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. 401-2215
Mfr. Part No.BA10339
BrandROHM
TWD31.20
Each (In a Pack of 5)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.4 x 6.5 x 3.44mm 19.4mm 6.5mm 3.44mm -
RS Stock No. 184-8584
Mfr. Part No.BU7230SG-TR
BrandROHM
TWD12.60
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. 171-5779
Mfr. Part No.BU5255HFV-TR
BrandROHM
TWD6.90
Each (On a Reel of 3000)
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. 124-6460
Mfr. Part No.BA8391G-TR
BrandROHM
TWD12.40
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. 171-5774
Mfr. Part No.BU7251SG-TR
BrandROHM
TWD9.10
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. 184-8574
Mfr. Part No.BA82901YF-CE2
BrandROHM
TWD24.30
Each (On a Reel of 2500)
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. 401-2243
Mfr. Part No.BA10339F
BrandROHM
TWD9.00
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. 193-5601
Mfr. Part No.BA82901YFV-CE2
BrandROHM
TWD26.80
Each (In a Pack of 5)
units
- Surface Mount SSOP Dual, Single - 4 1.3µs 14 2 → 36 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm -
RS Stock No. 184-8585
Mfr. Part No.BU7232YFVM-CTR
BrandROHM
TWD22.60
Each (On a Reel of 3000)
units
Low Current CMOS Surface Mount MSOP Dual, Single Push-Pull 2 - 8 1.8 → 5.5 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm 80dB
RS Stock No. 184-8657
Mfr. Part No.BA82903YF-CE2
BrandROHM
TWD21.80
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. 171-6280
Mfr. Part No.LM2903FJ-E2
BrandROHM
TWD19.80
Each (In a Pack of 25)
units
- Surface Mount SOP-J Dual, Single Open Collector 2 1µs 8 3 → 32 V 4.9 x 3.9 x 1.37mm 4.9mm 3.9mm 1.37mm -
RS Stock No. 171-6327
Mfr. Part No.LM393FVJ-E2
BrandROHM
TWD16.40
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. 171-6293
Mfr. Part No.BU7251SG-TR
BrandROHM
TWD49.90
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
RS Stock No. 184-8670
Mfr. Part No.BA82903YFVM-CTR
BrandROHM
TWD21.80
Each (In a Pack of 10)
units
- Surface Mount MSOP Single - 2 1.3µs 8 2 → 36 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm -
RS Stock No. 171-5776
Mfr. Part No.BU7252F-E2
BrandROHM
TWD9.60
Each (On a Reel of 2500)
units
High Speed CMOS Surface Mount SOP Dual, Single Push-Pull 2 0.55µs 8 1.8 → 5.5 V 5 x 4.4 x 1.5mm 5mm 4.4mm 1.5mm 80dB
RS Stock No. 146-7275
Mfr. Part No.BU7232FVM-TR
BrandROHM
TWD49.90
Each (In a Pack of 25)
units
Low Voltage CMOS Surface Mount MSOP Single CMOS, Push-Pull 2 1.7µs 8 1.8 → 5.5 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm 80dB
RS Stock No. 184-8553
Mfr. Part No.BA2903YFV-CE2
BrandROHM
TWD11.40
Each (On a Reel of 2500)
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. 184-8654
Mfr. Part No.BU7232YFVM-CTR
BrandROHM
TWD25.10
Each (In a Pack of 10)
units
Low Current CMOS Surface Mount MSOP Dual, Single Push-Pull 2 - 8 1.8 → 5.5 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm 80dB
RS Stock No. 177-9876
Mfr. Part No.BA2903YF-CE2
BrandROHM
TWD12.80
Each (On a Reel of 2500)
units
- Surface Mount SOP Single Open Collector 2 1.3µs 8 +36 V 5 x 4.4 x 1.39mm 5mm 4.4mm 1.39mm -
RS Stock No. 171-5755
Mfr. Part No.LM339FV-E2
BrandROHM
TWD5.80
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 -