TECHNICAL DATA
1
TEMPERATURE AND RELATIVE HUMIDITY SENSOR
HTS2010SMD
Based on a unique capacitive cell for humidity measurement and a Negative Temperature
Coefficient (NTC) thermistor for temperature measurement, this dual purpose relative humidity / tempe-
rature miniaturized sensor is designed for high volume, cost sensitive applications with tight space
constraints. It is useful in all applications where dew point, absolute humidity measurements or humi-
dity compensation are required.
MAIN FEATURES
HUMIDITY SENSOR SPECIFIC FEATURES
●Miniature Surface mount SMD package
●Compatible with automated assembly processes, including wave soldering,
water immersion and reflow soldering
●Full interchangeability with no calibration required in standard conditions
●High reliability and long term stability
●Instantaneous desaturation after long periods in saturation phase
●Patented solid polymer structure
●Suitable for linear voltage or frequency output circuitry
●Fast response time
TEMPERATURE SENSOR SPECIFIC FEATURES
MAXIMUM RATINGS
CHARACTERISTICS
●High quality thermistor
●Stable
●High sensitivity
RH
T
Ratings Symbol Value Unit
Storage Temperature Tstg - 40 to 100 °C
Supply Voltage on humidity cell Vs 10 Vac
Humidity Operating Range RH 0 to 100 % RH
Temperature Operating Range Ta - 40 to 100 °C
Maximum Electric Power
t
o be supplied (continuous) @ 25°C
P25 2 mW
Characteristics Symbol Min. Typ. Max. Unit.
Humidity measuring range RH 1 99 %
Nominal capacitance @ 55 % RH* C 177 180 183 pF
Averaged Sensitivity from 33 % to 75 % RH ∆C/%RH 0.34 pF/%RH
Long term stability 0.5 %RH/yr
Recovery time after 150 hours of condensation 10 s
Response time (33 to 76 % RH, static, @ 63 %) τ10 s
(Ta = 25°C, Vs= 5 volts, measurement frequency @ 10 kHz unless otherwise noted)
Humirel Sensor Device Data / HPC008 Rev D April 2001
Humidity sensor
HTS2010SMD
(Ta = 25°C unless otherwise noted)
CHARACTERISTICS (CONT)
Characteristics Symbol Min. Typ. Max. Unit.
Temperature coefficient at 55 % RH / 10 to 40°C Tcc + 0.04 pF/°C
Humidity Hysteresis +/-1.5 % RH
Deviation to typical curve (see below) (10 % to 90 % RH) +/-2 % RH
Supply voltage Vs 1 5 10 Vac
Leakage current (Vs = 5 volts) 1nA
Characteristics Symbol Min. Typ. Max. Unit.
Nominal resistance @ 25°C 10 kΩ
Beta value : B25/100 B 3600 3730 3800
Temperature measuring range Ta - 40 100 °C
Nominal Resistance Tolerance* Rn 2 3 %
B value tolerance B3%
Response Time τ10 s
Humidity sensor
Temperature sensor
Typical response curve of HTS2010SMD in humidity
Typical temperature output
TECHNICAL DATA
2
Humirel Sensor Device Data / HPC008 Rev D April 2001
205
200
195
190
185
180
175
170
165
160
0 102030405060708090100
Relative Humidity (% RH)
capacitance (in pF)
Calibration data are traceable to NIST
standards through CETIAT laboratory.
Measurement frequency : 10 kHz
Ta = 25°C
Depending on the needed temperature measurement range and the
associated accuracy, we suggest two methods to access to the NTC
resistance values.
NTC resistance in Ωat temperature Tin K
C in pF, RH in %
Polynomial response :
NTC resistance in Ωat rated temperature in K
Temperature in K
Bvalue, material-specific constant of the NTC thermistor
Base of natural logarithm (e = 2,71828)
°C ohm ohm°C
R NTC standardized R NTC exponential
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
The actual characteristic of an NTC thermistor can, however, only be
roughly described by the exponential relation, as the material parame-
ter Bin reality also depends on temperature. So this approach is only
suitable for describing a restricted range around the rated temperature
or resistance with sufficient accuracy.
For practical applications a more precise description of the real R/T
curve may be required. Either more complicated approaches (e.g the
Steinhart-Hart equation) are used or the resistance/temperature rela-
tion as given in tabulated from. These standardized curves have been
experimentally determined with utmost accuracy ; they are aslo availa-
ble for temperature increments of 1 degree.
