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. 787-8611
Mfr. Part No.LM2903VDG
TWD14.10
Each (In a Pack of 14)
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. 787-8829
Mfr. Part No.NCV2903DR2G
TWD10.70
Each (On a Tape of 20)
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. 787-8658
Mfr. Part No.LM339DTBR2G
TWD11.90
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 -
RS Stock No. 689-9727
Mfr. Part No.LM393DR2G
TWD15.80
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
TWD3.30
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. 178-4707
Mfr. Part No.LM339NG
TWD19.60
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. 162-9353
Mfr. Part No.LM339DTBR2G
TWD4.50
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. 163-2420
Mfr. Part No.LM393DR2G
TWD3.40
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
TWD21.70
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. 162-9567
Mfr. Part No.NCS2202SN1T1G
TWD15.90
Each (On a Reel of 3000)
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. 145-3569
Mfr. Part No.LM2901VDTBR2G
TWD6.00
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. 185-9083
Mfr. Part No.NCS2252SN2T1G
TWD13.50
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. 162-9349
Mfr. Part No.LM293DMR2G
TWD4.10
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. 163-2416
Mfr. Part No.LM339DR2G
TWD3.20
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. 920-9859
Mfr. Part No.NCS2202AMUTBG
TWD14.60
Each (In a Pack of 5)
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. 787-8721
Mfr. Part No.MC3302DR2G
TWD16.90
Each (In a Pack of 10)
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. 787-8608
Mfr. Part No.LM239DTBR2G
TWD11.50
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 -
RS Stock No. 787-8605
Mfr. Part No.LM2901VDTBR2G
TWD14.70
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 -
RS Stock No. 689-9702
Mfr. Part No.LM2901DR2G
TWD12.60
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 -
RS Stock No. 162-9568
Mfr. Part No.NCS2202SQ2T2G
TWD7.80
Each (On a Reel of 3000)
units
Low Power Surface Mount SC-70 Single Open Drain 1 35µs 5 0.85 → 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB