Resistor equipped transistors are compact for wearable devices

A double space saving is provided with the 500mA resistor equipped transistors (RETs) said Nexperia. They integrate bipolar junction transistors and resistors in a single package to enable high-power load switching in space constrained applications.
The 12 RETs are in compact DFN2020(D)-6 packaging and designed for load switching in wearables and smartphones as well as for use in digital circuits with higher power requirements, such as space constrained computing, communications, industrial and automotive applications.
The RET in DFN configuration achieves dual space-saving feats, said Nexperia. Firstly, integrating the bipolar junction transistor (BJT) and resistor into a single package offers substantial board space savings and secondly, the leadless DFN packaging contributes to space savings.
The RETs deliver the specified 500mA output current from a tiny DFN2020(D)-6 package measuring only 2.0 x 2.0 x 0.65mm. This packaging is particularly suitable for  thermal performance in high power applications, delivering up to 1W total output power from collector-emitter voltages (VCEO, open base) up to 50V.

To reduce component count and simplify board design, the 12 new RETs combine dual BJTs with bias resistors and include a second integrated resistor parallel to the base-emitter path to create a voltage divider that sets the base voltage. This offers finer tuning and better turn-off characteristic behaviour, claimed Nexperia. The internal resistors have higher tolerances than external resistors, making the RETs suitable for switching applications where transistors operate in an on- or off-state, helping to overcome the temperature dependence of standard BJTs. They also help to reduce the costs associated with pick and place and manual handling, added Nexperia.
The new RETs are available in a choice of dual NPN / NPN, NPN / PNP and PNP / PNP options.
They join Nexperia’s RET portfolio which is available as standard and automotive (AEC-Q101 qualified) parts.
Headquartered in the Netherlands, Nexperia is a semiconductor company with employees across Europe, Asia, and the United States.

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