Surface Mount NTC Thermistors
FEATURES
• NEGATIVE TEMPERATURE COEFFICIENT
• FAST RESPONSE TO TEMPERATURE VARIATIONS MAKE THEM
IDEALLY SUITED FOR TEMPERATURE SENSORS AND COMPENSATORS
• STANDARD EIA 0402, 0603 AND 0805 SIZES
• NICKEL BARRIER SOLDER PLATE TERMINATIONS
• TAPE AND REEL FOR AUTOMATIC MOUNTING
NTHC Series
SURFACE MOUNT
CHARACTERISTICS
S erie s
E IA S ize
R e sista n ce R a ng e (+ 2 5 C )*
R e sista n ce To le ran ce (+ 2 5 C )*
O p era tin g Tem p e ra tu re R a n ge
S to ra ge Te m pe ra tu re R a n g e
M a xim u m Pow e r R a tin g **
D issip atio n C o n sta n t
B eta Va lu e R a n ge (+ 2 5
o
C ~ + 50
o
C )
B eta Va lue To le ra n ce
o
o
NTHC04
0 40 2
1 00 0 O h m ~ 2 M e gO h m
(K ) ± 10 % S td ., (J) ± 5 % O pt.
-4 0 C ~ +1 2 5 C
-4 0
o
C ~ +1 2 5
o
C
2 40 m W
2 .4 m W / C
3 11 0 ~ 4 9 50
(H ) ± 3%
o
o
o
NTHC06
0 60 3
3 0 O hm ~ 1 50 KO hm
(K ) ± 10 % S td ., (J) ± 5 % O pt.
-4 0 C ~ +1 2 5 C
-4 0
o
C ~ +1 2 5
o
C
3 00 m W
3 .0 m W / C
2 15 0 ~ 4 1 00
o
o
o
NTHC08
0 80 5
4 0 O hm ~ 2 M eg O h m
(K ) ± 10 % S td ., (J) ± 5 % O p t.***
-4 0
o
C ~ +1 2 5
o
C
-4 0
o
C ~ +1 2 5
o
C
5 00 m W
5 .0 m W /
o
C
2 30 0 ~ 5 0 00
(J) ± 5% , (H ) ± 3 % (va lu e s > 1 00
Ω
) (J) ± 5 % , (H ) ± 3 % (valu es > 1 00
Ω
)***
* -See Standard Products Table.
**-Test Method per JIS-C2571.
***-Special (F)
±1%
Tolerance Available, Contact NIC For Details.
Terminations:
Solder Plate Over
Terminations:
Nickel Barrier
Ag Base + Ni Barrier + Solder
Plating
¦
¦
W
¦
¦
¦
¦
¦
T
¦¦
¦
¦
L
1
L
¦
¦
DIMENSIONS (mm)
Series
NTHC04
NTHC06
NTHC08
EIA Size
0402
0603
0805
L
1.0 ± 0.15
1.6 ± 0.15
2.0 ± 0.20
W
0.50 ± 0.10
0.80 ± 0.15
1.25 ± 0.20
T
max.
0.55
0.95
1.25
L
1 min.
0.2
0.3
0.4
NIC’s Application Bulletin #NTHC-002, Contains Resistance Over Temperature Information. Contact NIC Or download informa-
tion at www.niccomp.com.
PART NUMBERING SYSTEM
NTHC08
3H
J
103
K
TR
Packaging, TR: Tape Reel
Resistance Tolerance: K=±10%, J=±5%
Resistance Value Code (See 3 digit codes on Standard Products Table)
Beta Value Tolerance: J=±5%, H=±3%
Beta Value Code (See 2 digit codes on Standard Products Table)
Series: NTHC04, NTHC06, NTHC08
®
¦
NIC COMPONENTS CORPORATION
70 Maxess Rd., Melville, NY 11747
•
(631)396-7500 FAX (631)396-7575
Surface Mount NTC Thermistors
STANDARD PRODUCTS TABLE
Type:
NTHC04
S ize: 0402
R esista nce (+25
o
C )
Value (O H M )
C ode
30
40
40
50
50
56
68
82
100
120
150
180
220
330
470
680
820
1K
1.2K
1.5K
1.5K
1.8K
2.0K
2.0K
2.2K
3.0K
3.3K
4.7K
6.8K
10K
10K
15K
22K
30K
33K
47K
68K
80K
100 K
150 K
2M E G
300
400
400
500
500
560
680
820
101
121
151
181
221
331
471
681
821
102
122
152
152
182
202
202
222
302
332
472
682
103
103
153
223
303
333
473
683
803
104
154
205
Value
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
311 0
n/a
320 0
n/a
n/a
n/a
n/a
329 0
337 0
342 0
353 0
367 0
382 0
n/a
403 0
390 0
n/a
365 0
340 0
345 0
350 0
354 0
362 0
495 0
B eta**
C ode
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
3C
n/a
3E
n/a
n/a
n/a
n/a
3G
3H
3I
3L
3N
3T
n/a
4B
3V
n/a
3N
3I
3J
3K
3L
3M
4W
TC*
% /
o
C
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
n/a
-3.4 8
n/a
-3.5 8
n/a
n/a
n/a
n/a
-3.6 8
-3.7 7
-3.8 2
-3.9 4
-4.1 0
-4.2 7
n/a
-4.5 0
-4.3 6
n/a
-4.0 8
-3.8 0
-3.8 6
-3.9 1
-3.9 6
-4.0 5
-5.5 3
Value
215 0
220 0
275 0
225 0
275 0
n/a
235 0
270 0
270 0
275 0
280 0
290 0
290 0
300 0
310 0
315 0
325 0
325 0
340 0
340 0
390 0
390 0
390 0
410 0
350 0
410 0
365 0
375 0
390 0
410 0
n/a
385 0
350 0
n/a
345 0
350 0
360 0
n/a
370 0
375 0
n/a
Type:
NTHC06
S ize: 0603
B eta**
C ode
2D
2E
2S
2F
2S
n/a
2H
2R
2R
2S
2T
2V
2V
3A
3C
3D
3F
3F
3I
3I
3V
3V
3V
4C
3K
4C
3N
3S
3V
4C
n/a
3U
3K
n/a
3J
3K
3M
n/a
3R
3S
n/a
TC*
% /
o
C
-2.4 0
-2.4 6
-3.0 7
-2.5 1
-3.0 7
n/a
-2.6 3
-3.0 2
-3.0 2
-3.0 7
-3.1 3
-3.2 4
-3.2 4
-3.3 5
-3.4 6
-3.5 2
-3.6 3
-3.6 3
-3.8 0
-3.8 3
-4.3 6
-4.3 6
-4.3 6
-4.5 8
-3.9 1
-4.5 8
-4.0 8
-4.1 9
-4.3 6
-4.5 8
n/a
-4.3 0
-3.9 1
n/a
-3.8 6
-3.9 1
-4.0 2
n/a
-4.1 3
-4.1 9
n/a
Value
n/a
230 0
n/a
240 0
n/a
240 0
265 0
n/a
275 0
n/a
280 0
n/a
290 0
300 0
310 0
320 0
n/a
320 0
n/a
340 0
n/a
n/a
350 0
n/a
n/a
410 0
375 0
395 0
410 0
337 0
392 4
365 0
375 0
395 0
380 0
385 0
365 0
370 0
410 0
415 0
500 0
NTHC Series
Type:
NTHC08
S ize: 0805
B eta**
C ode
n/a
2G
n/a
2I
n/a
2I
2N
n/a
2S
n/a
2T
n/a
2V
3A
3C
3E
n/a
3E
n/a
3I
n/a
n/a
3K
n/a
n/a
4C
3S
3W
4C
3H
3V
3N
3S
3W
3T
3U
3N
3R
4C
4D
5A
TC*
% /
o
C
n/a
-2.5 7
n/a
SURFACE MOUNT
-2.6 8
n/a
-2.6 8
-2.9 6
n/a
-3.0 7
n/a
3.13
n/a
-3.2 4
-3.3 5
-3.4 6
-3.5 8
n/a
-3.5 8
n/a
-3.8 0
n/a
n/a
-3.9 1
n/a
n/a
-4.5 8
-4.1 9
-4.4 1
-4.5 8
-3.7 7
-4.3 8
-4.0 8
-4.1 9
-4.4 1
-4.2 5
-4.3 0
-4.0 8
-4.1 3
-4.5 8
-4.6 4
-5.5 9
*-TC IS TEMPERATURE COEFFICIENT AT +25
O
C EXPRESSED IN PERCENT RESISTANCE VALUE CHANGE PER DEGREE CELSIUS.
**-BETA VALUE IS SPECIFIED (+/-3%) FOR +25
O
C ~ +50
O
C TEMPERATURE RANGE.
See our web site for Resistance verses Temperature Curves
®
NIC COMPONENTS CORPORATION
70 Maxess Rd., Melville, NY 11747
•
(631)396-7500 FAX (631)396-7575
Surface Mount NTC Thermistors
TAPE PACKAGING (Paper Tape)
Tape Dimensions
Chip Type Taping
Paper or tape of equal or higher grade with
perforated rectangular hole
NTHC Series
¦
t
1
¦
∅
Do
Sprocket Hole
¦
¦
¦
SURFACE MOUNT
F
¦
¦
NTHC0805 (0805)
¦ ¦
B
Component has been attached
¦
t
2
¦
¦
Series
A
¦
¦ ¦¦ ¦ ¦
¦
A
1.1 ± 0.2
1.65 ± 0.2
B
1.9 ± 0.2
2.4 ± 0.2
0.62 ± 0.1 1.15 ± 0.1
P
1
P
2
P
0
Forward Direction
¦
EIA Size
0402
0603
0805
NTHC04
NTHC06
NTHC08
TAPE DIMENSIONS (mm)
W
F
E
P
1
4.0 ± 0.1
P
2
2.0 ± 0.05
P
0
D
0
t
1
1.1 Min.
t
2
1.1 Min.
4.0 ± 0.1
∅1.5
± 0.1
8.0 ± 0.03 3.5 ± 0.05 1.75 ± 0.1
REEL
PACKAGE QUANTITY
Series
Size
0402
0603
0805
Quantity Per Reel
10,000
4,000
4,000
NTHC04
¦ ¦
E
¦
¦
¦
¦
¦
¦
¦
r
A
NTHC06
NTHC08
C
¦
¦
¦
¦
¦
¦
D
REEL DIMENSIONS (mm)
A
B
∅50
Min.
C
D
E
W
t
r
1.0
∅178
± 2.0
∅13.0 ∅21.0
2.0 11.0 ± 0.8
1.5
± 0.2
± 0.5 ± 0.8 ± 0.5
¦
¦
¦
W
¦
t
LAND PATTERN DIMENSIONS
Solder Resist
Land
Electrode
¦
b
¦
¦
®
¦
c
a
¦
d
¦
NIC COMPONENTS CORPORATION
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Chip
¦
B
¦
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LAND PATTERN DIMENSIONS (mm)
NTHC04 (0402)
Dim
a
b
c
d
NTHC06 (0603)
Reflow Soldering Flow Soldering Reflow Soldering Flow Soldering Reflow Soldering
1.5 ~ 1.7
0.2 ~ 0.3
0.5 ~ 0.6
0.5 ~ 0.6
2.6 ~ 3.2
0.4 ~ 0.9
0.8 ~ 1.0
0.7 ~ 0.8
2.6 ~ 3.2
0.4 ~ 0.9
0.8 ~ 1.0
0.7 ~ 0.8
3.0 ~ 4.0
0.6 ~ 1.2
0.8 ~ 1.4
0.9 ~ 1.2
3.0 ~ 4.5
0.6 ~ 1.6
0.8 ~ 1.4
0.9 ~ 1.5
¦
70 Maxess Rd., Melville, NY 11747
•
(631)396-7500 FAX (631)396-7575
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E
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4321
4321
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APPLICATION NOTE
NTHC SERIES
Surface Mount NTC Chip Thermistors
Application Note No. NTHC-002
Thermistor Basics
NTC thermistors are resistors with a high negative
temperature coefficient. They are produced from
high purity combinations of metallic oxides. Small
sizes, tight resistance tolerances, and fast response
to temperature variations make thermistors ideal
for precise temperature sensing and compensation.
The resistance of a thermistor as a function of
temperature is approximated by:
R(T) = Ro•e^[B(1/T-1/To)]
Where . . .
B is a material constant (B value)
T is the temperature in degrees Kelvin (
o
K)
Ro is the resistance of the thermistor at To
Usually To is taken at room temperature
(25
o
C = 298
o
K), and values of Ro range from less
than 50 ohms to several megohms.
The B Value is not a fixed constant and will vary as
a function of the material composition. Over wide
temperature ranges the resistance can best be
expressed using the Steinhart and Hart equation
and several resistance-temperature points from the
Resistance vs. Temperature Tables
(see
following 11 pages attached).
Dissipation Constant (D.C.)
The dissipation constant is the amount of power
needed to raise the temperature of the thermistor (due
to self-heating) by 1
o
C when mounted on standard
glass-epoxy boards (1.2mm thick). This intrinsic
heating process can be expressed by the following
equation:
Dissipation Constant (mW/
o
C) = P/(T1-T2)
Where . . .
P is the consumed power (I•R = I•V)
T1 is the thermistor temperature
T2 is the ambient temperature
Power Rating
The power rating is the maximum continuous power
the thermistor can withstand based on maximum
permissible temperature rise. Self-heating will limit
the power rating to the following equation.
Power Rating* = (Max Operating Temp. - 25
o
C)•(D.C.)
* Per JIS-C2571
Thermal Time Constant
The time it takes for the temperature of the thermistor
to change 63.2% of the difference between its initial
and final temperatures. The thermal time constant is
dependent upon the heat dissipation characteristics of
its mounting environment. For chip thermistors used
under typical conditions, the time constant will be 2
to 10 seconds.
Resistance Temperature Coefficient
The resistance temperature coefficient (T.C.) of a
thermistor is the rate of change of the resistance per
1
o
C temperature change. It is expressed in percent
change per
o
C and is given by:
T.C.(%/
o
C) = -(B/T
2
)•100
Typical values of T.C. range from -2% ~ -5%/ C.
This large change is what makes thermistors so
useful as sensitive temperature sensors.
o
Resistance vs. Temperature Tables
NIC Series
NTHC04
NTHC06
NTCH08
Case Size
0402
0603
0805
Pages
2~4
5~8
9 ~ 12
8/15/97
NIC Components Corp. · 70 Maxess Road, Melville, New York 11747 · (631) 396-7500 · FAX (631) 396-7575
RESISTANCE (OHM) VS. TEMPERATURE
NTHC-04
Size: 0402
TEMP
(C)
-30
-25
-20
-15
-10
-5
-0
+5
+10
+15
+20
1 Kohm
(102)
9.872K
7.716K
6.089K
4.851K
3.892K
3.143K
2.557K
2.094K
1.726K
1.431K
1.193K
1.5 Kohm
(152)
16.01K
12.41K
9.707K
7.667K
6.104K
4.895K
3.956K
3.220K
2.636K
2.172K
1.800K
2.2 Kohm
(222)
24.58K
19.12K
14.96K
11.76K
9.310K
7.426K
5.964K
4.823K
3.926K
3.217K
2.653K
3 Kohm
(302)
37.10K
28.32K
21.83K
16.99K
13.32K
10.53K
8.392K
6.736K
5.447K
4.436K
3.636K
3.3 Kohm
(332)
42.04K
31.96K
24.54K
19.00K
14.85K
11.72K
9.317K
7.467K
6.027K
4.898K
4.008K
4.7 Kohm
(472)
65.82K
49.63K
37.76K
28.97K
22.44K
17.53K
13.81K
10.98K
8.785K
7.081K
5.749K
+25
1.000K
1.500K
2.200K
3.000K
3.300K
4.700K
+30
+35
+40
+45
+50
+55
+60
+65
+70
+75
+80
+85
+90
+95
+100
842
713
607
519
446
384
333
290
253
222
195
172
153
136
121
1.257K
1.060K
897
764
653
561
4847
4200
365
319
279
246
217
192
171
1.835K
1.539K
1.298K
1.100K
936
801
689
595
516
449
392
344
303
268
238
2.490K
2.080K
1.746K
1.474K
1.251K
1.067K
914
787
680
590
514
450
395
348
308
2.733K
2.277K
1.907K
1.606K
1.359K
1.155K
986
847
730
633
551
481
422
372
329
3.867K
3.201K
2.666K
2.233K
1.881K
1.592K
1.355K
1.159K
995
858
743
647
565
496
436
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