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PSSI2021SAY
Constant current source
Philips Semiconductors Product specification
Constant current source PSSI2021SAY
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.
DESCRIPTIONResistor equipped PNP transistor with two diodeson one
chipina plastic SC-88A package. Built-in bias resistor and
two diodes allow operation as constant current source.
The stabilized current canbe adjusted between15μA and mA by connection of external resistors between
pins4 and5.
MARKING
PINNING
LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 60134).
Note Device mounted on a FR4 printed-circuit board.
Philips Semiconductors Product specification
Constant current source PSSI2021SAY
THERMAL CHARACTERISTICS
Note Device mounted on a FR4 printed-circuit board.
CHARACTERISTICSTamb =25 °C unless otherwise specified.
Philips Semiconductors Product specification
Constant current source PSSI2021SAY
PACKAGE OUTLINE
Plastic surface mounted package; 5 leads SOT353
Philips Semiconductors Product specification
Constant current source PSSI2021SAY
DATA SHEET STATUS
Notes Please consult the most recently issued data sheet before initiating or completing a design. The product status of the device(s) described in this data sheet may have changed since this data sheet was
published. The latest information is available on the Internet at URL .
DEFINITIONS
Short-form specification The data in a short-form
specification is extracted from a full data sheet with the
same type number and title. For detailed information see
the relevant data sheet or data handbook.
Limiting values definition Limiting values given arein
accordance with the Absolute Maximum Rating System
(IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device.
These are stress ratings only and operation of the device theseorat any other conditions abovethosegivenin the
Characteristics sectionsof the specificationis not implied.
Exposure to limiting values for extended periods may
affect device reliability.
Application information Applications that are
described herein for any of these products are for
illustrative purposes only. Philips Semiconductors make representationor warranty thatsuch applications willbe
suitable for the specified use without further testing or
modification.
DISCLAIMERS
Life support applications These products are not
designed for use in life support appliances, devices, or
systems where malfunction of these products can
reasonablybe expectedto resultin personal injury. Philips
Semiconductors customers usingor selling these products
for use in such applications do so at their own risk and
agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Right to make changes Philips Semiconductors
reserves the rightto make changes, without notice,in the
products, including circuits, standard cells, and/or
software, described or contained herein in order to
improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for
the useof anyof these products, conveysno licence ortitle
under any patent, copyright, or mask work right to these
products, and makesno representationsor warranties that
these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified.
Philips Semiconductors Product specification
Constant current source PSSI2021SAY
NOTES
