Kingtronics Blog

The PCB is prone to bending and warping when it passes through the reflow furnace, which makes people very distressed. So how to prevent PCB board from bending and warping through the reflow furnace? Let's explain it to you:

1.Reduce the influence of temperature on PCB stress
Since "temperature" is the main source of plate stress, as long as the temperature of the reflow furnace is reduced or the heating and cooling rate of the plate in the reflow furnace is slowed down, the occurrence of plate bending and plate warping can be greatly reduced. However, there may be other side effects, such as solder short circuit.

2.Use high Tg plate
Tg is the glass transition temperature, that is, the temperature at which the material changes from glass to rubber. The lower the Tg value of the material, the faster the plate begins to soften after entering the reflow furnace, and the longer the time to become soft rubber, the more serious the deformation of the plate. The use of plates with higher Tg can increase their ability to withstand stress and deformation, but the price of materials is relatively high.

3.Increase the thickness of the circuit board
In order to achieve the goal of thinner, many electronic products have left 1.0mm, 0.8mm and even 0.6mm thick plates. It is really a bit difficult to keep the plates from deforming after the reflow furnace. It is suggested that if there is no requirement of thinner, the plates can preferably use 1.6mm thick plates, which can greatly reduce the risk of bending and deformation.

4.Reduce the size of circuit board and the number of panels
Since most of the reflow furnaces use chains to drive the circuit board forward, the larger size of the circuit board will be dented and deformed in the reflow furnace because of its own weight, so try to put the long side of the circuit board on the chain of the reflow furnace as far as possible, which can reduce the dented deformation caused by the weight of the circuit board itself. This is also the reason for the reduction of the number of panels, Try to use the narrow edge perpendicular to the direction of furnace passage to achieve the minimum concave deformation.

5.Used reflow carrier
If the above methods are difficult to achieve, the last is to use the reflow carrier/template to reduce the deformation. The reason why the reflow carrier can reduce the bending and warping of the plate is that the template is expected to hold the circuit board until the temperature of the circuit board is lower than the Tg value and begins to harden again, and can maintain the original size..

If the single-layer template cannot reduce the deformation of the circuit board, it is necessary to add another layer of cover to clamp the circuit board with the upper and lower layers of templates, which can greatly reduce the deformation of the circuit board through the reflow furnace. However, the template is very expensive, and it has to be placed and recycled manually.

6.Use Router instead of V-Cut
Since V-Cut will destroy the structural strength of the panels between the circuit boards, try not to use the sub-panels of V-Cut or reduce the depth of V-Cut.

Kingtronics Components to use on your board:
GKT-Aluminum Electrolytic Capacitors, radial, axial, SMD, snap-in, Lug, screw types
Bridge Rectifiers: MB1S-MB10S, KBPC6005-KBPC610, KBP2005-KBP210
Diodes & Transistors: M7, 1N4007, LL4148, BZV55C, Fast Recovery Diodes
DKT-Super Capacitors: 2.7V, 3V Radial, Snap-in, Screw Type and 5.5V Coin Type
MLCC and Tancap: Multilayer Ceramic Capacitors and Tantalum Capacitors
KKT-Ceramic Capacitors: SMD 3mm Trimmer Capacitor 3pF, 6pF,10pF, 20pF, 30pF
RKT-Trimming Potentiometers: Rectangular, SMD, Square 3006, 3362, 3386, 3590
QKT-Crystals: Crystals and Oscillators size 1612 to 7050,Tuning Fork 32.768KHz
SKT-Surge Arresters: Axial and SMD Gas 2-Electrode and 3-Electrode Arresters
NKT-NTC Thermistors: NTC Negative Temperature Coefficient Thermistor
XKT-Varistors: Metal Oxide Varistor 05D, 07D, 10D, 14D, 20D
WKT-Switches: DIP and SMD Tact Switches
FKT-Film Capacitors: Metallized Polyester and Polypropylene Film Capacitor

Kingtronics team is committed to helping our customers to cost down.
We are delighted to inform that we have better support for some values of our super capacitors now.
Please don’t hesitate to contact us to enjoy our latest best prices !

Kingtronics (Kt) Super Capacitors Features
Standard coin-type, Radial type, Snap-in type, Screw Type terminals
Small-sized, large capacity
High energy and high power
Low ESR
Pb-free and RoHS compliant

Kingtronics (Kt) Super Capacitors Applications
RAM, Detonator, car recorder, smart meter
Vacuum switch, digital camera, motor drive, clock circuit
UPS, toy, program-controlled switch, etc.

