Precise temperature compensation with surface-mount thermistors

October 04, 2013 // By Julien Happich
Ametherm’s new series of surface-mount thermistors is aimed at high-accuracy temperature compensation and measurement. The SM04, SM06, and SM08 series devices offer designers a choice of 125, 200 and 250 mW maximum power ratings, respectively, and dissipation constants of 1.10, 1.50 and 2.00mW/°C.

With thermal time constants down to 1.5 seconds and low profiles to 0.35 mm, the thermistors offer very fast response times while saving space in LCD controls, relay coils, crystal oscillators, and hybrid circuits. Providing a cost-effective alternative to radially leaded NTC and through-hole thermistors, SM04, SM06, and SM08 devices lower costs by supporting auto insertion during manufacturing.

The devices come with resistance values ranging from 200Ω to 470 kΩ with tolerances down to 1%, beta from 2500°K to 4500°K, and an operating temperature range of -40 to +125°C. Designed with nickel barrier terminations, the chips are suitable for wave and reflow soldering and offer a moisture sensitivity level of 2 for high reliability.