Datasheet SHT21

www.sensirion.com

Version 1.0 – January 2010

10/12

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 “Qualification

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 by February 2010.

For testing of SHT2x sensors sockets, such as from

Plastronics,

part

number

10LQ50S13030

are

8.3

Traceability Information

All SHT2x are laser marked with an alphanumeric, five-

digit code on the sensor – see Figure 17.

The marking on the sensor consists of two lines with five

digits each. The first line denotes the sensor type

(SHT21). The first digit of the second line defines the

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.

Figure 17 Laser marking on SHT21. For details see text.

Reels are also labeled, as displayed in Figure 18 and

Figure 19, and give additional traceability information.

Figure 18: First label on reel: XX = Sensor Type (21 for SHT21),

O = Output mode (D = Digital, P = PWM, S = SDM), NN = Chip

Version, Y = last digit of year, RRRR = number of sensors on

reel, TTTT = Traceability Code.

Figure 19: Second label on reel: For Device Type and Part

Order Number (See Packaging Information on page 2), Delivery

Date (also Date Code) is date of packaging of sensors (DD =

day, MM = month, YYYY = year), CCCC = Sensirion order

number.

8.4

Shipping Package

SHT2x are provided in tape & reel shipment packaging,

sealed into antistatic ESD bags. Standard packaging sizes

are 400, 1500 and 5000 units per reel. For SHT21, each

reel contains 440mm (55 pockets) header tape and

200mm (25 pockets) trailer tape.

The drawing of the packaging tapes with sensor

orientation is shown in Figure 20. The reels are provided in

sealed antistatic bags.

Figure 20 Sketch of packaging tape and sensor orientation.

Header tape is to the right and trailer tape to the left on this

sketch.

8.0

2.0

4.0

0.3

1.3

R0.3 MAX

R0.25

Ø0.15 MIN

Ø0.15 MIN

3.3

0.25

SHT21

D0AC4

Device Type:

1-100PPP-NN

Description:

Humidity & Temperature Sensor

SHTxx

Part Order No.

1-100PPP-NN or Customer Number

Date of Delivery: DD.MM.YYYY

Order Code:

45CCCC / 0

Lot No.:

XXO-NN-YRRRRTTTT

Quantity:

RRRR

RoHS:

Compliant

Lot No.