Who This is For (And Why You Should Care)
If you've ever approved a purchase order for Kemet ceramic capacitors or any passive components, then watched the final invoice mysteriously inflate by 10-15%... you know the feeling.
This checklist is for the person who signs the POs and wants to know where the money actually goes.
Over the past 6 years, I've tracked every invoice for our component orders (about $180k in cumulative spend). I've negotiated with over 20 vendors. And I've built a personal audit checklist that catches about 85% of the cost leaks before they hit the PO.
Here are the 6 steps I run through every single time.
Step 1: The "What's NOT Included" List
Before you even look at the unit price of that Kemet Yageo capacitor, ask this: "What's NOT included in this quote?"
The conventional wisdom is to compare unit prices. My experience with 200+ orders suggests that's a trap. The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end.
What to ask for:
- Shipping & handling – Is it FOB origin or destination?
- Minimum order charges – Some vendors hit you with a $50 'small order fee' if you're under $200.
- Testing & certification fees – If you need a certificate of conformance, is it extra?
I only believed this after ignoring it once. We ordered a batch of clear phone components from a new vendor. The 'cheap' quote ended up costing 30% more than the 'expensive' one once we added the $120 testing fee we hadn't seen.
Step 2: Cost Per Unit, Not Price Per Unit
Everyone talks about 'unit price.' The person who saves the company money calculates cost per unit of function.
For a Kemet ceramic capacitor, the unit price might be $0.15. But if that capacitor fails in 10% of your prototypes, the effective cost soars. Here's how I break it down:
- Unit price: $0.15
- Expected yield loss: 2% vs. 8% for a cheaper alternative
- Real cost per good unit: $0.153 vs. $0.163
Personally, I'd rather pay $0.15 for a part that works than $0.10 for one that causes a board re-spin. The math on that is brutal.
Step 3: The "Expiry Date" Check
This is the step most people ignore. Does your component have a shelf life?
I want to say that most passive components are shelf stable, but don't quote me on that. Some microwave components or specific Kemet series (like certain tantalums) have storage limitations. Check the datasheet.
According to IPC/JEDEC J-STD-033, moisture-sensitive devices have specific floor life limits. If your vendor ships a batch that's already been on the shelf for 18 months, and you only need 6 months of floor life... you're eating the cost.
Step 4: Quantity Breaks & The $800 Mistake
Everyone tells you to order in bulk. But I learned the hard way: quantity breaks aren't always linear.
Here's what happened. We needed 200 units of a Kemet Yageo capacitor. The price break was:
- 1-99 units: $0.22 each
- 100-499 units: $0.18 each
We ordered 100 units. Total: $18.00.
But we only needed 80 for the project. The remaining 20 sat in inventory for 2 years, eating carrying cost. That 'deal' cost us about $12 in storage over time, plus the $0.04/unit we 'saved' ended up being a net loss.
Always calculate the total cost of the entire batch, not just the per-unit savings.
Step 5: The ROI of A Premium Supplier
People assume the lowest quote means the vendor is more efficient. What they don't see is which costs are being hidden or deferred. I've found that paying a slight premium (5-10%) for a vendor that:
- Has a dedicated account manager
- Provides real-time inventory reporting
- Offers free sample packs for prototyping
...almost always saves you money in the long run. The time spent chasing down discrepancies or waiting for quotes from a 'cheap' vendor is a hidden cost that's hard to quantify but very real.
In my experience, it's worth paying $1,500 for a reliable vendor on a $18,000 order, even if a cheaper alternative quotes $1,400. The reliability is worth the $100.
Step 6: The "Surprise Fee" Red Flag List
Finally, here's my red flag list. If you see any of these in a vendor's terms, ask for a revised quote:
- "Setup Fee" – especially for a repeat order.
- "Expedite Fee" – unless you asked for rush delivery.
- "Handling Charge" – a percentage of the total order.
To be fair, some fees are legitimate. Rush orders often require completely different workflows. But if the fee isn't clearly tied to a service you requested, it's probably just a margin grab.
Granted, this checklist requires more upfront work. But it saves time later. In Q3 2024 alone, running through these steps saved us about $3,200 on a single batch of Kemet components.
Final Thought: Trust the Math, Not the Relationship
The way I see it, a good vendor relationship is built on transparency, not on a 'good price.' The vendor who lists all fees upfront—even if the total looks higher—is the one I trust.
That said, I've been burned by the 'transparent' one who forgot to mention the shipping fee. So, always double-check. Trust the math, not the relationship.
