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. 858-0627
Mfr. Part No.LTC1042CN8#PBF
kr 38,768
Each (In a Pack of 5)
Units
General Purpose Through Hole PDIP Single TTL - 80µs 8 18 V 10.16 x 6.47 x 3.3mm 10.16mm 6.47mm 3.3mm -
RS Stock No. 866-0219
Mfr. Part No.LM311N/NOPB
kr 7,202
Each (In a Tube of 40)
Units
General Purpose Through Hole PDIP Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 145-8957
Mfr. Part No.MCP6541-E/SN
BrandMicrochip
kr 2,655
Each (In a Tube of 100)
Units
Low Power Surface Mount SOIC Single Push-Pull 1 - 8 3 V, 5 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 70dB
RS Stock No. 124-4526
Mfr. Part No.LM311N/NOPB
kr 7,208
Each (In a Pack of 10)
Units
Voltage Through Hole PDIP Single Single Ended 1 200ns 8 Maximum of 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 917-3523
Mfr. Part No.LT1716CS5#TRMPBF
kr 14,498
Each (On a Reel of 500)
Units
General Purpose Surface Mount TSOT-23 Dual, Single Open Collector 1 - 5 3 → 28 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm 110dB
RS Stock No. 506-0372
Mfr. Part No.LT1716CS5#TRMPBF
kr 23,048
Each (In a Pack of 5)
Units
General Purpose Surface Mount TSOT-23 Dual, Single Open Collector 1 - 5 3 → 28 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm 110dB
RS Stock No. 669-6200
Mfr. Part No.MCP6541-E/SN
BrandMicrochip
kr 4,142
Each (In a Pack of 10)
Units
Low Power Surface Mount SOIC Single Push-Pull 1 - 8 3 V, 5 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 70dB
RS Stock No. 742-7711
Mfr. Part No.ADCMP371AKSZ-REEL7
kr 3,372
Each (In a Pack of 5)
Units
General Purpose Surface Mount SC-70 Single Push-Pull - 2 μs, 5 μs 5 2.25 to 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS Stock No. 121-8704
Mfr. Part No.LM339N/NOPB
kr 8,602
Each (In a Tube of 25)
Units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 to 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 714-0833
Mfr. Part No.LM393DT
kr 3,289
Each (In a Pack of 20)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS Stock No. 121-8421
Mfr. Part No.LM339N
kr 3,222
Each (In a Tube of 25)
Units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 402-885
Mfr. Part No.MCP6546-I/P
BrandMicrochip
kr 4,555
Each (In a Pack of 10)
Units
Low Power Through Hole PDIP Single Open Drain 1 - 8 3 V, 5 V 9.27 x 6.35 x 3.3mm 9.27mm 6.35mm 3.3mm 70dB
RS Stock No. 159-7680
Mfr. Part No.ADCMP573BCPZ-R2
kr 143,909
Each (On a Reel of 250)
Units
High Speed Surface Mount LFCSP VQ Single RSPECL 1 0.000165µs 16 3.3 → 5.2 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 527-198
Mfr. Part No.LM339N
kr 3,222
Each (In a Pack of 25)
Units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 822-5840
Mfr. Part No.LT1711CMS8#PBF
kr 48,485
Each (In a Pack of 2)
Units
High Speed Surface Mount MSOP Dual, Single Rail to Rail 1 2ns 8 2.4 → 12 V 3 x 3 x 1.095mm 3mm 3mm 1.095mm 75dB
RS Stock No. 145-6784
Mfr. Part No.ADCMP371AKSZ-REEL7
kr 3,147
Each (On a Reel of 3000)
Units
General Purpose Surface Mount SC-70 Single Push-Pull - 2 μs, 5 μs 5 2.25 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS Stock No. 178-5167
Mfr. Part No.LM393DT
kr 0,643
Each (On a Reel of 2500)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS Stock No. 759-1553
Mfr. Part No.ADCMP573BCPZ-R2
kr 174,59
Each
Units
High Speed Surface Mount LFCSP VQ Single RSPECL 1 0.000165µs 16 3.3 → 5.2 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 522-9408
Mfr. Part No.AD790JNZ
kr 110,89
Each
Units
General Purpose Through Hole PDIP Dual, Single TTL 1 - 8 5 V 9.27 x 7.24 x 3.43mm 9.27mm 7.24mm 3.43mm 95dB
RS Stock No. 533-8237
Mfr. Part No.LM339N/NOPB
kr 12,07
Each
Units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -