Connectors are used for one thing: making an electrical connection that survives the real world. In a blood pressure monitor, they carry the pressure sensor's signal to the board. In a network switch, they carry high-speed data between the switch chip and the Ethernet ports. When they work, nobody notices. When they don't, you get a bad reading, a dropped packet, or a field failure.
So here's the short version of what I learned the hard way: If you're buying Samtec parts for anything that will be manufactured, buy from Samtec authorized distributors. Not because the brand is magic and not because every gray-market part is bad. But because connector reliability starts with traceability. I learned that after years of ordering connectors for medical and networking equipment, and after making enough mistakes to fill a binder.
The Bottom Line
Connectors are used for power, signal, and ground. That's the literal answer to what are connectors used for. But the useful answer is more nuanced: connectors are the removable interfaces that let a system survive manufacturing, service, and the physical world. They are not passive pieces of metal.
Seriously, this is way more than a commodity purchase. A connector with slightly too much contact resistance can make a medical sensor drift. A connector with poor impedance control can turn a clean network signal into noise. In my opinion, the connector is usually the first thing to blame and the last thing to inspect. That's why where you buy it matters.
Why I'm the Person Writing This
I work at a contract manufacturer that builds medical devices and network equipment. I'm the person who approves connector orders and, unfortunately, the person who has to explain when those orders go wrong. I've personally made and documented 11 significant mistakes—or rather, 11 that I actually wrote down. They totaled roughly $30,000 in wasted budget.
When I first started, I assumed a part number was enough. If the part number matched and the price was lower, the part should work. Three scrapped boards later, I learned that an identical-looking connector is not necessarily an electrically identical connector.
What Connectors Are Used For: The Non-Boring Version
If you search for what connectors are used for, you'll get a lot of lists. Here's a shorter one:
- Power: connecting a supply to a board, motor, pump, or heater.
- Analog signals: carrying sensor readings from a blood pressure cuff, thermocouple, or strain gauge.
- High-speed data: carrying Ethernet, PCIe, or serial signals between boards and cable assemblies.
- Grounding and shielding: keeping noise where it belongs.
That list sounds dry. The applications aren't. Take a blood pressure monitor: the cuff tube connects to a pressure sensor, and that sensor sits on a small PCB. A connector carries the sensor's signal to the main board. If the connection is intermittent, the software sees a pressure spike that doesn't exist. The monitor alarms. A clinician has to stop, re-fit the cuff, and try again. That's not an abstract connector issue. That's the device losing trust.
Network equipment is another reminder. Ask someone what connectors are used for in networks, and they'll probably say Ethernet ports. But inside a switch, board-to-board connectors route dozens of high-speed lanes between the switch ASIC and the port modules. At 25 to 56 Gbps, the connector's impedance, crosstalk, and shielding matter as much as the PCB layout. The RJ45 jack is only the visible part. The real work is behind it.
Why Samtec Authorized Distributors Won the Argument
Samtec isn't the only connector company I respect. But for the kinds of boards I help build, they behave like connectors are engineering components, not commodities. John Shine, who leads Samtec today, comes from the family that founded the company. I don't mention that for nostalgia. The point is that the engineering-first attitude is consistent from the top down. The company puts design tools, datasheets, and signal-integrity models in front of customers before asking for the order.
More important for procurement: Samtec makes it easy to confirm who is legit. According to Samtec's website, the official way to verify a channel partner is the distributor locator. I do this every time I try a new supplier. It takes two minutes, and it has saved me from at least one bad PO.
One question I always get is why not just buy direct. For most smaller manufacturers, the distributor is the right inventory and support channel. Samtec authorized distributors carry stock, handle credit terms, and have a broader range of parts than the factory wants to ship in small quantities. That's not a secret; it's how the industry works.
And no, an authorized distributor is not just a warehouse with an account. They have a direct agreement with the manufacturer, lot traceability, and a warranty path if something goes wrong. A reseller can have a box of parts that fell out of the legitimate supply chain, but without lot codes and dates, you can't prove anything. That's not a gamble I want on a medical device or a network switch.
Price Is What You Pay; Traceability Is What You Get
I've learned to ask what is NOT included before asking what the price is. The vendor who lists all fees upfront—even if the total looks higher—usually costs less in the end. That goes double for connectors.
One order hurt enough to lock this in. I ordered 600 board-to-board connectors for a production run. The unit price was about $0.80 cheaper than the authorized distributor. I knew I should verify the lot code, but I thought, what are the odds? Well, the odds caught up with us. Boards started failing functional test. It took three days to isolate the cause: inconsistent plating on the contact surfaces. Some connectors worked; some had intermittent connections. The $3,200 order turned into about $8,900 after rework, lost labor, and expedited shipping of replacement parts. (Should mention: that was before I had any checklist.)
The cheaper connector wasn't cheaper. It was a bill that arrived late.
The Checklist I Use Now
After that disaster, I made a pre-order checklist. I still update it. Here's the version that works for me:
- Is the source listed on Samtec's authorized distributor list?
- Can the supplier provide lot codes and date codes before you pay?
- Is the warranty and return policy in writing?
- Does every box match the part number, quantity, and date code on the packing slip?
- Do the top-side markings match the datasheet?
This checklist has caught 47 potential problems in the past 18 months. Most of them were small: wrong quantity, wrong finish, missing lot code. But catching them before they reach the line is the whole job.
When This Advice Doesn't Apply
To be fair, authorized distributors are not the cheapest option up front. They rarely show up at the top of a shopping search. And if you're building a few bench prototypes and don't care about traceability, this whole article is overkill.
But for production boards, medical devices, network infrastructure, or anything that could end up in the field: don't skip the review. Even a good distributor can have a bad day. Check what arrived. Ask difficult questions. And if a supplier gets annoyed when you ask for lot codes, that's a red flag, if you ask me.
Granted, this takes a little more time. That's fine. The extra time costs less than another $8,900 surprise.