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. 795-9003
Mfr. Part No.TS3702IDT
MYR2.625
Each (In a Pack of 10)
units
Low Power Surface Mount SOIC Dual, Single CMOS, Push-Pull 2 2µs 8 2.7 → 16 V 5 x 4 x 1.65mm 5mm 4mm 1.65mm 82dB
RS Stock No. 168-7728
Mfr. Part No.TS3702IDT
MYR1.112
Each (On a Reel of 2500)
units
Low Power Surface Mount SOIC Dual, Single CMOS, Push-Pull 2 2µs 8 2.7 → 16 V 5 x 4 x 1.65mm 5mm 4mm 1.65mm 82dB
RS Stock No. 178-5167
Mfr. Part No.LM393DT
MYR0.381
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS Stock No. 714-0830
Mfr. Part No.LM393D
MYR0.591
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS Stock No. 714-0833
Mfr. Part No.LM393DT
MYR1.35
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS Stock No. 168-7454
Mfr. Part No.TS3022IDT
MYR4.899
Each (On a Reel of 2500)
units
High Speed Surface Mount SOIC Single Push-Pull 2 0.009µs 8 1.8 → 5 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm 67dB
RS Stock No. 145-9204
Mfr. Part No.LM339D
MYR0.429
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. 920-6361
Mfr. Part No.TS391ILT
MYR0.88
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 0.3µs 5 3 → 28 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm -
RS Stock No. 426-203
Mfr. Part No.TS391ILT
MYR2.289
Each (In a Pack of 10)
units
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 0.3µs 5 2 → 36 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm -
RS Stock No. 714-0815
Mfr. Part No.LM339DT
MYR1.197
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. 760-9468
Mfr. Part No.TS3022IDT
MYR6.09
Each (In a Pack of 5)
units
High Speed Surface Mount SOIC Single Push-Pull 2 0.009µs 8 1.8 → 5 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm 67dB
RS Stock No. 165-7717
Mfr. Part No.LM339DT
MYR0.403
Each (On a Reel of 2500)
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. 714-0811
Mfr. Part No.LM339D
MYR9.807
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. 178-5191
Mfr. Part No.LM211DT
MYR0.511
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. 145-8615
Mfr. Part No.LM339AD
MYR0.525
Each (In a Tube of 50)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -
RS Stock No. 168-6422
Mfr. Part No.TS393IDT
MYR1.387
Each (On a Reel of 2500)
units
Low Power Surface Mount SOIC Dual, Single Open Drain 2 2.5µs 8 3 → 15 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 71dB
RS Stock No. 426-118
Mfr. Part No.TS3021ICT
MYR4.74
Each (In a Pack of 5)
units
General Purpose Surface Mount SC-70 Single Push-Pull 1 0.04µs 5 3 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 79dB
RS Stock No. 795-6830
Mfr. Part No.TS393CDT
MYR2.405
Each (In a Pack of 10)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, Push-Pull 2 2.5µs 8 2.7 → 16 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 71dB
RS Stock No. 877-2740
Mfr. Part No.LM211DT
MYR1.586
Each (In a Pack of 20)
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. 168-8973
Mfr. Part No.TS861ILT
MYR1.219
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