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What are the differences between layers of PCB?
What are the differences between layers of PCB?

2023-07-27

When designing PCB, many friends do not know enough about the layers in PCB, especially novices, who are vague about the role of each layer. This time, let's take a look at the differences of each layer when using the Altium Designer drawing board. 1. Signal layer The signal layer is divided into Top Layer and Bott……

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PCB常用化學(xué)藥品性質(zhì)解析
PCB常用化學(xué)藥品性質(zhì)解析

2023-04-06

PCB常用化學(xué)藥品性質(zhì):1、硫酸:H2SO4-無色油狀液體,比重15℃時(shí)1.837(1.84)。在30-40℃發(fā)煙;在290℃沸騰。濃硫酸具有強(qiáng)烈地吸水性,因此它是優(yōu)良的干燥劑。2、硝酸:HNO3-無色液體,比重15℃時(shí)1.526、沸點(diǎn)86℃。紅色發(fā)煙硝酸是紅褐色、苛性極強(qiáng)的透明液體,在空氣中猛烈發(fā)煙并吸收水份。3、鹽酸:HCl-無色具有刺激性氣味,在17℃時(shí)其比重為1.264(對(duì)空氣而言)。沸點(diǎn)為-85.2。極易溶于水。4、氯化金:紅色晶體,易潮解。5、硝酸銀:AgNO3-無色菱形片狀結(jié)晶,比重4.35

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簡(jiǎn)述PCB表面涂層的那些優(yōu)缺點(diǎn)
簡(jiǎn)述PCB表面涂層的那些優(yōu)缺點(diǎn)

2023-04-06

a.PCB鍍金板這種涂層最穩(wěn)定,但價(jià)格最高?! .浸銀板,性能不如鍍金涂層,容易發(fā)生電遷移導(dǎo)致漏電?! .化學(xué)鍍鎳/金板,當(dāng)浸金制程不穩(wěn)時(shí),易產(chǎn)生黑盤?! .浸錫板,不含鉛的浸錫板尚未完全成熟?! .熱風(fēng)整平板,這種涂層的生產(chǎn)工藝還未完全成熟?! .有機(jī)可焊性保護(hù)涂層板,這種涂層最便宜,但性能最差。使用OSP板時(shí),需注意兩次回焊之間及回焊與波峰焊之間板子的存放時(shí)間,因?yàn)榻?jīng)高溫加熱后板子焊盤上的保護(hù)膜受到破壞,可焊性會(huì)大大降低。

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高頻板與高速板的區(qū)別
高頻板與高速板的區(qū)別

2023-04-04

隨著5G通信的發(fā)展和建設(shè),電子設(shè)備行業(yè)對(duì)高頻高速板的需求越來越大。由于使用環(huán)境不同,高頻板和高速板有很多共同的特點(diǎn),也有一些區(qū)別。本文結(jié)合高頻高速板的使用環(huán)境和板材樹脂體系,闡述了高頻板和高速板各自的特點(diǎn),并對(duì)高頻板和高速板的未來發(fā)展進(jìn)行了展望。 一、5G網(wǎng)絡(luò)對(duì)高頻高速板塊的需求5G,第五代移動(dòng)通……

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