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. 742-7711
Mfr. Part No.ADCMP371AKSZ-REEL7
kr 3,372
Each (In a Pack of 5)
Units
General Purpose Surface Mount SC-70 Single Push-Pull - 2 μs, 5 μs 5 2.25 to 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS Stock No. 822-5840
Mfr. Part No.LT1711CMS8#PBF
kr 48,485
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. 527-198
Mfr. Part No.LM339N
kr 3,222
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. 178-5167
Mfr. Part No.LM393DT
kr 0,643
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. 159-7680
Mfr. Part No.ADCMP573BCPZ-R2
kr 143,909
Each (On a Reel of 250)
Units
High Speed Surface Mount LFCSP VQ Single RSPECL 1 0.000165µs 16 3.3 → 5.2 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 121-8421
Mfr. Part No.LM339N
kr 3,222
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. 121-8704
Mfr. Part No.LM339N/NOPB
kr 8,602
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. 880-5490
Mfr. Part No.TS391IYLT
kr 6,903
Each (In a Pack of 10)
Units
General Purpose Surface Mount SOT-23 Dual, Single CMOS, DTL, ECL, TTL 1 1.3 ns/μs, 300 ns/μs 5 ±2 → ±36 V 1.75 x 3 x 1.3mm 1.75mm 3mm 1.3mm -
New
RS Stock No. 208-8598
Mfr. Part No.LM393DGKR
kr 0,935
Each (On a Reel of 2500)
Units
- Surface Mount SOIC Dual - 2 1.3µs 8 20 → 30 V - - - - -
RS Stock No. 191-4724
Mfr. Part No.MAX9600EUP+
kr 85,34
Each
Units
High Speed Surface Mount TSSOP Single Differential 2 - 20 +5 V 6.6 x 4.5 x 0.95mm 6.6mm 4.5mm 0.95mm 70dB
New
RS Stock No. 208-8599
Mfr. Part No.LM393DGKR
kr 3,00
Each (In a Pack of 25)
Units
- Surface Mount SOIC Dual - 2 1.3µs 8 20 → 30 V - - - - -
New
RS Stock No. 216-7807
Mfr. Part No.MAX40027ATC/VY+T
kr 58,551
Each (On a Reel of 2500)
Units
High Speed Surface Mount DFN Single LVDS 2 - 12 2.7 → 3.6 V - - - - -
RS Stock No. 709-2393
Mfr. Part No.LP311P
kr 11,475
Each (In a Pack of 10)
Units
General Purpose Through Hole PDIP Dual, Single Open Collector/Emitter 1 1.2µs 8 5 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 189-1916
Mfr. Part No.LM2901YDT
kr 3,20
Each (In a Pack of 25)
Units
Low Power Surface Mount SO Dual, Single CMOS, DTL, ECL, MOS, TTL 4 1.3µs 14 2 → 32 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 185-9089
Mfr. Part No.NCV2252SN2T1G
kr 1,343
Each (In a Pack of 13)
Units
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS Stock No. 812-4047
Mfr. Part No.TLV3202AIDGK
kr 13,752
Each (In a Pack of 10)
Units
Low Power Surface Mount MSOP Single Push-Pull 1 2.9ns 8 2.7 → 5.5 V 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 70dB
RS Stock No. 165-8321
Mfr. Part No.LMV331SE-7
kr 0,856
Each (On a Reel of 3000)
Units
General Purpose Surface Mount SOT-353 Single Open Collector 1 - 5 2.7 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS Stock No. 145-5224
Mfr. Part No.LM311DR2G
kr 1,231
Each (On a Reel of 2500)
Units
General Purpose Surface Mount SOIC Dual, Single CMOS 1 200ns 8 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 165-7437
Mfr. Part No.LM2901PT
kr 0,989
Each (On a Reel of 2500)
Units
General Purpose Surface Mount TSSOP 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. 189-7346
Mfr. Part No.MAX922CSA+
kr 22,942
Each (In a Tube of 100)
Units
Low Power Surface Mount SOIC Dual, Single CMOS, TTL 1 12µs 8 2.5 → 11 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 1mV/V