【经验】多层陶瓷电容器(MLCC)常见失效模式之机械裂失效应对方法
在消费类电子中,经常会碰到电容短路失效的情况,下图为MLCC电容常见失效模式分布。
从图上可以看到,机械应力裂占比最高,本文就机械应力裂这个模式做分享。
导致电容失效的机械应力有很多种,但常见的主要是PCBA的弯曲、弯折及扭曲产生的应力及电容两焊端锡膏不一致对电容产生的应力。其受力机理如下:
图1 PCBA受力弯曲示意图
如图1,电容所在PCBA受到了来自背面的应力,应力的分布如上图的①②③④位置,其中位置③应力施加于电容端头,当此应力超过电容本体的抗弯折承受能力,此时电容本体端电极与内电极连接处会产生开裂,裂纹通常呈45°角向内延伸,详见图2。
图2 电容受力开裂模式
如图2,PCBA为背面受力时,电容在焊端受力点为靠近PCBA一端,此位置为裂纹始点,并沿与改点所在面成45°角向内延伸。
裂纹产生后,有几种可能:
(1)裂纹未延伸至内电极层,即裂纹只发生于外围的陶瓷保护层,其短期内对电容本体的电气性能影响不大,但已有风险;
(2)裂纹已延伸至内电极层,但仅是细微的裂纹,此时在裂纹产生初期对电容的电气性能影响不是很明显,但裂纹产生是不可修复的,其会随着施加的电压、流经的电流、周边的环境温度不断恶化,最终表现为绝缘电阻值急剧下降(即漏电流急剧上升),电路表现为短路失效;
(3)裂纹已延伸至内电极层,且裂纹很大,此时电容漏电大,容易在裂纹最脆弱位置产生电极击穿,由电极熔融产生的高温可能会把端电极部分烧毁。
下图为实物摄图:
预防应对措施:
图3 机械应力裂失效预防措施
由上图,电容在贴片时应注意几点:
(1) 电容在PCBA布局设计时,应平行于分板边缘并远离分板边缘,同时应远离大插件或者大焊盘;
(2) 贴装时,应在电容所在PCBA背面加上支柱,确保PCBA不产生过大的弯折;
(3) 整机装配时,如打螺丝孔等工序时,应注意确保PCBA不产生过大的弯折。
下图为电容在PCBA的布局建议:
机械应力根据电容器在PCB上的位置不同而变化。施加在电容器上的应力大小如下: A>B=C>D>E
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型号- A0201C0G6R2C500N*A,A0603C0G2R7B500N*D,A0402X7R393J160N*B,A0603X8G240G500N*D,A0402C0G560F500N*B,A0603C0G4R7C500N*D,A0201X7R821K500N*A,A0603C0G620G350N*D,A0201X7R151J500N*A,A0603X8G120F101N*D,A0201C0G2R2A500N*A,A0805C0G300F631N*K,A0603X8G0R1A101N*D,A0805C0G100G251N*K,A0402C0G200G250N*B,A0805C0G101G500N*C,A0201X6S393J6R3N*A,A0201C0G8R2D500N*A,A0402C0G222G160N*B,A0201C0G0R9B250N*A,A0603C0G0R7A500N*D,A0402C0G121J500N*B,A0201X7R182K100N*A,A0402C0G102J250N*B,A0402C0G3R0C500N*B,A0201X5R391K250N*A,A0201C0G4R0A250N*A,A0603C0G100D500N*D,A0402C0G1R0B500N*B,A0603X6S226M4R0N*K,A0201C0G8R0C250N*A,A0402C0G271G250N*B,A0201X5R153J6R3N*A,A0402C0G680G350N*B,A0402C0G3R9A500N*B,A1206X6S685K160N*O,A0402C0G330J250N*B,A0603C0G5R1B350N*D,A0201C0G102J250N*A,A0201X5R683J160N*A,A0402X7R224M160N*N,A0603C0G150G350N*D,A1210X6S226M160N*R,A0201C0G121J500N*A,A0603C0G7R5A500N*D,A1206X5R225K500N*L,A0402X6S224M160N*B,A0603C0G222G250N*D,A0603C0G3R0C500N*D,A0201C0G271G160N*A,A0603X8G1R8A101N*D,A0805C0G470J500N*C,A1206C0G180G202N*O,A0603X8G331G101N*D,A0402X7R561J6R3N*B,A0603C0G1R0B500N*D,A0201X5R331K160N*A,A0402X6S224M160N*N,A0402X7R474M6R3N*N,A0603C0G822J250N*D,A0402C0G150G350N*B,A0201X5R683J6R3N*A,A