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SN74CB3Q3345DBQR
Public Made by Adomby adom
Texas Instruments Analog Switches, Multiplexers, QSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownSN74CB3Q3345DBQR
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74cb3q3345dbqr.step/sn74cb3q3345dbqr.glbare 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, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).