Resistors offer lower operating temps at rated power

Stackpole has developed metal electrode leadless face (MELF) resistors that it says offer significantly lower operating temperatures at rated power compared to similar sized flat chip resistors.

Dubbed the MLF and MLFM series, these resistors have a cylindrical form that increases the surface area exposed to the air and disperses the heat generated from the part to the air more efficiently. The 0204 size runs at only 55C at ½ watt and the 0207 size runs at only 67C at 1 watt.  For comparison, standard 2010 thick film flat chip resistors will run at around 140C and 2512's will run at around 150C assuming equivalent board materials and design. This improvement allows design engineers more flexibility in design layout and can also allow downsizing or adding functionality to existing designs.

The MLF and MLFM Series are suitable for a wide variety of power supplies requiring higher power density or lower self heating. Additional applications include industrial controls, utility metering, automotive instrumentation, heavy equipment instrumentation,
medical instrumentation and monitoring, test equipment and instrumentation, and audio equipment.

Key highlights:

• Available in 0204 and 0207 sizes in ¼ watt, ½ watt and 1 watt power ratings
• Resistance values from 1 ohm to 10Meg ohms
• Tolerances as low as 0.1%
• TCR's as low as 10 ppm

Pricing: Varies with size, tolerance, and TCR and ranges from $0.018 each to $0.47 each in full reel quantities.

Availability: Now.

Datasheet: Click here.