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SN74CB3Q3345DBQR

Public Made by Adom

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Texas Instruments Analog Switches, Multiplexers, QSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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docs sn74cb3q3345dbqr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
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README.md Initial commit: component/sn74cb3q3345dbqr · Ray 9d ago
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sn74cb3q3345dbqr-etched.glb sn74cb3q3345dbqr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
sn74cb3q3345dbqr-etched.step sn74cb3q3345dbqr: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 2d ago
sn74cb3q3345dbqr.glb Publish 0.1.0 · Ray 9d ago
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sn74cb3q3345dbqr.step Publish 0.1.0 · Ray 9d ago

SN74CB3Q3345DBQR

Texas Instruments · Analog Switches, Multiplexers · QSOP-20

SN74CB3Q3345DBQR from Texas Instruments, in a QSOP-20. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 OE input Active-low control logic input; pulling this pin low connects all switch A side to B side.
2 A1 bidirectional Port A pin 1; can be input or output; supports signals from 0 to 5V.
3 A2 bidirectional Port A pin 2; can be input or output; supports signals from 0 to 5V.
4 A3 bidirectional Port A pin 3; can be input or output; supports signals from 0 to 5V.
5 A4 bidirectional Port A pin 4; can be input or output; supports signals from 0 to 5V.
6 A5 bidirectional Port A pin 5; can be input or output; supports signals from 0 to 5V.
7 A6 bidirectional Port A pin 6; can be input or output; supports signals from 0 to 5V.
8 A7 bidirectional Port A pin 7; can be input or output; supports signals from 0 to 5V.
9 A8 bidirectional Port A pin 8; can be input or output; supports signals from 0 to 5V.
10 GND power_in Ground (0V) reference.
11 B8 bidirectional Port B pin 8; can be input or output; supports signals from 0 to 5V.
12 B7 bidirectional Port B pin 7; can be input or output; supports signals from 0 to 5V.
13 B6 bidirectional Port B pin 6; can be input or output; supports signals from 0 to 5V.
14 B5 bidirectional Port B pin 5; can be input or output; supports signals from 0 to 5V.
15 B4 bidirectional Port B pin 4; can be input or output; supports signals from 0 to 5V.
16 B3 bidirectional Port B pin 3; can be input or output; supports signals from 0 to 5V.
17 B2 bidirectional Port B pin 2; can be input or output; supports signals from 0 to 5V.
18 B1 bidirectional Port B pin 1; can be input or output; supports signals from 0 to 5V.
19 OE input Active-high control logic input; pulling this pin high connects all switch A side to B side.
20 VCC power_in Positive power supply (2.3 to 3.6 V); connect 0.1 to 10 µF decoupling capacitor between VCC and GND.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package QSOP-20
Category Interface
Pins 20

CAD (KiCad official)

  • Symbol: SN74CB3Q3345DBQR
  • Footprint: Package_SO:QSOP-20_3.9x8.7mm_P0.635mm
  • 3D model: QSOP-20 (KiCad packages3D, STEP)
  • 3D model files: sn74cb3q3345dbqr-etched.step / sn74cb3q3345dbqr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); sn74cb3q3345dbqr.step / sn74cb3q3345dbqr.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (20 pp, sha256 b65cc6b2f5126dfe, retrieved 2026-09-26, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • Extractor: parts-factory 2.0.0 / extract_pins 0.2, primary claude-haiku-4-5-20251001 (text), consensus claude-sonnet-4-6 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF