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. 714-0764
Mfr. Part No.LM293D
$0.253
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 1.58mm 4.9mm 3.9mm 1.58mm -
RS Stock No. 178-5167
Mfr. Part No.LM393DT
$0.16
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
$0.198
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. 714-0773
Mfr. Part No.LM293DT
$0.444
Each (In a Pack of 20)
units
Low Power 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. 145-9606
Mfr. Part No.LM293DT
$0.17
Each (On a Reel of 2500)
units
Low Power 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
$0.419
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. 168-6807
Mfr. Part No.LM293D
$0.30
Each (In a Tube of 100)
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 1.58mm 4.9mm 3.9mm 1.58mm -
RS Stock No. 714-0754
Mfr. Part No.LM2903DT
$0.451
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. 189-2043
Mfr. Part No.TS334IPT
$1.49
Each (In a Pack of 10)
units
Low Power Surface Mount TSSOP Single Open Drain 4 - 14 1.6 → 5 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm 79dB
RS Stock No. 714-0770
Mfr. Part No.LM311D
$0.496
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS Stock No. 791-8021
Mfr. Part No.TS334IYDT
$1.839
Each (In a Pack of 10)
units
Low Power Surface Mount SOIC Dual, Single Open Drain 4 - 14 5.5 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm 79dB
RS Stock No. 189-1850
Mfr. Part No.LM2902YPT
$676.62
1 Reel of 2500
Reel(s)
Low Power Surface Mount TSSOP Dual, Single - 4 - 14 3 → 30 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
RS Stock No. 880-5336
Mfr. Part No.LM219DT
$1.263
Each (In a Pack of 10)
units
General Purpose Surface Mount SOIC Single Open Collector, TTL 2 80ns 14 ±5 → ±15 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 860-7407
Mfr. Part No.TSX3702IDT
$1.393
Each (In a Pack of 10)
units
Low Power Surface Mount SOIC Dual, Single Push-Pull 2 2.4µs 8 2.7 → 16 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 90dB
RS Stock No. 189-1853
Mfr. Part No.LM2904YST
$1,138.20
1 Reel of 4000
Reel(s)
Low Power Surface Mount MiniSO Single Swing 2 - 8 3 → 30 V 3.2 x 3.1 x 0.95mm 3.2mm 3.1mm 0.95mm -
RS Stock No. 178-7406
Mfr. Part No.LM2903PT
$0.209
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. 145-8615
Mfr. Part No.LM339AD
$0.173
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. 920-6355
Mfr. Part No.LM319DT
$0.466
Each (On a Reel of 2500)
units
High Speed Surface Mount SOIC Single TTL 2 80ns 14 5 → ±15 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 917-0760
Mfr. Part No.TS861ILT
$1.102
Each (In a Pack of 10)
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
RS Stock No. 795-8458
Mfr. Part No.LM339PT
$0.491
Each (On a Tape of 25)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -