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. 810-239
Mfr. Part No.LM393P
$0.61
Each
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 866-0231
Mfr. Part No.LM393P
$0.635
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single CMOS, MOS, Open Collector, TTL 2 1.3µs 8 2 → 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 528-343
Mfr. Part No.LM393DR
$0.486
Each (In a Pack of 25)
units
General Purpose 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. 858-433
Mfr. Part No.LM393D
$0.67
Each
units
General Purpose 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. 100-0752
Mfr. Part No.LM393D
$0.498
Each (In a Tube of 75)
units
General Purpose 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. 179-1657
Mfr. Part No.LM211D
$1.132
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. 517-2352
Mfr. Part No.LM211D
$1.061
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. 858-411
Mfr. Part No.LM339D
$0.74
Each
units
General Purpose 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. 527-530
Mfr. Part No.LM211DR
$0.608
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. 100-0750
Mfr. Part No.LM339D
$0.555
Each (In a Tube of 50)
units
General Purpose 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. 533-8237
Mfr. Part No.LM339N/NOPB
$1.94
Each
units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 168-8973
Mfr. Part No.TS861ILT
$0.389
Each (On a Reel of 3000)
units
Dual Surface Mount SOT-23 Single Push-Pull 1 500ns 5 2.7 → 10 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 70dB
RS Stock No. 917-0760
Mfr. Part No.TS861ILT
$1.026
Each (In a Pack of 10)
units
Dual Surface Mount SOT-23 Single Push-Pull 1 500ns 5 2.7 → 10 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 70dB
RS Stock No. 121-8704
Mfr. Part No.LM339N/NOPB
$1.743
Each (In a Tube of 25)
units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 to 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 527-198
Mfr. Part No.LM339N
$0.525
Each (In a Pack of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 121-8421
Mfr. Part No.LM339N
$0.568
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 121-9350
Mfr. Part No.TPS3700DDCT
$1.827
Each (On a Reel of 250)
units
- Surface Mount TSOT-23 - - - - 6 - 3.05 x 1.75 x 1mm 3.05mm 1.75mm 1mm -
RS Stock No. 738-7026
Mfr. Part No.MCP6561RT-E/OT
BrandMicrochip
$0.766
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. 912-2994
Mfr. Part No.MCP6561RT-E/OT
BrandMicrochip
$0.582
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. 709-2043
Mfr. Part No.LM211P
$0.678
Each (In a Pack of 20)
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 -