Model & package intelligence
Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
Jingdao Microelectronics 1SMA4728A
Configuration
1 options
Configuration
25+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- Electronic 1SMA4728A
- Type
- Jingdao Microelectronics
- Minimum package
- 5000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- Electronic
- Electronic Component
- 1SMA4728A
- Electronic Component
- 1
- Package
- SMA
- Electronic Component
- Zener Diode
- Electronic Component
- 0.619g
- Electronic Component
- 1
- (Zzt)
- 10Ω
- Electronic Component
- BM0229356715
- Diode
- 1
- Current(Ir)
- 100uA@1V
- Power Dissipation(Pd)
- 1W
- Electronic Component
- 3.1V~3.5V
- Electronic Component
- 55℃~+150℃
- Electronic Component
- Electronic Component
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
1SMA4728A 产品概述
一、产品简介
1SMA4728A 是晶导微电子推出的一款独立式稳压二极管，标称稳压值 3.3V（规格范围 3.1V～3.5V），采用 SMA 封装。该器件设计用于作为低功耗电压基准、过压钳位与小功率预稳压电路，适合空间有限、散热受限的贴片应用。
二、主要性能参数
- 稳压值（标称）：3.3V；允许范围：3.1V～3.5V
- 反向电流 Ir：100μA @ 1V
- 动态阻抗 Zzt：10Ω（典型）
- 最大耗散功率 Pd：1W（封装条件下）
- 工作结温范围：-55 ℃ ～ +150 ℃
- 封装形式：SMA（表面贴装）
- 器件配置：独立式稳压二极管
三、应用场景
- 低电流参考电压源与偏置电路
- 输入过压保护与钳位（对瞬态有限抑制能力）
- 小功率模拟/数模电路的局部稳压
- 通信、家电和工业控制中对 3.3V 旁路或保护需求
四、设计与使用建议
- 偏置电阻计算：R = (Vs − Vz) / (Iz + Ir)，Iz 为工作稳压电流（取决于所需稳压精度与输出电流）。
- 功率限制：理论上 Pd = Vz × Iz，可由此估算最大稳流 Iz(max) ≈ 1W / 3.3V ≈ 303mA。但受限于 SMA 封装的热阻与 PCB 散热能力，实际连续工作电流应远低于该值，建议遵循厂方温升曲线与安全裕度。
- 动态阻抗 10Ω 表明在小电流范围内稳压性能受电流变化影响明显，要求精确参考电压时应保持稳定且足够的偏置电流。
- 反向漏流 100μA 在高阻输入或低功耗测量电路中可能造成误差，应根据系统输入阻抗评估影响。
五、封装与焊接提示
SMA 为常用贴片封装，便于自动化贴装与回流焊。为降低结温并提升耗散能力，应在 PCB 上增大焊盘铜箔面积并添加散热过孔，优化热回流路径。回流焊温度曲线请参考晶导微电子的工艺建议以避免过热损伤。
六、选型参考与替代
当需更低动态阻抗或更高功率能力时，可考虑更大封装或专用低噪声基准管；若要求更严格的稳压公差，可选取标称公差更小的型号或配合精密参考芯片使用。购买与设计前建议参阅晶导微电子完整数据手册，确认测试条件与典型特性曲线。
Request for quote
Send RFQ
Use the form for single models, category sourcing, and multi-line BOM requirements.
Product sourcing intelligence
Model, package, availability, and BOM fit reviewed before quotation.
WMSIC turns product data, package visuals, BOM context, and sourcing signals into practical RFQ notes for buyers.
BOM matching & alternatives
BOM lines are compared by package, parameters, quantity, and workable alternatives for cleaner sourcing decisions.
Sourcing availability signal
Stock routes, quotation confidence, lead-time notes, and shipment feasibility are checked before sales follow-up.
Buyer sourcing scenarios
Examples of how common component sourcing requests are organized.
Typical RFQ scenarios based on the WMSIC form fields, catalog data, manual review steps, and shipment preparation workflow.
The buyer shares the full part number, package requirement, quantity, destination, and available product photos so the quotation can record the exact version under review.
A multi-line BOM is organized into direct sourcing lines, lines that need package clarification, and lines where alternative-part review is permitted.
The original manufacturer part number, datasheet revision, application, critical limits, and acceptable changes are collected before possible candidates are discussed.
Sample quantity, minimum packing, package format, target date, and courier destination are kept together in one RFQ conversation.
Package photos, model markings, board context, and the quantity needed for repair help focus the sourcing review on the relevant version.
When a suffix or package note is incomplete, the response records the open difference and requests buyer confirmation before procurement proceeds.
Packing format, carton notes, invoice details, courier option, destination, and tracking handoff are coordinated around the confirmed order.
The request connects the previously used model, current demand, package evidence, target timing, and replenishment sourcing route.
Related products
Packaged components ready for RFQ.
1 Piece BGA Integrated Circuit Chipset MN864739 CXD90061GG CXD90062GG PS5 QFN-80
- Model
- MN864739
- Package
