In the quiet arithmetic of miniaturization, Murata Manufacturing has reached a new threshold — a temperature-sensing component so small it could sit comfortably on a grain of sand, yet precise enough to guard the delicate thermal balance of the devices we carry closest to our bodies. The NCU01 thermistor, measuring just 0.25 by 0.125 millimeters, answers a question that has long troubled electronics designers: how do you keep watch over heat in a space that barely exists? It is a reminder that the most consequential advances are often invisible — not the devices we hold, but the infinitesimal
Murata Unveils World's Smallest NTC Thermistor for Next-Gen Device Cooling
A sensor placed closer to heat finally catches what's actually happening
Mark
So this is just a smaller thermistor. Why does that matter enough to announce?
Mimi
It's smaller, yes, but the constraint is real. In a smartphone, you have a processor generating heat, a battery doing the same, and nowhere to put a temperature sensor that's close enough to measure accurately. This component solves that.
Luke
But how much does proximity actually improve thermal management? The press release says it reduces temperature difference and detection delay, but those are vague claims. Do we have numbers on how much faster the response is?
Mimi
The release doesn't quantify that. It's more about enabling the placement—making it physically possible to put a sensor where it couldn't go before.
Mark
And they're maintaining the same precision tolerances even though it's 60 percent smaller. That seems like the harder part of the story.
Mimi
Exactly. Miniaturization usually means you lose precision. Murata kept it. That's the engineering achievement.
Luke
Though we should note that ±1 percent tolerance is their claim based on their research. We don't have independent verification, and we don't know how that tolerance holds up in real-world production at scale.
Mark
When does it actually reach devices?
Mimi
Samples start shipping now, in October 2026. Mass production begins in 2027. So we're probably looking at 2027 or 2028 before these show up in consumer phones.
Luke
And they're starting with just two resistance values—100k and 10k ohms. The lineup is incomplete. This is the beginning of the product cycle, not the end.
Mark
So what's the real impact here?
Mimi
It's incremental but cumulative. Every component gets smaller. Every component gets closer to where it needs to be. The device gets smarter about managing its own heat. Over time, that adds up to better performance and longer battery life.
Luke
If it works as advertised and if manufacturers actually use it in those tight spaces instead of just leaving room for future upgrades.
Le Pouls
- Modern electronics have grown so dense that temperature sensors can no longer reach the heat sources they are meant to monitor, leaving thermal management systems flying partially blind.
- Murata's NCU01 series breaks through this spatial barrier by shrinking 60% beyond its predecessor, opening circuit board real estate that was previously inaccessible to sensing components.
- The deeper engineering tension was not size alone — maintaining ±1% resistance and B-constant tolerances at this scale demanded advances in ceramic materials and high-precision manufacturing that do not come easily.
- Sample shipments begin October 2026, with mass production targeting 2027, initially serving the smartphone and wearable markets where thermal risk is highest and board space most contested.
- Each incremental reduction in component size compounds across thousands of parts in a single device, quietly accumulating into the technological leaps consumers experience as thinner phones and longer-lasting wearables.
In the quiet arithmetic of miniaturization, Murata Manufacturing has reached a new threshold — a temperature-sensing component so small it could sit comfortably on a grain of sand, yet precise enough to guard the delicate thermal balance of the devices we carry closest to our bodies. The NCU01 thermistor, measuring just 0.25 by 0.125 millimeters, answers a question that has long troubled electronics designers: how do you keep watch over heat in a space that barely exists? It is a reminder that the most consequential advances are often invisible — not the devices we hold, but the infinitesimal components that make holding them safely possible.
Murata Manufacturing has announced what it describes as the world's smallest negative-temperature-coefficient thermistor — the NCU01 series — measuring just 0.25 millimeters by 0.125 millimeters. The component addresses a persistent frustration in electronics design: as smartphones, smartwatches, and portable devices grow more powerful, their circuit boards grow more crowded, leaving little room to place the temperature sensors that protect processors and batteries from dangerous heat buildup.
