NTC THERMISTORS:
TYPE BB05/07/11
BARE BEAD THERMISTOR
DESCRIPTION:
Miniature, uncoated bead thermistors on fine diameter
platinum alloy lead-wires.
FEATURES:
•
Extremely small sizes
•
Fastest thermal response times
•
Suitable for RF and Microwave power
measurements
•
Lower cost than glass sealed bead type thermistors
•
Normal operating/storage temperature range is
-80°C to +105°C
•
When protected from environmental exposures by
mounting into special housings or enclosures, they
are suitable for general temperature measurement
or control applications
•
Intermittent operation to 150°C is permissible,
however, stability will be degraded.
DIMENSIONS:
OPTIONS:
•
Non-standard resistance tolerances
•
Non-standard resistance values
•
Reference temperature(s) other than 25°C - specify
•
Mounting in special housings or enclosures
•
Longer continuous leads
•
Solderable or weldable/solderable leads
•
Calibration - specify temperature(s)
CODING:
The code number to be ordered may be specified as follows:
BB 05
P
A
243
N
Tolerance code letter (see NOTE 1 and TABLE B)
Zero-power resistance as 25°C (see NOTE 2)
Material System Code Letter (see TABLE A)
Lead configuration code letter.
“J” = adjacent leads
“P” = opposite leads
Nominal Bead Diameter in mils (specify 05, 07, or 11)
Style “BB” denotes BARE BEAD structure
NOTE 1:
Special tolerances are available on request. Consult factory for special resistance tolerances, non-standard
resistances and/or non-standard temperatures.
NOTE 2:
The zero-power resistance at 25°C, expressed in Ohms, is identified by a three digit code number. The first two digits
represent significant figures, and the last digit specifies the number of zeros to follow. Example: 24k Ohms= “243”.
The standard resistance values are from the 24-Value series decade as specified in Military Standard MS90178.
1.0 / 1.1 / 1.2 / 1.3 / 1.5 / 1.6 / 1.8 / 2.0 / 2.2 / 2.4 / 2.7 / 3.0
3.3 / 3.6 / 3.9 / 4.3 / 4.7 / 5.1 / 5.6 / 6.2 / 6.8 / 7.5 / 8.2 / 9.1
BOWTHORPE THERMOMETRICS
Crown Industrial Estate, Priorswood Road
Taunton, Somerset TA2 8QY UK
Tel +44 (0) 1823 335200
Fax +44 (0) 1823 332637
THERMOMETRICS, INC.
808 US Highway 1
Edison, New Jersey 08817-4695 USA
Tel +1 (732) 287 2870
Fax +1 (732) 287 8847
KEYSTONE THERMOMETRICS CORPORATION
967 Windfall Road
St. Marys, Pennsylvania 15857-3397 USA
Tel +1 (814) 834 9140
Fax +1 (814) 781 7969
TABLE A: THERMAL AND ELECTRICAL PROPERTIES:
The following table lists the THERMAL and ELECTRICAL properties for all BARE BEAD style THERMISTORS. All definitions and test
methods are per MIL-PRF-23648.
