 327 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 (21 pp, sha256 f033d93efb6757f4, 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