PTCCL21H202DBE datasheet(3/6 Pages) VISHAY

Part #	PTCCL21H202DBE

Description	30 V to 60 V PTC Thermistors For Overload Protection

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Manufacturer	VISHAY [Vishay Siliconix]

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2381 66. 5...1/PTCCL..H....BE

30 V to 60 V PTC Thermistors

For Overload Protection

Vishay BCcomponents

Document Number: 29085

For technical questions, contact: nlr@vishay.com

www.vishay.com

Revision: 29-Jul-09

17

VOLTAGE DERATING AS A FUNCTION OF AMBIENT TEMPERATURE

ELECTRICAL CHARACTERISTICS Imax. AS A FUNCTION OF VOLTAGE

Imax. as stated in the electrical data and ordering information tables, is the maximum overload current that may flow through the

PTC when passing from the low ohmic to high ohmic state at rated voltage.

When other voltages are present after tripping, the Imax. value can be derived from the above Imax. as a function of voltage graph.

Voltages below Vrated will allow higher overload currents to pass the PTC.

TYPICAL TRIP-TIME AS A FUNCTION OF TRIP CURRENT RATIO

Trip-time or switching time (ts)

To check the trip-time for a specific PTC, refer to the Electrical Data and Ordering Information tables for the value Int. Divide the

overload or trip current by this Int and you realize the factor It/Int. This rule is valid for any ambient temperature between 0 °C

and 70 °C. Adapt the correct non-trip current with the appropriate curve in the Current Deviation as a Function of the Ambient

Temperature graph. The relationship between the It/Int factor and the switching time is a function of the PTC diameter; see the

above graphs.

Example

What will be the trip-time at Iol =3Aand Tamb = 0 °C of a thermistor type 2381 661 54711; 2.5 Ω; Ø Dmax. = 8.5 mm:

Int from the table: 470 mA at 25 °C

Int: 470 x 1.12 = 526 mA (at 0 °C).

Overload current = 3 A; factor It/Int: 3/0.526 = 5.70. In the typical trip-time as a function of trip current ratio graph, at the 8.5 mm line

and It/Int = 5.70, the typical trip-time is 1.7 s.

120

100

40

80

60

0

- 25

- 50

0

25

50

75

200

T

amb (°C)

20

100

125

150

175

100

120

150

200

100

150

80

I

max

(%)

70

50

40

0

V

rated (%)

102

10

1

10-1

t

s

12

4

6

8

10

12

14

16

I

t/Int

(7)

(5)

(6)

(3)

(4)

(1)

(2)

Curve 1: Ø Dmax. = 20.5 mm

Curve 2: Ø Dmax. = 16.5 mm

Curve 3: Ø Dmax. = 12.5 mm

Curve 4: Ø Dmax. = 10.5 mm

Curve 5: Ø Dmax. =8.5 mm

Curve 6: Ø Dmax. =7.0 mm

Curve 7: Ø Dmax. =5.0 mm

Measured in accordance

with

“IEC 60738”.

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