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. 774-3470
Mfr. Part No.LM2901NG
MYR2.004
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. 162-9340
Mfr. Part No.LM211DR2G
MYR0.769
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 → 30 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 145-5313
Mfr. Part No.KA2803B
MYR2.264
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP - - - - 8 - 10.15 x 6.35 x 3.3mm 10.15mm 6.35mm 3.3mm -
RS Stock No. 170-3426
Mfr. Part No.LM293DR2G
MYR0.404
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. 787-8598
Mfr. Part No.LM211DR2G
MYR1.72
Each (On a Tape of 20)
units
General Purpose Surface Mount SOIC Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 → 30 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 166-1860
Mfr. Part No.LM2903N
MYR1.445
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 0.2 μs, 1.4 μs 8 2 → 36 V 9.6 x 6.4 x 3.4mm 9.6mm 6.4mm 3.4mm -
RS Stock No. 689-9714
Mfr. Part No.LM293DR2G
MYR2.35
Each (In a Pack of 5)
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. 671-0258
Mfr. Part No.KA2803B
MYR2.768
Each (In a Pack of 5)
units
General Purpose Through Hole PDIP - - - - 8 - 10.15 x 6.35 x 3.3mm 10.15mm 6.35mm 3.3mm -
RS Stock No. 163-2420
Mfr. Part No.LM393DR2G
MYR0.407
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. 802-4290
Mfr. Part No.NCS2200SN1T1G
MYR2.92
Each (In a Pack of 20)
units
Low Power Surface Mount SOT-23 Single Rail to Rail 1 - 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS Stock No. 689-9727
Mfr. Part No.LM393DR2G
MYR1.974
Each (In a Pack of 5)
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. 121-6493
Mfr. Part No.NCS2200SN1T1G
MYR1.805
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Single Rail to Rail 1 - 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS Stock No. 162-9391
Mfr. Part No.MC3302DR2G
MYR1.085
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. 163-2237
Mfr. Part No.NCS2200SQ2T2G
MYR1.326
Each (On a Reel of 3000)
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. 185-8100
Mfr. Part No.NCV2250SN2T1G
MYR1.121
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. 162-9345
Mfr. Part No.LM2903DMR2G
MYR0.515
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. 163-0189
Mfr. Part No.NCS2202AMUTBG
MYR0.65
Each (On a Reel of 3000)
units
Low Power Surface Mount UDFN Single Open Drain 1 - 6 0.85 → 6 V 1.2 x 1 x 0.5mm 1.2mm 1mm 0.5mm 80dB
RS Stock No. 185-9083
Mfr. Part No.NCS2252SN2T1G
MYR1.982
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. 185-9089
Mfr. Part No.NCV2252SN2T1G
MYR2.275
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. 787-8658
Mfr. Part No.LM339DTBR2G
MYR2.154
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 -