Why the open ISA fits IoT better than anything before it
RISC-V matters for IoT devices because it strips the licence and the per-chip royalty out of the silicon, lets designers build exactly the chip a product needs, and now stretches from a coin-cell sensor to a Linux-class edge gateway on a single instruction set.
The economics nobody puts on the slide
Every argument about RISC-V eventually gets dressed up in talk of freedom and open standards. For anyone actually shipping connected hardware, the argument is blunter, and it is about money. IoT lives and dies on the bill of materials. You are not selling one flagship phone at a fat margin, you are selling millions of thermostats, trackers, meters and sensors where a few pennies a unit decides whether the product makes money or quietly loses it.
That is where the open instruction set earns its keep. There is no up-front architecture licence to buy and no per-chip royalty to pay on the ISA itself. For the licensed-IP model and how it stacks up against Arm’s fee-plus-royalty arrangement, see RISC-V vs Arm: What’s the Difference?. The short version is that at IoT volumes, the cost of the architecture stops being a line on the spreadsheet.
A per-chip royalty measured in pennies still adds up to serious money across tens of millions of units. RISC-V removes that line from the bill of materials entirely, which is exactly the sort of thing that matters when your product is a battery and a radio in a plastic box.
One architecture, sensor to gateway
The thing that used to break IoT product lines was fragmentation. A tiny sensor ran one architecture, the gateway that collected its data ran another, and the two camps needed different toolchains, different skills and different suppliers. RISC-V collapses that. The same instruction set now runs across the whole spectrum of IoT devices, from a microcontroller with a few hundred kilobytes of RAM up to an application-class chip running embedded Linux.
This is not theoretical. Espressif’s ESP32-C3 was its first RISC-V microcontroller, and the C5, C6, H2 and P4 parts that followed are all RISC-V cores aimed squarely at connected products, from Wi-Fi and Bluetooth LE up to Wi-Fi 6, Thread and Matter. At the other end of the range sit RISC-V application processors capable of aggregating data and running a gateway workload. When the sensor and the box it reports to share an ISA, moving up and down that range stops being a rewrite. The gateway end of this is covered in RISC-V for IoT Gateways.
Build exactly the chip you need
The second reason RISC-V suits IoT is that the instruction set is modular. You take a small mandatory base and then add only the extensions your product actually uses. A cheap sensor node can strip everything it does not need and stay tiny, cheap and frugal on power. A device doing on-board signal processing or lightweight machine learning can bolt on the extensions that accelerate exactly that work. Nothing is carried as dead weight.
For battery-powered IoT devices, where silicon area and every microamp translate directly into unit cost and field life, that ability to trim and tune is not a nice-to-have. It is the difference between a design that ships and one that gets value-engineered to death. And because the ISA allows custom extensions, a company with a genuinely novel workload can own its silicon differentiation rather than renting it.
What it changes for the people building the hardware
Strip the ideology out and RISC-V is a set of practical shifts for anyone specifying, sourcing or designing connected hardware.
| Concern | Licensed-ISA world | With RISC-V |
|---|---|---|
| Architecture cost | Licence fee plus per-chip royalty | No ISA licence, no ISA royalty |
| Customisation | Fixed instruction set, limited scope | Add only the extensions you use |
| Supplier choice | Tied to one IP vendor’s roadmap | Multiple vendors, same ISA |
| Range coverage | Often different ISAs per tier | Sensor to gateway on one ISA |
| Supply resilience | Single point of dependence | Second-source by design |
The intelligent edge is the whole point
IoT is shifting from devices that merely connect to devices that decide. Instead of shovelling raw data up to a cloud and waiting for an answer, more of the work happens on the device itself: filtering, detecting, inferring, and sending only what matters. That shift arrives at the same moment RISC-V is maturing, which is not a coincidence so much as a convenient collision of timelines.
Analysts have noticed. Omdia has projected that RISC-V-based processor shipments could grow by roughly 50 per cent a year through to 2030, reaching around 17 billion chips and close to a quarter of the total processor market, with edge AI named as a key driver and industrial and embedded uses the largest share. Treat those as forecasts rather than facts. What is on record is that RISC-V International reported the architecture passing roughly 25 per cent market penetration in late 2025, ahead of that schedule. Either way, the direction is not subtle.
Compute is only half of an edge device
A clever RISC-V core sat in a smart sensor is still deaf and dumb until it can get its data home. The intelligent edge is a marriage of compute and connectivity, and the compute story is only worth telling alongside the link. This is where the rest of the cluster comes in. Cellular RedCap is shaping up as the connectivity layer for exactly this class of device, trimming 5G down to something an efficient IoT product can actually justify, and 5G RedCap covers that companion angle in depth. RISC-V does the thinking, RedCap does the talking.
Last updated 19 August 2026. Sources: ESP32-C3, C5, C6, H2 and P4 RISC-V cores per Espressif Systems product documentation; RISC-V shipment growth projections (approximately 50 per cent annual growth, around 17 billion chips and roughly 25 per cent market share by 2030, edge AI as a growth driver) per Omdia (May 2024), stated as forecasts; approximately 25 per cent market penetration reported by RISC-V International, October 2025.
