1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

12

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.

Serie S Speci F icaT ion S

charac T eri ST ic S

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

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

dimen S ion S

(mm)

ordering in F ormaT ion

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