FT821X Datasheet, PDF (4/6 Pages) List of Unclassifed Manufacturers – The FT821x is a current-mode PFC controller operating in Transition Mode (TM). The FT821x has rich protections.

Fremont Micro Devices
ORDERING INFORMATION
FT821①②
DESIGNATOR SYMBOL
①
A
B
SYMBOL
②
a
b
DUAL OUTPUT VOLTAGE
NO
YES
PACKAGE TYPE
SOP-8
DIP-8
Table 2
MARKING RULE
FT821x Preliminary
FT821①
②③④
Figure 3
① Represent with or without dual output voltage function
②③④ for internal reference
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DS821x –A3