Hauppauge, N.Y. Zetex Semiconductors has added a pair of low-voltage PNP transistors to its line of low-saturation, high-current SOT23FF devices. The ZXTP25020CFF and ZXTP19020DFF combine standard SOT23 footprints with a reduced off-board height of less than 1 mm. The devices are said to reduce component count, increase power density and serve as cost-effective switchers in a variety of slim-line portable applications including linear charging and high-side load switching circuits.
The SOT23FF package improves thermal resistance up to 158°C/W, and provides a power rating of 0.8 W in a 15 x 15-mm PCB area. Compared to standard SOT23 solutions, this is a substantial increase in power density, which can rise up to 1.96 W in applications with 50 x 50-mm of PCB space, said Zetex.
The ZXTP25020CFF reduces printed-circuit-board (PCB) area requirements by up to 50% when compared to P-channel MOSFETs of a similar footprint, which due to their inherent drain-source body diode, require a series-connected Schottky diode, said Zetex. The ZXTP25020CFF eliminates this Schottky requirement by guaranteeing a reverse blocking capability of 7 volts, said the company.
In high-side switching and load or disconnect switches, the ZXTP19020DFF reduces the voltage drop to 70 mV at 1 A with a 20 mA base drive, or 160 mV at 2 A with a 40 mA base drive. These drops can be extrapolated to an equivalent resistance of 70 mΩ in a 2.5 x 3-mm PCB footprint.
Pricing: Model ZXTP25020CFF is priced at $0.17, and model ZXTP19020DFF is priced at $0.21, both in quantities of 10,000.
Availability: Delivery is four to six weeks in production volumes.
Product information: SOT23FF bipolar transistors
Zetex Semiconductor, 1-631-360-2222, www.zetex.com