PCB Surface
Cantidad : 0 PCS-1000 Precio : 1 USD/set ~ 300 USD/
PCB surface finish include: PCB plating finishes is a coating between a component and a bare board PCB. It is applied for two basic reasons: to ensure solderability, and to protect exposed copper circuitry. As there are many types of surface finishes, selecting the right one is no easy task, especially as surface mounts have become more complex and regulations such as RoHS and WEEE have changed industry standards.
Recently, the common surface PCB treatment technologies which GreensTone may use when manufacturing PCBs are HASL(hot air solder leveling), organic coating (OSP), electroless nickel/gold, immersion silver, immersion gold, etc.
The solder mask is mainly Liquid UV Photo-imageable Ink with green, red, black, yellow, white, matt black/green, bule, gray, etc. green should be the most commonly used one. The suggested soldermask clearance in GERBER is 2-4 mils.
The silkscreen layer is the top layer of the PCB and serves as a reference indicator for placing components on the PCB. The graphics and text on PCB, a circuit board is usually printed with a permanent non-conductive epoxy ink. The color is typically white. Screen printing is used to specify useful information on the PCB board, which can help users during the assembly. It is used to mark component values, part numbers, test points, polarity, etc.
PCB Surface Features
PCB surface finish Comparison of cost and solderability
Actual solderability: Electroplating nickel gold> HASL > OSP > ENIG >Immersion silver >Immersion tin
Cost: Electroplating nickel gold > ENIG > Immersion silver> Immersion tin > HASL > OSP.
The functions of the solder mask layer on the PCB board
Preventing short circuit from bridge connection in the soldering process
Preventing the physical breakage of a conductor circuit
Prevent short circuit between conductive lines and solder joints when proceeding reflow soldering, wave soldering, and manual welding
Preventing the copper layer from oxidation
Its high Insulating brings the possibility to the high density of PCB finish
Here are three main ways to add silkscreen coating on a PCB
Manual screen-printing: This is a process that can be used when line widths are greater than 7 mm and the registration tolerance is 5 mm.
Liquid Photo Imaging (LPI): This process provides more accuracy and legibility over manual screening and is used when line widths are greater than 4 mm
Direct Legend Printing (DLP): This is the most accurate way of adding a silkscreen, however, it is very expensive.
For more information about electronic manufacturing service china and turnkey pcb assembly, please feel free to contact us!
Persona a contactar : Tone Greens, +75 5 23 21 59 83
Buen trato: comprar del vendedor
Por favor, lea nuestras condiciones de uso. También puede visitar nuestras preguntas frecuentes y ver nuestra información sobre los riesgos relacionados con la falsificación.
Esta página es acerca de los importadores y exportadores de PCB Surface Buscar en la categoria : Varios / Descuento Buscar en la categoria : surface |
Domingo 10 agosto 2014
Cantidad : as you nee - Precio : USD 3500-88888
Finished products /charcoal balls Technical parameters of charcoal black powder briquette making machine Type YHQ290 Capacity(t/h) 1.5-2 Roll Diameter(mm)290 Roller SurfacePressure(t/cm)1 Roll Speed(r/min)15-17 Power (kw) 5.5 ReducerZQ300 YHQ-360 2.5-3.5 360 1 15-17 7...
Henan Zhengzhou Yonghua Machinery
- olina1
- 450000 - zhengzhou CITY
- +13 6 07 69 93 63
Sábado 06 octubre 2012
Cantidad : 6 - Precio : 0,00 €
Appareil d'entraînement pour le dos... votre thérapeute à domicile ! L'appareil développe un doux bercement rythmique circulaire continu du bassin, de l'avant vers l'arrière et d'un côté vers l'autre que l'on définit comme " Mouvement passif continu " qui permet de relâcher doucement...
WTC
- 57000 - METZ
- 06 51 05 50 33
Viernes 16 mayo 2014
Cantidad : 5000000 - Precio : $0.25-5/pc
Perfil De La Empresa: Totalmente equipado con avanzados cnc maquinaria, tenemos experiencias ricas para precisión fabricación piezas mecanizadas, piezas torneadas, piezas de fresado como por los dibujos para ofrecer la parte superior- muesca productos. Nuestras instalaciones de...
Xiamen Karo Co.,Ltd
- karoplastic
- 361002 - Xiamen
- 0086 592 5135406