SHT25 datasheet(10/12 Pages) ETC2

10 / 12 page

Datasheet SHT25

www.sensirion.com

Version 0.91 – October 2010

10/12

125

⋅

−

In the example given in Figure 15 and Figure 16 the

relative humidity results to be 42.5%RH.

The physical value RH given above corresponds to the

relative humidity above liquid water according to World

Meteorological Organization (WMO). For relative humidity

above ice RHi the values need to be transformed from

relative humidity above water RHw at temperature t. The

equation is given in the following, compare also

Application Note “Introduction to Humidity:













⋅













⋅

exp

Units are %RH for relative humidity and °C for

temperature. The corresponding coefficients are defined

as follows: βw = 17.62, λw = 243.12°C, βi = 22.46, λi =

272.62°C.

6.2

Temperature Conversion

The temperature T is calculated by inserting temperature

signal output ST into the following formula (result in °C), no

matter which resolution is chosen:

175.72

46.85

⋅

−

7 Environmental Stability

The SHT2x sensor series were tested according to AEC-

Q100

Rev.

qualification

test

method.

Sensor

specifications are tested to prevail under the AEC-Q100

temperature grade 2 test conditions listed in Table 916.

Environment Standard

Results17

HTOL

125°C, 1000 hours

Within

specifications

-50°C - 125°C, 1000 cycles

Within

specifications

UHST

130°C / 85%RH / ≈2.3bar, 96h Within

specifications

THB

85°C / 85%RH, 1000h

Within

specifications

ESD immunity HBM

±4kV, MM ±200V, CDM

750V/500V (corner/other pins)

Qualified

Latch-up

force current of ±100mA with

Tamb = 125°C

Qualified

Table 9: Performed qualification test series. HTOL = High

Temperature Operating Lifetime, TC = Temperature Cycles,

UHST = Unbiased Highly accelerated Stress Test, THB =

Temperature Humidity Biased. For details on ESD see Sect. 4.1.

16 Temperature range is -40 to 105°C (AEC-Q100 temperature grade 2).

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

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.

If sensors are qualified for reliability and behavior in

extreme conditions, 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 “Testing

Guide”.

8 Packaging

8.1

Packaging Type

SHT2x sensors are provided in DFN packaging (in

analogy with QFN packaging). DFN stands for Dual Flat

No leads.

The sensor chip is mounted to a lead frame made of Cu

and plated with Ni/Pd/Au. Chip and lead frame are over

molded by green epoxy-based mold compound. Please

note that side walls of sensors are diced and hence lead

frame at diced edge is not covered with respective

protective coating. The total weight of the sensor is 25mg.

8.2

Filter Cap and Sockets

For SHT2x a filter cap SF2 will be provided. It is designed

for fast response times and compact size. Please find the

datasheet on Sensirion’s web page.

For testing of SHT2x sensors sockets, such as from

Plastronics,

part

number

10LQ50S13030

are

recommended (see e.g. www.locknest.com).

8.3

Traceability Information

All SHT2x are laser marked with an alphanumeric, five-

digit code on the sensor – see Figure 19.

The marking on the sensor consists of two lines with five

digits each. The first line denotes the sensor type

(SHT25). The first digit of the second line defines the

output mode (D = digital, Sensibus and I2C, P = PWM, S =

SDM). The second digit defines the manufacturing year (0

= 2010, 1 = 2011, etc.). The last three digits represent an

alphanumeric tracking code. That code can be decoded by

Sensirion only and allows for tracking on batch level

through production, calibration and testing – and will be

provided upon justified request.

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