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Part Audit Report

Scope

Audit of the CD74HC4067E part metadata, schematic symbol, terminal descriptions/types, and PCB footprint against Texas Instruments documentation.

Authoritative references

Official TI datasheet: https://www.ti.com/lit/ds/symlink/cd74hc4067.pdf
TI product page: https://www.ti.com/product/CD74HC4067

The part already had a Datasheet URL populated (https://pdf1.alldatasheet.co.kr/datasheet-pdf/view/517534/TI/CD74HC4067E.html), so no Datasheet property update was required by the requested conditional workflow. The official TI URL above is preferable for future maintenance.

Metadata review

Table

Field	Project value	Datasheet / TI value	Result
MPN	CD74HC4067E	CD74HC4067E	Match
Manufacturer	Texas Instruments	Texas Instruments	Match
Package	PDIP	E suffix: 24-pin PDIP, TI package drawing N	Match, but package property could be more specific (`PDIP-24 / N`)
Pin count	24 terminals	24 pins	Match
Description	Project description: “High Speed CMOS 16-Ch MUX/DEMUX 24P PDIP”; no explicit indexed Description property	High-speed CMOS 16-channel analog multiplexer/demultiplexer	Functionally correct; explicit Description property appears absent
Datasheet	Third-party mirror is populated	Official TI PDF available	Not missing, but non-authoritative URL
Designator prefix	IC	IC	Reasonable

Symbol and pinout cross-check

All 24 terminal numbers and names match the TI top-view pinout:

Table

Pin	Project terminal	TI function	Result
1	COMMON_INPUT/OUTPUT	Common analog input/output	Match
2–9	I7, I6, I5, I4, I3, I2, I1, I0	Bidirectional switch channels	Match
10–11	S0, S1	Select/address inputs	Match
12	GND	Ground	Match
13–14	S3, S2	Select/address inputs	Match
15	~E	Active-low enable	Match; TI labels it E with an active-low bar
16–23	I15, I14, I13, I12, I11, I10, I9, I8	Bidirectional switch channels	Match
24	VCC	Positive supply	Match

Symbol metadata mismatches

Every terminal has Pin Type: Unspecified. TI defines pins 1–9 and 16–23 as bidirectional I/O, pins 10, 11, 13, 14, and 15 as inputs, and pins 12 and 24 as power pins.
Explicit Pin Description properties are absent. The names communicate the pinout, but the semantic descriptions should identify switch I/O, select/address, active-low enable, ground, and supply roles.
The active-low nature of pin 15 is represented by ~E; this is electrically correct, though a rendered overbar should be visually verified.

Footprint cross-check

Matching geometry

24 pads are present.
Pad numbering follows the correct counter-clockwise DIP sequence when viewed from the top.
Measured pad pitch is 2.54 mm.
Row center spacing is 15.24 mm.
Pin 1 uses a rectangular marker; the other pads are circular.
The footprint asset name (DIP1524W53P254L3104H508Q24N.kicad_mod) is consistent with a 24-pin, 2.54-mm-pitch, 15.24-mm-row-spacing DIP and approximately 31-mm body length.

Footprint concerns

The inspected pad diameter resolves to approximately 1.13 mm. That is unusually small for a hand-soldered PDIP annular pad and leaves little margin around a typical DIP lead/drill. Confirm the plated-hole diameter and annular ring before publishing or manufacturing.
No explicit drill/hole size was exposed in the inspected pad rules. Because CD74HC4067E is through-hole, absence of a plated drill would be a critical footprint defect. This requires direct footprint-editor/Gerber verification.
The asset naming suggests a body-width field near 5.3 mm, which is ambiguous for the wide 15.24-mm-row PDIP. Verify the silkscreen/courtyard body outline against TI package N; pad row spacing itself is correct.

Key electrical specifications

Function: digitally controlled, bidirectional 16-channel analog multiplexer/demultiplexer.
HC supply range: 2 V to 6 V.
Analog switch signal range: 0 V to VCC.
Ambient operating range: −55 °C to +125 °C.
Typical on resistance: 70 Ω at VCC = 4.5 V; 60 Ω at VCC = 6 V.
Typical break-before-make interval: 6 ns at VCC = 4.5 V.
Typical −3 dB bandwidth: 89 MHz at VCC = 4.5 V.
Typical THD: 0.051% at 1 kHz, 4 Vpp, VCC = 4.5 V.
Typical off-state feedthrough: −75 dB.
Typical switch input capacitance: 5 pF; common capacitance: 50 pF.
PDIP junction-to-ambient thermal resistance: 67 °C/W.

Overall assessment

The MPN, package family, pin count, terminal names, and pin-number mapping are correct. The main quality issues are incomplete terminal semantic metadata and an unresolved footprint manufacturability concern around plated-hole/drill definition and annular-pad sizing. The official TI datasheet was found, but the existing Datasheet property was not overwritten because it was already populated.

Scope
Authoritative references
Metadata review
Symbol and pinout cross-check
Symbol metadata mismatches
Footprint cross-check
Matching geometry
Footprint concerns
Key electrical specifications
Overall assessment

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