On March 20, 2023, the Automotive Electronics Council (AEC), the requirements physique for automotive digital parts, revealed Rev E of AEC-Q200, Stress Take a look at {Qualifications} for Passive Electrical Units. The brand new AEC-Q200 Revision E commonplace provides fuses to the record of parts 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 check fuses for the automotive market. The fuses should meet a rigorous set of extra thorough checks that apply extra important stress than the checks required by requirements for fuses from nationally acknowledged check laboratories reminiscent of UL and CSA.

The requirements outline the compliance necessities that qualify parts that may face up to each the tough automotive surroundings and extremes within the exterior surroundings. The parts should cross environmental stress checks reminiscent of temperature biking and humidity. As well as, the parts should cross bodily stress checks reminiscent of 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 automobiles has been intensive 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 automobiles and lists the forms of fuses wanted for these circuits.

AEQ-Q200 Rev E Take a look at Requirements

Determine 2 (prime) describes the forms 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 a large temperature vary, and testing at excessive humidity.  The bodily stress checks embody mechanical shock, vibration, flammability, resistance to solvents, power of the fuse terminals, and withstanding the warmth from soldering. 

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

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 sequence, 527 sequence, and 828 sequence cartridge fuses proven in Determine 3 (prime) 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 may 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 in depth line of AEC-Q200 Revision E floor mount fuses. The 885 sequence and 881 sequence fuses proven in Determine 3 (center) can function in high-voltage circuits with 100 V and 500 V scores. The 881 sequence fuses have present scores as much as 100 A. Each sequence have an interrupting ranking 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 programs. 

Ceramic fuses

The PICO® II 521 ceramic fuses are a really fast-acting fuse sequence. They’ve present scores 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 large physique saves printed circuit board house and may 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 intensive 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 scale 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 Functions presentation at Littelfuse.com.

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

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