Part Datasheet Review and Update

flux

I reviewed the current part project against the available datasheet source and project data.
Summary

Table

AreaStatusNotes
MPNGoodLTD-5521AE matches the datasheet.
ManufacturerGoodLite-On Technology Corporation matches.
Datasheet URL propertyPresent, but not idealA Datasheet URL is already set, so there’s nothing to add. However, the current value is a Mouser product page, not the direct datasheet PDF. The linked PDF I found is PDF.
Package / pin countMostly goodDatasheet indicates 18 leads, dual-digit 0.56 in seven-segment LED display, common anode. Your project has 18 terminal components and 18 pads.
DescriptionNeeds improvementCurrent description is usable but not very specific. A better library-style description would be: Dual-digit 0.56 in common-anode seven-segment LED display, red-orange, right-hand decimal, 18-pin DIP.
Symbol pin numberingGoodThe project’s terminal pin numbers match the datasheet pinout.
Terminal namingMismatch foundPins 13 and 14 are labeled as CATHODE_ANODE, but the datasheet says they are COMMON ANODE pins.
Pin typesIncompleteAll terminal components currently have Pin Type = Unspecified.
Pin descriptionsMissingI do not see pin descriptions populated on the terminals.
FootprintPartial check onlyThe footprint has 18 pads, which is consistent, but the exposed layout data did not include enough geometry detail to verify pad pitch/body outline against the datasheet dimensions.
Key datasheet specs

Table

SpecValue
Device typeDual-digit seven-segment LED display
ConfigurationCommon anode
Digit height0.56 in / 14.22 mm
ColorRed-orange
DecimalRight-hand decimal
Pin count18
Forward voltage2.0 V min, 2.6 V max at 20 mA
Continuous forward current25 mA max per chip
Peak forward current100 mA max per chip
Power dissipation75 mW max per chip
Peak wavelength630 nm typ
Dominant wavelength621 nm typ
Operating temperature-35°C to +85°C
Pinout cross-check
The pin map in the project matches the datasheet numbering exactly, which is the most important verification step for a part project audit .

Table

PinDatasheet functionProject status
1CATHODE E (DIGIT 1)Match
2CATHODE D (DIGIT 1)Match
3CATHODE C (DIGIT 1)Match
4CATHODE DP (DIGIT 1)Match
5CATHODE E (DIGIT 2)Match
6CATHODE D (DIGIT 2)Match
7CATHODE G (DIGIT 2)Match
8CATHODE C (DIGIT 2)Match
9CATHODE DP (DIGIT 2)Match
10CATHODE B (DIGIT 2)Match
11CATHODE A (DIGIT 2)Match
12CATHODE F (DIGIT 2)Match
13COMMON ANODE (DIGIT 2)Name mismatch in project
14COMMON ANODE (DIGIT 1)Name mismatch in project
15CATHODE B (DIGIT 1)Match
16CATHODE A (DIGIT 1)Match
17CATHODE G (DIGIT 1)Match
18CATHODE F (DIGIT 1)Match
Main mismatches / gaps
  • Pin 13 should be COMMON ANODE (DIGIT 2), not CATHODE_ANODE_(DIGIT_2).
  • Pin 14 should be COMMON ANODE (DIGIT 1), not CATHODE_ANODE_(DIGIT_1).
  • All 18 terminals still have Pin Type = Unspecified.
  • Pin Description fields appear to be missing.
  • Package or Case Code is not present in the project properties.
  • The current Datasheet URL is set, but it points to a distributor product page instead of the datasheet PDF. The review workflow recommends verifying that this property points to the canonical datasheet PDF when possible .
Recommended property cleanup
For this part, I’d recommend these metadata updates:
  • Keep Manufacturer Part Number = LTD-5521AE
  • Keep Manufacturer Name = Lite-On
  • Keep Designator Prefix = DS
  • Improve Description
  • Add Package or Case Code = 18-DIP or a more exact package string if you want the library entry to be stricter
  • Prefer the direct datasheet PDF URL over the Mouser product page for Datasheet URL
Recommended terminal cleanup
For terminal elements, the best-practice audit flow is to ensure exact pin numbers, correct names, and populated pin metadata such as Pin Type and Pin Description .
For this display, I’d set:
  • Segment cathodes: Pin Type = Passive or Unspecified depending on your symbol conventions
  • Common anodes: Pin Type = Power In
  • Add short pin descriptions like:
    • Segment A cathode, digit 1
    • Segment DP cathode, digit 2
    • Common anode, digit 1
If you want, I can take care of the project-property side of this review next, starting with the datasheet/property cleanup that’s in scope for me.
Sign up to send

Files

Pins

Symbol

Layout

3D View

Name
Pin #
Type
Section
Pin Group
Orientation
Order
Sub-symbol
CATHODE_E_(DIGIT_1)
1
Unspecified
CATHODE_D_(DIGIT_1)
2
Unspecified
CATHODE_C_(DIGIT_1)
3
Unspecified
CATHODE_D.P._(DIGIT_1)
4
Unspecified
CATHODE_E_(DIGIT_2)
5
Unspecified
CATHODE_D_(DIGIT_2)
6
Unspecified
CATHODE_G_(DIGIT_2)
7
Unspecified
CATHODE_C_(DIGIT_2)
8
Unspecified
CATHODE_D.P._(DIGIT_2)
9
Unspecified
CATHODE_B_(DIGIT_2)
10
Unspecified
CATHODE_A_(DIGIT_2)
11
Unspecified
CATHODE_F_(DIGIT_2)
12
Unspecified
CATHODE_ANODE_(DIGIT_2)
13
Unspecified
CATHODE_ANODE_(DIGIT_1)
14
Unspecified
CATHODE_B_(DIGIT_1)
15
Unspecified
CATHODE_A_(DIGIT_1)
16
Unspecified
CATHODE_G_(DIGIT_1)
17
Unspecified
CATHODE_F_(DIGIT_1)
18
Unspecified

LTD-5521AE