【选型】MLCC叠层电容如何选型？

时间： 2019-05-03 来源：硕凯电子

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MLCC(片状多层陶瓷电容)现在已经成为了电子电路最常用的元件之一。MLCC表面看来非常简单，可是很多情况下，设计工程师或生产、工艺人员对MLCC的认识却有不足的地方。本文将讲解MLCC选择及应用上的一些问题和注意事项。

MLCC虽然是比较简单的，但也是失效率相对较高的一种器件。失效率高，一方面是MLCC结构固有的可靠性问题，另外还有选型问题以及应用问题。

由于电容算是“简单”的器件，所以有的设计工程师不够重视，从而对MLCC的独有特性不了解。在理想化的情况下，电容选型时，主要考虑容量及耐压两个参数就够了。但是对于MLCC，仅仅考虑这两个参数是远远不够的。

MLCC不同材质对性能的影响

使用MLCC，不能不了解MLCC的不同材质和这些材质对应的性能。MLCC的材质有很多种，每种材质都有自身的独特性能特点。不了解这些，所选用的电容就很有可能满足不了电路要求。举例来说，MLCC常见的有C0G（也称NP0）材质、X7R材质、Y5V材质。C0G的工作温度范围和温度系数最好，在-55°C至+125°C的工作温度范围内，温度系数为0 ±30ppm/°C。X7R次之，在-55°C至+125°C的工作温度范围内，容量变化为±15%。Y5V的工作温度仅为-30°C至+85°C，在这个工作温度范围内，其容量变化可达-22%至+82%。当然，C0G、X7R、Y5V的成本也是依次降低的。在选型时，如果对工作温度和温度系数要求很低，可以考虑用Y5V的，但是一般情况下要用X7R的，要求更高时必须选择COG的。一般情况下，MLCC厂家都设计成使X7R、Y5V材质的电容在常温附近的容量最大，但是随着温度上升或下降，其容量都会下降。

设计工程师除了要了解MLCC的温度性能外，还应该了解更多的性能。比如Y5V介质的电容，虽然容量很大，但是，这种铁电陶瓷有一个缺点，就是其静态容量随其直流偏置工作电压的增大而减少，最大甚至会下降70%。比如一个Y5V/50V/10uF的电容，在50V的直流电压下，其容量可能只有3uF!当然，不同的厂家的特性有差异，有的下降可能没这么严重。如果一定要用Y5V的电容，除了要知道其容量随温度的变化曲线图外，还必须向厂家索取其容量随直流偏置电压变化的曲线图(甚至是要容量温度直流偏置综合图)。使用Y5V电容要有足够的电压降额。X7R的容量随其直流偏置工作电压的增大也减少，不过没有Y5V的那么明显。同时，MLCC尺寸越小，这种效应就越明显。

硕凯电子的陶瓷叠层电容MLCC有0402、0603、0805、1206、1210、1808、1812、2220、2225 等封装，可满足不同场合的需求。

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硕凯PPTC(贴片保险丝)选型表

提供硕凯电子PPTC自恢复保险丝选型，PPTC作为过流电子保护元件，采用高分子有机聚合物在高压、高温，硫化反应的条件下，掺加导电粒子材料后，经过特殊的工艺加工而成。相对传统保险丝硕凯PPTC自恢复保险丝具备过流过热保护，自动恢复双重功能。硕凯PPTC 具备多工作电压电流可供选择，可提供0603封装-2920封装纯贴片自恢复保险丝，工作电流从10ma-10a,工作电压从6V-60V，满足客户各种情况的需求！

产品型号	品类	封装	I hold(A)	I trip(A)	V max(Vdc)	I max(A)	P dtyp.(W)	Current(A)	Time(Sec.)	R min(Ω)	R max(Ω)
SCF005-0603R	Surface Mount Resettable PTCs	0603	0.05A	0.15A	15V	40A	0.5W	0.5A	0.1s	3.8Ω	30Ω

