Part Audit

flux

I’ll audit the part metadata, find and attach the official Microchip datasheet if needed, then cross-check the symbol, footprint, and pin descriptions and document any mismatches.

flux

I’m reading the part’s current terminals and package geometry now; next I’ll compare them against the manufacturer’s package and pin tables.
Created a project doc

Part Audit

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Part Audit Result
The part is a Microchip PIC16F18446 in the extended-temperature, 20-lead PDIP ordering variant. The official datasheet is PIC16(L)F18426/46 Data Sheet DS40001985C.
Current metadata Ordering-code interpretation
  • PIC16F18446: 8-bit PIC microcontroller, 28 KB Flash family member.
  • E: extended temperature range, -40°C to +125°C.
  • /P: 20-lead, 300 mil body PDIP package.
Key specifications
  • Architecture: enhanced mid-range 8-bit PIC MCU.
  • Maximum clock: 32 MHz.
  • Operating voltage for PIC16F variant: 2.3 V to 5.5 V.
  • Program memory: 28 KB / 16K instructions.
  • RAM: 2048 bytes.

flux

Audit complete. I attached and verified the official Microchip datasheet; the 20-pin PDIP footprint and pin-number mapping match, but pin 4’s electrical type, VSS typing, canonical MPN formatting, broad part type, and missing pin descriptions need correction.
Full specifications and findings: Part Audit.
Correct metadata and pins
Update package metadata
Inspect 3D package fit
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Files

Pins

Symbol

Layout

Preview

RB5
Pin Number
12
RA4
Pin Number
3
~MCLR~/VPP/RA3
Pin Number
4
VDD
Pin Number
1
RC3
Pin Number
7
RA2
Pin Number
17
RC6
Pin Number
8
RC5
Pin Number
5
RB4
Pin Number
13
RB7
Pin Number
10
RC7
Pin Number
9
RA5
Pin Number
2
RA1/ICSPCLK
Pin Number
18
RA0/ICSPDAT
Pin Number
19
VSS
Pin Number
20
RC4
Pin Number
6
RC2
Pin Number
14
RC0
Pin Number
16
RC1
Pin Number
15
RB6
Pin Number
11
Part Audit
Result
The part is a Microchip PIC16F18446 in the extended-temperature, 20-lead PDIP ordering variant. The official datasheet is PIC16(L)F18426/46 Data Sheet DS40001985C.
Current metadata

Table

FieldCurrent valueDatasheet assessment
Project/part namePIC16F18446-E_PIntended ordering code is PIC16F18446-E/P; underscore is likely a URL/name-safe substitution, but the MPN property should use the canonical slash form.
ManufacturerMicrochipCorrect; preferred full name is Microchip Technology Inc.
Part typeIntegrated CircuitsToo broad; this is an 8-bit microcontroller.
DescriptionC / Microchip / 5.334mm / IPC 7351BInadequate and partly footprint-generator metadata, not a functional component description.
Datasheet URLOfficial Microchip DS40001985C URLAdded and verified by a self datasheet query.
Designator prefixUCorrect.
Pin count20Correct for the /P PDIP variant.
Ordering-code interpretation
  • PIC16F18446: 8-bit PIC microcontroller, 28 KB Flash family member.
  • E: extended temperature range, -40°C to +125°C.
  • /P: 20-lead, 300 mil body PDIP package.
Key specifications
  • Architecture: enhanced mid-range 8-bit PIC MCU.
  • Maximum clock: 32 MHz.
  • Operating voltage for PIC16F variant: 2.3 V to 5.5 V.
  • Program memory: 28 KB / 16K instructions.
  • RAM: 2048 bytes.
  • Data EEPROM: 256 bytes.
  • GPIO: up to 18 I/O pins; one pin is input-only.
  • ADC: 12-bit ADC with computation, up to 17 external channels, up to 140 ksps.
  • Analog: two comparators, one 5-bit DAC, fixed voltage reference, temperature sensor, zero-cross detector.
  • Communications: one EUSART and two MSSP blocks supporting SPI and I2C/SMBus/PMBus.
  • Timing/logic: four CCP, two 10-bit PWM, two CWG, four CLC, NCO, multiple 8/16-bit timers and one 24-bit SMT.
  • Other: Peripheral Pin Select, XLP low-power modes, ICSP/ICD programming and debugging.
Symbol and pin audit
All 20 package pin numbers map to the correct primary pin names for the 20-pin PDIP/SOIC/SSOP diagram:

