2

Type P20/25/30 Specifications

NTC Types

P20/25/30

dimensions

Body

Dimensions:

Thermistor Type:

P20

P25

P30

Minimum Diameter:

.020 in (.51 mm)

.025 in (.64 mm)

030 in (.76 mm)

Standard

code “AA”

.063 in (1.6 mm)

—

—

Body

“L”

code “A”

.125 in (3.2 mm)

.125 in (3.2 mm)

.125 in (3.2 mm)

Lengths

code “B”

.250 in (6.3 mm)**

.250 in (6.3 mm)

.250 in (6.3 mm)

Lead-wires:

Nom. Diameter:

.0011 in (.03 mm)

.002 in (.05 mm)

.003 in (.08 mm)

Minimum Lead Length:

.250 in (6.3 mm)

.250 in (6.3 mm)

.250 in (6.3 mm)

Lead Material:

Platinum Alloy

Platinum Alloy

Platinum Alloy

Material System:

Nominal

Nominal

Resistance

Resistance

Resistance

Code

Letter

R-vs-T

Curve

25/125

Ratio

Range @

77°F (25°C)

Range @

77°F (25°C)

Range @

77°F (25°C)

E

0

5.0

—

—

—

A

1

11.8

300 Ω to 680 Ω

300 Ω to 680 Ω

100 Ω to 300 Ω

A

2

12.5

680 Ω to 1.6 kΩ

680 Ω to 1.6 kΩ

300 Ω to 750 Ω

A

3

14.0

1.6 kΩ to 3.6 kΩ

1.6 kΩ to 3.6 kΩ

750 Ω to 1.5 kΩ

A

4

16.9

3.6 kΩ to 6.8 kΩ

3.6 kΩ to 6.8 kΩ

1.5 kΩ to 3.0 kΩ

A

5

19.8

6.8 kΩ to 27 kΩ

6.8 kΩ to 27 kΩ

.0 kΩ to 6.8 kΩ

A

6

22.1

–

–

6.8 kΩ to 13 kΩ

A

7

22.7

27 kΩ to 75 kΩ

27 kΩ to 75 kΩ

13 kΩ to 18 kΩ

B

8

29.4

75 kΩ to 130 kΩ

75 kΩ to 130 kΩ

18 kΩ to 51 kΩ

B

9

30.8

130 kΩ to 240 kΩ

130 kΩ to 240 kΩ

51 kΩ to 82 kΩ

B

10

32.3

240 kΩ to 360 kΩ

240 kΩ to 360 kΩ

82 kΩ to 150 kΩ

B

11

35.7

360 kΩ to 820 kΩ

360 kΩ to 820 kΩ

150 kΩ to 330 kΩ

B

12

38.1

820 kΩ to 1.3 MΩ

820 kΩ to 1.3 MΩ

330 kΩ to 680 kΩ

B

13

45.0

1.3 MΩ to 3.3 MΩ

1.3 MΩ to 3.3 MΩ

680 kΩ to 1.5 MΩ

B

14

48.1

3.3 MΩ to 6.8 MΩ

3.3 MΩ to 6.8 MΩ

1.5 MΩ to 3.0 MΩ

B

15

56.5

6.8 MΩ to 10 MΩ

6.8 MΩ to 10 MΩ

3.0 MΩ to 6.2 MΩ

D

16

75.6

—

—

6.2 MΩ to 10 MΩ

D

16

81.0

—

—

—

Thermal Time Constant:

Still Air at 77°F (25°C):

1.6 sec

2.0 sec

3.0 sec

Plunge into Water:

18 msec

23 msec

60 msec

Dissipation Constant:

Still Air at 77°F (25°C):

.14 mW/°C

.16 mW/°C

.30 mW/°C

Still Water at 77°F (25°C):

.70 mW/°C

.80 mW/°C

1.50 mW/°C

Power Rating: (in air)

Maximum Power Rating:

.020 Watts

.025 Watts

.035 Watts

100% Max. Power to:

302 (150°C)

302 (150°C)

302 (150°C)

Derated to 0% at:

572°F (300°C)

572°F (300°C)

572°F (300°C)

Resistance vs temperature characterstics: The nominal resistance range for the zero-power resistance at 77°F (25°C) is shown for each miniature bead-in-glass thermoprobe type and each

available material system. Each material system is denoted by an ordering code letter, a referenced curve number and the nominal 77°F/257°F (25°C/125°C) resistance ratio.