262960
194110
144790
109030
82923
63591
49204
38279
30029
23773
18959
15207
12280
10000
8178
6734
5575
4636
3874
3237
2720
2304
1960
1674
1432
1235
1067
927
809
°C ohm ohm°C
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
52000
40500
31000
24500
19300
15400
12350
10000
8140
6670
5500
4550
3800
3180
2690
2270
1940
1650
1430
1230
1070
925
810
x
1
2
*Tighter tolerance available on request
*Tighter tolerance available on request
(Ta = 25°C, measurement frequency @ 10 kHz unless otherwise noted)
TECHNICAL DATA
3
SUGGESTED EVALUATION CIRCUIT FOR HUMIDITY FREQUENCY
AND TEMPERATURE ANALOG OUTPUTS
Relative humidity (Frequency output)
Soldering instructions
This circuit is a typical Astable design for 555. The HTS2010 is used as a variable capacitor and provides an output fre-
quency modulation with relative humidity ranging from 0% to 100%.
In this frequency output circuit configuration (for capacitance measurement), R1 unbalances the internal temperature com-
pensation scheme of the 555. It shifts the negative initial temperature coefficient of the 555 to a positive one that matches
the humidity sensing chip’s temperature coefficient of - 1.4Hz/°C. In all cases, R1 should be a 1 % resistor with a maximum
of 100ppm temperature coefficient like all other R-C timer resistors.
Resistors values
Since 555 internal temperature compensation changes from manufacturer to manufacturer, R1 and R2 values should be
adapted to device to be used.
Temperature (voltage output)
The temperature measurement is done by a voltage divider, RV2 must be adjusted to get 2.5 V at 25°C as temperature
measurement.
See application note HPC 034 VO
555 R1 R2
TLC555 (Texas) 909kΩ576kΩ
TS555 (STM) 100nF capacitor 523kΩ
7555 (Harris) 1732kΩ549kΩ
LMC555 (National) 1238kΩ562k
For a frequency of 6660Hz at 55%RH
Humirel Sensor Device Data / HPC008 Rev D April 2001
Polarization
In order to get better reproducibility during measurement, always connect pin 4 (see the package outline on page 4) to the
ground of the circuit.
TECHNICAL DATA
4
QUALIFICATION PROCESS
PACKAGE OUTLINE HTS2010SMD
RECOMMENDED FOOTPRINT
HTS2010SMD sensors have been qualified through a complete qualification process taking in account many of the requi-
rements of the MIL STD750 including :
Solder heat and solderability
Wave soldering at 260°C + DI water clean at 45°C
Mechanical shock - 1500 g, 5 blows, 3 directions
Vibration - Variable (F = 100 - 2000Hz), fixed (F = 35Hz)
Constant acceleration
Marking permanency
ESD - Electrostatic Discharge - Human body & Machine
model
Salt Atmosphere MIL STD750/Method 1041/96 hours
Temperature Cycling – -40°C / +70°C
High Temperature / Humidity Operating Life - 93% RH /
60°C for 1000 hours
Low humidity storage life - RH < 10%/23°C - 1000 hours
Resistance to immersion in water at ambient temperature
and 80°C - 160 hours
Resistance to acid vapors at 75000 ppm for nitric, sulfuric
and chlorhydric acids
Resistance to many chemicals linked with home applian-
ces/ automative or consumer applications.
Dimension AB C D E F GHL
mm (typical) 6 10 2.7 0.8 2.54 12.8 0-7° 0.2 0.1
The information in this sheet has been carefully reviewed and is believed to be accurate ; however, no responsability is assumed for inaccuracies. Furthermore, this information does not convey to the
purchaser of semiconductor devices any license under the patent rights to the manufacturer. Humirel reserves the right to make changes without further notice to any product herein. Humirel makes no
warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does Humirel assume any liability arising out of the application or use of any product or circuit
and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters can and do vary in different applications. Customer’s technical experts
must validate all operating parameters, including “Typical” for each customer application. Humirel does not convey any license under its patent rights nor the rights of others. Humirel products are not desi-
gned, intended, or authorized for use as components in systems intended for surgical implant into the body, or other application intended to support or sustain life, or for any application in which the fai-
lure of the Humirel product could create a situation where personal injury or death may occur. Should buyer purchase or use Humirel products for any such unintended or unauthorized application, Buyer
shall indemnify and hold Humirel and its officers, employees, subsidiaries, affiliates and distributors harmless against all claims, costs, damages and expenses, and reasonable attomey fees arising out
of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Humirel was negligent regarding the design or manu-
facture of the part. Humirel is a registered trademark of Humirel.
Humirel Sensor Device Data / HPC008 Rev D April 2001
ORDERING INFORMATION (MULTIPLE PACKAGE QUANTITY OF 80 PIECES).
HTS 2010 SMD : HUMIDITY ANALOG VOLTAGE OUTPUT MODULE
email : sales@humirel.com
SAMPLE KIT OF HTS 2010
IS AVAILABLE THROUGH
HUMIREL WEB SITE
www.humirel.com
GULL WING (JLEAD option also available).
All dimensions in mm
Scale 1:1