0201C0G330J250N*A,A0201X6S224M6R3N*J,A0603C0G822J160N*D,A0201C0G330J160N*A,A0201C0G3R9A500N*A,A0805C0G680F251N*K,A0201C0G271G250N*A,A1206C0G300J102N*O,A0201X5R153J160N*A,A0402C0G1R3B160N*B,A0805C0G182J631N*H,A0402X5R683J250N*B,A0201C0G560F500N*A,A0603C0GR75A350N*D,A0805X5R105M160N*G,A0402C0G3R3C160N*B,A0402C0G620G350N*B,A1206C0G201J251N*O,A0402X6S474M160N*B,A0201C0G1R2C250N*A,A0201X5R823K160N*A,A0603C0G120J251N*D,A0402X7R333J6R3N*B,A1206C0G153G251N*L,A0402C0G201J101N*B,A0603C0G300J500N*D,A0805C0G183G500N*G,A0805C0G220J500N*C,A0402C0G0R9B250N*B,A0805C0G333J101N*G,A0603C0G200G250N*D,A0201X5R823M100N*A,A0201X6S824K6R3N*F,A1206C0G223J251N*L,A0201X5R563M250N*A,A1206C0G240G631N*E,A0603X8G0R6A500N*D,A0402X6S474M160N*N,A0201C0G102J160N*A,A0201X6S474M6R3N*F,A0201X5R152K250N*A,A0402X6S224M6R3N*B,A0805C0G271J501N*K,A0201C0G1R0B500N*A,A0201X7R392K250N*A,A0603C0G201J101N*D,A1206C0G823J101N*L,A0805C0G300J101N*C,A0201X5R272M250N*A,A0603C0G271G250N*D,A0402X7R333J160N*B,A0402C0G100C350N*B,A0402X7R474M160N*N,A0805C0G201J201N*K,A0201X7R332M100N*A,A0805C0G561J101N*C,A0603C0G3R9A500N*D,A0201X6S333J160N*A,A0201C0G151J250N*A,A0402C0G7R5A500N*B,A0201X5R223J100N*A,A0402C0G222G250N*B,A1210X6S106K250N*R,A0201C0G0R1B101N*A,A0402C0G2R2B101N*B,A0603C0G330J250N*D,A0402C0G5R1B350N*B,A0201X5R223M6R3N*A,A0805C0G180G201N*K,A0402C0G6R2D101N*B,A0603C0G1R3B250N*D,A1210C0G102G102N*Q,A0201C0G200G250N*A,A0402X6S334K4R0N*B,A0603C0G222G160N*D,A0201C0G1R3B160N*A,A0402X7R182K100N*B,A0805C0G272J201N*K,A0402X7R393J6R3N*B,A0603C0G220J350N*D,A0402X6S224M250N*N,A0603C0G3R3C160N*D,A1206C0G473G101N*O,A0201X6S474M160N*F,A0201C0G0R4A250N*A,A0402X6S224M250N*B,A0603C0G1R6A350N*D,A0402X6S824K6R3N*B,A0201X5R104J6R3N*A,A0603C0G180J251N*D,A0805C0G120G201N*K,A1206X6S155K160N*O,A0603C0G5R6C350N*D,A0603C0G101G350N*D,A0201X5R103M100N*A,A0402C0G102J160N*B,A1206C0G393G500N*E,A0402X5R563M250N*B,A0402C0G0R7A500N*B,A1206C0G120G202N*O,A1206X5R475K500N*L,A0402C0G4R7C500N*B,A0201C0G3R3B101N*A,A0603C0G240G251N*D,A0201C0G4R0A160N*A,A0603X8G8R2C500N*D,A0201X5R391K160N*A,A0402C0G2R7A350N*B,A0201X7R221M500N*A,A0201X5R103K250N*A,A0201X7R332K250N*A,A0805C0G100J631N*