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. 787-8816
Mfr. Part No.NCS2202SQ2T2G
R 9.056
Each (On a Tape of 10)
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. 527-738
Mfr. Part No.LM293DR
R 4.67
Each (In a Pack of 25)
units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS stock no. 517-2396
Mfr. Part No.LM311D
R 7.348
Each (In a Pack of 20)
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. 165-3327
Mfr. Part No.MCP6541UT-E/OT
BrandMicrochip
R 3.852
Each (On a Reel of 3000)
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. 661-2662
Mfr. Part No.TLC339CDR
R 22.862
Each (In a Pack of 5)
units
Low Power Surface Mount SOIC Single Open Drain 4 2.5µs 14 5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm 84dB
RS stock no. 860-7404
Mfr. Part No.TS881ILT
R 18.064
Each (In a Pack of 10)
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. 812-4047
Mfr. Part No.TLV3202AIDGK
R 24.066
Each (In a Pack of 10)
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. 714-0704
Mfr. Part No.LM211D
R 7.405
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS stock no. 170-2065
Mfr. Part No.LM211D
R 1.602
Each (In a Tube of 75)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS stock no. 145-9012
Mfr. Part No.MCP6542-E/P
BrandMicrochip
R 8.085
Each (In a Tube of 60)
units
General Purpose Through Hole PDIP Single Push-Pull 2 - 8 1.6 → 5.5 V 0.4 x 0.28 x 0.195in 10.16mm 0.28in 4.95mm 70dB
RS stock no. 536-1287
Mfr. Part No.LM311M/NOPB
R 25.01
Each
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS stock no. 866-0219
Mfr. Part No.LM311N/NOPB
R 12.034
Each (In a Tube of 40)
units
General Purpose Through Hole PDIP Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS stock no. 168-4869
Mfr. Part No.LM2901DR
R 1.528
Each (On a Reel of 2500)
units
Differential Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -
RS stock no. 761-8377
Mfr. Part No.LT1715IMS#PBF
R 151.83
Each
units
High Speed Surface Mount MSOP Dual, Single CMOS, TTL 2 0.004µs 10 2.7 → 12 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm 70dB
RS stock no. 178-5191
Mfr. Part No.LM211DT
R 1.86
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single TTL 1 200ns 8 5 V 5 x 4 x 1.65mm 5mm 4mm 1.65mm -
RS stock no. 121-8868
Mfr. Part No.LM311M/NOPB
R 20.75
Each (In a Tube of 95)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 to 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS stock no. 774-7532
Mfr. Part No.MCP6542-E/P
BrandMicrochip
R 9.568
Each (In a Bag of 10)
units
General Purpose Through Hole PDIP Single Push-Pull 2 - 8 1.6 to 5.5 V 0.4 x 0.28 x 0.195in 10.16mm 0.28in 4.95mm 70dB
RS stock no. 162-6240
Mfr. Part No.LM361M/NOPB
R 40.036
Each (In a Tube of 55)
units
High Speed Surface Mount SOIC Dual TTL 2 0.02µs 14 - 8.738 x 3.988 x 1.499mm 8.74mm 3.99mm 1.5mm -
RS stock no. 162-5401
Mfr. Part No.LMV393IDR
R 5.183
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Single Open Collector 2 - 8 3 V, 5 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS stock no. 528-365
Mfr. Part No.LM2901DR
R 5.007
Each (In a Pack of 25)
units
Differential Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -