Home Electric Vehicle Charged EVs | Understanding AEC-Q200 Revision E certified fuses for automotive electronics and EV purposes

Charged EVs | Understanding AEC-Q200 Revision E certified fuses for automotive electronics and EV purposes

Charged EVs | Understanding AEC-Q200 Revision E certified fuses for automotive electronics and EV purposes


On March 20, 2023, the Automotive Electronics Council (AEC), the requirements physique for automotive digital parts, printed Rev E of AEC-Q200, Stress Check {Qualifications} for Passive Electrical Gadgets. The brand new AEC-Q200 Revision E commonplace provides fuses to the listing of parts that may be AEC-Q200-qualified in order that the fuses meet a excessive commonplace for ruggedness and reliability. Revision E supplies 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 checks that apply extra vital stress than the checks required by requirements for fuses from nationally acknowledged take a look at laboratories akin to UL and CSA.

The requirements outline the compliance necessities that qualify parts that may stand up to each the cruel automotive setting and extremes within the exterior setting. The parts should cross environmental stress checks akin to temperature biking and humidity. As well as, the parts should cross bodily stress checks akin to 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 car circuits

The addition of electronics applied sciences into automotive automobiles has been in depth and is constant. 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 automobiles and lists the sorts of fuses wanted for these circuits.


Determine 1. Purposes for AEC-Q200 Rev E certified fuses

AEQ-Q200 Rev E Check Requirements

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

Determine 2. AEC-Q200 Revision E Checks


Determine 2 (backside) provides examples of the AEC-Q200 Revision E stress checks that exceed the necessities of typical fuse take a look at plans. In some circumstances, the everyday take a look at plan doesn’t even embrace an AEC-Q200 Revision E take a look at. In different circumstances, 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 contains cartridge fuses, floor mount fuses, and ceramic fuses. 

Determine 3. Littelfuse AEC-Q200 Revision E Certified Fuses Portfolio

Cartridge fuses

The 526 collection, 527 collection, and 828 collection cartridge fuses proven in Determine 3 (high) have present scores from 15 A to 60 A, with 500 V and 1000 V voltage scores. The fuses have interrupting scores 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 remove 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 intensive 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 scores. The 881 collection fuses have present scores as much as 100 A. Each collection have an interrupting score of 1500 A. These compact fuses can defend 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 scores 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 scores between 2 A and seven A. The 75 V score 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 broad physique saves printed circuit board area 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 scores from 2 A to 100 A and voltage scores 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 satisfy all their necessities.

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

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

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