NTC SMD Thermistors
With Nickel Barrier Termination NB 12 - NB 20
Chip thermistors are high quality and low cost devices
especially developed for surface mounting applications. They
are widely used for temperature compensation but can also
achieve temperature control of printed circuits.
A nickel barrier metallization provides outstanding qualities of
solderability and enables this chip to meet the requirements
of the most severe soldering processes.
Types
NB 12
IEC SIZE : 0805
2 (.079)
±
0.3 (.012)
NB 20
IEC SIZE : 1206
3.2 (.126)
±
0.4 (.016)
1.6 (.063)
±
0.25 (.010)
0.5 (.020)
... 1.5 (.059)
DIMENSIONS:
millimeters (inches)
1.25 (.049)
±
0.2 (.008)
0.5 (.020)
... 1.3 (.051)
0.2 (.008) min
0.2 (.008) min
0.2 (.008) min
0.2 (.008) min
Terminations
Marking
Climatic category
Operating temperature
Tolerance on Rn (25°C)
Maximum dissipation at 25°C
Thermal dissipation factor
Thermal time constant
Resistance - Temperature characteristics: pages 36 to 40.
Nickel Barrier
On packaging only
40/125/56
-55°C to +150°C
±5%, ±10%, ±20%
0.12 W
2 mW/°C
5s
0.24 W
4 mW/°C
7s
APPLICATIONS
•
•
•
•
•
•
•
•
•
LCD compensation
Battery packs
Mobile phones
CD players
Heating systems
Air-conditioning systems
Temperature control of Switch Mode Power Supplies
Compensation of pressure sensors
Protection of power transistors in various electronic circuits
HOW TO ORDER
NB 20
K0
0103
M
BA
Type
Material Code
K
(See tables page 13)
Resistance
10,000
Ω
Tolerance
M (±20%)
J (±5%)
K (±10%)
12
Suffix: Packaging
– –: Bulk
BA: Plastic tape
(180mm diam. reel)
BE: Plastic tape (1/2 reel)
BC: Plastic tape
(330mm diam. reel)
BB: Cardboard tape
(180mm diam. reel)
BF: Cardboard tape (1/2 reel)
BD: Cardboard tape
(330mm diam. reel)
NTC SMD Thermistors
With Nickel Barrier Termination NB 12 – NB 20
TABLE OF VALUES
NB 12
IEC SIZE : 0805
Types
Rn at 25°C
(Ω)
Material
Code
B (K)
NB 20
IEC SIZE : 1206
(
B/B
(1) ± 5%
(2) ± 3%
)
at 25°C
(%/°C)
Types
Rn at 25°C
(Ω)
Material
Code
B (K)
(
B/B
(1) ± 5%
(2) ± 3%
)
at 25°C
(%/°C)
NB 12 KC 0 180
NB 12 KC 0 220
NB 12 KC 0 270
NB 12 KC 0 330
NB 12 KC 0 390
NB 12 KC 0 470
NB 12 KC 0 560
NB 12 KC 0 680
NB 12 KC 0 820
NB 12 KC 0 101
NB 12 MC 0 121
NB 12 MC 0 151
NB 12 MC 0 181
NB 12 MC 0 221
NB 12 MC 0 271
NB 12 MC 0 331
NB 12 MC 0 391
NB 12 MC 0 471
NB 12 MC 0 561
NB 12 MC 0 681
NB 12 MC 0 821
NB 12 MC 0 102
NB 12 MC 0 122
NB 12 MC 0 152
NB 12 MC 0 182
NB 12 MC 0 222
NB 12 MC 0 272
NB 12 MC 0 332
NB 12 J 0 0332
NB 12 J 0 0392
NB 12 J 0 0472
NB 12 J 0 0562
NB 12 K 0 0682
NB 12 K 0 0822
NB 12 K 0 0103
NB 12 L 0 0123
NB 12 L 0 0153
NB 12 M 0 0183
NB 12 M 0 0223
NB 12 M 0 0273
NB 12 M 0 0333
NB 12 N 0 0393
NB 12 N 0 0473
NB 12 N 0 0563
NB 12 L 2 0683
NB 12 N 5 0683
NB 12 N 5 0823
NB 12 P 0 0104
NB 12 SC 0104
NB 12 P 0 0124
NB 12 P 0 0154
NB 12 P 0 0184
NB 12 Q 0 0224
NB 12 Q 0 0274
NB 12 R 0 0105
18
22
27
33
39
47
56
68
82
100
120
150
180
220
270
330
390
470
560
680
820
1,000
1,200
1,500
1,800
2,200
2,700
3,300
3,300
3,900
4,700
5,600
6,800
8,200
10,000
12,000
15,000
18,000
22,000
27,000
33,000
39,000
47,000
56,000
68,000
68,000
82,000
100,000
100,000
120,000
150,000
180,000
220,000
270,000
1,000,000
NB 20 MC 0 221
NB 20 MC 0 102
KC
3470 ± 5%
– 3.9
NB 20 J 0 0472
NB 20 J 0 0562
NB 20 J 0 0682
NB 20 J 5 0822
NB 20 K 0 0103
NB 20 K 0 0123
NB 20 L 0 0153
NB 20 L 0 0183
NB 20 L 0 0223
NB 20 M 0 0273
NB 20 M 0 0333
NB 20 M 0 0393
NB 20 M 0 0473
MC
3910 ± 3%
– 4.4
NB 20 N 0 0563
NB 20 N 0 0683
NB 20 N 0 0823
NB 20 N 5 0104
NB 20 P 0 0124
NB 20 P 0 0154
NB 20 P 0 0184
NB 20 P 0 0224
NB 20 Q 0 0274
NB 20 Q 0 0334
NB 20 Q 0 0394
NB 20 Q 0 0474
NB 20 Q 0 0564
NB 20 R 0 0684
NB 20 R 0 0824
NB 20 R 0 0105
220
1,000
4,700
5,600
6,800
8,200
10,000
12,000
15,000
18,000
22,000
27,000
33,000
39,000
47,000
56,000
68,000
82,000
100,000
120,000
150,000
180,000
220,000
270,000
330,000
390,000
470,000
560,000
680,000
820,000
1,000,000
MC
MC
J
J5
K
L
3910 ± 3%
3910 ± 3%
3480 ± 3%
3480 ± 3%
3630 ± 3%
3790 ± 3%
– 4.4
– 4.4
– 3.9
– 3.9
– 4.0
– 4.2
M
3950 ± 3%
– 4.4
N
N5
4080 ± 3%
4160 ± 3%
– 4.6
– 4.7
P
4220 ± 3%
– 4.7
Q
4300 ± 3%
– 4.7
J
3480 ± 3%
– 3.9
R
4400 ± 3%
– 4.8
K
L
M
3630 ± 3%
3790 ± 3%
3950 ± 3%
– 4.0
– 4.2
– 4.4
N
L2
N5
P
SC
P
Q
R
4080 ± 3%
3805 ± 3%
4160 ± 3%
4220 ± 3%
4500 ± 3%
4220 ± 3%
4300 ± 3%
4400 ± 3%
– 4.6
– 4.1
– 4.7
– 4.7
– 4.8
– 4.7
– 4.7
– 4.8
13
Packaging for Automatic Insertion
NTC Chip Thermistors / NC/NB Series
AUTOMATIC INSERTION
Super 8 Plastic Tape Packaging:
The mechanical and dimensional reel characteristics are in
accordance with the IEC publication 286-3.
5.5 (.217)
±0.2
(.008)
Cover Tape
Max
3°
B0
Max
3°
30µ
±
5µ
T
K
R = 0.3 (.012) Max.
B1
F
D0
P2
P0
Max
3°
Max
3°
A0
Direction of
unreeling
Hole
A1
W
1 (.039)
-0
+0.2 (.008)
E
Designation
Tape width
Tape thickness
Pitch of the sprocket holes
Diameter of the sprocket holes
Distance
Distance (center to center)
Distance (center to center)
Sizes of the
NC 12 (0805)
cavities
Symbol
W
T
P0
D0
E
F
P2
A0
B0
K
Value
8
0.4 max.
4
1.5
-0
1.75
3.5
2
1.5
2.4
1.4 max.
Tolerance
±0.2
±0.1
±0.1
±0.1
±0.05
±0.1
±0.1
±0.1
K ±0.1
(size is adjustable)
(K = t1 +0.2)
±0.1
±0.1
K ±0.1
(size is adjustable)
(K = t1 +0.2)
NC 20 (1206)
A0
B0
K
1.95
3.55
1.5 max.
ø180 (7.09)
- 2 (.079)
+0
Direction of unreeling
ø 12.75 (.502)
- 0
ø 62 (2.44)
±
1.5 (.059)
+ 0.15 (.006)
Reel
Upper side
8.4 (.331)
14.4 (.567)
max.
+0.15 (.006)
Reel
according to
ISO/DIS 3639-2
+ 0.5 (.020)
Bottom side
ø 20.5 (.087)
- 0
QUANTITY PER REEL
Type
NC - NB 12
NC 20 - NB 20
Suffix
BA
BE
BA
BE
Qty Per Reel
4000
2000
3000
1500
16
Packaging for Automatic Insertion
NTC Chip Thermistors / NC/NB Series
AUTOMATIC INSERTION
8mm Paper Tape Packaging:
The mechanical and dimensional reel characteristics
are in accordance with the IEC publication 286-3.
