Every reel, tray or tube of components carries labels. Those labels show when the parts were made and where they came from. Here is how to read them, and what to ask.
What a date code means
A date code shows when the parts were made or packed. Many manufacturers use a four-digit year and week. For example, 2415 means week 15 of 2024.
1 Year: 24 means 2024. 2 Week: 15 means week 15. Formats vary by manufacturer.
Formats vary by manufacturer. Some use letters or shorter codes. Check the manufacturer's marking guide when in doubt.
Lot codes and labels
A lot code links the parts to a production batch. The manufacturer can use it to trace materials and test history.
Factory labels usually show the part number, quantity, date code and lot code. Many add a barcode with the same data.
A sample reel label. 1 Part number (P/N). 2 Quantity (QTY). 3 Date code (D/C). 4 Lot code (LOT). The barcode holds the same data. Example data.
Is an older date code a problem?
Not always. Parts stored well can stay usable for years. How they were stored matters more than their age.
- Moisture-sensitive parts should be in sealed moisture barrier bags.
- Leads should be free of corrosion and damage.
- The packaging should match the manufacturer's original style.
1 Sealed moisture barrier bag. 2 Clean leads, with no corrosion or damage. 3 Original factory packaging and labels.
Some buyers set a date code limit, such as "two years or newer". Agree on this before you order.
Questions to ask your supplier
- What is the date code? Is the lot a single code or mixed?
- Is the stock in original factory packaging?
- Can you send photos of the labels and the parts?
- Where did the stock come from?
- How has it been stored?
Clear answers make a lot easier to approve. Vague answers are a reason to slow down.
Keep the labels on file
When parts arrive, photograph the labels and file the photos with the order. If a problem appears later, you can trace which lot was used.
What our quotes include
Our quotes state the date code and packaging for each line. Ask us for label photos before you order.
