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. 168-1900
Mfr. Part No.BA2903FVM-TR
BrandROHM
HK$3.226
Each (In a Pack of 25)
units
- Surface Mount MSOP Dual, Single Open Collector 2 1.3µs 8 36 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm -
RS Stock No. 171-5803
Mfr. Part No.BA2901SF-E2
BrandROHM
HK$1.783
Each (On a Reel of 2500)
units
- Surface Mount SOP Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 8.7 x 4.4 x 1.5mm 8.7mm 4.4mm 1.5mm -
RS Stock No. 168-1952
Mfr. Part No.BA2903SFVM-TR
BrandROHM
HK$1.591
Each (In a Pack of 50)
units
- Surface Mount MSOP Dual, Single Open Collector 2 1.3µs 8 36 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm -
RS Stock No. 171-6291
Mfr. Part No.LM2903FVJ-E2
BrandROHM
HK$1.89
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. 171-6313
Mfr. Part No.BU7230G-TR
BrandROHM
HK$2.957
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. 171-5807
Mfr. Part No.LM2903DT
BrandROHM
HK$1.955
Each (On a Reel of 2500)
units
- Surface Mount SOP-J Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 4.9 x 3.9 x 1.37mm 4.9mm 3.9mm 1.37mm -
RS Stock No. 171-5753
Mfr. Part No.LM2903FVJ-E2
BrandROHM
HK$1.249
Each (On a Reel of 2500)
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. 184-8657
Mfr. Part No.BA82903YF-CE2
BrandROHM
HK$6.035
Each (In a Pack of 10)
units
- Surface Mount SOP Single - 2 1.3µs 8 2 → 36 V 5 x 4.4 x 1.5mm 5mm 4.4mm 1.5mm -
RS Stock No. 124-6460
Mfr. Part No.BA8391G-TR
BrandROHM
HK$2.785
Each (In a Pack of 25)
units
General Purpose Surface Mount SSOP Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm -
RS Stock No. 171-5794
Mfr. Part No.BU7232F-E2
BrandROHM
HK$2.342
Each (On a Reel of 2500)
units
Low Voltage CMOS Surface Mount SOP Dual, Single Push-Pull 2 1.7µs 8 1.8 → 5.5 V 5 x 4.4 x 1.5mm 5mm 4.4mm 1.5mm 80dB
RS Stock No. 171-6327
Mfr. Part No.LM393FVJ-E2
BrandROHM
HK$1.439
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. 146-7191
Mfr. Part No.BU7252FVM-TR
BrandROHM
HK$3.383
Each (In a Pack of 25)
units
High Speed CMOS Surface Mount MSOP Dual, Single CMOS, Push-Pull 2 0.55µs 8 1.8 → 5.5 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm 80dB
RS Stock No. 184-8643
Mfr. Part No.BU7230SG-TR
BrandROHM
HK$4.193
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. 171-5774
Mfr. Part No.BU7251SG-TR
BrandROHM
HK$2.212
Each (On a Reel of 3000)
units
High Speed CMOS Surface Mount SSOP Dual, Single Push-Pull 1 0.55µs 5 1.8 → 5.5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 80dB
RS Stock No. 184-8589
Mfr. Part No.BU7250SG-TR
BrandROHM
HK$2.507
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. 401-2221
Mfr. Part No.BA10393F
BrandROHM
HK$3.424
Each (In a Pack of 5)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 5 x 4.4 x 1.5mm 5mm 4.4mm 1.5mm -
RS Stock No. 401-2209
Mfr. Part No.BA10393
BrandROHM
HK$4.96
Each (In a Pack of 5)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.3 x 6.5 x 2.59mm 9.3mm 6.5mm 2.59mm -
RS Stock No. 171-6323
Mfr. Part No.LM2903DT
BrandROHM
HK$2.91
Each (In a Pack of 20)
units
- Surface Mount SOP-J Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 4.9 x 3.9 x 1.37mm 4.9mm 3.9mm 1.37mm -
RS Stock No. 171-5755
Mfr. Part No.LM339FV-E2
BrandROHM
HK$1.415
Each (On a Reel of 2500)
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. 131-2778
Mfr. Part No.BU7251G-TR
BrandROHM
HK$2.954
Each (In a Pack of 10)
units
High Speed CMOS Surface Mount SSOP Dual, Single Push-Pull 1 0.55µs 5 1.8 → 5.5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 80dB