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CD74HCT688E

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Texas Instruments Pre-ordered Chips, PDIP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Verified CD74HCT688E

by Ray · last 30 Oct 2026 · 1 record · files match
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Verification log 1 record

30 Oct 2026RayPublished by the parts factory: tier mfr, 20 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: CD74HCT688E · PDIP-20 · 20 pins
  • ✓copper: 20 copper pads, none touching another net
  • ✓datasheet: all 20 pin names found in the 26-page datasheet
  • ✓distributor: lcsc C1523711, digikey 296-2131-5-ND, mouser 595-CD74HCT688E
  • ✓family: DIP-20_W7.62mm
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-ozxzclns/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 20 pins = 20 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 20 pins agree
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ cd74hct688e.kicad_sym✓ cd74hct688e.kicad_mod✓ cd74hct688e.step
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CD74HCT688E

Texas Instruments · Pre-ordered Chips · PDIP-20

CD74HCT688E from Texas Instruments, in a PDIP-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 E input Active-low enable input; when E is high, output Y is forced high regardless of the A and B inputs.
2 A0 input Word A data input bit 0, compared against B0.
3 B0 input Word B data input bit 0, compared against A0.
4 A1 input Word A data input bit 1, compared against B1.
5 B1 input Word B data input bit 1, compared against A1.
6 A2 input Word A data input bit 2, compared against B2.
7 B2 input Word B data input bit 2, compared against A2.
8 A3 input Word A data input bit 3, compared against B3.
9 B3 input Word B data input bit 3, compared against A3.
10 GND power_in Ground reference for the device.
11 A4 input Word A data input bit 4, compared against B4.
12 B4 input Word B data input bit 4, compared against A4.
13 A5 input Word A data input bit 5, compared against B5.
14 B5 input Word B data input bit 5, compared against A5.
15 A6 input Word A data input bit 6, compared against B6.
16 B6 input Word B data input bit 6, compared against A6.
17 A7 input Word A data input bit 7, compared against B7.
18 B7 input Word B data input bit 7, compared against A7.
19 Y output Comparator output, low when A equals B and E is low, usable as enable input to a cascaded device.
20 VCC power_in Positive supply voltage, 4.5 V to 5.5 V for HCT types, with a 0.1-µF bypass capacitor recommended.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package PDIP-20
Category Interface ICs
Pins 20

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Supply voltage VCC -0.5 7 V 4
Input diode current IIK -20 20 mA For VI < -0.5 V or VI > VCC + 0.5 V 4
Output diode current IOK -20 20 mA For VO < -0.5 V or VO > VCC + 0.5 V 4
Output source or sink current per output pin IO -25 25 mA For VO > -0.5 V or VO < VCC + 0.5 V 4
Continuous current through VCC or GND -50 50 mA 4
Junction temperature TJ 150 °C 4
Storage temperature range Tstg -65 150 °C 4
Lead temperature (soldering) 300 °C Soldering 10 s, SOIC lead tips only 4
Supply voltage range (HCT types) VCC 4.5 5.5 V HCT types 4
Input or output voltage VI, VO 0 V Maximum printed as VCC 4
Input rise and fall time tt 500 ns VCC = 4.5 V 4
Temperature range TA -55 125 ℃ 4
Junction-to-ambient thermal resistance (PDIP, N) RθJA 84.6 °C/W PDIP (N) 20-pin package 4
Junction-to-case (top) thermal resistance (PDIP, N) RθJC(top) 72.5 °C/W PDIP (N) 20-pin package 4
Junction-to-board thermal resistance (PDIP, N) RθJB 65.3 °C/W PDIP (N) 20-pin package 4
Junction-to-top characterization parameter (PDIP, N) ψJT 55.3 °C/W PDIP (N) 20-pin package 4
Junction-to-board characterization parameter (PDIP, N) ψJB 65.2 °C/W PDIP (N) 20-pin package 4
High level input voltage VIH 2 V VCC 4.5 to 5.5 V 5
Low level input voltage VIL 0.8 V VCC 4.5 to 5.5 V 5
High level output voltage VOH 4.4 V IOH = -20 μA, VCC 4.5 V 5
High level output voltage VOH 3.98 V IOH = -4 mA, VCC 4.5 V, TA = 25°C 5
High level output voltage VOH 3.84 V IOH = -4 mA, VCC 4.5 V, TA = -40 to 85°C 5
High level output voltage VOH 3.7 V IOH = -4 mA, VCC 4.5 V, TA = -55 to 125°C 5
Low level output voltage VOL 0.1 V IOL = 20 μA, VCC 4.5 V 5
Low level output voltage VOL 0.26 V IOL = 4 mA, VCC 4.5 V, TA = 25°C 5
Low level output voltage VOL 0.33 V IOL = 4 mA, VCC 4.5 V, TA = -40 to 85°C 5
Low level output voltage VOL 0.4 V IOL = 4 mA, VCC 4.5 V, TA = -55 to 125°C 5
Input leakage current II -0.1 0.1 μA VI = VCC or GND, VCC 5.5 V, TA = 25°C 5
Input leakage current II -1 1 μA VI = VCC or GND, VCC 5.5 V, TA = -40 to 85°C 5
Supply current ICC 8 μA VI = VCC or GND, VCC 5.5 V, TA = 25°C 5
Supply current ICC 80 μA VI = VCC or GND, VCC 5.5 V, TA = -40 to 85°C 5
Supply current ICC 160 μA VI = VCC or GND, VCC 5.5 V, TA = -55 to 125°C 5
Additional supply current per input pin (enable inputs) ΔICC 100 252 μA Enable inputs held at VCC -2.1, VCC 4.5 to 5.5 V, TA = 25°C 5
Additional supply current per input pin (enable inputs) ΔICC 315 μA Enable inputs held at VCC -2.1, VCC 4.5 to 5.5 V, TA = -40 to 85°C 5
Additional supply current per input pin (enable inputs) ΔICC 343 μA Enable inputs held at VCC -2.1, VCC 4.5 to 5.5 V, TA = -55 to 125°C 5
Additional supply current per input pin (data inputs) ΔICC 100 126 μA Data inputs held at VCC -2.1, VCC 4.5 to 5.5 V, TA = 25°C 5
Additional supply current per input pin (data inputs) ΔICC 157.5 μA Data inputs held at VCC -2.1, VCC 4.5 to 5.5 V, TA = -40 to 85°C 5
Additional supply current per input pin (data inputs) ΔICC 171.5 μA Data inputs held at VCC -2.1, VCC 4.5 to 5.5 V, TA = -55 to 125°C 5
Propagation delay An to output tPLH, tPHL 14 34 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = 25°C 6
Propagation delay An to output tPLH, tPHL 42 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = -40 to 85°C 6
Propagation delay An to output tPLH, tPHL 51 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = -55 to 125°C 6
Propagation delay Bn to output tPLH, tPHL 14 34 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = 25°C 6
Propagation delay Bn to output tPLH, tPHL 42 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = -40 to 85°C 6
Propagation delay Bn to output tPLH, tPHL 51 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = -55 to 125°C 6
Propagation delay E to output tPLH, tPHL 9 24 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = 25°C 6
Propagation delay E to output tPLH, tPHL 30 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = -40 to 85°C 6
Propagation delay E to output tPLH, tPHL 36 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = -55 to 125°C 6
Output transition time tTLH, tTHL 15 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = 25°C 6
Output transition time tTLH, tTHL 19 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = -40 to 85°C 6
Output transition time tTLH, tTHL 22 ns CL = 50 pF, input tr,tf = 6 ns, VCC 4.5 V, TA = -55 to 125°C 6

CAD (KiCad official)

  • Symbol: CD74HCT688E
  • Footprint: Package_DIP:DIP-20_W7.62mm
  • 3D model: PDIP-20 (KiCad packages3D, STEP)
  • 3D model files: cd74hct688e-etched.step / cd74hct688e-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); cd74hct688e.step / cd74hct688e.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (26 pp, sha256 871c1ed3b22e27bf, retrieved 2026-10-30, tier: manufacturer)
  • 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, primary claude-sonnet-5-5 (text+vision), consensus claude-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).

Datasheet PDF