THERMISTOR TYPE:
BODY DIMENSIONS:
Nom. Diameter:
Max. Diameter:
Max. Length:
lead-wires:
Nom. Diameter:
Minimum Lead Length:
Lead Material:
Available Cuts:
BB05
BB07
BB11
.005"
.006"
.010"
(.13 mm)
(.15 mm)
(.25 mm)
.007"
.008"
.014"
(.18 mm)
(.20 mm)
(.36 mm)
.011"
.012"
.022"
(.28 mm)
(.30 mm)
(.56 mm)
.0007" (.02 mm)
.312" (7.9 mm)
Platinum Alloy
“J”
“P”
adj. (stubs)
opposite
.0011" (.03 mm)
.312" (7.9 mm)
Platinum Alloy
“J”
“P”
adj. (stubs)
opposite
.0011" (.03 mm)
.312" (7.9 mm)
Platinum Alloy
“J”
“P”
adj. (stubs)
opposite
MATERIAL SYSTEM:
CODE
R-vs-T
LETTER
CURVE
E
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
D
D
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
25/125
RATIO
5.0
11.8
12.5
14.0
16.9
19.8
22.1
22.7
29.4
30.8
32.3
35.7
38.1
45.0
48.1
56.5
75.6
81.0
Nominal
Resistance
Range @ 25°C
—
1.0 kΩ –
1.5 kΩ –
3.6 kΩ –
7.5 kΩ –
15 kΩ –
—
51 kΩ –
150 kΩ –
270 kΩ –
470 kΩ –
750 kΩ –
1.6 MΩ –
2.7 MΩ –
6.8 MΩ –
—
—
—
1.5 kΩ
3.6 kΩ
7.5 kΩ
15 kΩ
51 kΩ
150 kΩ
270 kΩ
470 kΩ
750 kΩ
1.6 MΩ
2.7 MΩ
6.8 MΩ
10 MΩ
Nominal
Resistance
Range @ 25°C
—
300
Ω
– 680
Ω
680
Ω
– 1.6k
Ω
1.6 kΩ – 3.6 kΩ
3.6 kΩ – 6.8 kΩ
6.8 kΩ – 27 kΩ
—
27 kΩ – 75 kΩ
75 kΩ – 130 kΩ
130 kΩ – 240 kΩ
240 kΩ – 360 kΩ
360 kΩ – 820 kΩ
820 kΩ – 1.3 MΩ
1.3 MΩ – 3.3 MΩ
3.3 MΩ – 6.8 MΩ
6.8 MΩ – 10 MΩ
—
—
Nominal
Resistance
Range @ 25°C
—
300
Ω
– 680
Ω
680
Ω
– 1.6k
Ω
1.6 kΩ – 3.6 kΩ
3.6 kΩ – 6.8 kΩ
6.8 kΩ – 27 kΩ
—
27 kΩ – 75 kΩ
75 kΩ – 130 kΩ
130 kΩ – 240 kΩ
240 kΩ – 360 kΩ
360 kΩ – 820 kΩ
820 kΩ – 1.3 MΩ
1.3 MΩ – 3.3 MΩ
3.3 MΩ – 6.8 MΩ
6.8 MΩ – 10 MΩ
—
—
THERMAL TIME CONSTANT:
Still Air at 25°C:
Plunge into Water:
DISSIPATION CONSTANT:
Still Air at 25°C:
Still Water at 25°C:
POWER RATING: (in air)
Maximum Power Rating:
100% Max. Power to:
Derated to 0% at:
.004 Watts
25°C
105°C
.006 Watts
25°C
105°C
.008 Watts
25°C
105°C
.05 mW/°C
.25 mW/°C
.07 mW/°C
.35 mW/°C
.095 mW/°C
.47 mW/°C
0.11 sec
4.5 msec
0.2 sec
6 msec
0.65 sec
11 msec
RESISTANCE -VS- TEMPERATURE CHARACTERISTICS: The nominal resistance range for the zero-power resistance at 25°C is shown
for each THERMISTOR Type and each available Material System. Each Material System is denoted by an ordering Code Letter,
a referenced Curve number and the nominal 25°C/125°C resistance ratio.
TABLE B: STANDARD TOLERANCES:
Tolerance Code Letter
± % Tolerance at 25°C
J
5
K
10
L
15
M
20
N
25
P
30
Q
40
R
50
S
Non-standard – consult factory
KEYSTONE THERMOMETRICS CORPORATION
967 Windfall Road
St. Marys, Pennsylvania 15857-3397 USA
Tel +1 (814) 834 9140
Fax +1 (814) 781 7969
BOWTHORPE THERMOMETRICS
Crown Industrial Estate, Priorswood Road
Taunton, Somerset TA2 8QY UK
Tel +44 (0) 1823 335200
Fax +44 (0) 1823 332637
THERMOMETRICS, INC.
808 US Highway 1
Edison, New Jersey 08817-4695 USA
Tel +1 (732) 287 2870
Fax +1 (732) 287 8847
