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. 828-7551
Mfr. Part No.AS393MTR-G1
SGD0.47
Each (In a Pack of 50)
units
Low Power Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 5.1 x 4 x 1.45mm 5.1mm 4mm 1.45mm -
RS Stock No. 170-8925
Mfr. Part No.AS393MTR-G1
SGD0.12
Each (On a Reel of 4000)
units
Low Power Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 5.1 x 4 x 1.45mm 5.1mm 4mm 1.45mm -
RS Stock No. 133-3358
Mfr. Part No.LM2901AQS14-13
SGD0.525
Each (In a Pack of 20)
units
Quad Differential Surface Mount SO Dual, Single CMOS, MOS, TTL 4 300ns 14 2 → 36 V 8.74 x 3.99 x 1.45mm 8.74mm 3.99mm 1.45mm -
RS Stock No. 168-9588
Mfr. Part No.LM2903M8-13
SGD0.154
Each (On a Reel of 2500)
units
Dual 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. 921-0739
Mfr. Part No.LMV331SE-7
SGD0.472
Each (In a Pack of 50)
units
General Purpose Surface Mount SOT-353 Single Open Collector 1 - 5 2.7 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS Stock No. 165-8321
Mfr. Part No.LMV331SE-7
SGD0.138
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-353 Single Open Collector 1 - 5 2.7 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS Stock No. 751-2998
Mfr. Part No.AP331AWG-7
SGD0.462
Each (In a Pack of 50)
units
General Purpose Surface Mount SOT-25 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS Stock No. 122-3374
Mfr. Part No.AS331KTR-G1
SGD0.135
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS Stock No. 828-7539
Mfr. Part No.AS331KTR-G1
SGD0.404
Each (In a Pack of 50)
units
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS Stock No. 168-9564
Mfr. Part No.LM2901AQS14-13
SGD0.201
Each (On a Reel of 2500)
units
Quad Differential Surface Mount SO Dual, Single CMOS, MOS, TTL 4 300ns 14 2 → 36 V 8.74 x 3.99 x 1.45mm 8.74mm 3.99mm 1.45mm -
RS Stock No. 165-8320
Mfr. Part No.LMV331W5-7
SGD0.148
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-25 Single Open Collector 1 - 5 2.7 → 5.5 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS Stock No. 751-2991
Mfr. Part No.AP331AWRG-7
SGD0.476
Each (In a Pack of 50)
units
General Purpose Surface Mount SOT-25R Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS Stock No. 165-8583
Mfr. Part No.AZV331KTR-G1
SGD0.156
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Single Open Collector 1 - 5 2.5 → 5.5 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS Stock No. 133-3372
Mfr. Part No.LM2903AQS-13
SGD0.498
Each (In a Pack of 50)
units
Dual Surface Mount SO Dual, Single CMOS, MOS, TTL 2 300ns 8 2 → 36 V 4.495 x 3.95 x 1.5mm 4.5mm 3.95mm 1.5mm -
RS Stock No. 121-9502
Mfr. Part No.AP331AWRG-7
SGD0.135
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-25R Dual, Single Open Collector 1 1.3µs 5 2 to 36 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS Stock No. 133-3381
Mfr. Part No.LM2903M8-13
SGD0.536
Each (In a Pack of 50)
units
Dual 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. 122-0368
Mfr. Part No.AP331AWG-7
SGD0.139
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-25 Dual, Single Open Collector 1 1.3µs 5 2 to 36 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS Stock No. 921-0732
Mfr. Part No.LMV331W5-7
SGD0.503
Each (In a Pack of 50)
units
General Purpose Surface Mount SOT-25 Single Open Collector 1 - 5 2.7 → 5.5 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS Stock No. 168-9580
Mfr. Part No.LM2903AQS-13
SGD0.147
Each (On a Reel of 2500)
units
Dual Surface Mount SO Dual, Single CMOS, MOS, TTL 2 300ns 8 2 → 36 V 4.495 x 3.95 x 1.5mm 4.5mm 3.95mm 1.5mm -
RS Stock No. 828-7624
Mfr. Part No.AZV331KTR-G1
SGD0.463
Each (In a Pack of 50)
units
Low Power Surface Mount SOT-23 Single Open Collector 1 - 5 2.5 → 5.5 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -