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
New
RS Stock No. 192-4829
Mfr. Part No.TS883IST
£1.29
Each (In a Pack of 5)
Units
Nano Power Surface Mount MiniSO Single Rail to Rail 2 - 8 0.9 → 5.5 V 3.2 x 3.1 x 0.95mm 3.2mm 3.1mm 0.95mm 68dB
RS Stock No. 145-3854
Mfr. Part No.LM2901VDR2G
£0.099
Each (On a Reel of 2500)
Units
General Purpose Surface Mount SOIC Dual, Single CMOS, TTL 4 1.3µs 14 3 → 36 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS Stock No. 171-5777
Mfr. Part No.BU7230G-TR
BrandROHM
£0.216
Each (On a Reel of 3000)
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. 175-1627
Mfr. Part No.TLV7031DPWR
£0.167
Each (On a Reel of 3000)
Units
Low Voltage Surface Mount X2SON Single Push-Pull 1 - 5 1.6 → 6.5 V 0.85 x 0.85 x 0.35mm 0.85mm 0.85mm 0.35mm 73dB
RS Stock No. 178-2408
Mfr. Part No.NJM12903M
£0.211
Each (In a Tube of 100)
Units
General Purpose Surface Mount DMP Single Open Collector 2 0.5µs 8 3 → 12 V 5 x 5 x 1.6mm 5mm 5mm 1.6mm -
RS Stock No. 168-1886
Mfr. Part No.BA2903FV-E2
BrandROHM
£0.608
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 -
New
RS Stock No. 191-3362
Mfr. Part No.MAX901AESE+
£13.18
Each
Units
High Speed, Low Power Surface Mount SO Dual, Single TTL 4 10ns 16 5 → 10 V 10 x 4 x 1.5mm 10mm 4mm 1.5mm 75µV/V
New
RS Stock No. 192-1928
Mfr. Part No.MAX944ESD+
£4.131
Each (In a Tube of 50)
Units
Low Power Surface Mount SOIC Single Push-Pull 4 - 14 2.7 → 5.5 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm 80µV/V
RS Stock No. 184-8589
Mfr. Part No.BU7250SG-TR
BrandROHM
£0.303
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. 177-2874
Mfr. Part No.MCP6547T-E/MS
BrandMicrochip
£0.367
Each (On a Reel of 2500)
Units
Rail to Rail Surface Mount MSOP Single Open Drain 2 4µs 8 - 3 x 3 x 0.95mm 3mm 3mm 0.95mm 70dB
RS Stock No. 133-3381
Mfr. Part No.LM2903M8-13
£0.05
Each (In a Pack of 50)
Units
Dual Differential Surface Mount MSOP Dual, Single CMOS, MOS, TTL 2 300ns 8 2 → 36 V 3.1 x 3.05 x 0.95mm 3.1mm 3.05mm 0.95mm -
RS Stock No. 171-6293
Mfr. Part No.BU7251SG-TR
BrandROHM
£1.147
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. 178-2407
Mfr. Part No.NJM2901M
£0.386
Each (In a Tube of 100)
Units
General Purpose Surface Mount DMP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 10 x 5 x 1.6mm 10mm 5mm 1.6mm -
RS Stock No. 829-4408
Mfr. Part No.LM2903WYPT
£0.078
Each (In a Pack of 15)
Units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 4.4 x 3 x 1.05mm 4.4mm 3mm 1.05mm -
RS Stock No. 168-1884
Mfr. Part No.BA2901FV-E2
BrandROHM
£0.568
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 -
New
RS Stock No. 191-5140
Mfr. Part No.MAX921EPA+
£3.85
Each (In a Pack of 2)
Units
- Through Hole PDIP Dual, Single CMOS, TTL 1 14µs 8 2.5 → 11 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 0.1mV/V
Related Products
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The Texas Instruments LM193, LM293, LM393 and LM2903 are dual differential input voltage comparators designed to operate from a single power supply over a wide range of voltages. The common mode input voltage range includes ground and the devices have open collector outputs.
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A range of high speed voltage comparators from Texas Instruments featuring response times of less than 200 ns. The range includes ultra-fast devices such as the TL3016 and TL3116 which have complementary (differential) outputs and typical switching times of 10 ns or less.
The Texas Instruments LM193, LM293, LM393 and LM2903 ...
Description:
The Texas Instruments LM193, LM293, LM393 and LM2903 are dual differential input voltage comparators designed to operate from a single power supply over a wide range of voltages. The common mode input voltage range includes ground and the devices have open collector outputs.
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Texas Instruments’ range of voltage comparators includes not only conventional single, dual and quad comparator packages but also window comparators and over- & under-voltage supervisors.Although comparators and operational amplifiers are superficially similar devices their operation in practical applications is very different. Op amps are intended for linear operation accompanied by ...