OrCAD vs Allegro vs Altium: Product Comparison Guide

In electronic design automation (EDA), choosing the right software can be difficult. Engineers designing printed circuit boards (PCBs) often find themselves weighing the merits of the tools. This comparative piece highlights the key differences and strengths of OrCAD, Allegro, and Altium Designer, focusing on their technical capabilities and target applications. The decision between OrCAD vs Allegro vs Altium often hinges on specific project requirements, team size, design complexity, and budget considerations.

Each of these platforms brings unique advantages to the table, catering to different segments of the electronics industry. Altium Designer is known for its unified design environment and user-friendliness, while Cadence’s OrCAD and Allegro offerings are recognized for their deep feature sets, scalability, and handling of intricate, high-performance designs.

OrCAD vs Allegro vs Altium Product Comparison: Features and Benefits

Cadence OrCAD: Accessible Professional Design

Cadence OrCAD provides a capable and scalable solution suitable for a wide range of PCB designs. It’s often considered a more accessible entry point into the Cadence ecosystem, delivering substantial power without complexity.

OrCAD is a comprehensive suite that typically includes OrCAD Capture for schematic design, PSpice for circuit simulation, and OrCAD PCB Designer for layout and routing. It’s a popular choice for engineers and teams needing professional-grade tools for contemporary designs.

OrCAD Pros:

• Scalability and Investment Protection: OrCAD’s greatest strength is its scalability. Built upon a shared foundational data model and design environment with Allegro, users can start with OrCAD and upgrade to more advanced Allegro licenses as design requirements grow more complex, preserving their initial investment and data.
• Comprehensive Front-to-Back Flow: OrCAD provides a fully automated design flow, from schematic capture and component selection to PCB layout, including component placement, trace routing, and manufacturing outputs. Its integrated PSpice simulation capabilities enable thorough circuit analysis early in the design cycle, identifying potential functional issues.
• Effective Constraint Management: OrCAD incorporates a powerful constraint management system that enables designers to define physical, spacing, and electrical rules. The spreadsheet-style interface makes it straightforward to define, manage, and validate rules, with real-time feedback during layout.
• Intuitive Schematic Capture and Libraries: OrCAD Capture is widely regarded for its ease of use in creating hierarchical schematics and its extensive component libraries, which streamline the design entry process.

OrCAD Cons:

• Adjustment to Layout Interface: While OrCAD Capture is generally intuitive, the PCB Editor, which shares roots with Allegro, can initially feel like a slightly different approach for layout tasks compared to some other tools. However, users quickly adapt to its specific workflow and appreciate its versatility and power. With the new Presto interface, users will be able to get the best mix of performance and usability.

Cadence Allegro: For Advanced Design

Cadence Allegro stands in the EDA landscape as a favorite by larger enterprises and for the most demanding PCB designs.

Allegro provides a comprehensive environment for schematic capture, PCB layout, signal integrity (SI) and power integrity (PI) analysis, RF, and manufacturing preparation. Its capabilities are heavily relied upon in sectors such as aerospace, automotive, telecommunications, and high-performance computing.

Allegro Pros:

• Performance for Complex Designs: Allegro excels with high-density interconnect (HDI) PCBs, complex multi-layer boards, and designs requiring precise control over high-speed signals and RF routing. It’s built for performance and capacity, effortlessly handling designs with thousands of pins and multi-gigahertz clock rates.
• Constraint-Driven Methodology: One of Allegro’s key strengths is its robust constraint management system. Designers can define electrical and physical constraints upfront, and the tool enforces these rules throughout the design process, ensuring accuracy and reducing costly re-spins. This includes comprehensive support for timing, reflection, crosstalk, differential pairs, and simultaneous switching noise (SSN), making it invaluable for advanced SI/PI challenges.
• Deep Integration within the Cadence Ecosystem: Allegro is part of the broader Cadence suite, allowing for integration with specialized tools for advanced simulation, analysis, and system-level design. This cohesive environment fosters a workflow from concept to manufacturing.
• Advanced Analysis and Manufacturing Preparation: With integrated tools for signal integrity, power integrity, and thermal analysis, Allegro enables designers to identify and proactively mitigate potential issues. Its manufacturing preparation capabilities generate industry-standard outputs, such as Gerber files, ODB++, and drill data, with precision.

Allegro Cons:

• Initial Learning Investment: Allegro’s extensive feature set and unique, powerful workflow might require a committed learning investment for new users. However, this effort quickly pays off in handling the most advanced design challenges with precision and efficiency.

Altium Designer: The Unified Design

Altium Designer has carved out a niche with its unified design environment and focus on user experience, aiming to provide a comprehensive solution for the entire PCB design process in a single application.
Altium Designer integrates schematic capture, PCB layout, FPGA design, and embedded software development, all within one consistent interface. This approach is designed to eliminate the friction of switching between tools.

Pros:

• Unified Design Environment: This is Altium’s flagship feature. Having all design aspects under one roof streamlines the workflow and can enhance productivity by reducing context switching.
• User-Friendly Interface: Altium Designer is frequently praised for its visually appealing user interface, making it relatively easier for new users to pick up. Its approach often features more visual processes and wizards.
• 3D Visualization and MCAD Integration: Altium offers detailed 3D PCB visualization, enabling designers to check mechanical fit and form factors in real-time. This is particularly valuable for ECAD-MCAD co-design, as it integrates with mechanical CAD tools for seamless collaboration.
• Rigid-Flex and Multi-Board Design: Altium Designer offers support for advanced board technologies, including rigid-flex PCBs and multi-board system design, with tools for defining regions, bending lines, and managing stack-ups.

Cons:

• Constraint Management Workflow: While Altium has constraint management, some experienced users suggest that the process of setting up and applying very complex rules can sometimes require a different approach compared to the top-down, spreadsheet-based methods found in Cadence tools.
• Performance Impacts: Some users will disable design features, such as copper pours, or make them static to avoid performance lag. These features must then be turned back on at the end of the PCB design to verify its integrity.

OrCAD vs Allegro vs Altium: Our Pick

When considering OrCAD vs Allegro vs Altium, the “best” tool is inherently tied to the project’s specific demands and the organization’s strategic objectives. For those navigating the full spectrum of PCB design, from mainstream applications to the most advanced, high-performance systems, Cadence’s offerings present a compelling and cohesive ecosystem. OrCAD provides a highly capable and scalable foundation, ideal for mainstream designs and offering an upgrade path to the extensive capabilities of Allegro.

EMA Design Automation is a leading provider of the resources that engineers rely on to accelerate innovation. We provide solutions that include PCB design and analysis packages, custom integration software, engineering expertise, and a comprehensive academy of learning and training materials, which enable you to create more efficiently. For more information on OrCAD vs Allegro vs Altium and how we can help you or your team innovate faster, contact us.