选型表 - 硕凯电子立即选型

硕凯电子，能否提供国产化证明，稳压二极管 MM1Z4V7。

2024-12-06 - 技术问答代理服务技术支持采购服务

【技术】微容科技关于MLCC制作流程详解

MLCC（Multi-layers Ceramic Capacitor），即多层陶瓷电容器，也称为片式电容器、积层电容、叠层电容等，是使用最广泛的一种电容器。MLCC是由印好电极的陶瓷介质膜片以交错的方式叠合起来，微容科技详细介绍了MLCC制作流程。

2022-08-26 - 技术探讨代理服务技术支持采购服务

宇阳（EYANG）MLCC片式多层陶瓷电容器选型指南

工业级P/B系列工业级中高压系列通用型系列通用中高压系列低损耗系列大功率低损耗系列车载系列车载低损耗系列

宇阳 - 高频MLCC,超微型MLCC,HIGH RELIABILITY MLCC,小型化MLCC,高可靠性MLCC,MLCC,HIGH FREQUENCY MLCC,ULTRA MICRO MLCC,P0805C0G9R1D251N#E,B0105X5R331K6R3N#Z,B0105X7R560K160N#Z,P0805C0G620G251N#E,B0201C0G3R0A250N#A,B0201X7R181M500N#A,P0805X8G1R2A501N#E,B0402C0G221K500N#B,P0805X8G4R7A251N#E,B0603C0G182G250N#D,B0805X5R153M101N#H,B0105C0G151J250N#Z,B0201X7R271J160N#A,B0805X5R223K101N#Y,B0402X7R102M250N#B,P0201C0G4R0B201N#A,B0402X7R121M500N#B,P0805C0G5R1B251N#E,P0805C0G150G251N#E,P0201X8G5R6B201N#A,B1206X5R822M101N#O,B0805X5R153M101N#Y,P0603X8G120J251N#U,P0201C0G2R0A201N#A,B0402C0GR68B250N#B,B0402C0G8R0A500N#B,P0603C0G8R2D251N#U,P0201X8G3R6A201N#A,B0805X5R103J631N#H,B0105C0G0R9B160N#Z,B0201X7R102M160N#A,B0805X5R472M631N#H,P0603C0G6R2C251N#U,B0402C0G4R7A250N#B,B0402X5R102K101N#B,B0603X5R106K100N#K,B0603C0G122G160N#D,B0201X5R183J100N#A,B0201C0G7R0C250N#A,P0603C0G2R2A251N#U,B0201X7R471K160N#A,P0805X8G3R0A251N#E,P0402C0G330F201N#B,P0805X8G5R0B251N#E,B0603X5R152J101N#D,B0603X5R561J201N#D,B0201C0G5R0B250N#A,B1206X5R222J101N#O,B0402C0G2R0C500N#B,B0105C0G8R0C160N#Z,B0105X5R331M100N#Z,P0805X8G7R0C251N#E,B0201X7R562J250N#A,B0402X5R474M250N#B,P0805C0G6R8B251N#E,B0603X5R822K101N#D,B0105X5R391M100N#Z,B0201X7R221K250N#A,B0105X5R272J100N#Z,B0105X5R472K100N#Z,B0105C0G0R4A250N#Z,B0105X7R121J160N#Z,B0402X5R474M250N#N,B0105C0G2R4B250N#Z,B0105X5R103M100N#Z,B0402X5R563K500N#C,B0805X5R223K101N#H,P0402C0G2R0A201N#B,B0105C0G200G160N#Z,B0402X5R334K100N#N,P0402C0G4R0B201N#B,B0402X7R181M500N#B,B0805X5R392M101N#Y,B0402C0G1R5A250N#B,B0402X5R334K100N#B,P0402C0G0R5A201N#B,B0805X5R431J501N#Y,P0603C0G3R0C251N#U,B0105C0G0R9B250N#Z,B0201X7R121M500N#A,P0402X8G0R4A201N#B,B0105C0G4R0A160N#Z,B0402C0G1R2A500N#B,B0201X7R102M250N#A,B0402X5R271M101N#B,B0603X5R511K201N#D,B0402C0G100G250N#B,P0603C0G1R0B251N#U,B1206X5R473J501N#L,B0805X5R392M101N#H,B0201C0GR68B250N#A,B0402C0G7R5D250N#B,P0402X8G2R4B201N#B,B0201C0G8R0A500N#A,B0201X5R183M160N#A,B0402C0G680F250N#B,B0603X5R911M201N#D,B0201C0G1R6C500N#A,B1206C0G333J250N#L,B0805X5R391J631N#Y,B0201C0G8R2B250N#A,B0603X5R222M101N#D,B0201X7R471K250N#A,B0105C0G151J160N#Z,B1206X5R471K101N#O,P0805X8G2R0C501N#E,B0402C0G7R0C250N#B,B0603X5R821J251N#D,P0201X8G6R8A201N#A,P0201X8G0R4A201N#A,B0201C0G100G250N#A,B0603X5R476M4R0N#K,B0402X5R152J101N#B,P0805X8G7R5D251N#E,B0402C0G3R0A250N#B,B0402C0G241J250N#B,P0402C0G2R2A251N#B,B0603X5R271K251N#D,B0805X5R272K101N#Y,B0805X5R683M101N#H,B0805