Downsizing in practice – why can reducing devices lead to overheating and parameter drift?
Downsizing in practice – why can reducing devices lead to overheating and parameter drift?Date of publication: 23-07-2026 🕒 6 min read
Reducing the size of a device does not always mean merely saving space. In practice, every millimeter less on a PCB increases power density, making heat dissipation more difficult and placing higher demands on passive components. Even if the device meets all functional assumptions, the rise in temperature can cause parameter drift, worsen power supply efficiency, and in the long term also shorten component lifespan.
That is why downsizing today requires more than just using smaller housings. Equally important is the selection of passive components that maintain stable parameters during many years of operation at elevated temperatures. In this article, we will look at products from the Panasonic brand, which address these design needs.
Resistors – small dimensions cannot mean compromises
One of the first components to feel the effects of downsizing are resistors. In compact devices, they are exposed both to self-heating resulting from power dissipation and to elevated ambient temperature.
Panasonic’s portfolio includes over 13,000 SMD resistors, dominated by thick film and thin film constructions. This allows choosing solutions both for typical applications and for precision analog circuits.
In projects requiring high accuracy, it is worth paying attention to models offering tolerances of up to ±0.05% and a temperature coefficient TCR starting from 10ppm/°C. The wide choice of packages also allows matching the component to both spatial constraints and heat dissipation requirements.
ERA2AEB series resistors are available with resistance from 47Ω to 100kΩ.
NTC Thermistors – temperature control starts with reliable measurement
One of the most effective ways to limit problems caused by downsizing is ongoing temperature monitoring in areas most prone to overheating.
Thermistors have a tolerance of ±3% or ±5%.
Panasonic NTC thermistors for surface mounting are available in small 0201, 0402, and 0603 enclosures, allowing them to be placed directly near elements generating the most heat.
The TME catalog offers models with resistances from 6.8kΩ to 100kΩ, with a material constant B in the range 3380...4700K, intended for operation in temperatures from -40°C to 125°C. Such a wide selection facilitates matching the sensor’s characteristics to the requirements of a specific application and allows effective temperature monitoring both in industrial devices and consumer electronics.
Capacitors – system stability starts with proper energy storage
The effects of downsizing are also particularly visible in power supply circuits. Capacitors are responsible not only for energy storage and voltage filtering but also for maintaining their parameters during operation at elevated temperatures, as an increase in ESR resistance or changes in capacitance can reduce the efficiency of the entire circuit.
The TME catalog includes over 10,000 Panasonic capacitors of various types. These include electrolytic, hybrid, polymer, and film constructions, available both as SMD and THT versions.
Such a broad offer facilitates component selection for applications with diverse requirements. Depending on the series, models designed to operate at temperatures up to 125°C are also available, which is especially important in designs with high power density.
Hybrid capacitors find wide use in modern applications.
Inductors – high efficiency despite limited space
Increasing power density means that downsizing places ever greater demands on power supply circuits. Inductors have a key impact on the efficiency of switching converters and must maintain their properties despite high temperature and large operating currents.
Panasonic inductors have a tolerance of ±20%.
The offer includes inductors designed for SMD mounting. These are wire-wound constructions with inductances from 0.19µH to 0.1mH, adapted to operate with working currents reaching several amperes. Depending on the series, components can operate at temperatures up to 150°C, and selected models meet the AEC-Q200 standard.
The wide range of parameters allows optimizing the power supply circuit in terms of both efficiency and occupied space, helping to reduce energy losses and heat emission.
EMI Filters and Varistors – invisible protection
The range of Panasonic passive components is complemented by EMI filters and varistors, responsible for protecting devices against electromagnetic disturbances and surges. For designers focusing on downsizing, their importance grows with the increasing density of component placement and the rising sensitivity of electronic circuits to interference.
The TME catalog offers SMD EMI filters designed for use in circuits powered by 5V DC, whose compact dimensions facilitate integration with modern devices.
A much wider group of products is formed by Panasonic varistors, available both as SMD and THT versions. They include ceramic, metal-oxide, and zinc oxide models, allowing the component to be matched to the requirements of a specific application and the expected level of surge protection.
Properly selected EMI filters and varistors increase device resistance to electromagnetic interference and surge impulses, constituting an important complement to other passive components used in modern electronic designs.
Varistors come with lead pitches of 5mm or 7.5mm.
Summary
Miniaturization will continue, so selecting passive components becomes one of the key stages of designing modern electronics. Properly selected resistors, capacitors, inductors, and protective elements help limit the effects of rising temperature and maintain stable parameters even in very compact designs. Panasonic’s wide portfolio of components available at TME allows choosing solutions tailored to the requirements of both simple electronic devices and advanced industrial applications.
