Informática

PCB Surface

Cantidad : 0 PCS-1000   Precio : 1 USD/set ~ 300 USD/

PCB surface finish include: PCB surface finish 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 printed circuit board 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 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 boards

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.

PCB Surface Manufacturing Introduction

HASL (hot air solder leveling)/HASL lead Free

HASL/HASL lead free is the process of coating tin-lead/ tin-lead free solder on the surface of PCB so that it forms a layer of both anti-copper oxidation and good weld ability of the coating.

Organic Coating (OSP)

OSP is a chemical process to build a layer of organic skin film on the clean bare copper surface, it helps anti-oxidation,and moisture resistance, to protect the copper surface from vulcanization or oxidation, etc. In simply words,OSP acts as a barrier between copper and air.

ENIG (Electroless Nickel/Immersion Gold)

ENIG is a thick nickel gold alloy with good electrical properties on the copper surface,acts as a rust barrier to protect PCB for a long time, which can be useful and achieve excellent electrical performance in the long term use of PCB.

Immersion Silver

Silver impregnation does not put heavy coat on PCB, which provides good electrical properties and maintains good solder ability when exposed to humidity ,heat,and pollution,

Immersion Tin

With adding organic additives to the tin layer, the tin layer structure is granular, which overcomes the tin whisker problems and has excellent thermal stability and solder ability.

As one of contract electronics manufacturing companies, we will do our best to meet all the needs of customers.

Ubicación : GreensTone (Shenzhen) Electronics Co., Limited, 518103 FuYong,
Persona a contactar : Tone Greens, +75 5 23 21 59 83

Buen trato: comprar del vendedor

Visita nuestra guía para una transacción segura! En ningún caso Algomtl no se hace responsable de los anuncios. Sólo la responsabilidad del vendedor o del comprador en caso de litigio está involucrado.
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 : Informática
Buscar en la categoria :
surface
Francia 361002 Materiales de ocasión
China Aduana Parte Plástico

Viernes 16 mayo 2014

Cantidad : 5000000pcs - Precio : $0.25-5/pc

Perfil De Emprea: Nos especializamos en desarrollar y producir inyección de plástico partes y moldes de inyección electrodomésticos, electrodomésticos, computadoras, dispositivos de telecomunicaciones aparatos farmacéuticos, accesorios de baño y construcción etc piezas de plástico...

Xiamen Karo Co.,Ltd

Francia 361002 Materiales de ocasión
Vuelos prototipos cnc plástico

Viernes 16 mayo 2014

Cantidad : 50000pcs - Precio : $1-25/pc

SLA Y SLS Por qué utilizar estéreo litografía? Estéreo litografía es muy similar a la sls( sinterización selectiva por láser) proceso de prototipado. Es s mejor utilizar sla, cuando acabado superficial y apariencia general directamente desde la máquina es el factor más importante...

Xiamen Karo Co.,Ltd

Hong Kong 999077 Medio ambiente / Ecologia
3W LED de luz de energía solar 4000mA sensor PIR escalera acero inoxidable camino paso...

Miércoles 22 abril 2015

Cantidad : 1piece - Precio : USD5~36

1 panel solar: 3W Ashiloy Industry co,ltd 2: 3.7V bateria de litio de alta calidad / 4400ma plena capacidad batería. 3.led: Power 3W, 38pcs. Epistar SMD 2835led, temperatura de color 5500-6000k, lumenes sobre 300lm.Brillo equivalente a 12 watts de brillotricolor Lampara de ahorro...

Ashiloy Industry Co.,Ltd

  • 999077 - KLN
  • +86 138235618632