FST

FST OHMITE | Alldatasheet

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1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com12 FST Series Thin Film Temperature Sensor The FST series design positions the contact surfaces on the side with the active measuring layer. This design produces a sensor in position for face-down mounting. This mounting optimizes current trends in the ‘adhesion instead of soldering’ electronics sec- tor. Using conductive adhesives provides reliable and cost-effective connection to the circuit board and is an alternative to the conventional reflow or wave soldering. The FST series is available in 2 tolerance classes, 0.12% and 0.24% per the DIN EN 60751 specification. Both tolerance classes are available in the three resistance levels of the FST series. SerieS SpeciFica TionS characTeriSTicS Specification DIN EN 60751 Tolerance Class B (R0: ± 0.12 %), Class 2B (R0: ± 0.24 Temperature range -50 °C to 170 °C Temp. coefficient TCR = 3850 ppm/K Contact AgPd metallising in thick-film technology Long-term stability R0 drift ≤ 0.06 % after 1000 h at 170°C Ambient conditions Use unprotected only in dry environments Insulation resis- tance > 100 MW at 20°C; > 2 MW at 170°C (glass cover) Measuring current 100 W: 0.3 to 1.0 mA 500 W: 0.1 to 0.7 mA 1000 W: 0.1 to 0.3 mA (self heating has to be considered) Self heating 0.8 K/mW at 0°C Reaction time Flowing water (v = 0.4 m/s): t0.5 = 0.10 s, t0.9 = 0.25 s Air flow (v = 2 m/s): t0.5 = 2.5 s, t0.9 = 8.0 s Processing infor- mation

• Reflow soldering or wave soldering, e.g. double wave soldering < 8 s / 235°
• Also can be mounted using SMD insertion machines with Ag conductive adhesive.
• When mounting PCB circuits, the expansion relationship of the sensor and the substrate material must be taken into account. Storage life Stored in a nitrogen atmosphere, min. 9 months Packaging "Face-down" in blister reel, 1000 pcs / reel dimenSionS (mm) ordering inForma Tion rev 12/17-2 2.1mm ±.15 1.35mm ±.15 0.4mm ±.05 0.4mm ±.2 Nom. Resistance Tolerance Model (ohms) Class FST08-B-100E 100 B FST08-2B-100E 100 2B FST08-B-500E 500 B FST08-2B-500E 500 2B FST08-B-1K0E 1000 B FST08-2B-1K0E 1000 2B Other tolerances and values of resistance are available on request. Resistance taken at 0°C FST08-2B-100RE Series Tolerance Resistance value RoHS Compliant