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. 761-7933
Mfr. Part No.LT1016IS8#PBF
R 201.93
Each
units
High Speed Surface Mount SOIC Dual, Single TTL 1 0.01µs 8 5 V 5.004 x 3.988 x 1.498mm 5mm 3.988mm 1.498mm 96dB
RS stock no. 122-3374
Mfr. Part No.AS331KTR-G1
R 1.45
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS stock no. 738-7039
Mfr. Part No.MCP6564-E/ST
BrandMicrochip
R 24.10
Each (In a Pack of 2)
units
General Purpose Surface Mount TSSOP Single Push-Pull 4 0.02µs 14 1.8 to 5.5 V 5.1 x 4.5 x 1.05mm 5.1mm 4.50mm 1.05mm 65dB
RS stock no. 178-5160
Mfr. Part No.LM2903DT
R 1.498
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS stock no. 168-7141
Mfr. Part No.TS393CDT
R 3.033
Each (On a Reel of 2500)
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. 124-4526
Mfr. Part No.LM311N/NOPB
R 26.61
Each (In a Pack of 10)
units
Voltage Through Hole PDIP Single Single Ended 1 200ns 8 Maximum of 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS stock no. 402-790
Mfr. Part No.MCP6541-I/P
BrandMicrochip
R 7.789
Each (In a Pack of 10)
units
Low Power Through Hole PDIP Single Push-Pull 1 - 8 3 V, 5 V 9.27 x 6.35 x 3.3mm 9.27mm 6.35mm 3.3mm 70dB
RS stock no. 145-7305
Mfr. Part No.LM2901D
R 5.546
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. 661-2680
Mfr. Part No.TLC3704IDR
R 26.604
Each (In a Pack of 5)
units
Low Power Surface Mount SOIC Single Push-Pull 4 2.7µs 14 5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm 84dB
RS stock no. 162-5373
Mfr. Part No.LM2901N
R 6.74
Each (In a Tube of 25)
units
Differential 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. 463-656
Mfr. Part No.LM2903DG
R 4.986
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS stock no. 714-0754
Mfr. Part No.LM2903DT
R 4.474
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS stock no. 178-7406
Mfr. Part No.LM2903PT
R 1.029
Each (On a Reel of 4000)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm -
RS stock no. 828-7539
Mfr. Part No.AS331KTR-G1
R 4.296
Each (In a Pack of 50)
units
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS stock no. 795-8394
Mfr. Part No.LM2903PT
R 1.077
Each (On a Tape of 50)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm -
RS stock no. 761-5864
Mfr. Part No.LM361M/NOPB
R 45.588
Each (In a Pack of 5)
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. 162-5574
Mfr. Part No.TLC3704IDR
R 12.455
Each (On a Reel of 2500)
units
Low Power Surface Mount SOIC Single Push-Pull 4 2.7µs 14 5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm 84dB
RS stock no. 876-7186
Mfr. Part No.MCP6541-I/P
BrandMicrochip
R 6.385
Each (In a Tube of 60)
units
Low Power Through Hole PDIP Single Push-Pull 1 - 8 1.6 → 5.5 V 10.16 x 7.11 x 5.33mm 10.16mm 7.11mm 5.33mm 70dB
RS stock no. 713-9405
Mfr. Part No.NJM2903RB1-TE1
R 7.188
Each (In a Pack of 5)
units
General Purpose Surface Mount TVSP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 2.9 x 2.8 x 0.85mm 2.9mm 2.8mm 0.85mm -
RS stock no. 523-8711
Mfr. Part No.AD8561ANZ
R 100.30
Each
units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V, 9 V 9.27 x 7.24 x 3.43mm 9.27mm 7.24mm 3.43mm 85dB