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. 168-1984
Mfr. Part No.BA2903F-E2
BrandROHM
HK$2.106
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. 171-6313
Mfr. Part No.BU7230G-TR
BrandROHM
HK$5.25
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. 178-0408
Mfr. Part No.BA2903YF-CE2
BrandROHM
HK$4.19
Each (In a Pack of 10)
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. 168-1886
Mfr. Part No.BA2903FV-E2
BrandROHM
HK$6.44
Each (In a Pack of 25)
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. 133-3216
Mfr. Part No.LM393DT
BrandROHM
HK$4.133
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. 171-6327
Mfr. Part No.LM393FVJ-E2
BrandROHM
HK$3.61
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. 168-1884
Mfr. Part No.BA2901FV-E2
BrandROHM
HK$6.08
Each (In a Pack of 25)
units
- Surface Mount SSOP Dual, Single Open Collector 4 1.3µs 14 36 V 5 x 4.4 x 1.05mm 5mm 4.4mm 1.05mm -
RS Stock No. 401-2243
Mfr. Part No.BA10339F
BrandROHM
HK$2.298
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. 731-3619
Mfr. Part No.BA2903SFV-E2
BrandROHM
HK$5.06
Each (In a Pack of 10)
units
General Purpose Surface Mount SSOP Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 3 x 4.4 x 1.15mm 3mm 4.4mm 1.15mm -
RS Stock No. 171-6247
Mfr. Part No.BU5265HFV-TR
BrandROHM
HK$4.294
Each (In a Pack of 25)
units
Push-Pull Output Surface Mount HVSOF Dual, Single Push-Pull 1 0.5µs 5 1.8 → 5.5 V 1.6 x 1.2 x 0.58mm 1.6mm 1.2mm 0.58mm 80dB
RS Stock No. 171-6233
Mfr. Part No.LM393FVM-TR
BrandROHM
HK$3.61
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. 401-2209
Mfr. Part No.BA10393
BrandROHM
HK$5.356
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. 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. 184-8640
Mfr. Part No.BA82901YF-CE2
BrandROHM
HK$11.89
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. 131-2778
Mfr. Part No.BU7251G-TR
BrandROHM
HK$8.73
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
HK$6.035
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. 171-6311
Mfr. Part No.LM339FV-E2
BrandROHM
HK$6.128
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. 184-8654
Mfr. Part No.BU7232YFVM-CTR
BrandROHM
HK$6.391
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. 171-6325
Mfr. Part No.LM393F-GE2
BrandROHM
HK$2.55
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. 401-2221
Mfr. Part No.BA10393F
BrandROHM
HK$1.564
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 -