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Mega-Fit Connectors

Mega-Fit Connectors

As next-generation devices require more functionality, speed and power, design engineers face the challenge of delivering increased current in space-constrained designs. Mega-Fit connectors deliver superior performance in low to mid-power applications by handling high currents up to 30A. With an innovative compact design, these robust connectors are engineered to withstand the rigorous demands of USCAR-2 standards and are ideal for challenging environments. These products also offer a diverse range of features, including terminal position assurance (TPA), connector position assurance (CPA) and potting capabilities for secure connections and long-term reliability. Offering unmatched flexibility to meet various manufacturing demands, the Mega-Fit Connector portfolio is an exceptional choice for your design needs.

Current Pitch Wire Gauge Operating Temperature
Up to 30.0A 5.70mm 18 to 10 AWG -40 to +105°C (tin), -40 to +120°C (gold)

PCB Headers

Molex Mega-Fit PCB header

Receptacle Housings

Molex Mega-Fit receptacle housing

Plug Housings

Molex Mega-Fit plug housing

Crimp Terminals

Molex Mega-Fit crimp terminal

Cable Assemblies

Molex Mega-Fit cable assembly

Pre-Crimped Leads

Molex Mega-Fit pre-crimped lead

Connector Accessories

Molex Mega-Fit receptacle backshell

Features and Benefits


As applications require compact components, designers must meet ever-increasing current and power needs while also minimizing PCB footprints to conserve valuable board space. Support for diverse mechanical, electrical and environmental design requirements across multiple applications and platforms is also a challenge. Connection failures due to improper mating and operator fatigue are additional concerns in demanding assembly and operating environments.

High power density solutions in a compact connector platform enable more power per linear and square millimeter of PCB space. Diverse configuration options that accommodate a wide range of application-specific requirements and system architectures create more design flexibility for engineers. Improving assembly efficiency and providing robust mechanical retention support accurate mating and reliable, secure connections.

Supporting up to 30.0A per circuit, Mega-Fit Connectors maximize power delivery in space-constrained designs, providing a compact, high-current connector solution. Isolated contacts, mechanical keying options, potting-capable headers, blind-mating capability, color-coded housings and terminal position assurance (TPA) configurations help simplify system design and circuit identification, for accurate, secure mating. A robust positive-lock latch system and a tangless terminal design enhance retention, help prevent mis-mating and ensure long-term electrical reliability.

Delivering More Power in Less Space

Supporting up to 30.0A per circuit in a 5.70mm-pitch design, Mega-Fit Connectors deliver high-power performance while conserving valuable PCB real estate. In a compact wire-to-board connector platform, these space-saving connectors maximize power density.

Molex Mega-Fit right-angle header

Design Flexibility and Secure Mating

With a wide selection of flexible design options, Mega-Fit Connectors meet diverse application, assembly and system-architecture requirements. Features include connector position assurance (CPA) for the single-row version, blind-mating interfaces and TPA, simplifying integration for a broad range of power applications.

Molex Mega-Fit dual-row receptacle with TPA.

Meets Industry Standards in Challenging Environments

Glow Wire compliant and USCAR-2 tested, Mega-Fit Connectors support safety requirements, improve connection retention and ensure long-term performance in crucial applications. These power connectors, used in appliances, automotive and industrial equipment, are engineered to withstand vibration, mechanical stress and elevated temperatures, providing secure, reliable power connections in demanding operating environments.

Molex Mega-Fit single-row connector with TPA.

Color-Coded and Keyed for Faster Assembly

Mega-Fit ColorLock Connectors provide visual differentiation that improves connector identification throughout the product lifecycle, reducing assembly errors and simplifying maintenance. Distinct color-coded housings and keying features accelerate assembly, support field servicing and ensure proper mating the first time.

Molex Mega-Fit ColorLock receptacle housings.

Allows same-circuit, multiple-connector use with a limited chance of cross mating; provides visual indication of the properly mated connector for faster assembly
There are multiple mechanical keying and color-coded options with polarization for operational safety and efficient assembly.

Offers a compact mid-power solution
A small pitch size allows these connectors to take up less space on the PCB and provide the power that designers require in a limited space.

Ensures mated connector assemblies will not accidentally disengage
The TPA feature reduces assembly errors and ensures terminals are fully seated and will not back out. These connectors also offer a CPA option for additional locking security.

Meets USCAR-2 specifications for shock and vibration
These connectors are suitable for use in most automotive applications, except for safety or on-engine applications.

Helps prevent dust and moisture at lower costs than sealed products
Potting capable headers ensures environmental protection and long-term reliability.

Creates space efficiency, optimal current paths, and enhanced robustness and reliability
Unique terminal designs use two similar wire gauges in one terminal and include double-crimp option.

Reduces the risk of handling and transit damage
A tangless terminal design is available with TPA receptacles only.

Videos


Mega-Fit Connectors

Overcoming the challenge of meeting high-current needs in a small package, Mega-Fit Connectors provide a compact wire-to-wire and wire-to-board power interconnect solution, delivering high current in increasingly compact equipment while maintaining reliable power connections in demanding environments. Supporting up to 30.0A per circuit with multiple points of contact, these products also feature positive locking and optional TPA functionality for secure retention. Mega-Fit Connectors maximize power density, improve connection reliability and reduce the risk of mis-mating in data center, industrial equipment, telecommunications infrastructure, automotive and appliance applications.