X5R104M101N#Y,B0201X7R222J160N#A,B0402C0G471K500N#B,B1206X5R106K250N#L,B0402C0G182G250N#B,B0105X5R152M100N#Z,B0805X5R102K201N#Y,B0105X5R153J6R3N#Z,B0603C0G182G160N#D,B0201C0G1R5A250N#A,B0805X5R272K101N#H,P0402C0G6R2C251N#B,B0201C0G270K500N#A,P0603X8G0R6A251N#U,B1206X5R102M101N#O,P0402X8G3R6A201N#B,B0105X5R201M6R3N#Z,B0805X5R683M101N#Y,B1206X5R272K102N#O,B0201C0G241J250N#A,B0805X5R161K501N#Y,B0805X5R473K101N#H,B0805X5R222J251N#Y,B0402X7R273K500N#B,B0402C0G0R3B250N#B,B0201C0G4R7A250N#A,B0105C0G330J250N#Z,B0105X5R272M6R3N#Z,B0805X5R473K101N#Y,B0402X7R472J6R3N#B,B0201X5R333J6R3N#A,B0603X5R271M101N#D,B0105C0G101K250N#Z,B0805X5R561M501N#Y,P系列,B0105C0G0R4A160N#Z,P0603C0G2R7B251N#U,P0402C0G0R6B251N#B,B0105C0G1R2C160N#Z,B0105X5R103K6R3N#Z,B0201X7R331J500N#A,B0402C0G620F250N#B,B0402X5R222M101N#B,B0201X7R681M250N#A,B0603C0G152G500N#D,P0805C0G680G251N#E,B0603X5R102K101N#D,B0805X5R181M631N#Y,B0105X5R201J100N#Z,P0805X8GR68B251N#E,P0402X8G6R8A201N#B,B0805X5R331J631N#Y,P0402C0G3R0C251N#B,P0805X8G8R0A501N#E,B0603C0G222J500N#D,B0805X5R475K250N#H,B0201C0G471K500N#A,B0402X5R474M6R3N#B,B0603X5R331J101N#D,P0805X8G0R3B251N#E,B0201C0G6R8D500N#A,P0805X8G200J501N#E,B0805X5R681J501N#Y,B0105C0G1R3B160N#Z,B0402X5R102J500N#B,B0402C0G152G500N#B,B1210X5R226M160N#L,B0805X5R475K250N#Y,B0105X5R392J6R3N#Z,P0603X8G0R5B251N#U,B0105C0G200G250N#Z,P0402C0G4R7C251N#B,P0805C0G470J251N#E,B1210X5R226M160N#R,B0805X5R392K251N#Y,P0603C0G1R5C251N#U,B1210X5R226M160N#Q,B0402C0G240K250N#B,B0805C0G822G500N#K,P0201C0G1R3C201N#A,B0402X5R224M250N#B,B0201C0G680F250N#A,B0402C0G8R2B250N#B,B0402C0G620K250N#B,P0805X8G9R1C251N#E,P0402C0G2R7B251N#B,P0402X8G5R1A201N#B,B0402X7R272K100N#B,B0402X5R393J250N#B,P0805C0G100C251N#E,B0201C0G0R8A500N#A,P0402C0G2R4C201N#B,P0402X8G330J201N#B,B0402C0G180F500N#B,P0805C0G2R7A251N#E,P0201X8G4R0A201N#A,B0402X5R224M250N#N,B0402X5R201K500N#B,P0805C0G4R7B251N#E,P0402X8G0R9B201N#B,B0201C0G150F250N#A,B0201C0G820G250N#A,B0805X5R121M631N#Y,B0402X5R474M160N#B,B0603X7R474K500N#D,B0105X7R181J160N#Z,B0201C0G220G500N#A,B0402C0G680K250N#B,B0805X5R104M101N#H,B0201C0G620F250N#A,P0805C0G5R6C251N#E,B1206X5R152M631N#O,P0603C0G0R6B251N#U,B0201X7R151M160N#A,B0105C0G3R6A160N#Z,B0105C0G101K160N#Z,B0402C0G200J500N#B,B1206X5R226M160N#L,B1206X5R472J101N#O,B0105X5R152K6R3N#Z,B0805X5R751M501N#Y,B1206X5R221K101N#O,B0402X7R222J250N#B,B0105C0G3R6A250N#Z,B0201C0G301J500N#A,B0805X5R911J101N#Y,B0402C0G6R2A250N#B,B0402C0G270K500N#B,B0402C0G222J500N#B,B0402X5R474M160N#N,B0201C0G470G500N#A,B0105C0G5R6B160N#Z,B0201X7R751K160N#A,P0402C0G3R9A251N#B,B0105X7R820K100N#Z,P0805C0G101G251N#E,P0603C0G7R5A251N#U,P0603X8G330G251N#U,P0201X8G0R3B201N#A,B0201C0G270F500N#A,B0201X7R562J160N#A,B0805X5R101K501N#Y,P0201C0G0R4B201N#A,B0201C0G1R1B500N#A,车载,工业

