PTCEL

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Vishay BCcomponents

Revision: 31-May-16

2

Document Number: 29165

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

OUTLINE AND DIMENSIONS in millimeters

REQUIRED NUMBER OF PTC THERMISTORS TO LIMIT CURRENT AND ABSORB ENERGY

By using several PTC’s in a series / parallel network, the maximum current limitation and absorbed energy levels can be further

optimized. For homogeneous current and energy distribution it is recommended to combine only PTCEL of the same size and

matched resistance value. Energy absorption per PTC in a network depends on current distribution in the network and as such

on the individual PTC resistance value. PTCEL thermistors might be used in a series connection to further lower the inrush

current, but not to increase the maximum allowed voltage levels. Following formula may be used to calculate the minimum

number of PTCEL thermistors required in a DC link or other capacitor bank application to properly charge or discharge a given

amount of energy without follow current:

N



Notes

• N is the number of PTCEL required in the network.

• C is the total capacitor value to charge or discharge in F.

• V is the maximum DC voltage on the capacitor C.

H2

H3

L1

d

F

DT

COMPONENT DIMENSIONS in millimeters

PTCEL13

PTCEL17

D

13 max.

17 max.

H1

17 max.

21 max.

H2

3 ± 1

3 ± 1

d

0.6 ± 0.06

0.8 ± 0.08

L1

20 min.

20 min.

F

5 ± 0.8

5 ± 0.8

T

7.0 max.

7.5 max.

C x V

2

2

T



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