On March 20, 2023, the Automotive Electronics Council (AEC), the requirements physique for automotive digital elements, printed Rev E of AEC-Q200, Stress Take a look at {Qualifications} for Passive Electrical Gadgets. The brand new AEC-Q200 Revision E commonplace provides fuses to the checklist of elements that may be AEC-Q200-qualified in order that the fuses meet a excessive commonplace for ruggedness and reliability. Revision E offers a single commonplace that producers can use to design and take a look at fuses for the automotive market. The fuses should meet a rigorous set of extra thorough assessments that apply extra important stress than the assessments required by requirements for fuses from nationally acknowledged take a look at laboratories resembling UL and CSA.

The requirements outline the compliance necessities that qualify elements that may face up to each the tough automotive setting and extremes within the exterior setting. The elements should go environmental stress assessments resembling temperature biking and humidity. As well as, the elements should go bodily stress assessments resembling shock and vibration.

Littelfuse is the primary automotive fuse producer to introduce a number of AEC-Q200 Revision E-qualified fuses, together with cartridge fuses, floor mount skinny movie chip fuses, excessive present floor mount fuses, and ceramic, fast-acting leaded fuses. View the video.

Wants for fuses in automotive automobile circuits

The addition of electronics applied sciences into automotive autos has been in depth and is continuous. The substantial amount of digital circuitry requires particular person overcurrent safety in every circuit.  Fuses are wanted to guard the battery monitoring system (BMS), the on-board charger (OBC), the facility distribution unit (PDU), the traction motor inverter, the communication circuits, and the imaginative and prescient circuits. Determine 1 reveals the big selection of circuits in electrical autos and lists the sorts of fuses wanted for these circuits.

AEQ-Q200 Rev E Take a look at Requirements

Determine 2 (high) describes the sorts of assessments that the AEC-Q200 commonplace requires elements to go. The assessments fall into two classes: environmental stress and bodily attribute stress. The environmental stress assessments contain testing at excessive temperatures, biking the fuse by means of a large temperature vary, and testing at excessive humidity.  The bodily stress assessments embody mechanical shock, vibration, flammability, resistance to solvents, power of the fuse terminals, and withstanding the warmth from soldering. 

Determine 2 (backside) offers examples of the AEC-Q200 Revision E stress assessments that exceed the necessities of typical fuse take a look at plans. In some instances, the everyday take a look at plan doesn’t even embody an AEC-Q200 Revision E take a look at. In different instances, the brand new AEC-Q200 Revision E take a look at has a 2x to 10x harder requirement than a typical fuse take a look at.

Littelfuse AEC-Q200 Revision E Certified Fuses

Littelfuse has a full portfolio of AEC-Q200 Revision E-qualified fuses. The portfolio consists of cartridge fuses, floor mount fuses, and ceramic fuses. 

Cartridge fuses

The 526 collection, 527 collection, and 828 collection cartridge fuses proven in Determine 3 (high) have present rankings from 15 A to 60 A, with 500 V and 1000 V voltage rankings. The fuses have interrupting rankings of 10 kA and might function in a temperature vary from -55° C to +125° C. They’ve finish caps with built-in stand-off leads or bolt-down choices to eradicate the necessity for mounting equipment or lead-forming processes. These fuses can present overcurrent safety for on-board charger circuits and the facility distribution unit. 

Floor mount fuses

Littelfuse has an in depth line of AEC-Q200 Revision E floor mount fuses. The 885 collection and 881 collection fuses proven in Determine 3 (center) can function in high-voltage circuits with 100 V and 500 V rankings. The 881 collection fuses have present rankings as much as 100 A. Each collection have an interrupting ranking of 1500 A. These compact fuses can shield Li-ion battery modules in battery packs. 

An extra eight households of floor mount fuses are additionally proven in Determine 3 (backside). These space-saving fuses have present rankings from 0.25 A to twenty A. The fuses can function in circuits with voltages as much as 250 V. Their working temperature vary, -55° C to 150° C, is the very best of all of the AEC-Q200 Revision E fuse households. Use the floor mount fuse households in a variety of automotive circuits, together with the battery administration system, the excessive voltage DC-DC converter, the automotive navigation system, the sensor circuits, the thin-film transistor show system, and the leisure methods. 

Ceramic fuses

The PICO® II 521 ceramic fuses are a really fast-acting fuse collection. They’ve present rankings between 2 A and seven A. The 75 V ranking permits use in circuits that function as much as that voltage. These fuses will interrupt a 200% overcurrent in 1 a most of 1 second. They’ll interrupt an overload as much as 300 A. The 8 mm lengthy x 3.4 vast physique saves printed circuit board house and might carry out over the -55° C to +125° C temperature vary.  The PICO II 521 fuses can present overcurrent safety for battery administration system electronics and wire harnesses.

Most in depth portfolio of AEC-Q200 Revision E certified fuses

Littelfuse has a broad fuses portfolio that’s AEC-Q200 Revision E certified for the automotive market. With present rankings from 2 A to 100 A and voltage rankings to 1000 V, Littelfuse has rugged, dependable, stress-tested fuse for each automotive utility. Automotive designers can cut back qualification time for assembly the brand new necessities of the AEC-Q200 Revision E commonplace, and so they can shortly establish Littelfuse overcurrent safety fuses to fulfill all their necessities.

For extra data, go to the AEC-Q200 Revision E Certified Fuses web page and Up to date AEC-Q200 Specs for Automotive Functions presentation at Littelfuse.com.

For a fast introduction to the AEC-Q200 fuse portfolio, view the video. 

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