Automotive-Grade Surface-Mount Fuses Deliver High Performance and Reliability


Components Bureau introduces a new line of AEC-Q200 qualified surface mount fuses designed specifically for reliable operation in high-stress automotive applications.

AEM manufacturers the wire-in- air AirMatrix (QA Series) and solid body SolidMatrix (QF Series) fuses in its TS16949-certified facility. Both products offer automotive design engineers reliable performance in applications ranging from engine controls and battery-management systems to infotainment and communications systems.

The QA series features the industry’s highest current ratings up to 20A/250V. Its hermetically-sealed wire-in- air structure assures consistent electrical performance, The QF solid-body fuses features an anti-sulphur end-cap construction and provides superior mechanical and thermal stability over a wide temperature range (-55 to +150°C).

The fusible element in the QA Series wire-in- air devices is uniformly straight across the internal cavity and bonded externally to the endcap through the plating process. The traditional approach uses solder beads inside a ceramic tube to bond the fusible link, which has the drawback of non-uniform performance and potential internal connection failure.

“Under high-stress conditions, the solder can vaporise, causing prolonged arcing that can lead to package failure and damage to the circuit board and surrounding components,” explains Andrew Ferrier, General Manager at Components Bureau. “In comparison, the new automotive-grade fuses
enhance reliability in harsh environments by eliminating the solder joint.”

The QA Series is available in two fast-acting versions: a 2410 package with a 0.5-20A/65- 250V rating and a 1206 package rated at 1.5-15A/32- 65V. Auto-grade QF parts are offered in fast-acting and time-lag versions, and in 1206 and 0603 versions with current ratings up to 8A.

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