ESD二极管应用选型表怎么校验？用JSON Schema检查电压、电容和通道

ESD二极管候选表一旦进入脚本处理，最危险的不是字段为空，而是不同条件的数据被当成可直接比较的数据。VC=12 V如果没有对应电流和波形，不能与另一行VC=18 V直接排序。

这类问题适合先用JSON Schema拦截格式和必填条件，再由工程师审核数据含义。

一条候选记录至少需要什么

json 复制代码

{
  "partNumber": "CANDIDATE_A",
  "polarity": "bidirectional",
  "channels": 1,
  "vrwmV": 5,
  "vbrMinV": 6,
  "clamp": {
    "vcMaxV": 18,
    "ippA": 2.5,
    "waveform": "datasheet-defined"
  },
  "capacitance": {
    "valuePf": 0.08,
    "status": "typical",
    "frequency": "from-datasheet",
    "biasV": "from-datasheet"
  },
  "package": "DFN0603-2L",
  "datasheetRevision": "required"
}

示例只展示字段关系，不对应采购批准。真实记录必须从当前规格书填写，并保存来源版本。

Schema把比较条件写进结构

bash 复制代码

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "required": [
    "partNumber",
    "polarity",
    "channels",
    "vrwmV",
    "clamp",
    "capacitance",
    "package",
    "datasheetRevision"
  ],
  "properties": {
    "partNumber": { "type": "string", "minLength": 1 },
    "polarity": {
      "enum": ["unidirectional", "bidirectional", "array"]
    },
    "channels": { "type": "integer", "minimum": 1 },
    "vrwmV": { "type": "number", "exclusiveMinimum": 0 },
    "vbrMinV": { "type": "number", "exclusiveMinimum": 0 },
    "clamp": {
      "type": "object",
      "required": ["vcMaxV", "ippA", "waveform"],
      "properties": {
        "vcMaxV": { "type": "number", "exclusiveMinimum": 0 },
        "ippA": { "type": "number", "exclusiveMinimum": 0 },
        "waveform": { "type": "string", "minLength": 1 }
      },
      "additionalProperties": false
    },
    "capacitance": {
      "type": "object",
      "required": ["valuePf", "status", "frequency", "biasV"],
      "properties": {
        "valuePf": { "type": "number", "minimum": 0 },
        "status": { "enum": ["typical", "maximum"] },
        "frequency": { "type": ["number", "string"] },
        "biasV": { "type": ["number", "string"] }
      },
      "additionalProperties": false
    },
    "package": { "type": "string", "minLength": 1 },
    "datasheetRevision": { "type": "string", "minLength": 1 }
  },
  "additionalProperties": false
}

Ajv只负责结构校验

javascript 复制代码

import Ajv2020 from "ajv/dist/2020.js";
import schema from "./esd-candidate.schema.json" with { type: "json" };
import candidate from "./candidate.json" with { type: "json" };

const ajv = new Ajv2020({ allErrors: true });
const validate = ajv.compile(schema);

if (!validate(candidate)) {
  console.error(validate.errors);
  process.exit(1);
}

console.log("结构完整，进入工程条件审核");

Schema通过只说明字段存在、类型正确。它不能确认规格书是否真实，也不能判断器件是否适合目标接口。

还要增加三类业务规则

电压窗口

VRWM必须覆盖线路最高正常电压，VBR不能侵入正常过冲范围。程序可以提示数值关系，线路的正常包络仍由项目输入。

钳位可比性

只有IPP、波形、温度和典型或最大状态一致时，VC才适合直接比较。不一致时输出"条件不同"，不要生成从低到高排行榜。

通道与封装

阵列器件要增加引脚映射、公共端和通道电压。封装名称相同不表示焊盘、内部结构和极性相同。

ASIM候选表怎样接入

导入阿赛姆ESD二极管资料时，可把完整型号、规格书版本、VRWM、指定IPP下的VC、Cj条件、封装和通道结构写入同一对象。脚本负责拦截缺字段记录，工程师再结合芯片耐压、PCB回路和整机静电测试批准型号。

参考资料：