EU
THERMAL SENSORS RoHS
LT73 Linear Positive Temp. Coefficient Flat Chip Resistors
Construction
Coating colorOrange
Dimensions
Features
Dimensionsmm
Type Weightg
0.2
Inch Size Code 1000pcs
L0.2 W0.2 c d . t0.1
0.1
6 2A
T.C.R.150450010 /K 2.0 1.25 0.40.2 0.3 0.5 4.54
0805
2B
3.2 1.6 0.50.3 0.4 0.6 9.14
1206
RoHS
SMD thin film resistors with thermo-perceptivity.
6
Type Designation
Various TCRs 150450010 /K are available.
Examples
Suitable for both flow and reflow soldering.
LT73 2B T TD 202 J 0150
Products with lead free termination meet EU-RoHS
requirements.
Product Power Terminal Taping Nominal Resistance T.C.R.
6
10 /K
Code Rating Surface Material Resistance Tolerance
Application
2A: 0.1W T:Sn TD:4mm pitch 3 digits G :2% 4 digits
2B: 0.125W L:Sn/Pb paper J :5%
TE:4mm pitch
Suitable for temperature control in various industrial plastic
embossed
equipment.
BK:Bulk
Reference Standards
EU-RoHS
APPENDIX C
IEC 60115-8
The terminal surface material lead free is standard.
JIS C 5201-8 Contact us when you have control request for environmental hazardous material other than the substance specified by EU-RoHS.
For further information on taping, please refer to APPENDIX C on the back pages.
Ratings
1 1
/
Taping & Q'ty/Reel pcs
Power Max.Working Max.Overload Thermal Time Thermal Dissipation Rated Ambient Operating Temperature
Type
Rating Voltage Voltage Constant Constant Temperature Range
TD TE
2A 0 .1W 5 0V 10 0V 1. 0 s 1. 3 7mW/ 5 ,000 4,000
70 4 0125
2B 0 .125 W 75 V 15 0V 1. 5 s 1. 47mW/ 5 ,000 4,000
1
1 Thermal time constant and dissipation constant are reference values, which are values of elements and vary with connecting or fixing methods.
T.C.R. and Resistance Range
Resistance RangeE24
Resistance
6
T.C . R .10 /K T.C.R.Tolerance
Tolerance
2A 2B
6
150250350450500 10 010 /K 2 k24 k 2k51k G : 2 %
6
600700800900 15 010 /K 1k2 0 k 1k4 3 k
100012001400 1k13 k 1k27k
15%
16001800 510 4 .7k 1k10 k
200022002400 510 4 .7k 510 9.1k
J :5 %
260028003000
510 3 k 510 6 . 2k
330036003900 10 %
4200 10 0 1k 10 0 2k
4500 51510 51510
T.C.R.2575T.C.R. Measuring Temperature:2575
Rated voltage Power RatingResistance value or Max. working voltage, whichever is lower.
Oct. 2015
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage. www.koaglobal.com
Thermal Sensors
Thermal Sensors
Derating Curve Examples of Temperature Characteristics of Resistance
70
For resistors operated at an ambient temperature of 70 or above, a power
rating shall be derated in accordance with the above derating curve.
T.C.R.
6 C C C
0 1 2
10 /K
Approximate Expression for Resistance-Temperature Characteristics 6
3000 0.9288 0.0028 1.998310
6
Values are not guaranteed but typical.
3300 0.9232 0.0030 2.998010
6
2
3600 0.9175 0.0032 4.000010
RT=R25C0+C1T+C2T RTT RTResistance value at T
6
3900 0.9099 0.0035 4.006410
R2525 R25Resistance value at 25
6
4200 0.9026 0.0038 3.996410
T TAmbient temperature 6
4500 0.8948 0.0041 4.006410
C0, C1, C2 C0, C1, C2Constants
Performance
Performance Requirements
R%0.05
Test Items Test Methods
Limit Typical
25
Resistance Within specified tolerance
25/75
T.C.R. Within specified T.C.R.
2.55
1 0.23
OverloadShort time Rated voltage2.5 or Max. overload vol. for 5s, whichever is lower.
1 0.10 2605, 10s1s
Resistance to soldering heat
1 0.10 4030min./12530min. 5 cycles
Rapid change of temperature
402, 90%95%RH, 1000h
3 0.54
Moisture resistance 1.5 ON/0.5 OFF 1.5h ON/0.5h OFF cycle
70 702, 1000h
3 0.62
Endurance at 70 1.5 ON/0.5 OFF 1.5h ON/0.5h OFF cycle
70
Confirming resistance drift is recommended since this product has a tendency to have bigger resistance change than general flat chip over 70.
Please pay attention not to be applied ESD, it may cause of resistance change.
Actual Value (Out of guarantee)
Test Items Reference Test Methods
0.05% 40, 45min
Low temperature exposure
0.6% 125, 1000h
High temperature exposure
500V , Human body model, 100pF, 1.5k
ESD
Precautions for Use
Na Cl
RMA
LT73
5353575
RH12
The resistance value of this resistor changes by its self-heating by power applied. Therefore, it is recommended to use it by taking its self heat-generation into consideration.
Ionic impurities such as flux etc. that are attached to these products or those mounted onto a PCB, negatively affect their moisture resistance, corrosion resistance, etc. The flux may contain ionic
substances like chlorine, acid, etc. while perspiration and saliva include ionic impurities like sodium (Na ), chlorine (Cl ) etc. Therefore these kinds of ionic substances may induce electrical corrosion when
they invade into the products. Either thorough washing or using RMA solder and flux are necessary since lead free solder contains ionic substances. Washing process is needed, before putting on moisture
proof material in order to prevent electrical corrosion.
An overcurrent such as surge, etc.may break the metal film of LT73.
Please pay attention that the top of an iron does not direct touch to the components. There is a risk that may cause a change in resistance. Take care that another risk may happen that the protecting
coat is carbonized in an instant when touched directly by the top of the iron, also climatic-proof for electric corrosion or insulation of protecting coat may be dropped down. Be sure not to give high
temperature on the top of the iron as it will degrade the protecting coat.
Avoid storing components under direct sun rays, high temperature/humidity. Direct sun rays will cause quality change of taping and difficulty of keeping appropriate peeling strength. 535/35
75%RH, there is no deterioration of solderability for 12 months, but take special care for storing, because condensation, dust, and toxic gas like hydrogen sulfide, sulfurous acid gas, hydrogen chloride,
etc. may drop solderability.
The upper electrodes could be peeled off when a heat-resistant masking tape is attached to the mounted chip resistors and then detached from them. It is confirmed that the adhesiveness gets stronger
due to the exposure to heat under mounting. Accordingly, we recommend the use of masking tape be refrained. If the use of heat-resistant masking tape is unavoidable, please make sure that the adhesives
on the tape do not directly come in contact with the product.
Oct. 2015
Specifications given herein may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use.
Contact our sales representatives before you use our products for applications including automotives, medical equipment and aerospace equipment.
Malfunction or failure of the products in such applications may cause loss of human life or serious damage. www.koaglobal.com