Comparators

What is a Comparator?

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 analog to digital (ADC). Two supply voltage 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, Micro power, 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. 919-9364
Mfr. Part No.LT6703HVIS5-3#TRMPBF
R 23.486
Each (On a Reel of 500)
units
Low Voltage Surface Mount TSOT-23 Single Open Collector 1 - 5 1.4 → 18 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm -
RS stock no. 761-8908
Mfr. Part No.LT6703HVIS5-3#TRMPBF
R 57.73
Each
units
Low Voltage Surface Mount TSOT-23 Single Open Collector 1 - 5 1.4 → 18 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm -
RS stock no. 920-0066
Mfr. Part No.LT1711CMS8#PBF
R 49.674
Each (In a Tube of 50)
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. 822-5840
Mfr. Part No.LT1711CMS8#PBF
R 74.725
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. 155-9289
Mfr. Part No.LT6703CDC-2#TRMPBF
R 22.039
Each (On a Reel of 500)
units
Low Voltage Surface Mount DFN Single Open Collector 1 2.2µs 3 1.4 → 18 V 2 x 2 x 0.7mm 2mm 2mm 0.7mm -
RS stock no. 155-7722
Mfr. Part No.LT1721CS#PBF
R 116.657
Each (In a Tube of 50)
units
Low Power Surface Mount SOIC Single Rail to Rail, Swing 4 2.5ns 16 2.7 → 6 V 5.004 x 3.988 x 1.498mm 5mm 3.988mm 1.498mm 70dB
RS stock no. 761-9061
Mfr. Part No.LTC1540CMS8#PBF
R 73.08
Each
units
Low Power Surface Mount MSOP Dual, Single CMOS, TTL 1 - 8 2 → 11 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm 0.1mV/V
RS stock no. 145-6989
Mfr. Part No.LTC1540CMS8#PBF
R 41.914
Each (In a Tube of 50)
units
Low Power Surface Mount MSOP Dual, Single CMOS, TTL 1 - 8 2 → 11 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm 0.1mV/V
RS stock no. 823-0206
Mfr. Part No.LT6703CDC-2#TRMPBF
R 33.314
Each (In a Pack of 5)
units
Low Voltage Surface Mount DFN Single Open Collector 1 2.2µs 3 1.4 → 18 V 2 x 2 x 0.7mm 2mm 2mm 0.7mm -
RS stock no. 759-1219
Mfr. Part No.AD790AQ
R 338.73
Each
units
High Speed Through Hole CDIP Dual, Single CMOS, TTL 1 0.04 → 0.045µs 8 5 V 10.29 x 7.67 x 3.56mm 10.29mm 7.67mm 3.56mm 95dB
RS stock no. 822-9937
Mfr. Part No.LT1721CS#PBF
R 138.65
Each
units
Low Power Surface Mount SOIC Single Rail to Rail, Swing 4 2.5ns 16 2.7 → 6 V 5.004 x 3.988 x 1.498mm 5mm 3.988mm 1.498mm 70dB
RS stock no. 545-4799
Mfr. Part No.LT1016CN8#PBF
R 118.82
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. 153-3393
Mfr. Part No.LT1016CN8#PBF
R 67.23
Each (In a Tube of 50)
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. 912-7514
Mfr. Part No.AD8561ANZ
R 61.719
Each (In a Tube of 50)
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
RS stock no. 761-8377
Mfr. Part No.LT1715IMS#PBF
R 122.16
Each
units
High Speed Surface Mount MSOP Dual, Single CMOS, TTL 2 0.004µs 10 2.7 → 12 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm 70dB
RS stock no. 761-7933
Mfr. Part No.LT1016IS8#PBF
R 192.28
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. 523-8711
Mfr. Part No.AD8561ANZ
R 125.87
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
RS stock no. 919-9146
Mfr. Part No.LT1715IMSPBF
R 87.809
Each (In a Tube of 50)
units
High Speed Surface Mount MSOP Dual, Single CMOS, TTL 2 0.004µs 10 2.7 → 12 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm 70dB
RS stock no. 153-3559
Mfr. Part No.LT1011CN8#PBF
R 33.845
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 1 0.15µs 8 30 V 10.16 x 6.477 x 3.302mm 10.16mm 6.477mm 3.302mm 115dB
RS stock no. 155-7540
Mfr. Part No.LT1714IGN#PBF
R 88.364
Each (In a Tube of 100)
units
Low Power Surface Mount SSOP Dual, Single Rail to Rail 2 4ns 16 2.4 → 12 V 4.978 x 3.988 x 1.478mm 4.98mm 3.988mm 1.478mm 70dB