Quectel EC25 vs. 5G vs. LTE-M: A Cost Controller’s Honest Comparison After the Chip Shortage

In 2023, I was sitting in a meeting with a vendor who kept telling me their LTE module was '50% cheaper' than our current Quectel EC25 stock. I pulled up our cost tracking spreadsheet—we've managed about $180,000 in cumulative spending across 6 years—and showed the team the actual cost per board. Cheap module unit price: $31. Quectel EC25: $44. But once we added the required antenna redesign, a separate GPS receiver, a new tooling run, and the three weeks of engineering time, the 'cheap' module cost us $1,400 more in rework alone. That's when I stopped comparing unit prices and started comparing outcomes.

This is a comparison of Quectel's three most popular cellular module families: the Quectel EC25, which sits in the LTE Category 4 speed tier; the 5G modules like the RM520N-GL; and the LTE-M/NB-IoT modules like the BG95. I'll also get into Quectel antennas, because that's where a lot of hidden costs live. No sponsor told me to write this—I'm just a procurement person who hates paying twice.

The last few years—especially the chip shortage between 2021 and 2023—taught me that the cheapest module on the BOM is not the cheapest module on the P&L.

How I'm Comparing: Total Cost of Ownership, Not Price per Unit

I'm going to compare these modules across six dimensions: unit cost, integration cost, speed/application fit, antenna requirements, supply chain certainty, and engineering support. If you're also deciding between LTE Cat 4 and 5G for a new design, these are the questions that matter.

1. Unit Cost vs. Total Cost: The EC25's Quiet Advantage

As of our Q4 2024 quotes, the Quectel EC25 LTE Category 4 module was running around $44–58 per unit in medium volumes. The Quectel RM520N-GL 5G module was around $170–210. The BG95 LTE-M/NB-IoT module was in the $25–32 range. Those are real quotes from our distributor, not marketing numbers. Prices have been moving as the chip shortage eases, so verify current pricing—or rather, get a quote, because the price we paid in December may not mean anything in March.

But here's what surprised me. On paper, the 5G module is 'worth' the higher cost for future-proofing. On a real IoT product—say a remote monitoring gateway that sends a few MB per day—5G speed is wasted. The EC25's 150 Mbps downlink is already overkill. What you pay for with 5G is bandwidth you might never use, plus a much harder RF layout. That's a different kind of cost: engineering time, antenna tuning, PCB stackup changes, and thermal management. I'd rather take the EC25 and spend the saved budget on a better enclosure or warranty.

2. Antenna Choice: Quectel Antennas vs. Generic Wholesale Parts

Here's an area where I've learned the hard way. We once specified a generic antenna from a marketplace to save $6 per unit. A multimeter showed the antenna cable had continuity, SWR looked acceptable in the lab, and everything seemed fine. At the first field test, the GPS fix time doubled and throughput dropped. The problem wasn't the connector—it was the antenna's tuning. A multimeter can only tell you the cable isn't broken; it can't tell you if the radiating element is matched to the bands you need.

Now, I'm not saying every generic antenna is garbage. But when a vendor can't provide a matching antenna for a Quectel EC25 or Quectel 5G module with documented return loss, you're accepting the risk. Quectel antennas are not always the cheapest option upfront. Our average cost for a Quectel antenna was $4–12 depending on type. A no-name antenna was $2–5. The difference per unit was small; the cost of a six-hour troubleshooting session in the field was not. Actually, that session was closer to ten hours if you count the drive and the follow-up email chains.

3. The CVS Blood Pressure Monitor Test

Every time an engineer asks me 'why can't we just use a cheaper module?', I ask them to think about a CVS blood pressure monitor. You can buy a $20 wrist cuff that gives you a reading. Or you can buy an arm cuff with a clinical validation study behind it. If you're checking your blood pressure once a month just for fun, the wrist cuff is fine. If your doctor is adjusting your medication based on the numbers, you want the cuff that's proven accurate. Modules work the same way. The EC25 is a proven, mature LTE Cat 4 platform. A 5G module is valuable when the application truly demands it. A cheap module with limited documentation is fine for a weekend prototype—not for a product that triggers recalls.

