🔎 US1G Diode Overview

As electronic systems evolve towards miniaturization and higher frequencies, fast recovery rectifier diodes play a crucial role in improving power efficiency and protecting switching circuits.

The US1G is a high-voltage, ultra-fast recovery rectifier diode in an SMA package, designed for fast-switching applications requiring reliable surge handling and stable thermal performance.

🔹 US1G Key Electrical Specifications

ParameterSymbolValueUnit
Reverse Voltage (Max)VRRM400V
RMS Voltage (Max)VRMS280V
Average Forward CurrentIF(AV)1A
Surge Forward CurrentIFSM30A
Forward VoltageVF1.4V
Reverse Leakage CurrentIR2µA
Reverse Recovery TimeTrr50ns
Junction CapacitanceCJ20pF
Operating Temperature
TJ-55 ~ +175°C
Package—SMA—

🔹 Advantages of Semiware's US1G Diode

1️⃣ High Voltage Capability

The US1G has a maximum repetitive reverse voltage of 400V and is suitable for:

  • Offline AC/DC power supply circuits
  • 220V AC mains applications
  • Industrial switching systems
  • The 280V RMS rating ensures stable operation in AC environments

2️⃣ Ultra-Fast Recovery Time - 50ns

A 50ns reverse recovery time ensures:

  • Reduced switching losses
  • Improved switching power supply efficiency
  • Reduced electromagnetic interference noise
  • Enhanced high-frequency converter performance

3️⃣ Strong Surge Current Handling Capability - 30A

A 30A surge current handling capability enables the diode to withstand:

  • Startup surge current
  • Load switching spike current
  • Transient surge events

This significantly improves system reliability.

4️⃣ Low Leakage Current - 2µA

A reverse leakage current of only 2µA helps to:

  • Reduce standby power consumption
  • Improve energy efficiency
  • Maintain thermal stability

Making it suitable for IoT devices and low-power devices.

5️⃣ Wide Operating Temperature Range

The US1G operates over a temperature range of -55°C to +175°C, enabling reliable operation in the following environments:

  • Industrial environments
  • Outdoor power systems
  • High-temperature PCB designs

🔹 US1G Typical Applications

  • Switching Power Supplies (SMPS) - Used in secondary rectification circuits for fast switching efficiency.
  • LED Drivers - Ensures stable current rectification and surge tolerance.
  • Industrial Control Boards - Handles high-voltage switching with reliable thermal endurance.
  • Consumer Electronics - Compact SMA package saves PCB space while maintaining performance.

⭐ Why Choose Semiware?

Choosing the right supplier is as important as choosing the right component. Here’s Semiware's advantages:

1️⃣ Consistent Quality

  • 100% critical electrical testing
  • Strict batch traceability
  • Reliability verification before shipment
  • RoHS compliant

We ensure consistent performance across every batch of US1G products in mass production.

2️⃣ Reliable Delivery

  • Stable production capacity
  • Standard safety stock of common models
  • Fast sample support
  • Flexible order quantities

3️⃣ Cost-Effective Alternative

US1G can replace many mainstream brands, offering the same performance at a more competitive price.

4️⃣ Technical Support

  • Model selection guidance
  • Cross-reference support for alternative products
  • Application suggestions

5️⃣ Long-Term Supply Commitment

Stable and continuous production plan to support long-term projects

🗺️ In summary,US1G is more than just a 400V ultra fast rectifier diode — it is a dependable solution built for high-efficiency, high-frequency power applications.

Whether you are optimizing an existing design or developing a new project, Semiware is ready to support your engineering and purchasing team with fast response and reliable delivery. 👉 https://en.semiware.com/contact/