Comparators

A Comparator is a circuit which accepts two voltages or currents and then switches the output showing which is bigger. Comparators are found in components like analogue to digital converters. Comparators are like operational amplifiers except a comparator is designed 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 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

  • Surface mount
  • Through-hole

Comparator power supply types

  • Dual
  • Single

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. 178-7406
Mfr. Part No.LM2903PT
TWD3.60
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. 178-5160
Mfr. Part No.LM2903DT
TWD3.00
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. 795-8394
Mfr. Part No.LM2903PT
TWD10.70
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. 714-0754
Mfr. Part No.LM2903DT
TWD8.80
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. 428-458
Mfr. Part No.LM311P
TWD18.00
Each
units
General Purpose Through Hole PDIP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 121-8305
Mfr. Part No.LM311P
TWD10.50
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 528-343
Mfr. Part No.LM393DR
TWD9.20
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
TWD10.00
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. 779-8928
Mfr. Part No.LT1011ACN8#PBF
TWD212.00
Each (In a Pack of 2)
units
General Purpose Through Hole PDIP Dual CMOS, Open Collector, TTL 1 150ns 8 - 10.16 x 6.477 x 3.302mm 10.16mm 6.477mm 3.302mm 115dB
RS Stock No. 858-433
Mfr. Part No.LM393D
TWD14.00
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. 787-8611
Mfr. Part No.LM2903VDG
TWD14.10
Each (In a Pack of 14)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 460-566
Mfr. Part No.LM339AM/NOPB
TWD32.50
Each (In a Pack of 10)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 517-1882
Mfr. Part No.LM339AD
TWD10.60
Each (In a Pack of 20)
units
General Purpose 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. 144-9913
Mfr. Part No.LM339AD
TWD10.80
Each (In a Tube of 50)
units
General Purpose 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. 178-5167
Mfr. Part No.LM393DT
TWD2.70
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. 528-157
Mfr. Part No.LM311DR
TWD8.60
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 810-239
Mfr. Part No.LM393P
TWD12.00
Each
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 100-0750
Mfr. Part No.LM339D
TWD10.50
Each (In a Tube of 50)
units
General Purpose 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. 545-4799
Mfr. Part No.LT1016CN8#PBF
TWD264.00
Each
units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V 10.16 x 6.48 x 3.3mm 10.16mm 6.48mm 3.3mm 96dB
RS Stock No. 714-0833
Mfr. Part No.LM393DT
TWD10.40
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 -