By Gary Thomas
In response to specific demands by designers and battery manufacturers, TE Circuit Protection has launched the MHP-TA series of ultra-low-profile resettable thermal cut-off (TCO) devices for lithium battery protection.
Measuring 5.8, 3.75 and 1.15 mm in length, width and height, respectively, the MHP-TA series of devices consists of two product categories having varied levels of current-carrying capacity, a 9 V dc rating, and multiple cut-off temperature ratings.
The MHP-TA series is built on the innovative MHP (Metal Hybrid PPTC) technology of TE Circuit Protection. This technology integrates a bimetal protector in parallel with a polymeric positive temperature coefficient (PPTC) device. The MHP30-36 and MHP-SA series that represents the initial MHP product offerings are effective for higher-current (over 30 V dc, 30 A) Li-ion battery pack applications adopted in portable energy storage systems and power tools.
The new MHP-TA series targets applications having lower voltage and current ratings. TE Circuit Protection therefore has successfully economized the MHP product to result in an ultra-compact device that promotes space efficiency to the expanding LiP market. The MHP-TA series brings resettable overtemperature protection to battery cell designs. The PPTC functions as a heater, bolting the bimetal until the detachment of fault.
The MHP-TA series consists of nine devices having two levels of current carrying capacity as follows:
- Low-current MHP-TA6-9 products with up to 6A hold current at 25°C
- High-current MHP-TA15-9 products with a hold current of up to 15A.
Models feature High Current (MHP-TA15) Devices such as MHP-TA15-9-82, MHP-TA15-9-72, MHP-TA15-9-77, MHP-TA15-9-90, and MHP-TA15-9-85; and Low Current (MHP-TA6-9) Devices such as MHP-TA6-9-82, MHP-TA6-9-85, MHP-TA6-9-77, and MHP-TA6-9-72. Samples are now being offered.