Product Overview
Metal Hybrid PPTC Devices with Thermal Activation
(MHP-TA Series)
Resettable overtemperature protection for Lithium Polymer (LiP) and prismatic cells
used in various portable electronic applications.TE Connectivity Metal Hybrid PPTC (MHP-TA) Devices
The rapidly expanding market for ultra-thin portable electronic devices such as media
tablets and ultra-thin PCs has created demand for very thin, low-profile, light-weight and
high-capacity Lithium Polymer (LiP) and prismatic cells.
A new MHP (Metal Hybrid PPTC) device, the MHP-TA, offers a 9V rating and a higher
DC
current rating than typical battery strap devices to meet the battery safety requirements
of higher-capacity LiP and prismatic batteries found in the latest tablet and ultra-thin
computing products. Hybrid MHP technology connects a bimetal protector in parallel with
a PPTC (polymeric positive temperature coefficient) device. The resulting MHP-TA device
helps provide resettable overtemperature protection, while utilizing the PPTC device to act
as a heater and to help keep the bimetal latched until the fault is removed.
APPLICATIONS
Battery cell protection for high-capacity Lithium Polymer and prismatic cells used in:
- Media tablets
KEY FEATURES
- Ultra-thin notebook PCs
- E-readers
9V rating
DC
BENEFITS
Two levels of current carrying capacity:
low current (approximately 6A
Capable of handling the higher voltages and battery discharge rates found in high-
hold current @25C) capacity LiP and prismatic cell applications.
high current (approximately 15A
Provides resettable overtemperature protection in high-capacity LiP and prismatic cell
applications.
hold current @25C)
Multiple activation temperature ratings
DESIGN CONCEPT
(72C, 77C, 82C, 85C, 90C)
In normal operation, current passes through the bimetal contact due to its low contact
Miniature size allows for compact
resistance. During an abnormal event, the device reacts to the rise in cell temperature
battery pack designs
causing the bimetal contact to open at the specified temperature and its contact resistance
to increase.
At this point, the current shunts to the lower resistance PPTC which acts as a heater and
helps keep the bimetal protector open and in a latched position until the fault is removed.
te.com/MHP-Launch/