Table

PinCurrent symbol nameDatasheet primary functionStatus
1VDDVDDMatch
2RA5RA5/CLKIN/SOSCI/OSC1Primary name matches
3RA4RA4/CLKOUT/SOSCO/OSC2Primary name matches
4MCLR/VPP/RA3MCLR/VPP/RA3Match
5RC5RC5Match
6RC4RC4Match
7RC3RC3Match
8RC6RC6Match
9RC7RC7Match
10RB7RB7Match
11RB6RB6Match
12RB5RB5Match
13RB4RB4Match
14RC2RC2Match
15RC1RC1Match
16RC0RC0Match
17RA2RA2Match
18RA1/ICSPCLKRA1/ICSPCLK/ICDCLKMatch
19RA0/ICSPDATRA0/ICSPDAT/ICDDATMatch
20VSSVSSMatch
Symbol mismatches and quality issues
  1. Pin 4 electrical type is incorrect. RA3 is the device's input-only GPIO (with MCLR/VPP functions), but the terminal is marked Bi-Directional. It should be represented as Input or Programmable rather than bidirectional.
  2. Pin 20 VSS is typed Power In. A dedicated Ground pin type would be more semantically accurate and improve ERC behavior.
  3. Pin descriptions are missing on all terminals. No Pin Description properties are present. At minimum, each pin should describe its primary GPIO/power role; detailed alternate-function descriptions would substantially improve searchability and usability.
  4. Alternate-function labels are incomplete. The primary names and programming functions are sufficient for basic use, but RA4/RA5 oscillator labels and most peripheral alternate functions are omitted. Because the MCU uses Peripheral Pin Select, listing every peripheral on the symbol may be undesirable; concise descriptions are preferable.
  5. The rendered symbol otherwise has the correct number of terminals and correct package pin numbering.
Footprint audit
The footprint is a 20-pin through-hole DIP with:
  • 2.54 mm pin pitch — matches the datasheet's 0.100-inch basic pitch.
  • Approximately 7.938 mm row spacing — suitable for the 300 mil PDIP family and within the package envelope.
  • 20 numbered plated through-hole pads with rectangular pin 1 marker — correct topology and orientation.
  • Fabrication body approximately 6.604 mm wide by 25.908 mm long — consistent with the datasheet nominal molded body dimensions of 6.35 mm width and 26.162 mm length.
  • 0.83 mm drills and 1.338 mm copper pads — plausible IPC-style lands for the specified lead dimensions.
No pad-number or pin-to-pad mapping mismatch was found. The footprint asset name (DIP793W45P254L2590H533Q20) and project description are cryptic; the package should be clearly identified in properties as PDIP-20, 300 mil, 2.54 mm pitch.
  1. Change the MPN property to canonical PIC16F18446-E/P while retaining the URL-safe project slug/name if required.
  2. Change Part Type to Microcontroller.
  3. Replace the description with: 8-bit PIC microcontroller, 28 KB Flash, 2 KB RAM, 12-bit ADC, 32 MHz, 2.3-5.5 V, extended temperature, PDIP-20.
  4. Add package metadata: PDIP-20, 300 mil (7.62 mm nominal row spacing), 2.54 mm pitch.
  5. Change pin 4 from Bi-Directional to Input/Programmable and pin 20 from Power In to Ground.
  6. Add meaningful pin descriptions for all 20 terminals.
Sources
  • Microchip Technology, PIC16(L)F18426/46 Data Sheet, DS40001985C, device overview, 20-pin diagram/allocation table, packaging diagrams, and product identification system.
  • Current Flux part metadata, rendered symbol terminal table, and footprint geometry inspected on 2026-08-21.

  • Result

  • Current metadata

  • Ordering-code interpretation

  • Key specifications

  • Symbol and pin audit

  • Symbol mismatches and quality issues

  • Footprint audit

  • Recommended corrections

  • Sources