BOTTOM
COVER
TAPE
T
D
0
P
2
P
0
10 PITCHES CUMULATIVE
TOLERANCE ON TAPE
0.20mm (0.008)
E
1
TOP
COVER
TAPE
B
0
G
T
1
T
1
CAVITY SIZE
SEE NOTE 1
A
0
CENTER LINES
OF CAVITY
P
1
User Direction of Feed
F
E
2
W
Designation
Tape width
Tape thickness
Pitch of the sprocket holes
Diameter of the sprocket holes
Distance
Distance (center to center)
Distance (center to center)
Cover tape thickness
Distance
Distance
Component pitch
0805/0603
0402
Symbol
W
T
P
0
D
0
E
1
F
P
2
T
1
E
2
G
P
1
Value
8
1.1 max.
4
1.5
-0/+0.1
1.75
3.5
2
0.10 max.
6.25 min.
0.75 min.
4
2
Tolerance
-.0.1/+0.3
±0.1
±0.1
±0.1
±0.05
±0.05
±0.1
±0.1
ø180 (7.09)
- 2 (.079)
+0
Direction of unreeling
ø 12.75 (.502)
- 0
ø 62 (2.44)
±
1.5 (.059)
+ 0.15 (.006)
Reel
Upper side
8.4 (.331)
14.4 (.567)
max.
+0.15 (.006)
Reel
according to
ISO/DIS 3639-2
+ 0.5 (.020)
Bottom side
ø 20.5 (.087)
- 0
QUANTITY PER REEL
Type
NB - NC 12
NB 21
NB 23
Suffix
BB
BF
BB
BF
Qty Per Reel
4000
2000
10000
5000
17
Surface Mounting Guide
Chip Thermistor – Application Notes
STORAGE
Good solderability is maintained for at least twelve months,
provided the components are stored in their “as received”
packaging at less than 40°C and 70% RH.
Wave
300
Preheat
250
200
150
100
50
Natural
Cooling
SOLDERABILITY / LEACHING
Terminations to be well soldered after immersion in a 60/40
tin/lead solder bath at 235 ± 5°C for 2 ± 1 seconds.
Terminations will resist leaching for at least the immersion
times and conditions recommendations shown below.
P/N
NC
NB
Termination
Type
AgPdPt
Nickel Barrier
Solder
Tin/Lead
60/40
60/40
Solder
Temp ºC
260 ± 5
260 ± 5
Immersion
Time Seconds
15 max
30 ± 1
Solder Temp.
T
230ºC
to
250ºC
0
1 to 2 min
3 sec. max
(Preheat chips before soldering)
T/maximum 150°C
NB products are compatible with a wide range of soldering
conditions consistent with good manufacturing practice for
surface mount components. This includes Pb free reflow
processes with peak temperatures up to 270ºC.
Recommended profiles for reflow and wave soldering are
shown below for reference.
NC products are recommended for lead soldering application
or gluing techniques.
a) The visual standards used for evaluation of solder joints
will need to be modified as lead free joints are not as bright
as with tin-lead pastes and the fillet may not be as large.
b) Resin color may darken slightly due to the increase in
temperature required for the new pastes.
c) Lead-free solder pastes do not allow the same self align-
ment as lead containing systems. Standard mounting
pads are acceptable, but machine set up may need to be
modified.
D2
Reflow
300
250
200
150
100
50
220ºC
to
250ºC
Preheat
Natural
Cooling
RECOMMENDED
SOLDERING PAD
LAYOUT
D1
D3
Solder Temp.
Dimensions in
mm (inches)
D4
D5
REFLOW SOLDERING
Case
Size
0402
1min
1min
10 sec. max
(Minimize soldering time)
P/N
NB23
NB21
NB12
NB20
D1
1.70
(.067)
2.30
(.091)
3.00
(.118)
4.00
(.157)
D2
0.60
(.024)
0.80
(.031)
1.00
(.039)
1.00
(.039)
D3
0.50
(.020)
0.70
(.028)
1.00
(.039)
2.00
(.079)
D4
0.60
(.024)
0.80
(0.31)
1.00
(.039)
1.00
(.039)
D5
0.50
(.020)
0.75
(.030)
1.25
(.049)
2.50
(.098)
0
0603
0805
300
250
200
150
100
50
0
0
1206
Temperature °C
WAVE SOLDERING
Case
Size
50
100
150
200
250
Time (s)
300
0603
0805
1206
P/N
NB21
NB12
NB20
D1
3.10
(.122)
4.00
(.157)
5.00
(.197)
D2
1.20
(.047)
1.50
(.059)
1.50
(.059)
D3
0.70
(.028)
1.00
(.039)
2.00
(.079)
D4
1.20
(.047)
1.50
(.059)
1.50
(.059)
D5
0.75
(.030)
1.25
(.049)
1.60
(.063)
• Pre-heating: 150°C ±15°C / 60-90s
• Max. Peak Gradient: 2.5°C/s
• Peak Temperature: 245°C ±5°C
• Time at >230°C: 40s Max.
18
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