iXBT Labs - Computer Hardware in Detail






Latest News

 « Previous Day News Archive  

What Lies Behind The Sony Battery Recall? Cracked MLCCs Or The Absence Of An NTC Resistor?

Although the major cause of the recent Sony battery recall has not been revealed, passive component makers suspect that cracking of the multi-layer ceramic capacitors (MLCCs) or the inappropriate use of negative temperature coefficient (NTC) resistors caused the batteries to overheat.

Sources at US-based passive component makers commented that overheating may have originated in the electrical insulation of the batteries and that MLCC and other passive components should not be the major cause of the incident.

Some Taiwan-based makers, on the other hand, suspect that the adopted MLCCs had been cracked by printed circuit board (PCB) assembly, and that this may have caused an unstable flow of current, leading eventually to overheating.

Most of the MLCCs that had been found to be cracked had been made using X7R material, and X7R-based MLCCs are widely employed in applications that require a relatively high current.

In order to avoid cracking, some makers introduce a so-called "open mode design," which adjusts the design of the MLCC electrode. The US-based Kemet and Taiwan-based Walsin Technology have both introduced this kind of design.

Some industry players add organic materials to MLCCs, to avoid cracking. They usually term this type of supplementation of organic materials, "soft termination”or "polymer termination." Industry players that include the UK-based Syfer and Avx/Kyocera have introduced this type of solution.

The inappropriate adoption or lack of NTC resistors may also lead to overheating problems, said some Taiwan players. Since NTC resistors play a critical role in terminating the power supply, when overheating is detected, the inappropriate use or lack of NTC resistors may also have the effect of causing overheating.

Source: DigiTimes

 « Previous Day News Archive  

Latest headlines

ASUS Launches R9 200, R7 200 Series, Matrix R9 280X Graphics Cards

Apacer Launches SATA SLC-lite SSD solutions

ADATA Introduces a Stylish External HDD HC630

Samsung Introduces New Wireless Multiroom Speakers

WD Gives Consumers a Cloud of Their Own

Write a comment below. No registration needed!

blog comments powered by Disqus

  Most Popular Reviews More    RSS  

AMD Phenom II X4 955, Phenom II X4 960T, Phenom II X6 1075T, and Intel Pentium G2120, Core i3-3220, Core i5-3330 Processors

Comparing old, cheap solutions from AMD with new, budget offerings from Intel.
February 1, 2013 · Processor Roundups

Inno3D GeForce GTX 670 iChill, Inno3D GeForce GTX 660 Ti Graphics Cards

A couple of mid-range adapters with original cooling systems.
January 30, 2013 · Video cards: NVIDIA GPUs

Creative Sound Blaster X-Fi Surround 5.1

An external X-Fi solution in tests.
September 9, 2008 · Sound Cards

AMD FX-8350 Processor

The first worthwhile Piledriver CPU.
September 11, 2012 · Processors: AMD

Consumed Power, Energy Consumption: Ivy Bridge vs. Sandy Bridge

Trying out the new method.
September 18, 2012 · Processors: Intel
  Latest Reviews More    RSS  

i3DSpeed, September 2013

Retested all graphics cards with the new drivers.
Oct 18, 2013 · 3Digests

i3DSpeed, August 2013

Added new benchmarks: BioShock Infinite and Metro: Last Light.
Sep 06, 2013 · 3Digests

i3DSpeed, July 2013

Added the test results of NVIDIA GeForce GTX 760 and AMD Radeon HD 7730.
Aug 05, 2013 · 3Digests

Gainward GeForce GTX 650 Ti BOOST 2GB Golden Sample Graphics Card

An excellent hybrid of GeForce GTX 650 Ti and GeForce GTX 660.
Jun 24, 2013 · Video cards: NVIDIA GPUs

i3DSpeed, May 2013

Added the test results of NVIDIA GeForce GTX 770/780.
Jun 03, 2013 · 3Digests
  Latest News More    RSS  

Platform  ·  Video  ·  Multimedia  ·  Mobile  ·  Other  ||  About us & Privacy policy  ·  Twitter  ·  Facebook

Copyright © Byrds Research & Publishing, Ltd., 1997–2011. All rights reserved.