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SN74HC688DWR
Public Made by Adomby adom
Texas Instruments Comparators, SOIC-20-300mil. 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
markdownSN74HC688DWR
Texas Instruments · Comparators · SOIC-20-300mil
SN74HC688DWR from Texas Instruments, in a SOIC-20-300mil. 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 output-enable input that forces the P=Q output high when driven high; unused inputs must be held at VCC or GND. |
| 2 | P0 | input | Word P data input bit 0, compared with Q0, with input clamp current of ±20 mA maximum. |
| 3 | Q0 | input | Word Q data input bit 0, compared with P0, with input clamp current of ±20 mA maximum. |
| 4 | P1 | input | Word P data input bit 1, compared with Q1, with input clamp current of ±20 mA maximum. |
| 5 | Q1 | input | Word Q data input bit 1, compared with P1, with input clamp current of ±20 mA maximum. |
| 6 | P2 | input | Word P data input bit 2, compared with Q2, with input clamp current of ±20 mA maximum. |
| 7 | Q2 | input | Word Q data input bit 2, compared with P2, with input clamp current of ±20 mA maximum. |
| 8 | P3 | input | Word P data input bit 3, compared with Q3, with input clamp current of ±20 mA maximum. |
| 9 | Q3 | input | Word Q data input bit 3, compared with P3, with input clamp current of ±20 mA maximum. |
| 10 | GND | power_in | Ground reference; continuous current through VCC or GND is limited to ±50 mA. |
| 11 | P4 | input | Word P data input bit 4, compared with Q4, with input clamp current of ±20 mA maximum. |
| 12 | Q4 | input | Word Q data input bit 4, compared with P4, with input clamp current of ±20 mA maximum. |
| 13 | P5 | input | Word P data input bit 5, compared with Q5, with input clamp current of ±20 mA maximum. |
| 14 | Q5 | input | Word Q data input bit 5, compared with P5, with input clamp current of ±20 mA maximum. |
| 15 | P6 | input | Word P data input bit 6, compared with Q6, with input clamp current of ±20 mA maximum. |
| 16 | Q6 | input | Word Q data input bit 6, compared with P6, with input clamp current of ±20 mA maximum. |
| 17 | P7 | input | Word P data input bit 7, compared with Q7, with input clamp current of ±20 mA maximum. |
| 18 | Q7 | input | Word Q data input bit 7, compared with P7, with input clamp current of ±20 mA maximum. |
| 19 | P=Q | output | Active-low identity output that goes low when P equals Q and OE is low, with ±4 mA drive at 4.5 V. |
| 20 | VCC | power_in | Supply voltage, 2 V to 6 V recommended, with a 0.1-µF bypass capacitor recommended close to the pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-20-300mil |
| Category | Amplifiers/Comparators |
| Pins | 20 |
CAD (KiCad official)
- Symbol:
SN74HC688DWR - Footprint:
Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm - 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files:
sn74hc688dwr-etched.step/sn74hc688dwr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);sn74hc688dwr.step/sn74hc688dwr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (24 pp, sha256
3f795e093bf7055e, retrieved 2026-10-01, 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 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-5-5(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).