2022/1/22 - 选型指南代理服务技术支持采购服务

【技术】深度解读高端MLCC的四大方面——发展方向、关键因素、制造工艺、发展形势

在广泛的市场应用中，MLCC技术也持续快速发展，高端MLCC成为市场和供应方共同的追求。而在中国，高端阻容元器件，也成了制约国家工业发展的“卡脖子工程”。今天微容科技就为大家详细解读高端MLCC。

2022-10-19 - 技术探讨代理服务技术支持采购服务

硕凯电子瞬态抑制二极管选型表

TVS(瞬态抑制二极管)，半导体材质，用于浪涌和静电防护，在小浪涌防护中广泛使用，速度快，封装小，残压低

选型表 - 硕凯电子立即选型

宇阳科技X6S/X6T MLCC产品，具有容值较高、工作温度高的特点，保障显卡的平稳运行

随着人工智能、深度学习和虚拟现实等领域的快速发展，电子产品向高性能、高可靠性、高集成度的方向发展，对MLCC产品的性能要求也越来越高，高温高容的产品也就拥有了更多的市场应用，传统MLCC的温度和容量已无法满足当今的需求，而X6S/X6T产品具有容值较高、工作温度高的特点，更符合市场需求。

2024-08-27 - 应用方案代理服务技术支持采购服务

硕凯电子车载TVS选型表

车规级TVS管通过了AEC-Q101汽车级认证，保护敏感型电子设备免受负载突降和其它电压瞬变的影响，符合AEC-Q101规范的汽车瞬态电压抑制二极管，提供5000W峰值脉冲功率耗散，采用标准的P600轴向引线封装。其高额定峰值脉冲功率耗散有助于电源系统通过ISO7637-2国际标准的浪涌测试，该标准是广泛用于汽车行业的基本瞬变规范。TPSMAJ、TPSMBJ、TPSMCJ、TPSMDJ、SM8S系列应用包括于汽车电子产品中的DC线路保护和ESD保护。