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. 779-9252
Mfr. Part No.LT1394CS8#PBF
HK$39.865
Each (In a Pack of 2)
units
High Speed Surface Mount SOIC Dual, Single CMOS, TTL 1 - 8 5 V 5.004 x 3.89 x 1.498mm 5mm 3.89mm 1.498mm 100dB
RS Stock No. 545-4799
Mfr. Part No.LT1016CN8#PBF
HK$57.14
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. 177-7297
Mfr. Part No.LT1394CS8#PBF
HK$44.789
Each (In a Tube of 100)
units
High Speed Surface Mount SOIC Dual, Single CMOS, TTL 1 - 8 5 V 5.004 x 3.89 x 1.498mm 5mm 3.89mm 1.498mm 100dB
RS Stock No. 153-3393
Mfr. Part No.LT1016CN8#PBF
HK$38.162
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. 159-8141
Mfr. Part No.ADCMP604BKSZ-R2
HK$37.91
Each (On a Reel of 250)
units
High Speed Surface Mount SC-70 Single LVDS 1 0.003µs 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 50dB
RS Stock No. 759-0241
Mfr. Part No.ADCMP604BKSZ-R2
HK$46.09
Each
units
High Speed Surface Mount SC-70 Single LVDS 1 0.003µs 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 50dB
RS Stock No. 160-3349
Mfr. Part No.AD8468WBKSZ-R7
HK$11.315
Each (On a Reel of 3000)
units
Low Power Surface Mount SC-70 Single CMOS, Rail to Rail, TTL 1 45ns 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 45dB
RS Stock No. 912-7031
Mfr. Part No.AD790JRZ
HK$54.759
Each (In a Tube of 98)
units
General Purpose Surface Mount SOIC Dual, Single TTL 1 - 8 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 95dB
RS Stock No. 809-9253
Mfr. Part No.AD8468WBKSZ-R7
HK$15.468
Each (On a Tape of 5)
units
Low Power Surface Mount SC-70 Single CMOS, Rail to Rail, TTL 1 45ns 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 45dB
RS Stock No. 145-6170
Mfr. Part No.LT1016CS8#PBF
HK$41.084
Each (In a Tube of 100)
units
General Purpose Surface Mount SOIC Dual, Single Complementary 1 - 8 5 V 5 x 3.99 x 1.48mm 5mm 3.99mm 1.48mm 96dB
RS Stock No. 545-5174
Mfr. Part No.LT1016CS8#PBF
HK$52.24
Each
units
General Purpose Surface Mount SOIC Dual, Single Complementary 1 - 8 5 V 5 x 3.99 x 1.48mm 5mm 3.99mm 1.48mm 96dB
RS Stock No. 195-082
Mfr. Part No.AD790JRZ
HK$70.36
Each
units
General Purpose Surface Mount SOIC Dual, Single TTL 1 - 8 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 95dB
RS Stock No. 151-3100
Mfr. Part No.LTC6752ISC6-1#TRMPBF
HK$22.57
Each (On a Reel of 500)
units
High Speed Surface Mount SC-70 Single CMOS 1 - 6 Maximum of 3.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 70dB
RS Stock No. 160-2624
Mfr. Part No.ADCMP343YRJZ-REEL7
HK$13.249
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Single Open Drain 2 0.07 μs, 0.5 μs 8 1.7 → 5.5 V 3 x 1.7 x 1.3mm 3mm 1.7mm 1.3mm -
RS Stock No. 160-2753
Mfr. Part No.ADCMP391ARZ
HK$4.279
Each (In a Tube of 98)
units
General Purpose Surface Mount SOIC Single Open Drain 1 1.1µs 8 2.3 → 5.5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 74dB
RS Stock No. 177-7138
Mfr. Part No.AD8564ARZ
HK$60.84
Each (In a Tube of 48)
units
General Purpose Surface Mount SOIC Dual, Single - 4 - 16 5 V 10 x 4 x 1.5mm 10mm 4mm 1.5mm 85dB
RS Stock No. 742-7711
Mfr. Part No.ADCMP371AKSZ-REEL7
HK$6.23
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. 145-6587
Mfr. Part No.ADCMP552BRQZ
HK$42.997
Each (In a Tube of 56)
units
General Purpose Surface Mount QSOP Single Complementary 1 - 20 3.3 V 8.66 x 3.91 x 1.65mm 8.66mm 3.91mm 1.65mm 76dB
RS Stock No. 912-6479
Mfr. Part No.ADCMP580BCPZ-WP
HK$131.437
Each (In a Tray of 50)
units
General Purpose Surface Mount LFCSP Dual Complementary 1 - 16 - 3 x 3 x 0.83mm 3mm 3mm 0.83mm 60dB
RS Stock No. 160-2625
Mfr. Part No.ADCMP356YKSZ-REEL7
HK$3.946
Each (On a Reel of 3000)
units
General Purpose Surface Mount SC-70 Single Push-Pull 1 30 ns, 45 ns 4 2.25 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -