National Semiconductor LMC7221 Tiny CMOS Comparator Data Sheet - Rail-to-Rail Input, Open Drain Output
Summary
This datasheet describes the National Semiconductor LMC7221 tiny CMOS comparator featuring rail-to-rail input and open drain output, available in the space-saving SOT23-5 package measuring under 1.43mm thick. The device operates from 2.7V to 15V supplies with typical current consumption of only 7μA at 5V and a fast response time of 4μs. The open drain output can be pulled up to a voltage higher or lower than the supply, making it suitable for mixed-voltage and multi-supply systems. Input common-
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LM Tiny om parator ith ail-To-R ail Input and pen rain utput
September
LMC7221 Tiny CMOS Comparator with Rail-To-Rail Input and Open Drain Output
Guaranteed specs at 2.7V, 5V, 15V supplies
General Description
Typical supply current µA at 5V
The LM7221 is micropower CMOS comparator available in
Response time of µs at 5V
the space saving SOT23-5 package. This makes this com-
LMC7221 open drain output
parator ideal for space and weight critical designs. The
Input common-mode range beyond V− and V+
LMC7221 is also available in conventional DIP and SO-8
packages. The LMC7221 is supplied in two offset voltage Low input current
grades, m V and m V.
The open drain output can be pulled up with resistor to Applications
voltage which can be higher or lower than the supply Mixed voltage battery powered products voltage this makes the part useful for mixed voltage sys-
Notebooks and PDAs
tems.
PCMCIA cards
For tiny comparator with push-pull output, please see the
Mobile communications
LMC7211 datasheet.
Alarm and security circuits Driving low current LEDs
Features
Direct sensor interface
Tiny SOT 23-5 package saves space Package is less than 1.43 mm thick
Connection Diagrams
8–Pin DIP/SO-8 5-Pin SOT23-5
DS012346-1 DS012346-2
View View
Ordering Information
Package Ordering NSC Drawing Package Transport Media
Information Number Marking
8-Pin DIP LMC7221AIN N08E LMC7221AIN Rails 8-Pin DIP LMC7221BIN N08E LMC7221BIN Rails 8-Pin SO-8 LMC7221AIM M08A LMC7221AIM Rails 8-Pin SO-8 LMC7221BIM M08A LMC7221BIM Rails 8-Pin SO-8 LMC7221AIMX M08A LMC7221AIM 2.5k Units Tape and Reel 8-Pin SO-8 LMC7221BIMX M08A LMC7221BIM 2.5k Units Tape and Reel 5-Pin SOT 23-5 LMC7221AIM5X MA05A C01A 3k Units Tape and Reel 5-Pin SOT 23-5 LMC7221BIM5X MA05A C01B 3k Units Tape and Reel
National Semiconductor Corporation DS012346 www.national.com
Page Summary Contents For National Semiconductor LMC7221 Tiny CMOS Comparator Data Sheet - Rail-to-Rail Input, Open Drain Output
Manual Details
| Brand | National |
|---|---|
| Pages | 12 |
| File Size | 312.77 KB |
| Published | June 16, 2026 |
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Frequently Asked Questions
What is the LMC7221 ideal for in terms of space?
It comes in a tiny SOT23-5 package that saves space and measures less than 1.43 mm thick.
How must I connect the open drain output?
The open drain output can be pulled up with a resistor to various voltages, which can be higher or lower than the supply voltage.
What makes this component suitable for mixed voltage systems?
Its open drain output configuration allows it to work well with mixed voltage battery powered products and general mixed voltage system applications.
What is its low-power consumption at 5V?
The typical supply current (Iq) is very low, reaching 7 μA when operating at a 5V supply.