Comparators

A Comparator is a circuit that accepts two voltages or currents and then switches the output showing which of the two is bigger. Comparators are found in components such as analogue to digital converters (ADCs). Comparators are like operational amplifiers except a comparator is designed specifically 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 either 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 analogue to digital (ADC). Two supply voltages 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
  • Micropower
  • Nano power
  • Precision
  • Push/pull output
  • Quad differential
  • Rail to rail
  • Voltage
  • Window

Mounting Types

Comparators can be found in both surface mount and through-hole mounting configurations to enable use in a wide variety of applications.

Comparator power supply types

Available in both single and dual power supply configurations, a comparator can easily be implemented into a robust solution.

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. 178-4707
Mfr. Part No.LM339NG
€0.496
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS Stock No. 774-3470
Mfr. Part No.LM2901NG
€0.312
Each (In a Pack of 10)
units
General Purpose Through Hole PDIP Dual, Single CMOS, TTL 4 1.3µs 14 36 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS Stock No. 787-8655
Mfr. Part No.LM393DMR2G
€0.229
Each (On a Tape of 20)
units
General Purpose Surface Mount MSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm -
RS Stock No. 689-9708
Mfr. Part No.LM239DR2G
€0.314
Each (In a Pack of 5)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS Stock No. 787-8816
Mfr. Part No.NCS2202SQ2T2G
€0.473
Each (On a Tape of 10)
units
Low Power Surface Mount SC-70 Single Open Drain 1 35µs 5 0.85 → 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB
RS Stock No. 185-9083
Mfr. Part No.NCS2252SN2T1G
€0.313
Each (In a Pack of 13)
units
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS Stock No. 787-8481
Mfr. Part No.NCS2220AMUT1G
€0.914
Each (On a Tape of 5)
units
Low Power Surface Mount UDFN Single Rail to Rail 2 - 8 0.85 → 6 V 1.6 x 1.6 x 0.5mm 1.6mm 1.6mm 0.5mm 70dB
RS Stock No. 802-1686
Mfr. Part No.NCS2200SQ2T2G
€0.165
Each (In a Pack of 20)
units
Low Power Surface Mount SC-70 Single Complementary 1 16ns 5 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB
RS Stock No. 787-8241
Mfr. Part No.LM2903DMR2G
€0.066
Each (In a Pack of 20)
units
General Purpose Surface Mount MSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm -
RS Stock No. 162-9566
Mfr. Part No.NCS2200SN2T1G
€0.24
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Single Complementary 1 35µs 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS Stock No. 163-2420
Mfr. Part No.LM393DR2G
€0.063
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 185-9057
Mfr. Part No.NCV2250SN2T1G
€0.372
Each (In a Pack of 13)
units
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS Stock No. 185-8101
Mfr. Part No.NCV2252SN2T1G
€0.125
Each (On a Reel of 3000)
units
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS Stock No. 162-9568
Mfr. Part No.NCS2202SQ2T2G
€0.198
Each (On a Reel of 3000)
units
Low Power Surface Mount SC-70 Single Open Drain 1 35µs 5 0.85 → 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB
RS Stock No. 805-1365
Mfr. Part No.LM311DR2G
€0.293
Each (On a Tape of 25)
units
General Purpose Surface Mount SOIC Dual, Single CMOS 1 200ns 8 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 162-9391
Mfr. Part No.MC3302DR2G
€0.176
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, TTL 4 1.3µs 14 3 → 30 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS Stock No. 145-4757
Mfr. Part No.LM393DMR2G
€0.077
Each (On a Reel of 4000)
units
General Purpose Surface Mount MSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm -
RS Stock No. 122-0108
Mfr. Part No.LM2903DR2G
€0.07
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 to 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 787-8611
Mfr. Part No.LM2903VDG
€0.111
Each (In a Pack of 14)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 787-8658
Mfr. Part No.LM339DTBR2G
€0.296
Each (On a Tape of 20)
units
General Purpose Surface Mount TSSOP Dual, Single CMOS, TTL 4 1.3µs 14 3 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -