VUO82-16NO7: High-Reliability 1600V Three-Phase Diode Bridge for Demanding Industrial Applications
Content last revised on October 21, 2025.
Introduction to the VUO82-16NO7 Power Module
The VUO82-16NO7 from IXYS, now part of Littelfuse, is a robust three-phase rectifier bridge module engineered for superior thermal performance and long-term reliability in high-power systems. It delivers a formidable combination of high voltage and current handling—1600V | 90A | TVJ max 150°C—making it a cornerstone for industrial power conversion. Key engineering benefits include enhanced power cycling capability and very low forward voltage drop for improved efficiency. This module directly addresses the need for dependable AC-to-DC rectification in harsh industrial environments. For three-phase systems requiring robust rectification up to 90A, the VUO82-16NO7 provides an optimal balance of electrical ruggedness and thermal efficiency.
Key Parameter Overview
Decoding the Specs for Enhanced Thermal Reliability
The technical specifications of the VUO82-16NO7 are tailored for demanding industrial power applications where both electrical ruggedness and thermal stability are critical. The parameters below highlight the module's capacity to deliver reliable performance under significant electrical and thermal stress.
| Parameter | Symbol | Conditions | Value | Unit |
|---|---|---|---|---|
| Electrical Characteristics | ||||
| Maximum Repetitive Reverse Voltage | VRRM | 1600 | V | |
| Average Forward Current | IDAV | TC = 115°C | 90 | A |
| Max. Forward Surge Current | IFSM | t = 10 ms; TVJ = 45°C | 750 | A |
| Forward Voltage Drop | VF | IF = 90A, TVJ = 150°C | 1.33 | V |
| Thermal and Mechanical Specifications | ||||
| Maximum Junction Temperature | TVJ max | 150 | °C | |
| Operating Temperature | Tstg | -40 to +125 | °C | |
| Thermal Resistance, Junction-to-Case | RthJC | 0.9 | K/W | |
| Thermal Resistance, Case-to-Heatsink | RthCH | 0.4 | K/W | |
| Package | - | PWS-D | - | |
Download the VUO82-16NO7 datasheet for detailed specifications and performance curves.
Application Scenarios & Value
System-Level Benefits in Industrial Power Conversion
The VUO82-16NO7 is engineered for core power conversion stages where reliability is non-negotiable. Its primary role is providing the front-end rectification in a wide range of industrial equipment. A key engineering challenge in these systems is managing the initial inrush current and subsequent thermal load during continuous operation. The module's high surge current rating (IFSM) of 750A is critical for surviving the stressful startup of large inductive loads, typical in a Variable Frequency Drive (VFD) or motor controller. This robust surge capability prevents catastrophic failure during power-on, a frequent point of weakness in lesser components. Furthermore, its use of a Direct Copper Bonded (DCB) ceramic substrate provides excellent thermal conductivity. This design choice is analogous to building a bridge with steel-reinforced concrete instead of plain concrete; it dramatically improves the structure's ability to handle stress—in this case, thermal stress from power cycling—ensuring a longer operational life. This makes the VUO82-16NO7 a foundational component for building reliable UPS (Uninterruptible Power Supply) systems, battery chargers, and power supplies for welding equipment. For applications requiring a higher current rating in a similar package, the related VUB120-16NO2 offers an average forward current of 188A.
Frequently Asked Questions (FAQ)
What is the primary advantage of the VUO82-16NO7's package with a DCB ceramic substrate?
The Direct Copper Bonded (DCB) ceramic substrate offers superior thermal performance and power cycling capabilities compared to conventional isolated metal baseplates. This results in lower thermal resistance (RthJC of 0.9 K/W), enabling more efficient heat transfer to the heatsink and improving the module's overall reliability and operational lifespan, particularly in applications with frequent temperature fluctuations.
How does the 1600V reverse voltage rating benefit my design?
The VRRM of 1600V provides a substantial safety margin for applications operating on 400V, 480V, and even up to 690V AC lines. This high blocking voltage capability is crucial for protecting the rectifier from transient overvoltages and line disturbances common in industrial environments, ensuring the long-term integrity of the power supply front-end.
Strategic Advantage in Industrial Systems
Built for Endurance in High-Stress Environments
The design philosophy of the VUO82-16NO7 is centered on durability and thermal efficiency, addressing key strategic needs in modern industrial automation and power infrastructure. The module's construction, featuring planar passivated chips and an industry-standard PWS-D package with an isolated copper baseplate, simplifies mechanical integration while maximizing thermal dissipation. This focus on thermal management is not just about preventing overheating; it directly translates to a higher power cycling capability. In applications like motor drives or renewable energy inverters, where power demand fluctuates constantly, the ability to withstand repeated thermal expansion and contraction cycles is paramount. The VUO82-16NO7's design minimizes mechanical stress on internal components, mitigating common failure modes and extending the service life of the end equipment. This contributes to a lower total cost of ownership, a critical factor for OEMs and system integrators designing for long-term field deployment.
