PolyTron™ PTC Device Selection Guide Datasheet by Eaton - Electronics Division
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BUSSMANN
V SERIES
EATON
Powering Business Worldwide
Eaton's PolyTron™ PTC device
selection guide
Selecting Polymer Positive
Temperature Coefficient
(PTC) devices for overcurrent
and overtemperature
protection
Eaton's Bussmann® Series
family of PolyTron™ PTC
devices is ideally suited for
protecting applications sensitive
to high ambient operating
temperatures or subject to
frequent overcurrent conditions.
PTCs operate as a positive
temperature coefficient device.
High temperatures and
excessive current will cause the
device resistance to increase
until it limits the unsafe current
level.
Upon reaching the design
temperature/current limit, the
PTC will effectively “open” the
circuit to provide protection from
the overcurrent or elevated
ambient temperature condition.
Once the fault is removed or
the ambient temperature
cools, the PTC will
automatically “reset” and
conduct safe current levels
again, allowing current to flow
through the circuit.
PTCs are commonly used in
applications where constant
uptime is required and/or in
circuits not easily accessible
by a user or service
technician.
Available in surface mount
and radial packages, Eaton's
Bussmann series PolyTron
PTC devices help improve the
safety and reliability of
customer equipment
worldwide.
PolyTron PTC device
packages
•Radial: 16, 30 and 60
Vdc from 0.10 to 15
amps
•Surface Mount: 1206
and 1812 - 6-60 Vdc
from 0.1 to 3.0 amps
PTC resettable devices
Features:
•Fast trip times and
resettable protection
•Overcurrent and over
temperature protection
•Wide range of current
(Ihold) and voltage
(Vmax) offerings
•Low resistance
•RoHS compliant, lead-
free, halogen-free
Applications
•Medical equipment
•Industrial power and
transmission
•White goods
•Telecommunications and
networking
•Computer and
peripherals
•Consumer and
automotive electronics
•Battery and rechargeable
devices
Agency information
•cULus – UL Recognition
for US and Canada
•TÜV – European
Standard (Germany
Agency)
ESPN
Paws/mg Bus/"9:: Wu/Idwrds
Eaton is a registered trademark.
All other trademarks are property
of their respective owners.
Eaton
Electronics Division
1000 Eaton Boulevard
Cleveland, OH 44122
United States
www.eaton.com/electronics
© 2017 Eaton
All Rights Reserved
Printed in USA
Publication No. 4066
December 2017
For more information visit:
www.eaton.com/fuses
TV
+78%
+29%
Usable Energy (0.3 V derating, 60 F comparison)
HV
HB
TV
Peak Power (60 F comparison)
HV
HB
+177%
+62%
TV
Total Stored Energy (60 F comparison)
HV
HB
TV
Peak Power (60 F comparison)
HV
HB
+177%
+62%
+44%
+17%
TV
Total Stored Energy (60 F comparison)
HV
HB
TV
+78%
+29%
Usable Energy (0.3 V derating, 60 F comparison)
HV
HB
+44%
+17%
Introduction
This is a general selection guide.
Its intent is to provide an
understanding of the package
styles and ratings most suited for
an application. For final selection,
please consult your local Eaton
representative or website for
additional details.
Eaton Bussmann Series
PolyTron™ PTC devices are
ideally suited for applications
encountering frequent
overcurrent conditions for which
traditional fuse protection would
prove impractical or undesirable
such as consumer electronics, I/
O ports, medical equipment and
process control applications
where constant uptime is
required.
PolyTron PTC device selection
1) Determine circuit
parameters:
a. Normal operating
current – Ihold
b. Maximum circuit
voltage – Vmax
c. Ambient operating
temperature – °C
d. Maximum fault
current – Imax
2) Select package (radial lead
or SMD Chip) based on
size constraints and PCB
assembly method.
3) Compare PolyTron™ PTC
device data sheet ratings for
Vmax and Imax at
www.eaton.com/electronics.
The circuit parameters should
not exceed the ratings of the
device.
4) Verify that the ambient
operating temperature of the
circuit is within the device’s
normal operating range.
Thermally derate Ihold and Imax
as necessary using the equation:
a. Ihold = Imax/
Thermal derating
factor
PolyTron PTC Device Family
Surface Mount Radial Leaded
PTS1206 PTS1812 PTR016V PTR030V PTR060V
Specifications
Chip Size 1206 1812 - - - - - -
Hold Current (Ihold)0.05-2.0 A 0.10-3.0 A09-15.0 A 0.90-9.0 A0.10-3.75 A
Max Voltage (Vmax)6-60 V 6-60 V 16 V 30 V 60 V
Max Fault Current (Imax) 100 A10-100 A 40-100 A 40-100 A 40 A
Operating Temperature Range - °C -40/+85 -40/+85 -40/+85 -40/+85 -40/+85
Applications Application Areas
CPU X
USB X X X
IEEE 1284 Parallel data bus X X X
IEEE 802.3 X
Computers IEEE 1394 X X
I/O Ports X X X
PC Card X X X
SCSI X X X
Video port X X X
LCD Monitor X X X
Set top box X X
Loudspeaker X
Smart card reader X
Consumer Mobile phone X
Electronics Linear AC/DC adapter X X X X
Portable electronic input port X X
Electromagnetic loads, motors X X
Solenoid protection X X X
Medical Voltage/current input terminals X X
Electronics
5) Check that the trip time will
adequately protect the
circuit.
6) Verify that the post trip
resistance (R1max) of the
device is taken into
account.
7) Test and evaluate the
suitability and performance
of the chosen PolyTron PTC
device in the actual
application.
Technical Application Assistance
Call 636-527-1270
E-mail fusetech@eaton.com
Data Sheets: www.eaton.com/electronics
Order samples on-line: https://
tools.eatonelectronics.com/request-form
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