Kingtronics standard series of super capacitors
DKT-DZ, super capacitor Radial Type, Snap-in Type, Screw Type, low ESR
DKT-DX, super capacitor, radial type
DKT-DA, super capacitor, Coin Type, small size, large capacity
DKT-DM, super capacitor, Combined Type (Double Layer Capacitors), Low internal resistance
DKT-DY, super capacitor, Combined Type (Double Layer Capacitors), Low leakage current 

Kingtronics SMD type E-cap are designed for surface mounting on high density circuit board, both Plastics Reel Packaging and Paper Reel Packaging are available.

Following are Kingtronics strong product series of SMD type E-cap with ISO/RoHS certified quality, welcome your inquiry for more information.
Application:
power supplies,
Industrial Welding Machines,
Variable Frequency Speed Controller
Power Socket
Lamp,  Lighting, LED Power Device, LED Driver,
Power Meters, Energy Meters, and other general purpose.

Kt Kingtronics - Aluminum Elec. Capacitors Leaflet: https://www.kingtronics.com/pdf/Kingtronics-Aluminum-Electrolytic-Capacitor-Leaflet.pdf
Kingtronics Kt SMD Type Aluminum Electrolytic Capacitors Factory: https://www.youtube.com/watch?v=ZpMf5VRjjFU

The Tactile (Tact) switch is composed of insert, base, shrapnel, button and cover plate. The waterproof Tactile (Tact) switch adds a layer of polyimide film on the shrapnel (as shown in the picture).

The Tactile (Tact) switch has the advantages of small contact resistance, accurate operating force error, diversified specifications and so on. It is widely used in electronic equipment and white household appliances, such as video and audio products, digital products, remote controls, communication products, household appliances, security products, playing equipment, computer products, fitness equipment, medical equipment, note checking pen, laser pen keys and so on.

Chinese New Year is approaching.
Kingtronics team would like to thanks the continuous support of new and regular customers.

We will endeavor to provide your with good quality production, favorable prices and excellent services in coming years.
Kingtronics Production lines will start around 3-weeks-holiday from 20th January.

Different production lines will have different schedule.
The lead time may be extended because of CNY holiday.

If any demand recently, please feel free to share earlier.
Thank you !

With the changing economic landscape and evolving consumer behavior, industries will continue their path of digital transformation. This means that the demand for semiconductors will increase. This prompts chipmakers and governments worldwide to work hard in closing the gap.

TSMC, the world’s leading semiconductor foundry, has pledged to invest $100 million to increase capacity over the next three years. Samsung and SK Hynix have teamed up with the South Korean government and spent $451 billion for the same venture.

Members of the European Union have their plans as well. The UK government is yet to reveal what they are precisely, but the idea is to help the local chip sector grow its capacity in their supply chains.

Both private and public sectors are determined to end the chip shortage. However, many challenges (policy making, local and international covid restrictions, etc.) need to be addressed before things get going.

Industry experts were optimistic at first, expecting the chip supply to recover by the end of 2021. Historically, demand for semiconductors declines every fourth quarter of the year, which should give chipmakers a chance to catch up.

That is not the case so far. It appears that the decrease in demand is not big enough for foundries to make a significant dent in the current imbalance.

They were forced to revise their initial opinion, and they now fear that the chip shortage could last until next year, maybe even until 2023.

Screw type Aluminum Electrolytic Capacitors can be applied to computers, communication powers, and Hi-ripple circuit of electric vehicle, electric train, general-purpose inverter, etc.

Our Screw type E-cap can replace below brands with competitive offer. We can also customize the request, too.

Welcome your inquiry to check the best offer for you. 

Radial type Aluminum Electrolytic Capacitors widely use in the electronic industry.Include automotive power, industrial LED lighting, telecom infrastructure and many.

Kingtronics produce and sell a wide variety of Aluminum Electrolytic Capacitors with long life, low Impedance and excellent performance options.

Following are some cross reference of Radial type Aluminum Electrolytic Capacitors.

Dear valued customer,

GKT-VR, GKT-VY suspended orders due to lack of raw materials

GKT-VX series can be provided, but please note that MOQ needs to be as following.

if you need receive cargo before Christmas, kindly suggest us send the order earlier, we will check case by case for u !

Kingtronics Authorized Distributor: Arrow, Newark, Farnell, TME

Kingtronics SMD E-cap Factory video → https://www.youtube.com/watch?v=ZpMf5VRjjFU&feature=youtu.be

Kingtronics’ Radial & Chip MLCC enjoy good reputation of price and high quality on the market, and our parts can replace below brands with very competitive L/T,  about 3~5 weeks!

Below are the cross table, welcome your inquiry to let us help you reduce costs!

MLCC Cross Reference