SHT1x / SHT7x Relative Humidity & Temperature Sensor System

www.sensirion.com

v2.02 July 2004

7/9

5 Package Information

5.1 SHT1x (surface mountable)

Table 10 SHT1x Pin Description

5.1.1 Package type

The SHT1x is supplied in a surface-mountable LCC

(Leadless Chip Carrier) type package. The sensors housing

consists of a Liquid Crystal Polymer (LCP) cap with epoxy

glob top on a standard 0.8 mm FR4 substrate. The device is

free of lead, Cd and Hg.

Device size is 7.42 x 4.88 x 2.5 mm (0.29 x 0.19 x 0.1 inch)

Weight 100 mg

The production date is printed onto the cap in white numbers

in the form wwy. e.g. ”351” = week 35, 2001.

5.1.2 Delivery Conditions

The SHT1x are shipped in 12mm tape at 100pcs or 400pcs..

Reels are individually labelled with barcode and human

readable labels. The Lot numbers allow full traceability

through production, calibration and test.

Cover Tape

Carrier Tape

Leader Tape

480mm minimum

Trailer Tape

300mm minimum

Components

2.8mm

Figure 12 Tape configuration and unit orientation

5.1.3 Soldering Information

Standard reflow soldering ovens may be used

. For details

please see application note "soldering procedure".

For manual soldering contact time must be limited to 5

seconds at up to 350 °C.

After soldering the devices should be stored at >74 %RH for

at least 24h to allow the polymer to rehydrate.

Please consult the application note “Soldering procedure” for

more information.

5.1.4 Mounting Examples

Figure 13 SHT1x PCB Mounting example

The SF1 membrane filter cap is available for optimal IP67

protection. When mounted through a housing the interior can

be protected from the environment while still allowing high

quality humidity measurements (see example below).

housing

housing

PCB

o-ring

SHT1x

Filtercap

melted plastic pin

Figure 14 SF1 IP67 filter cap mounting example

Pin Name

Comment

1

GND

Ground

2

DATA

Serial data, bidirectional

3

SCK

Serial clock, input

4

VDD

Supply 2.4 - 5.5 V

NC

Remaining pins must be left unconnected

7.08 (0.278)

4.88 (0.19)

2.44

(0.1)

1

2

3

4

sensor opening

NC

NC

NC

NC

NC

NC

1.9

(0.07)

1.49

(0.06)

1.15

(0.04)

actual size

Top View

Side View

Recommended PCB Footprint

1.8

(0.07)

1.8

(0.07)

3.48 (0.137)

Figure 15 SHT1x drawing and footprint dimensions in mm (inch)

Slit to minimize heat

transfer from the PCB