Two-Resistor thermal model

The Two-Resistor thermal model connects the electronic component to the PCB using the JEDEC two-resistor model. The solver:

• Creates an internal lumped mass at the center of the electronic component that represents the junction.

• Creates an internal thermal load and applies it to the lump mass.

• Creates an internal null mesh between the component and the mounting region. The null mesh has the same geometry as the mounting region.

The software can report the temperature of every element on the component mesh, or a single merged temperature. According to the option you choose, the results are calculated as follows:

Variable component temperature

The solver:

• Creates an internal thermal coupling that models the resistance, ΘJC, between the junction and the component region. You specify the resistance value.

• Creates an internal thermal coupling that models the resistance, ΘJB, that you set between the junction and the mounting region. You specify the resistance value.

Single component temperature

The solver:

• Creates an internal thermal coupling that models the resistance, ΘJC, between the case and the junction. You specify the resistance value.

• Creates an internal thermal coupling that models the resistance, ΘJB, between the junction and the null mesh. You specify the resistance value.

• Creates an internal merged thermal coupling that connects the null mesh and the mounting region.

• Internally merges all the component elements to calculate a single temperature across the whole component region.

Variable component temperature example	Single component temperature example

	Component region		Thermal coupling		Load
	Mounting region		Merge set		Copied null mesh
	Lump mass

How do I

Connect a component to a PCB

Modify the component catalog XML file

Learn more

Inputs to expressions

Thermal Coupling

Merge Set

Printed Circuit Board

Track During Solve report

Report

Look up more details

Zero-Resistor thermal model

One-Resistor thermal model

PCB Component catalog

Sample PCB component catalog file in a spreadsheet application

Auto-generated expressions

PCB Component dialog box

Quick links

Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions

Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Related Topics

Component naming and numbering

Component mesh creation and coupling

PCB Exchange Preferences dialog box – Components tab

Thermal Solution

Two-Resistor thermal model, Simcenter 3D 2021.1 Series

© 2020 Siemens

window.mainLanguage="en_US"

window.delivId=""

window.projectId=""

MathJax.Hub.Config({ TeX: { extensions: ["autoload-all.js"] }, tex2jax: { displayMath: [ ] }, "SVG": { scale: 125 } });