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

More information about our super capacitors have been collected as below to help our customers learn our parts well.
Kingtronics best support is waiting for you. :-)
https://www.kingtronics.com/Super-Capacitors/index.html

Applications:

1.RAM, Detonator, car recorder, smart meter, vacuum switch, digital camera, motor drive, clock circuit, UPS, toy, program-controlled switch, etc

2.Battery + EDLC (as power assist), water meter, gas meter, smart meter (as motor driven), wireless equipment (as power assist), pulse power application, industrial equipment, motor drive (high current discharge), Tax Controller, Barcode Scanner, Handy terminal, GPS. Digital camera, container tracking system, RAM, Detonator, Vacuum switch, program-controlled switch, car recorder, clock circuit, UPS, toy

3.Smart Meter :smart electricity meter, smart water meter, smart gas meter

Car Electronics: car audio, ETC systems, driving recorder.

IoT 5G: smart TV, smart refrigerator, smart electronic door

 

Kingtronics YouTube Channel share product information and Manufacturing process.

Visit and subscribe Kingtronics YouTube Channel to learn more.
https://www.youtube.com/c/KingtronicsKt/videos

There are different playlists in the channel, you can choose to play according to the products you want to know.
Aluminum Electrolytic Capacitor: https://www.youtube.com/playlist?list=PLVfE6yUpC0-GtHev6au680RZ3zjm9b7kI

Trimming Potentiometers:
https://www.youtube.com/playlist?list=PLVfE6yUpC0-GsFquRipGn6vI_kw8xYDDw

Multilayer Ceramic Capacitors:
https://www.youtube.com/playlist?list=PLVfE6yUpC0-HhNfhk3CKzMBqpD6CcxD4u

Diodes and Rectifiers:
https://www.youtube.com/playlist?list=PLVfE6yUpC0-Hlh07UFE7m9kFJsspI-9gH

About Kingtronics:
https://www.youtube.com/playlist?list=PLVfE6yUpC0-GwHcqRD7oX_T1jZsJ41t9C

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

A.Power supply circuits

Stable DC power supplies are divided into intermittent control types (switching regulator) and continuous control types (Dropper).
Recent trends have shown an overwhelming growth in switching regulators, and so we talk mainly about switching regulators below.
The capacitors used in switching regulators are selected depending on the circuit. A forward switching regulator is shown as an example in Flg.6-1. Another type is a fly back regulator.



(1) Aluminum electrolytic capacitors for input (primary) smoothing circuits The Aluminum electrolytic capacitors for input smoothing circuits used on commercial voltages (100 V.AC, 200 V.AC) and commercial frequencies (60 Hz, 50 Hz) must have a high withstand voltage and a ripple current resistance complying with twice the commercial frequency (normally full-wave current).
These capacitors have large volumes (ground contact areas) compared to other components they are assembled with ,and so the demand for more compact capacitors, as well as power supplies, is strong. Another problem is the need for longer aluminum electrolytic capacitor lives, but products guaranteed for 5000 hours at 105℃ have recently been developed, thus realizing freedom from maintenance for 10 years.

(2) Aluminum electrolytic capacitors for output smoothing circuits The rated voltage of aluminum electrolytic capacitors used for smoothing at switching frequencies (20 k to 500 kHz) is determined by the output voltage, and they must have low impedance (low ESR) at switching frequencies. Therefore aluminum electrolytic capacitors for output smoothing are designed to have low impedance at 20 k to 500 kHz, and the recent development of a low resistance electrolyte using new materials has resulted in products with 1/3 to 1/4 the impedance of conventional products with the same volume. These low impedance products also have an extremely stable life

B. ECU for automotive

The electronization of in-vehicle control is accelerating these days. ECU (electrical control unit) which carries out in-vehicle control is asked for high reliance, a miniaturization, and high quality, and many aluminum electrolytic capacitors are used for it. A typical application example is shown below. 

(1) Power train ECU (Engine、 HV-Inverter etc.)


(2) Motor control ECU（Power steering, a blower / radiator fan motor, an electric pump etc.）


(3) LED lump


(4) Airbag


In automotive application, there are mainly an object for smoothing of input and output of the power supply of ECU and an object for energy reserve.
The rated voltage of 25 to 50 V.DC is mainly used.Not only current aluminum capacitor, aluminum capacitor with conductive polymer and
electrolyte is increasing due to improve quality, performance, with standing-voltage.It contributes to the small size of ECU, and a weight saving these days.

Kingtronics Snap-in type Aluminum El-cap is workable for PCB Mounting. We can replace below brands with more competitive price & L/T support, about 3~4 weeks.
Below is the cross table. Welcome your inquiry to check our 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

Many customers turn to us for the inquires and orders for HC49 series Quartz Crystal recently because a number of suppliers start ceasing production of it.

However, Kingtronics’ production for HC49 series is still quite stable and we can support very competitive offer! 😊 Welcome check price with us.