Low-Power and Signal Potting-Capable Connectors

Molex potting-capable connectors support encapsulated PCB designs while maintaining reliable low-power and signal connectivity in harsh operating environments. Moisture, dust, vibration and other environmental factors can compromise sensitive electronics and reduce system reliability. Potting-compatible connector designs protect crucial electrical connections, improve durability and increase long-term system reliability while supporting efficient manufacturing processes.

Applications by Industry


Interior dashboards
Lighting and automation systems
Power converters
Telemetrics
Unsealed electronic control modules

Power distribution systems​
Power supply and battery backup units

Power distribution systems
Power Supplies
Servers
Switches

This is not a definitive list of applications for this product. It represents some of the more common uses.

Frequently Asked Questions


What are Mega-Fit Connectors?

Mega-Fit Connectors are high-current wire-to-wire and wire-to-board power connectors designed to deliver up to 30.0A per circuit in a compact 5.70mm-pitch package. They are engineered for applications requiring reliable power distribution, high current density and robust mechanical performance in space-constrained designs. Multiple points of electrical contact, positive locking features and optional TPA functionality improve connection reliability across industrial, appliance, telecommunications, commercial vehicle and data center applications.

How much current do Mega-Fit Connectors carry?

Mega-Fit Connectors support up to 30.0A per circuit, making them suitable for power distribution applications that require higher current capacity than many conventional wire-to-board connector systems. The connector design has multiple independent contact points to maximize current-carrying capability while maintaining a compact footprint and reliable electrical performance.

In what kind of applications can Mega-Fit Connectors be used?

Mega-Fit Connectors are commonly used in power supplies, power distribution units, server and storage equipment, industrial automation systems, telecommunications infrastructure, commercial vehicles, renewable energy equipment and consumer appliances. These applications benefit from the connector's ability to deliver high current levels, while maintaining reliable operation in environments where vibration, temperature variation and continuous power transmission are important design considerations.

What makes Mega-Fit Connectors suitable for high-current power distribution?

Mega-Fit Connectors are designed specifically for high-current power distribution applications that require exceptional electrical performance and mechanical reliability. The system incorporates six independent points of contact, high-conductivity terminals, a robust housing design and positive locking features to maintain stable electrical connections while supporting high current loads. This helps reduce the risk of intermittent connections and supports efficient power delivery in demanding operating environments.

What are Mega-Fit ColorLock Connectors?

Mega-Fit ColorLock Connectors are color-coded and mechanically keyed versions of the Mega-Fit connector family that help prevent connector mis-mating during assembly and maintenance. By combining unique housing colors with corresponding mechanical key patterns, ColorLock connectors make it easier for operators and technicians to identify correct mating pairs. This reduces wiring errors, assembly time and the risk of equipment damage caused by incorrect connections.

How do Mega-Fit ColorLock Connectors help prevent connector mis-mating?

Mega-Fit ColorLock Connectors help prevent connector mis-mating through a combination of visual color coding and mechanically keyed housing designs. Each color corresponds to a specific key pattern, ensuring that only compatible connectors can mate together. This approach helps eliminate wiring errors in assemblies containing multiple similar connectors and improves installation accuracy, production efficiency and long-term system reliability.

Are Mega-Fit Connectors designed for harsh environments?

Yes, Mega-Fit Connectors are designed for harsh operating environments where shock, vibration and temperature fluctuations may affect connector performance. Features such as positive locking, high-retention terminals, robust housing materials and optional TPA functionality help maintain connection integrity in demanding industrial, transportation and power infrastructure applications. Specific Mega-Fit products are also designed to support stringent performance requirements for applications exposed to mechanical stress and environmental challenges.

Do Mega-Fit Connectors support PCB potting?

Select Mega-Fit headers support PCB potting processes used to improve environmental sealing and mechanical protection. Potting helps protect electronic assemblies from moisture, contamination and vibration while maintaining connectivity. Molex provides potting-capable connector options and application guidelines, enabling engineers to incorporate additional environmental protection where required.

What wire gauges are supported by Mega-Fit Connectors?

Mega-Fit Connectors support a range of wire sizes commonly used in high-current applications, including wire gauges from 18 to 10 AWG, with additional options available for specific configurations. This flexibility enables engineers to optimize conductor sizing based on application power requirements while maintaining reliable termination performance and efficient power transmission.

What is the difference between Mega-Fit and Mini-Fit Connectors?

Mega-Fit Connectors are designed for applications requiring high current capacity and support up to 30.0A per circuit with a 5.70mm pitch, while Mini-Fit Connectors provide a smaller-pitch solution for designs requiring high circuit density and low current requirements. Engineers typically select Mega-Fit Connectors when power delivery, current-carrying capability and mechanical robustness are crucial design considerations.

What do color coding and mechanical keying mean?

Mega-Fit ColorLock Connectors are visually color-coded and mechanically keyed to create a design on the molded housing that helps prevent mis-mating. Color coding means correctly mated connectors are the same color and incorrect combinations will have different colors. Natural-colored components mate to natural-colored components, and black mates to black. Keying means specific shapes, sizes and positions can mate if they match. If the connectors do not have complementary keying, they will not mate.

What is the benefit of using the double-crimp feature?

The double-crimp feature enables the termination of two wires in a single contact, eliminating the need for a separate splice. This simplifies wire harness design, reduces component count and assembly complexity, and can help lower overall harness cost while improving wiring efficiency.

Fit Family Connectors

Engineers require flexible interconnect solutions that can adapt to different power needs while maintaining design consistency. The Molex Fit Family offers a broad portfolio of connectors designed to scale performance across a single platform. By combining compact form factors, high current capacity and connector options that inhibit mis-mating, these connectors simplify assembly and enable efficient, reliable designs.

Molex Fit Family connectors