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. 648-9459
Mfr. Part No.LP339N/NOPB
R 10.89
Each
units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 8µs 14 3 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS stock no. 428-458
Mfr. Part No.LM311P
R 9.36
Each
units
General Purpose Through Hole PDIP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS stock no. 145-6064
Mfr. Part No.TLV3202AIDGK
R 24.071
Each (In a Tube of 80)
units
Low Power Surface Mount MSOP Single Push-Pull 1 2.9ns 8 2.7 → 5.5 V 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 70dB
RS stock no. 168-8801
Mfr. Part No.TS881ILT
R 6.766
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Single Push-Pull 1 160ns 5 0.85 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 78dB
RS stock no. 545-4799
Mfr. Part No.LT1016CN8#PBF
R 117.72
Each
units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V 10.16 x 6.48 x 3.3mm 10.16mm 6.48mm 3.3mm 96dB
RS stock no. 162-4789
Mfr. Part No.LMV393MM/NOPB
R 7.592
Each (On a Reel of 1000)
units
General Purpose Surface Mount MSOP Single Open Collector 2 - 8 3 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm -
RS stock no. 738-7026
Mfr. Part No.MCP6561RT-E/OT
BrandMicrochip
R 8.564
Each (In a Pack of 5)
units
General Purpose Surface Mount SOT-23 Single Push-Pull 1 0.02µs 5 1.8 to 5.5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 65dB
RS stock no. 155-9289
Mfr. Part No.LT6703CDC-2#TRMPBF
R 21.493
Each (On a Reel of 500)
units
Low Power Surface Mount DFN Single Open Collector 1 2.2µs 3 1.4 → 18 V 2 x 2 x 0.7mm 2mm 2mm 0.7mm -
RS stock no. 759-1219
Mfr. Part No.AD790AQ
R 340.81
Each
units
High Speed Through Hole CDIP Dual, Single CMOS, TTL 1 0.04 → 0.045µs 8 5 V 10.29 x 7.67 x 3.56mm 10.29mm 7.67mm 3.56mm 95dB
RS stock no. 920-3475
Mfr. Part No.LM311D
R 7.387
Each (In a Tube of 75)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS stock no. 912-2994
Mfr. Part No.MCP6561RT-E/OT
BrandMicrochip
R 6.393
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Single Push-Pull 1 0.02µs 5 1.8 → 5.5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 65dB
RS stock no. 768-1369
Mfr. Part No.MCP6541UT-E/OT
BrandMicrochip
R 3.917
Each (In a Pack of 10)
units
General Purpose Surface Mount SOT-23 Single Push-Pull 1 - 5 1.6 → 5.5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 70dB
RS stock no. 761-9061
Mfr. Part No.LTC1540CMS8#PBF
R 69.92
Each
units
Low Power Surface Mount MSOP Dual, Single CMOS, TTL 1 - 8 2 → 11 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm 0.1mV/V
RS stock no. 528-157
Mfr. Part No.LM311DR
R 4.16
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS stock no. 669-6272
Mfr. Part No.MCP6564-E/SL
BrandMicrochip
R 23.83
Each (In a Pack of 5)
units
General Purpose Surface Mount SOIC Single Push-Pull 4 - 14 3 V, 5 V 8.65 x 3.9 x 1.25mm 8.65mm 3.9mm 1.25mm 66dB
RS stock no. 823-0206
Mfr. Part No.LT6703CDC-2#TRMPBF
R 33.218
Each (In a Pack of 5)
units
Low Power Surface Mount DFN Single Open Collector 1 2.2µs 3 1.4 → 18 V 2 x 2 x 0.7mm 2mm 2mm 0.7mm -
RS stock no. 534-4759
Mfr. Part No.LMV393MM/NOPB
R 15.80
Each
units
General Purpose Surface Mount MSOP Single Open Collector 2 - 8 3 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm -
RS stock no. 162-9568
Mfr. Part No.NCS2202SQ2T2G
R 4.132
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
RS stock no. 822-9937
Mfr. Part No.LT1721CS#PBF
R 173.00
Each
units
Low Power Surface Mount SOIC Single Rail to Rail, Swing 4 2.5ns 16 2.7 → 6 V 5.004 x 3.988 x 1.498mm 5mm 3.988mm 1.498mm 70dB
RS stock no. 146-0133
Mfr. Part No.MCP6564-E/SL
BrandMicrochip
R 19.919
Each (In a Tube of 57)
units
General Purpose Surface Mount SOIC Single Push-Pull 4 - 14 3 V, 5 V 8.65 x 3.9 x 1.25mm 8.65mm 3.9mm 1.25mm 66dB