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. 517-1810
Mfr. Part No.LM239D
R 5.349
Each (In a Pack of 20)
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. 179-2068
Mfr. Part No.LM239D
R 5.508
Each (In a Tube of 50)
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. 121-8772
Mfr. Part No.LM393N/NOPB
R 12.835
Each (In a Tube of 40)
units
General Purpose Through Hole MDIP Dual, Single Open Collector 2 1.3µs 8 3 to 28 V 9.27 x 6.35 x 3.3mm 9.27mm 6.35mm 3.3mm -
RS stock no. 100-0750
Mfr. Part No.LM339D
R 5.074
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. 166-1860
Mfr. Part No.LM2903N
R 9.772
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 0.2 μs, 1.4 μs 8 2 → 36 V 9.6 x 6.4 x 3.4mm 9.6mm 6.4mm 3.4mm -
RS stock no. 163-0189
Mfr. Part No.NCS2202AMUTBG
R 2.162
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. 920-9859
Mfr. Part No.NCS2202AMUTBG
R 6.616
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. 124-4530
Mfr. Part No.LM393N/NOPB
R 12.981
Each (In a Pack of 10)
units
Dual Through Hole PDIP Dual, Single Single Ended 1 1.3µs 8 2 → 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS stock no. 858-411
Mfr. Part No.LM339D
R 7.03
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. 165-4794
Mfr. Part No.MCP6562-E/SN
BrandMicrochip
R 9.017
Each (In a Tube of 100)
units
General Purpose Surface Mount SOIC Single Push-Pull 2 - 8 3 V, 5 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 66dB
RS stock no. 145-0121
Mfr. Part No.LP339N
R 9.23
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 8µs 14 5 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS stock no. 162-5376
Mfr. Part No.LM2903DGKR
R 1.977
Each (On a Reel of 2500)
units
Differential Surface Mount MSOP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 3 x 3 x 0.97mm 3mm 3mm 0.97mm -
RS stock no. 545-8151
Mfr. Part No.TLV3011AIDBVT
R 42.814
Each (In a Pack of 5)
units
Low Power Surface Mount SOT-23 Single Open Drain 1 - 6 3 V, 5 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm 74dB
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. 436-8417
Mfr. Part No.LM139J
R 210.99
Each
units
Differential Through Hole CDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.56 x 6.92 x 4.57mm 19.56mm 6.92mm 4.57mm -
RS stock no. 121-8305
Mfr. Part No.LM311P
R 6.651
Each (In a Tube of 50)
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. 661-2589
Mfr. Part No.LM2903DGKR
R 5.257
Each (In a Pack of 10)
units
Differential Surface Mount MSOP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 3 x 3 x 0.97mm 3mm 3mm 0.97mm -
RS stock no. 121-8933
Mfr. Part No.TLV3011AIDBVT
R 26.329
Each (On a Reel of 250)
units
Low Power Surface Mount SOT-23 Single Open Drain 1 - 6 3 V, 5 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm 74dB
RS stock no. 145-7092
Mfr. Part No.LM139J
R 173.004
Each (In a Tube of 25)
units
Differential Through Hole CDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.56 x 6.92 x 4.57mm 19.56mm 6.92mm 4.57mm -
RS stock no. 162-8170
Mfr. Part No.INA300AIDSQT
R 16.786
Each (On a Reel of 250)
units
Current Sense Surface Mount SON Single Open Drain 1 100µs 10 0 → 36 V 2.1 x 2.1 x 0.75mm 2.1mm 2.1mm 0.75mm 120dB