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ESD7951ST5G

双向 ESD 二极管，5V Vrwm，0.5pF，12.9V clamp@1A，SOD-923，USB/天线保护

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制造商零件：

ESD7951ST5G

包装：

SOD-923（1.0 x 0.6 x 0.5 毫米，0.65 毫米间距）

品牌：
产品类别：
质量承诺
发货与付款
服务与包装
产品手册
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说明

onsemi 的 ESD7951ST5G 是一款双向超低电容 ESD 保护二极管，采用 2 引脚 SOD-923 封装 (1.0 x 0.6 mm)。它提供 5 V 工作电压、1 A 峰值脉冲电流下 12.9 V 的箝位电压、0.5 pF 结电容和 1 µA 最大漏电流。该器件可防止 IEC 61000-4-2 ESD 事件。其超低电容使其适用于 USB 2.0 高速和天线路径等高频信号线路。工作温度范围为 -55°C 至 +125°C。后缀 T5G 表示 8000 件带卷包装。.

onsemi 的 ESD7951 是一款双向 ESD 保护二极管，专为超低电容应用而设计。ESD7951ST5G 是 SOD-923 卷带式版本，每卷 8000 个。该器件的结电容仅为 0.5 pF，适用于电容负载必须降至最低的高频信号路径 - USB 2.0 高速（480 Mbps）、HDMI、射频天线线路和其他阻抗控制接口。.

双向配置可保护在地面上下摆动的信号线，因此适用于交流耦合和差分对接口。5 V 反向工作电压 (VRWM) 涵盖 3.3 V 和 5 V 逻辑轨，而 1 A 时的 12.9 V 箝位电压可确保受保护的集成电路在静电放电冲击期间看到有限的电压。.

SOD-923 封装仅占电路板面积 0.6 mm²，外形尺寸 0.5 mm，是目前最小的 ESD 保护封装之一。这对于 PCB 面积极其有限的智能手机、平板电脑和可穿戴设备来说至关重要。.

此外，ESD7951 还提供符合 AEC-Q101 标准的汽车合格版本 (SZESD7951ST5G)，适用于汽车应用。.

注：LCSC 清单将此部件标记为停产，但 onsemi 的 ESD7951 产品系列仍在生产。在设计新产品之前，请与授权分销商核实当前的供货情况。.

**双向 TVS 二极管结构：** ESD7951 在单个芯片中使用背靠背齐纳二极管，为正向和负向 ESD 瞬态提供对称箝位。正常工作时（电压在 -VRWM 和 +VRWM 之间），两个二极管均反向偏置，只消耗漏电流（最大 1 µA）。当正瞬态电压超过 VBR 时，上部齐纳二极管发生雪崩并箝位电压。当负瞬态电压超过 -VBR 时，下部齐纳二极管导通。.

**超低电容设计：** 0.5 pF 电容是通过专门的结型几何设计实现的，这种设计可最大限度地减小耗尽区面积，同时保持足够的雪崩能量吸收。这对于 USB 2.0 高速来说至关重要，因为 USB 2.0 规范限制了每条 D+/D- 线路的总电容负载。.

**箝位机制：** 在 IEC 61000-4-2 ESD 事件（8 kV 接触电压、15 kV 空气电压）期间，二极管在亚纳秒级的时间内发生雪崩，将 ESD 电流从受保护的集成电路分流出去。箝位电压（1 A 时为 12.9 V）表示受保护器件在事件中承受的电压。较低的箝位电压可提供更好的保护。.

针脚 名称 类型 说明
1 输入/输出 输入/输出 ESD 保护端子；连接至受保护信号线；双向；5V 工作电压；0.5pF 电容至 GND
2 接地 G 接地参考；通过最短路径连接至 PCB 接地平面；建议使用焊盘内通孔以实现低电感
应用 说明
USB 2.0 高速静电放电保护 保护 USB 2.0 HS (480Mbps) 端口上的 D+/D- 线路；每条线路 0.5 pF，远远低于 USB 规格的电容预算；置于连接器 3 毫米范围内；与共模扼流圈配对，提供全面保护
射频天线线路保护 保护天线馈电线，使其免受裸露连接器上 ESD 的影响；0.5pF 电容不会使 2.4/5GHz 阻抗匹配失谐；双向箝位适合交流耦合射频路径
HDMI/DisplayPort 信号保护 保护高速差分线对；超低电容可保持信号完整性；每条线路在连接器附近放置一个二极管
模型 制造商 兼容性 主要区别
ESD7951SOT5G onsemi 包装变体 采用 SOT-523 封装（1.6×0.8 毫米）的相同裸片；占地面积较大，但易于组装；当 SOD-923 太小而无法满足制造能力时使用
PRTR5V0U2X Nexperia 功能等效 双向 ESD 二极管；5V Vrwm；0.8pF；SOT-143B；电容稍高；包括附加轨钳二极管
TPD2E001DRLR TI 竞争性替代方案 2 通道 ESD 保护；每通道 0.5pF；SOT-533；与两个分立二极管相比，集成式二合一节省了电路板空间
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质量保证

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • 汽车电子: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • 医疗设备: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

联系我们

If you have inquiries about our quality standards, inspection procedures or product certification documents, please feel free to contact us:

 

Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

发货与付款

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
  1. Accepted Payment Methods
  • T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
  • PayPal: Ideal for small orders, sample orders and quick payments.

  1. Settlement Currency

     

    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

  2. Bank Charges

     

    All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.

  3. Payment Requirements
  • Sample and small orders: Shipment will be arranged upon full payment.
  • In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.

2. Shipping & Delivery

We partner with leading global logistics providers to ensure safe and fast delivery worldwide. Relevant details are listed below:
  1. Logistics Partners
  • International Express: DHL, FedEx, UPS, TNT
  • Economy Logistics: Air freight and sea freight for large-volume cargo
  • Domestic Delivery: SF Express, Yunda Express
  1. Order Processing Time
  • In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
  1. Estimated Transit Time
  • International Express: 3 – 7 working days globally
  • Air Freight: 7 – 12 working days
  • Sea Freight: 25 – 40 working days for heavy and large bulk cargo
  1. Shipping Fee Rules
  • Shipping cost is calculated based on package weight, volume, destination and delivery method.
  • Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
  • Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
  1. Shipment Tracking
     

    Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.

3. General Order Rules & Notes

  1. MOQ & Sample Service

     

    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

  2. Packaging Standard

     

    All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.

4. Customs & Liability Statement

  1. Import Duties & Taxes

     

    All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.

  2. Handling of Lost or Damaged Goods
  • In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
  • We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.

5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

Online Inquiry Form

Support Excel, PDF, CSV format files for full BOM list quotation

Submit your component procurement and custom packaging needs via the form below. We will provide a detailed quotation and professional solution within 1–8 working hours.

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