K,A0201X5R823K6R3N*A,A0402C0G8R2D500N*B,A0201C0G8R0C160N*A,A1206C0G120J631N*E,A0201X6S393J160N*A,A0201C0G7R5A500N*A,A0603C0G121J500N*D,A0805C0G122J631N*H,A0201C0G151J160N*A,A0201C0G0R2A101N*A,A0805C0G180F501N*K,A1210X5R475K500N*R,A1206X6S106K160N*L,A0201C0G3R3C250N*A,A0402X7R273J100N*B,A0201X7R392M100N*A,A0603C0G300F101N*D,A0201X5R104J160N*A,A0402C0G0R9B160N*B,A0805C0G392G201N*K,A0201X5R152K160N*A,A0201X5R563J100N*A,A0201X7R471M500N*A,A0402C0G4R0A160N*B,A0402X7R332K160N*B,A0402X7R104M100N*B,A0201C0G6R2D101N*A,A0201X7R121J6R3N*A,A0201C0G331G500N*A,A0603C0G271G160N*D,A0805C0G820J631N*K,A1206C0G103J101N*E,A0805C0G470F101N*C,A0603C0G330J160N*D,A0805C0G470G501N*K,A1206C0G560F102N*O,A0402C0G3R6B350N*B,A0603C0G120G101N*D,A0805C0G152G501N*H,A0201X5R153J250N*A,A0201C0G7R0A101N*A,A0201X7R121J160N*A,A0603C0G4R7B350N*D,A0402C0G1R6A350N*B,A0201X6S273J100N*A,A0402C0G1R0A350N*B,A0603X8G7R0D500N*D,A0402C0G560J350N*B,A0603C0G200G160N*D,A0201X5R223M250N*A,A0201C0G180G101N*A,A0402C0G1R5C500N*B,A0603C0G100C350N*D,A0805C0G200F201N*K,A0402C0G3R0B350N*B,A0201C0G681J250N*A,A0603C0G5R1C500N*D,A0603X8G180J500N*D,A0201C0G0R7A500N*A,A1210C0G183G631N*Q,A0805C0G820G251N*K,A0402C0G3R3B101N*B,A0805C0G100D101N*C,A0603X8G6R2C101N*D,A0603C0G0R4B350N*D,A1206C0G561J102N*O,A0603C0G272J101N*D,A0603C0GR75B500N*D,A0805C0G222J501N*H,A0603C0G2R4C350N*D,A0201C0G2R7B500N*A,A0402C0G1R3B250N*B,A0402C0G3R3C250N*B,A0201X5R473M160N*A,A0603C0G5R0C350N*D,A0805C0G200J501N*K,A0603C0G151J250N*D,A0805X5R105M250N*G,A0201X5R471J250N*A,A0201X5R682K250N*A,A0603C0G4R0A250N*D,A0603X8G1R0A500N*D,A0402C0G0R4A250N*B,A0603X8G181J101N*D,A0603C0G7R0D350N*D,A0201X6S104M100N*A,A0402X7R183M6R3N*B,A0201X5R103K6R3N*A,A0603C0G560G101N*D,A02
【技术】一文解析MLCC的四大发展方向——微型化、高容量化、高可靠方向、高频化
本文中微容科技将为大家解析MLCC的四大发展方向——微型化、高容量化、高可靠方向、高频化。
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可加工PCB层数:4~32层,加工板材:多层板/HDI板/FR4板/高频板/高速板/高温板/铜基板/铝基板/陶瓷基板/软硬结合板,成品尺寸:3~1100mm,板厚:0.15-80mm,最小孔径:0.1mm,铜厚:最高14oz。
最小起订量: 1 提交需求>
可定制UV胶的粘度范围:150~25000cps,粘接材料:金属,塑料PCB,玻璃,陶瓷等;固化方式:UV固化;双固化,产品通过ISO9001:2008及ISO14000等认证。
最小起订量: 1支 提交需求>
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