# What is thermal resistance junction-to-case?

## What is thermal resistance junction-to-case?

Junction-to-Case Thermal Resistance: θ θJC specifies the thermal resistance from junction to the case surface. These two are the thermal resistances from the junction to the case top and bottom surfaces, respectively. The setup for measuring θJC is shown below.

## What is thermal junction?

From Wikipedia, the free encyclopedia. Junction temperature, short for transistor junction temperature, is the highest operating temperature of the actual semiconductor in an electronic device. In operation, it is higher than case temperature and the temperature of the part’s exterior.

How do you find the thermal resistance of a material?

Thermal Resistance (R-Value) As indicated in Equation 2, the value of the thermal resistance can be determined by dividing the thickness with thermal conductivity of the specimen.

What is maximum junction temperature rating?

All semiconductors have some specified safe upper limit for junction temperature (TJ), usually on the order of 150°C (sometimes 175°C).

### What is a good junction temperature?

Operating at up to 110C Junction Temperature during typical gaming usage is expected and within spec,” AMD explains. In essence, the Junction reading represents the hottest part of the GPU.

### What is the difference between case temperature and junction temperature?

TC = Case temperature. This is the temperature of the case of the semiconductor device. TJ = Operating Junction temperature. This is the temperature of the device circuit itself under given operating conditions.

What is maximum case temperature?

In order to calculate your maximum case temperature, first multiply the amount of heat the device dissipates by the junction-to-case thermal resistance to get the temperature rise from junction to case. Then subtract this temperature rise from the maximum junction temperature to get the maximum case temperature.

What is the junction to ambient thermal resistance?

What is the Junction-to-Ambient Thermal Resistance (θJA)? θ JA is defined as the thermal resistance from the junction to ambient temperature. It is a measure of the device’s ability to dissipate heat from the junction to ambient temperature via all heat transfer paths, the sum of copper tracks, vias, and air convention conditions.

## How to evaluate junction temperature properly with thermal?

not present THERMAL METRIC L LMR14030SDDA UNIT R RθJA Junction-to-ambient thermal r 42.5 °C/W R RθJC (top) Junction-to-case (top) therma 56.1 °C/W R RθJB Junction-to-board thermal resista 25.5 °C/W ΨJT Junction-to-top characterization p 9.9 °C/W

## What is the thermal resistance of a heat sink?

If there is a heat sink present, then the heat flow through the heat sink into the air is represented by the sink-to-air thermal resistance, ΘSA. The downward flow of heat from the chip is represented by the two thermal resistances: junction-to-board, ΘJB, and the board-to-air, ΘBA.

What is the definition of Junction to case?

JESD51-1 provides a definition of JC as follows:thermal resistance, junction-to-case: The thermal resistance from the operating portion of a semiconductor device to outside surface of the package (case) closest to the chip mounting area when that same surface is properly heat sunk so as to minimize temperature variation across that surface.