Datasheet

www.sensirion.com Version 2 – December 2011 1/5
Datasheet Filter Cap SF2
For Humidity and Temperature Sensor SHT2x
 Protection against dust and particles
 Protection against water immersion
 Designed to match on SHT2x DFN type sensors
 Optimized for response time of sensor
Dimensions
Figure 1: Drawing of the filter cap SF2 (body only). Dimensions
are given in mm (1mm = 0.039inch), tolerances are ±0.1mm.
Add 0.15 to total height due to the filter membrane. The cavity
inside the cap fits to SHT2x sensors. Additional space for solder
joints are left open around the sensor.
Technical Specifications
Parameter
Value
Operating Range
-40 … 125°C
IP
1
IP67
RoHS
Compliant
Body material
Polybutylene Terephthalate
(PBT)
Body Color
Black
UL94 (Body material only)
UL94 V-0 (0.73mm)
Filter material
PTFE with polyester scrim
Filter Color
Black
Filter Thickness
0.13 mm
Filter pore size
1.5 μm
Filtration efficiency
2
99.99%
Oleophobic Rating (Filter)
3
8
Mullen Hydrostatic
>100mbar (>1m water)
1
IP67: dust tight, protected against harmful water immersion up
to 1m water column. (http://en.wikipedia.org/wiki/IP67) .
To achieve IP67 at the connections between the housing or
the PCB and the SF2 is up to the customer.
2
0.1µm particles at 0.05m/s air flow.
3
Repellence of oil and hydrocarbons according to
AATCC 118-1992 standard. Rating goes from 0 – 8 while 8 is
most repellent.
A-A
1.2
0.5
1.4
1.9
1.5
0.27
Ø 3.0
Ø 5.05
3.4
SHT21
0.65
0.95
R0.5
0.2
A
A
R3.2
4.0
3.4
1.0
6.0
Product Summary
The filter cap SF2 protects SHT2x humidity and
temperature sensors against dust, water immersion as
well as against contamination by particles. The cavity
inside is made such that the volume between membrane
and sensor is kept minimal and hence the impact on
response time for humidity measurements is reduced to a
minimum. The filter cap SF2 is available in black color
with a black filter membrane.
The filter cap SF2 is made of a single piece of
Polybutylene Terephthalate (PBT) with a filter membrane
welded on it. The SF2 filter cap is designed to be mounted
after soldering by clipping the four pins into openings in
the PCB. Together with the sensor it provides a compact
entity which may serve as an adaptor to the device
housing. Adding adhesive for seal to PCB and using an o-
ring it serves for a waterproof mounting solution.