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. 190-4360
Mfr. Part No.MAX9075EXK+T
SGD2.095
Each (On a Reel of 2500)
units
Low Power Surface Mount SC-70 Single Rail to Rail 1 - 5 2.1 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 82dB
RS Stock No. 191-4703
Mfr. Part No.MAX9202ESD+
SGD7.20
Each (In a Pack of 5)
units
Low Power Surface Mount SOIC Dual, Single TTL 2 7ns 14 +5 → +10 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm 50dB
RS Stock No. 191-4003
Mfr. Part No.MAX921EPA+
SGD7.188
Each (In a Tube of 50)
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
RS Stock No. 192-2413
Mfr. Part No.MAX995ESD+
SGD6.03
Each (In a Pack of 5)
units
Low Power Surface Mount SOIC Dual, Single Push-Pull 4 0.04µs 14 2.5 → 5.5 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm 80dB
RS Stock No. 191-4678
Mfr. Part No.MAX9034AUD+
SGD1.98
Each (In a Pack of 10)
units
Dual Surface Mount TSSOP Single Rail to Rail 4 - 14 +2.5 → +5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm 0.95mm 100dB
RS Stock No. 190-4383
Mfr. Part No.MAX989EUA+
SGD3.11
Each (In a Tube of 50)
units
Micro Power Comparator Surface Mount μMAX Dual, Single Push-Pull 1 - 8 2.5 → 5.5 V 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 80dB
RS Stock No. 191-3226
Mfr. Part No.MAX903ESA+
SGD11.411
Each (In a Tube of 100)
units
Low Power Surface Mount SO Dual, Single TTL 1 10ns 8 5 → 10 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 75µV/V
RS Stock No. 191-4308
Mfr. Part No.MAX9600EUP+
SGD14.385
Each (In a Tube of 74)
units
High Speed Surface Mount TSSOP Single Differential 2 - 20 +5 V 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 70dB
RS Stock No. 189-7334
Mfr. Part No.MAX913ESA+
SGD7.475
Each (In a Tube of 100)
units
Low Power Surface Mount SOIC Dual, Single Complementary 1 - 8 5 → 10 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 110dB
RS Stock No. 540-4407
Mfr. Part No.MAX961ESA+
SGD7.42
Each
units
General Purpose Surface Mount SOIC Single Complementary 1 - 8 3 V, 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 80dB
RS Stock No. 190-6652
Mfr. Part No.MAX987ESA+
SGD2.304
Each (In a Pack of 10)
units
High Speed, Micro Power Comparator Surface Mount SO Dual, Single Push-Pull 1 - 8 2.5 → 5.5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 80dB
RS Stock No. 169-8412
Mfr. Part No.MAX9142ESA+
SGD2.83
Each (In a Tube of 100)
units
Low Power Surface Mount SOIC Single Push-Pull 2 - 8 2.7 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 80µV/V
RS Stock No. 190-6631
Mfr. Part No.MAX9142EKA+T
SGD4.284
Each (In a Pack of 5)
units
Low Power Surface Mount SOT-23 Single - 2 - 8 2.7 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 80µV/V
RS Stock No. 190-6613
Mfr. Part No.MAX9030AUT+T
SGD0.916
Each (In a Pack of 10)
units
Low Power, Micro Power Comparator Surface Mount SOT-23 Single Rail to Rail - - 6 2.5 → 5.5 V 3 x 1.75 x 1.3mm 3mm 3mm 1.3mm 100dB
RS Stock No. 190-6556
Mfr. Part No.MAX9064EBS+TG45
SGD1.21
Each (In a Pack of 10)
units
Nano Power Surface Mount UCSP Single Open Drain, Push-Pull 1 - 4 1 → 5.5 V 1 x 1 x 0.4mm 1mm 1mm 0.4mm -
RS Stock No. 190-6413
Mfr. Part No.MAX921CSA+
SGD6.68
Each (In a Pack of 5)
units
- Surface Mount SO Dual, Single - 1 14µs 8 2.5 → 11 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 0.2mV/V
RS Stock No. 191-3409
Mfr. Part No.MAX992ESA+
SGD3.73
Each (In a Pack of 5)
units
High Speed, Micro Power Comparator Surface Mount SO Dual, Single Open Drain 1 - 8 2.5 → 5.5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 80dB
RS Stock No. 191-3332
Mfr. Part No.MAX920EUK+T
SGD1.328
Each (On a Reel of 2500)
units
Nano Power Surface Mount SOT-23 Single Open Drain 1 - 5 1.8 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 0.5mV/V
RS Stock No. 192-2428
Mfr. Part No.MAX913EPA+
SGD13.07
Each
units
Low Power Through Hole PDIP Single Push-Pull 1 - 8 5 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 110dB
RS Stock No. 190-4365
Mfr. Part No.MAX9144EUD+
SGD4.218
Each (In a Tube of 96)
units
Low Power Surface Mount TSSOP Single - 4 - 14 2.7 → 5.5 V 5.1 x 4.5 x 0.95mm 5.1mm 4.5mm 0.95mm 80µV/V