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. 760-9443
Mfr. Part No.TS3011ILT
R 42.708
Each (In a Pack of 5)
units
High Speed Surface Mount SOT-23 Single Push-Pull 1 8ns 5 2.2 → 5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 74dB
RS stock no. 165-6615
Mfr. Part No.TS3011ILT
R 20.648
Each (On a Reel of 3000)
units
High Speed Surface Mount SOT-23 Single Push-Pull 1 8ns 5 2.2 → 5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 74dB
RS stock no. 714-0714
Mfr. Part No.LM239D
R 7.841
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS stock no. 686-7519
Mfr. Part No.LM239DT
R 4.382
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS stock no. 168-6423
Mfr. Part No.LM239DT
R 1.357
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS stock no. 100-0752
Mfr. Part No.LM393D
R 5.108
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. 145-9203
Mfr. Part No.LM239D
R 5.353
Each (In a Tube of 50)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS stock no. 858-433
Mfr. Part No.LM393D
R 7.03
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. 919-9364
Mfr. Part No.LT6703HVIS5-3#TRMPBF
R 24.597
Each (On a Reel of 500)
units
Low Power Surface Mount TSOT-23 Single Open Collector 1 - 5 1.4 → 18 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm -
RS stock no. 761-8908
Mfr. Part No.LT6703HVIS5-3#TRMPBF
R 38.63
Each
units
Low Power Surface Mount TSOT-23 Single Open Collector 1 - 5 1.4 → 18 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm -
RS stock no. 528-343
Mfr. Part No.LM393DR
R 3.62
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. 121-8421
Mfr. Part No.LM339N
R 5.752
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. 822-5840
Mfr. Part No.LT1711CMS8#PBF
R 86.61
Each (In a Pack of 2)
units
High Speed Surface Mount MSOP Dual, Single Rail to Rail 1 2ns 8 2.4 → 12 V 3 x 3 x 1.095mm 3mm 3mm 1.095mm 75dB
RS stock no. 528-353
Mfr. Part No.LM2903DR
R 4.474
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. 527-198
Mfr. Part No.LM339N
R 7.165
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. 517-2374
Mfr. Part No.LM2903D
R 5.478
Each (In a Pack of 20)
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. 121-8671
Mfr. Part No.LM2903D
R 5.575
Each (In a Tube of 75)
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. 533-8237
Mfr. Part No.LM339N/NOPB
R 20.32
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. 121-8704
Mfr. Part No.LM339N/NOPB
R 17.02
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. 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