4. Chip Shortage Reality: Paying for Certainty Is Rational

The chip shortage changed my procurement policy. Before 2021, I'd quote three vendors and go with the lowest. But during the shortage, I saw lead times on LTE modules stretch from 8 weeks to 32 weeks. A module we built our product around went on allocation, and the distributor couldn't give us a guaranteed date. That's where I learned the value of what I call a 'time certainty premium.'

In March 2022, we paid a 14% premium to secure a batch of 5,000 Quectel EC25 modules with a confirmed delivery window. A colleague called it unnecessary. But we had a customer contract that carried a $15,000 penalty for late delivery. That $7,000 premium was the cheapest insurance we ever bought. The alternative—'we'll get you modules when they arrive'—could have cost us more than double the premium plus a damaged relationship.

Per FTC guidelines (ftc.gov), advertising claims need to be truthful and substantiated. I apply that same logic to distributors: when they say 'we have stock,' I ask for a warehouse allocation letter. During the chip shortage, we saw multiple cases of 'in stock' that really meant 'we can try to find some on the open market.' That's not a sourcing strategy; that's gambling with a customer deadline.

5. Support and Ecosystem: The Hidden Integration Costs

Quectel's EC25 is not the smartest module on the market, but it has the biggest ecosystem. There is a reason it's so popular in industrial routers and telematics. The reference design is well-documented, the Linux driver is stable, and when we have a bug, Quectel's support engineers can usually reproduce it with our exact module version. That saved us at least two weeks on a custom board bring-up last year.

With the 5G modules, support is better than it was two years ago, but the RF design is genuinely harder. If you don't have an RF engineer with 5G layout experience, budget for an external design review. That can cost $2,000–6,000 per project. On a 1,000-board run, that's $2–6 per module. Add that to the unit price difference, and the 5G module's TCO gets even higher.

The BG95's strengths are battery life and low data rate, but its biggest cost trap is global certification. Every carrier requires various tests, and the profile for LTE-M/NB-IoT is less standardized than LTE Cat 4. If you only need North American networks, fine. If you're shipping globally, the EC25's better certification track record matters.

6. Comparing Frequency Bands and Power Requirements

This is the dimension too many spec sheets ignore. The EC25 covers a wide set of LTE bands in one SKU, and that simplifies inventory. The 5G RM520N-GL is also designed for global bands, but the power draw is higher. We measured a 5G module's peak current during a sustained speed test—it was about 30–40% higher than the EC25's peak. That's a cost if your product is line-powered; it's a big deal if you're battery-powered.

And on the subject of testing: keep a multimeter on your bench. We've caught more broken boards with a simple continuity check than with expensive analyzers. A multimeter won't tell you if a module is actually transmitting, but it will tell you if your power rail is live, if your ground is solid, and if the antenna connector's center pin is properly seated. That's the first step before you blame the module.

So Which Quectel Module Should You Choose?

If your project needs a reliable LTE connection and you don't have a reason for 5G, the Quectel EC25 is still my default recommendation. It's the workhorse. The LTE Category 4 speed is enough for most industrial IoT use cases, and the total cost of ownership is likely the lowest.

Spec out the Quectel RM520N-GL for a product that genuinely needs multi-gigabit throughput, like a fixed wireless access point or a video-heavy edge device. Only take the BG95 for low-power sensors that will live on a battery for years.

And for antennas, don't skimp on the matching. Whether you choose Quectel antennas or a third-party antenna, get the VSWR measured, bring a multimeter to verify the cable assembly, and make sure the antenna vendor documents tuning specifically for the bands you use.

Bottom Line

The cheapest module is rarely the cheapest product. The chip shortage taught me that delivery uncertainty has a price, and I'd rather budget for certainty than explain to a customer why we missed a deadline.

If you're a startup or a team that hasn't built many hardware products, do yourself a favor: compare Quectel EC25, 5G, and LTE-M modules on a TCO spreadsheet, not just a unit-price list. Include the antenna, the integration hours, the testing time, the certification fees, and the cost of being wrong. I did that after getting burned twice. It saved us about $8,400 in the first year and a ton of stress.