PSSI2021SAY

DISCRETE SEMICONDUCTORS DATA SHEET k, halfpage MBD127 PSSI2021SAY Constant current source Product specification 2001 May 07 Philips Semiconductors Product specification Constant current source FEATURES One chip constant current source Reduced number of components and board space. APPLICATIONS Especially suitable for space reduction in, for example, LED driving circuits or active bias controlling. DESCRIPTION Resistor equipped PNP transistor with two diodes on one chip in a plastic SC-88A package. Built-in bias resistor and two diodes allow operation as constant current source. The stabilized current can be adjusted between 15 µA and 50 mA by connection of external resistors between pins 4 and 5. MARKING TYPE NUMBER PSSI2021SAY MARKING CODE S1p 5 handbook, halfpage 4 5 PSSI2021SAY PINNING PIN 1 2 3 4 5 SYMBOL n.c. Istab/Vout GND Rexternal VS DESCRIPTION not connected stabilized current/output voltage ground external resistor supply voltage 4 1 2 3 Top view 1 n.c. 2 3 MGU348 Fig.1 Simplified outline (SC-88A) and symbol. LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 60134). SYMBOL VS Vout VR Istab Ptot Tstg Tj Tamb Note 1. Device mounted on a FR4 printed-circuit board. PARAMETER supply voltage output voltage reverse voltage continuous stabilized current (DC) total power dissipation storage temperature junction temperature operating ambient temperature Tamb ≤ 25 °C; note 1 VS = 75 V between all terminals CONDITIONS − − − − − −65 ...