Proximity is everything in thermal sensing. A sensor placed far from a heat source reads temperatures that lag behind reality, giving a device's thermal management system outdated information precisely when it matters most. By shrinking 60% compared to Murata's previous smallest thermistor, the NCU01 allows engineers to position sensors in spaces that were simply unavailable before — closer to the action, faster to respond.
The engineering challenge was not miniaturization alone but miniaturization without sacrifice. Thermistors must change resistance in predictable, consistent ways to be useful. Murata claims the NCU01 preserves the same ±1% resistance and B-constant tolerances as its larger predecessor, achieved through proprietary ceramic technology and precision manufacturing processes.
Sample shipments are planned for October 2026, with mass production following in 2027. Initial offerings will cover 100kΩ and 10kΩ resistance values, targeting smartphones, wearables, and the compact system-in-package modules that increasingly define modern electronics. For Murata, the NCU01 is one more step in a long strategy of incremental miniaturization — the kind where no single advance seems revolutionary, but the cumulative effect is the pocket-sized computer that would have seemed impossible not long ago.
Murata Manufacturing has completed work on what it says is the world's smallest negative-temperature-coefficient thermistor—a component so compact it measures just 0.25 millimeters by 0.125 millimeters. The company calls the new device the NCU01 series, and it represents a significant step forward in solving a problem that has plagued electronics designers for years: how to fit temperature sensors into devices that are themselves shrinking.
The challenge is straightforward in concept but difficult in execution. Modern smartphones, smartwatches, and other portable electronics pack more processing power and functionality into tighter spaces than ever before. Circuit boards are crowded. Components sit shoulder to shoulder. When you need to monitor the temperature of a processor or battery to prevent overheating, you want that sensor as close as possible to the heat source. But there is nowhere to put it. The NCU01 solves this by being roughly 60 percent smaller than Murata's previous smallest thermistor, which measured 0.4 millimeters by 0.2 millimeters. That reduction in footprint means engineers can finally position temperature sensors in spaces that were previously off-limits.
Why does proximity matter? Temperature readings are only useful if they reflect what is actually happening at the component being monitored. When a thermistor sits far from the heat source, the measured temperature lags behind reality. If a processor suddenly generates a spike in heat, a distant sensor might not catch it quickly enough. The device's thermal management system—the software and hardware that prevent overheating—operates on stale information. By placing the NCU01 closer to the action, designers can get faster, more accurate readings and respond more quickly to thermal events.
The real difficulty in making something this small is maintaining precision. Thermistors work by changing their electrical resistance in response to temperature changes. For a thermistor to be useful in a device, that resistance must be predictable and consistent. Murata's previous generation maintained a resistance tolerance of plus or minus 1 percent and a B-constant tolerance—a measure of how the component responds across a temperature range—of plus or minus 1 percent. Shrinking the component by 60 percent while keeping those tolerances tight required advances in ceramic materials, manufacturing processes, and component design. Murata says it has achieved this through proprietary ceramic technology and high-precision processing.
The company plans to begin shipping samples in October 2026, with full mass production starting in 2027. The initial lineup will include thermistors with resistance values of 100 kilohms and 10 kilohms, with additional options to follow. The primary markets are smartphones and wearable devices, where the density of components and the heat generated by processors and batteries make thermal management increasingly critical. The NCU01 will also find use inside integrated circuit packages and system-in-package modules—the complex, multi-layered assemblies that pack entire systems into a space smaller than a postage stamp.
For Murata, this is part of a broader strategy. The company manufactures ceramic-based passive electronic components and has positioned itself as a leader in miniaturization and high-density module design. Each generation of smaller, more capable components enables the next generation of smaller, more capable devices. A thermistor that is 60 percent smaller does not sound revolutionary until you consider that it is one of thousands of components in a modern smartphone, each of which has been miniaturized in similar increments. The cumulative effect is the pocket-sized computer that would have seemed like science fiction a generation ago.
Citations marquantes
By reducing the mounting area by approximately 60%, the NCU01 can be placed in locations that are difficult to accommodate with larger thermistors, including closer to heat-generating components.— Murata Manufacturing
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