The AP78LXX Series is a three terminal positive regulator
available with fixed output voltages from 5V, 8V and 12V,
making them useful in a wide range of applications. When
used as a Zener diode/resistor combination replacement, the
AP78LXX can improve output impedance by two orders of
magnitude, and lower quiescent current. These regulators
can provide local on card regulation, eliminating the
distribution problems associated with single point regulation.
The voltages available allow the AP78LXX's to be used in
logic systems. Instrumentation, HiFi and other solid state
electronic equipment.
The AP78LXX is available in the plastic TO92, SOT89 and
SO-8 using industrial standard package technology. The
regulator can deliver 100mA output current with adequate
heat sinking. Current limiting is included to limit the peak
output current to a safe value. Safe area protection for the
output transistors is provided to limit internal power
dissipation. Thermal overload protection is integrated to
prevent the IC from overheat due to abnormal condition.
Features
Pin Assignments
(Bottom View)
V
1
V
OUT
GND
2
3
GND
NC
4
AP78L05/08/12
V
GND
OUT
TO92
(To p V iew)
SO-8
Top View
IN
V
8
IN
GND
7
6
GND
NC
5
• Output voltages of 5.0V, 8.0V, 12V
• Output voltage tolerances of ±5% over the operating
temperature ranges
• Output current in excess of 100mA
• Internal thermal overload protection
• Output transistor safe area protection
• Internal short circuit current limiting
• No external components
• Available in plastic TO92, SOT89 and plastic SO-8 low
profile packages
• Lead Free Package: TO92 (Note 1)
• SO-8 and SOT89: Available in “Green” Molding
Compound (No Br, Sb) (Note 2)
•Lead Free Finish / RoHS Compliant (Note 3)
Applications
• Communication
• CD-ROM
• DVD-Player
• Set-Top Box
123
GND
V
V
OUT
SOT8
IN
Notes: 1. TO92 is available in “Lead Free” product only.
2. SO-8 and SOT89 are available in “Green” products only.
3. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2). All applicable RoHS exemptions applied.
(†) Required if the regulator is located more than 3” from the power supply filter
(‡) See Note 5 in the electrical characteristics table
IN
OUT
‡
C2
0.1µF
Pin Descriptions
Pin Name Description
VIN
V
OUT
GND Ground
NC No Connection
Operating Voltage Input
Voltage Output Pin
Functional Block Diagram
Introduction
The AP78LXX series is a three terminal device with fixed output voltages from 5V,8V and 12V. T he AP78LXX fixed voltage
regulator series has built-in thermal overload protection which prevents the device from being damaged due to excessive
junction temperature. The regulator also contains internal short-circuit protection which limits the maximum output current, an d
safe-area protection for the pass transistor which reduces the short-circuit current as the voltage across the pass transistor is
increased.
AP78LXXSG-13 S SO-8 NA NA 2500/Tape & Reel -13
AP78LXXYG-13 Y SOT89 NA NA 2500/Tape & Reel -13
Notes: 8. TO92 is available in “Lead Free” product only.
9. SO-8 and SOT89 are available in “Green” products only.
10. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
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