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. 805-1365
Mfr. Part No.LM311DR2G
HK$3.049
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. 145-5224
Mfr. Part No.LM311DR2G
HK$1.449
Each (On a Reel of 2500)
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. 178-4707
Mfr. Part No.LM339NG
HK$4.93
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. 166-1626
Mfr. Part No.FAN156L6X
HK$1.35
Each (On a Reel of 5000)
units
Low Power Surface Mount MicroPak Single Push-Pull 1 0.0054µs 6 5.5 V 1.45 x 1 x 0.5mm 1.45mm 1mm 0.5mm 60dB
RS Stock No. 145-3569
Mfr. Part No.LM2901VDTBR2G
HK$1.432
Each (On a Reel of 2500)
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 -
RS Stock No. 145-3570
Mfr. Part No.LM2903VDR2G
HK$1.04
Each (On a Reel of 2500)
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. 787-8655
Mfr. Part No.LM393DMR2G
HK$2.38
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. 787-8469
Mfr. Part No.NCS2202SN1T1G
HK$10.404
Each (On a Tape of 5)
units
Low Power Surface Mount SOT-23 Single Open Drain 1 35µs 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS Stock No. 787-8481
Mfr. Part No.NCS2220AMUT1G
HK$10.332
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. 163-0737
Mfr. Part No.NCV2200SN2T1G
HK$3.348
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Single Complementary 1 16ns 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
HK$1.844
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. 163-0189
Mfr. Part No.NCS2202AMUTBG
HK$1.46
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. 787-8807
Mfr. Part No.NCS2200SN2T1G
HK$6.108
Each (On a Tape of 10)
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. 689-9714
Mfr. Part No.LM293DR2G
HK$4.40
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. 162-9577
Mfr. Part No.NCV2903DR2G
HK$1.124
Each (On a Reel of 2500)
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. 145-3881
Mfr. Part No.LM2901DR2G
HK$1.176
Each (On a Reel of 2500)
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. 463-656
Mfr. Part No.LM2903DG
HK$3.256
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 145-4757
Mfr. Part No.LM393DMR2G
HK$0.802
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. 671-0258
Mfr. Part No.KA2803B
HK$5.284
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. 689-9718
Mfr. Part No.LM339DR2G
HK$4.264
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 -