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. 866-0219
Mfr. Part No.LM311N/NOPB
€0.795
Each (In a Tube of 40)
units
General Purpose Through Hole PDIP Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 124-4526
Mfr. Part No.LM311N/NOPB
€0.795
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. 178-4707
Mfr. Part No.LM339NG
€0.496
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS Stock No. 121-8421
Mfr. Part No.LM339N
€0.356
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. 533-8237
Mfr. Part No.LM339N/NOPB
€1.37
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. 527-198
Mfr. Part No.LM339N
€0.356
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. 121-8704
Mfr. Part No.LM339N/NOPB
€1.149
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. 858-433
Mfr. Part No.LM393D
€0.43
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. 522-9408
Mfr. Part No.AD790JNZ
€10.20
Each
units
General Purpose Through Hole PDIP Dual, Single TTL 1 - 8 5 V 9.27 x 7.24 x 3.43mm 9.27mm 7.24mm 3.43mm 95dB
RS Stock No. 528-343
Mfr. Part No.LM393DR
€0.28
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. 100-0752
Mfr. Part No.LM393D
€0.339
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. 121-9350
Mfr. Part No.TPS3700DDCT
€1.246
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. 876-7243
Mfr. Part No.MCP6546-I/P
BrandMicrochip
€0.322
Each (In a Tube of 60)
units
Low Power Through Hole PDIP Single Open Drain 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. 812-0449
Mfr. Part No.TPS3700DDCT
€1.77
Each (In a Pack of 10)
units
Window Surface Mount TSOT-23 Single Open Drain 2 2.2µs 6 1.8 → 18 V 3.05 x 1.75 x 1mm 3.05mm 1.75mm 1mm -
RS Stock No. 533-5749
Mfr. Part No.LM319N/NOPB
€2.26
Each
units
High Speed Through Hole MDIP Dual, Single Open Collector 2 0.08µs 14 9 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 402-885
Mfr. Part No.MCP6546-I/P
BrandMicrochip
€0.419
Each (In a Pack of 10)
units
Low Power Through Hole PDIP Single Open Drain 1 - 8 3 V, 5 V 9.27 x 6.35 x 3.3mm 9.27mm 6.35mm 3.3mm 70dB
RS Stock No. 714-0815
Mfr. Part No.LM339DT
€0.264
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. 649-497
Mfr. Part No.TLC3704CN
€1.56
Each
units
Low Power Through Hole PDIP Single Push-Pull 4 2.7µs 14 5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm 84dB
RS Stock No. 145-5720
Mfr. Part No.TLC3704CN
€1.318
Each (In a Tube of 25)
units
Low Power Through Hole PDIP Single Push-Pull 4 2.7µs 14 5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm 84dB
RS Stock No. 170-8925
Mfr. Part No.AS393MTR-G1
€0.079
Each (On a Reel of 4000)
units
Low Power Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 5.1 x 4 x 1.45mm 5.1mm 4mm 1.45mm -