PO #8110: What a Murata SAW Filter 162 MHz AIS Order Taught Me About Sourcing

I still remember the day I sent PO #8110 to Murata Electronics North America, Inc. It looked like a routine order. Three Murata parts: a SAW filter for an AIS receiver, an INR19-66 cell for a battery pack, and a few ESD protection parts. I'd been in the purchasing role for about a year, so I knew enough to place orders—but not yet enough to ask the right questions.

The part that looked right

I work for a marine electronics repair company. We're not a giant operation—maybe 30 employees and 60-80 open orders a year. When I took over purchasing in 2020, I quickly learned that engineers think in part numbers. Suppliers think in part numbers. The person in the middle has to learn that language fast.

One Friday, an engineer put a radio board on my desk. "This AIS receiver came back from a trawler. The front-end filter is dead. Get me a Murata SAW filter, 162 MHz band, for AIS. It's on the approved list."

I searched the term exactly as he described: "Murata SAW filter 162 MHz AIS." There it was. Same brand. Same frequency. Same type. I sent the PO and waited four weeks for delivery.

When the parts arrived, the engineer took one look at the filter and shook his head. "This is a 162 MHz band-pass filter, but it's the wrong package." He pointed at the datasheet. Our board required a Murata part with a different footprint—same family, wrong product. The part number I ordered was compatible with a receiver design we didn't have.

It's tempting to think you can match an electronic component by description. But "Murata SAW filter 162 MHz AIS" describes a family, not an exact part.

The wrong filter ended up in a drawer. The correct one cost $60 plus $180 in overnight freight. My manager didn't yell, but finance did notice. That was the day I stopped ordering from search results and started ordering from datasheets.

The INR19-66 battery that made me trust my gut

The same month, I had to source a Murata INR19 66 for a replacement battery pack. Our normal distributor quoted $38 per cell. A reseller I found online quoted $29 and claimed they had 200 in stock.

The numbers said go with the reseller. My gut said no.

Here's the thing: the photos showed the right label, but there was no lot trace, no country-of-origin certificate, and no lithium battery shipping documentation. When I asked for proof, the seller stopped replying. I went with the distributor. It cost more, but the cell came with a real datasheet and a clear chain of custody. For a battery going into marine equipment—heat, vibration, saltwater—guessing isn't a sourcing strategy.

Where are TVs made?

About a month after PO #8110, my operations manager sent an email with a subject line that read: "where are TVs made?" I almost replied, "Sony makes them in Japan?" But he meant TVS—transient voltage suppressors—on the same Murata order.

Here's what I learned while untangling that question. Murata's ESD protection components are often grouped under the TVS category, but they're not classic silicon TVS diodes. Many of them are ceramic-based ESD suppressors. Where are they made? It depends on the series and date code—Murata manufactures these in Japan, Thailand, and China, and the exact origin can vary by plant.

If you're asking "where are TVs made" for import paperwork or supply-chain risk, don't settle for a brand-level answer. Check the series-level data from the manufacturer or your distributor. That specificity matters.

What PO #8110 taught me

Now, every Murata order goes through a short checklist:

• Exact manufacturer part number, not just a descriptive phrase like "Murata SAW filter 162 MHz AIS."
• Package, footprint, and datasheet verification before I send the PO.
• Authorized distributor or direct manufacturer documentation—especially for batteries like the Murata INR19 66.
• Confirmed country of origin when a customer asks or when compliance needs it.

This approach worked for us because our marine electronics business has predictable ordering patterns. If you're designing a one-off prototype or repairing consumer gear, your sourcing calculus might be different. Your mileage may vary.

Prices mentioned here are from our October 2024 quotes; verify current lead times and availability before you commit.