Comparators

What is a Comparator?

A Comparator is a circuit which accepts two voltages or currents and then switches the output showing which is bigger. Comparators are found in components like analogue to digital converters. Comparators are like operational amplifiers except a comparator is designed to operate with positive feedback and output saturated at one power rail or the other.

How a Comparator works.
A comparator samples two input pins and turns on the output when identifying a difference or similarity.
An example is when you have a minus voltage on the inverting Pin and a plus non-inverting. When the voltage, on the non-inverting equals the inverting voltage the Pin turns on. Normally the output Pin is open and switches to ground when the comparator is activated.

Why use a Comparator?
The primary use of a comparator is converting analog to digital (ADC). Two supply voltage are applied and the difference determines a high or low digital signal.

Types of Comparator.
Current sense, Differential / Dual differential, Dual / Dual CMOS, Dual voltage / General voltage, General purpose, Ground sense, High speed / high-speed CMOS, Low current CMOS, Low power / low voltage / low-power CMOS, Micro power, Nano power, Precision, Push/pull output, Quad differential, Rail to rail, Voltage, Window.

Mounting Types.
Surface mount
Through hole
Comparator power supply types.
Dual
Single

Various package types, pins, sizes, channels per chip, PSRR (power supply rejection ratio), CMRR (common mode rejection ratio) are all available.

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Description Price Comparator Type Mounting Type Package Type Power Supply Type Output Type Number of Channels per Chip Typical Response Time Pin Count Typical Single Supply Voltage Dimensions Length Width Height Typical CMRR
RS Stock No. 731-3482
Mfr. Part No.BA10339F-E2
BrandROHM
SGD0.421
Each (In a Pack of 10)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 4 1.3µs 14 3 → 36 V 8.7 x 4.4 x 1.5mm 8.7mm 4.4mm 1.5mm -
RS Stock No. 401-2243
Mfr. Part No.BA10339F
BrandROHM
SGD0.462
Each (In a Pack of 5)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 8.7 x 4.4 x 1.39mm 8.7mm 4.4mm 1.39mm -
RS Stock No. 184-8589
Mfr. Part No.BU7250SG-TR
BrandROHM
SGD0.44
Each (On a Reel of 3000)
units
Low Current CMOS Surface Mount SSOP Dual, Single Open Drain 1 - 5 1.8 → 5.5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 80dB
RS Stock No. 184-8643
Mfr. Part No.BU7230SG-TR
BrandROHM
SGD0.785
Each (In a Pack of 25)
units
Low Current CMOS Surface Mount SSOP Dual, Single Open Drain 1 - 5 1.8 → 5.5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 80dB
RS Stock No. 171-6325
Mfr. Part No.LM393F-GE2
BrandROHM
SGD0.27
Each (In a Pack of 25)
units
- Surface Mount SOP Dual, Single Open Collector 2 1µs 8 3 → 32 V 5 x 4.4 x 1.5mm 5mm 4.4mm 1.5mm -
RS Stock No. 168-1934
Mfr. Part No.BA2903SFV-E2
BrandROHM
SGD0.344
Each (In a Pack of 50)
units
- Surface Mount SSOP Dual, Single Open Collector 2 1.3µs 8 36 V 3 x 4.4 x 1.5mm 3mm 4.4mm 1.5mm -
RS Stock No. 184-8660
Mfr. Part No.BA2903YFV-CE2
BrandROHM
SGD0.868
Each (In a Pack of 10)
units
- Surface Mount SSOP Single - 2 1.3µs 8 2 → 36 V 4.4 x 3 x 1.15mm 4.4mm 3mm 1.15mm -
RS Stock No. 171-6233
Mfr. Part No.LM393FVM-TR
BrandROHM
SGD0.27
Each (In a Pack of 25)
units
- Surface Mount MSOP Dual, Single Open Collector 2 1µs 8 3 → 32 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm -
RS Stock No. 168-1984
Mfr. Part No.BA2903F-E2
BrandROHM
SGD0.503
Each (In a Pack of 25)
units
- Surface Mount SOP Dual, Single Open Collector 2 1.3µs 8 36 V 5 x 4.4 x 1.39mm 5mm 4.4mm 1.39mm -
RS Stock No. 171-5751
Mfr. Part No.LM2901FVJ-E2
BrandROHM
SGD0.423
Each (On a Reel of 2500)
units
- Surface Mount TSSOP-BJ Dual, Single Open Collector 4 1µs 14 3 → 32 V 3 x 3 x 0.85mm 3mm 3mm 0.85mm -
RS Stock No. 133-3216
Mfr. Part No.LM393DT
BrandROHM
SGD0.545
Each (In a Pack of 10)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 2 300ns 8 2 → 36 V 4.9 x 3.9 x 1.37mm 4.9mm 3.9mm 1.37mm -
RS Stock No. 171-6291
Mfr. Part No.LM2903FVJ-E2
BrandROHM
SGD0.354
Each (In a Pack of 25)
units
- Surface Mount TSSOP-BJ Dual, Single Open Collector 2 1µs 8 3 → 32 V 3 x 3 x 0.85mm 3mm 3mm 0.85mm -
RS Stock No. 146-7005
Mfr. Part No.BU7252FVM-TR
BrandROHM
SGD0.554
Each (On a Reel of 3000)
units
High Speed CMOS Surface Mount MSOP Dual, Single CMOS, Push-Pull 2 550ns 8 1.8 → 5.5 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm 80dB
RS Stock No. 171-6313
Mfr. Part No.BU7230G-TR
BrandROHM
SGD0.554
Each (In a Pack of 20)
units
Low Current CMOS Surface Mount SSOP Dual, Single Open Drain 1 1.8µs 5 1.8 → 5.5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 80dB
RS Stock No. 171-6239
Mfr. Part No.BU5255HFV-TR
BrandROHM
SGD0.48
Each (In a Pack of 20)
units
Low Current CMOS Surface Mount HVSOF Dual, Single Push-Pull 1 1.6µs 5 1.8 → 5.5 V 1.6 x 1.2 x 0.58mm 1.6mm 1.2mm 0.58mm 80dB
RS Stock No. 171-5805
Mfr. Part No.BA2901SFV-E2
BrandROHM
SGD0.33
Each (On a Reel of 2500)
units
- Surface Mount SSOP Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm -
RS Stock No. 171-6311
Mfr. Part No.LM339FV-E2
BrandROHM
SGD0.401
Each (In a Pack of 25)
units
- Surface Mount SSOP-B Dual, Single Open Collector 4 1µs 14 3 → 32 V 3 x 4.4 x 1.15mm 3mm 4.4mm 1.15mm -
RS Stock No. 171-6301
Mfr. Part No.LM2903FVM-TR
BrandROHM
SGD0.354
Each (In a Pack of 25)
units
- Surface Mount MSOP Dual, Single Open Collector 2 1µs 8 3 → 32 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm -
RS Stock No. 184-8640
Mfr. Part No.BA82901YF-CE2
BrandROHM
SGD1.392
Each (In a Pack of 10)
units
- Surface Mount SOP Single - 3 1.3µs 8 2 → 36 V 5 x 4.4 x 1.5mm 5mm 4.4mm 1.5mm -
RS Stock No. 171-6321
Mfr. Part No.BA2903YFVM-CTR
BrandROHM
SGD0.777
Each (In a Pack of 10)
units
- Surface Mount MSOP Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm -