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1-100218-04

Humidity and Temperature Sensor IC

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Datasheet SHT1x

VDD d1 (°C) d1 (°F) SOT d2 (°C)

5V -40.1 -40.2 14bit 0.01

4V -39.8 -39.6 12bit 0.04

3.5V -39.7 -39.5

3V -39.6 -39.3

2.5V -39.4 -38.9

Table 8: Temperature conversion coefficients.

d2 (°F)

0.018

0.072

4.4 Dew Point

SHT1x is not measuring dew point directly, however dew

point can be derived from humidity and temperature

readings. Since humidity and temperature are both

measured on the same monolithic chip, the SHT1x allows

superb dew point measurements.

For dew point (Td) calculations there are various formulas

to be applied, most of them quite complicated. For the

temperature range of -40 – 50°C the following

approximation provides good accuracy with parameters

given in Table 9:

Td

(RH, T )

=

Tn

⋅

ln RH 

 100% 

m − ln RH

+



m⋅T

Tn + T

− m⋅T

 100%  Tn + T

Temperature Range

Above water, 0 – 50°C

Above ice, -40 – 0°C

Tn (°C)

243.12

272.62

m

17.62

22.46

Table 9: Parameters for dew point (Td) calculation.

Please note that “ln(…)” denotes the natural logarithm. For

RH and T the linearized and compensated values for

relative humidity and temperature shall be applied.

For more information on dew point calculation see

Application Note “Introduction to Humidity”.

5 Environmental Stability

If sensors are qualified for assemblies or devices, please

make sure that they experience same conditions as the

reference sensor. It should be taken into account that

response times in assemblies may be longer, hence

enough dwell time for the measurement shall be granted.

For detailed information please consult Application Note

“Qualification Guide”.

The SHT1x sensor series were tested according to AEC-

Q100 Rev. G qualification test method. Sensor

specifications are tested to prevail under the AEC-Q100

temperature grade 2 test conditions listed in Table 1014.

Sensor performance under other test conditions cannot be

guaranteed and is not part of the sensor specifications.

Especially, no guarantee can be given for sensor

performance in the field or for customer’s specific

application.

Please contact Sensirion for detailed information.

Environment

HTSL

TC

UHST

THU

ESD immunity

Latch-up

Standard

Results15

125°C, 1000 hours

Within

specifications

-50°C - 125°C, 1000 cycles Within

Acc. JESD22-A104-C

specifications

130°C / 85%RH / ≈2.3bar, Within

96h

specifications

85°C / 85%RH, 1000h

Within

specifications

MIL STD 883E, method 3015 Qualified

(Human Body Model at ±2kV)

force current of ±100mA with Qualified

Tamb = 80°C, acc. JEDEC 17

Table 10: Qualification tests: HTSL = High Temperature Storage

Lifetime, TC = Temperature Cycles, UHST = Unbiased Highly

accelerated Stress Test, THB = Temperature Humidity Unbiased

6 Packaging

6.1 Packaging type

SHT1x are supplied in a surface mountable LCC

(Leadless Chip Carrier) type package. The sensor housing

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

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

is fully RoHS and WEEE compliant – it is free of Pb, Cd,

Hg, Cr(6+), PBB and PBDE.

Device size is 7.47 x 4.93 x 2.5 mm (0.29 x 0.19 x 0.1

inch), see Figure 1, weight is 100 mg.

6.2 Traceability Information

All SHT1x are marked with an alphanumeric, three digit

code on the chip cap – see “A5Z” on Figure 1. The lot

numbers allow full traceability through production,

calibration and testing. No information can be derived from

the code directly; respective data is stored at Sensirion

and is provided upon request.

Labels on the reels are displayed in Figures 19 and 20,

they both give traceability information.

14 Sensor operation temperature range is -40 to 105°C according to AEC-Q100

temperature grade 2.

15 According to accuracy and long term drift specification given on Page 2.

www.sensirion.com

Version 5 – December 2011

9/12

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