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. 709-7073
Mfr. Part No.AD8214ARMZ
$2.02
Each
units
High Voltage Surface Mount MSOP Single - - - 8 5 → 65 V 3 x 3 x 0.85mm 3mm 3mm 0.85mm -
RS Stock No. 159-7871
Mfr. Part No.AD8214ARMZ
$2.004
Each (In a Tube of 50)
units
High Voltage Surface Mount MSOP Single - - - 8 5 → 65 V 3 x 3 x 0.85mm 3mm 3mm 0.85mm -
RS Stock No. 806-8054
Mfr. Part No.AD8611ARMZ-R2
$7.75
Each
units
High Speed Surface Mount MSOP Single Complementary 1 2.5ns 8 3 → 5 V 3.2 x 3.2 x 0.95mm 3.2mm 3.2mm 0.95mm 85dB
RS Stock No. 160-1749
Mfr. Part No.AD8611ARMZ-R2
$6.143
Each (On a Reel of 250)
units
High Speed Surface Mount MSOP Single Complementary 1 2.5ns 8 3 → 5 V 3.2 x 3.2 x 0.95mm 3.2mm 3.2mm 0.95mm 85dB
RS Stock No. 912-8974
Mfr. Part No.AD8611ARZ
$5.51
Each (In a Tube of 98)
units
General Purpose Surface Mount SOIC Single Complementary 1 - 8 - 5 x 4 x 1.5mm 5mm 4mm 1.5mm 85dB
RS Stock No. 145-6784
Mfr. Part No.ADCMP371AKSZ-REEL7
$0.657
Each (On a Reel of 3000)
units
General Purpose Surface Mount SC-70 Single Push-Pull - 2 μs, 5 μs 5 2.25 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS Stock No. 497-3716
Mfr. Part No.AD8611ARZ
$6.74
Each
units
General Purpose Surface Mount SOIC Single Complementary 1 - 8 - 5 x 4 x 1.5mm 5mm 4mm 1.5mm 85dB
RS Stock No. 742-7711
Mfr. Part No.ADCMP371AKSZ-REEL7
$1.306
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. 523-8711
Mfr. Part No.AD8561ANZ
$8.14
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. 759-0241
Mfr. Part No.ADCMP604BKSZ-R2
$8.23
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. 810-0035
Mfr. Part No.ADCMP356YKSZ-REEL7
$1.221
Each (On a Tape of 10)
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 -
RS Stock No. 145-0963
Mfr. Part No.ADCMP393ARZ
$1.344
Each (In a Tube of 56)
units
Low Power Surface Mount SOIC Single Open Drain 4 0.15 (Fall Time) μs, 1.1 (Rise Time) μs 14 2.3 → 5.5 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm 74dB
RS Stock No. 759-1556
Mfr. Part No.ADCMP608BKSZ-REEL7
$2.304
Each (In a Pack of 5)
units
High Speed Surface Mount SC-70 Single CMOS, TTL 1 0.035 → 0.06µs 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 45dB
RS Stock No. 759-1553
Mfr. Part No.ADCMP573BCPZ-R2
$23.54
Each
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. 160-2626
Mfr. Part No.ADCMP350YKSZ-REEL7
$0.841
Each (On a Reel of 3000)
units
General Purpose Surface Mount SC-70 Single Open Drain 1 30 ns, 45 ns 4 2.25 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS Stock No. 158-0165
Mfr. Part No.ADCMP563BRQZ
$6.591
Each (In a Tube of 98)
units
General Purpose Surface Mount QSOP Dual Complementary 2 - 16 - 5 x 3.91 x 1.65mm 5mm 3.91mm 1.65mm 80dB
RS Stock No. 709-7385
Mfr. Part No.AD96687BPZ
$10.24
Each
units
General Purpose Surface Mount PLCC Dual Complementary 2 - 20 - 9.04 x 9.04 x 3.68mm 9.04mm 9.04mm 3.68mm 90dB
RS Stock No. 709-5339
Mfr. Part No.CMP04FSZ
$16.99
Each
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm 100dB
RS Stock No. 831-9084
Mfr. Part No.ADCMP393ARZ
$1.139
Each (In a Pack of 10)
units
Low Power Surface Mount SOIC Single Open Drain 4 0.15 (Fall Time) μs, 1.1 (Rise Time) μs 14 2.3 → 5.5 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm 74dB
RS Stock No. 759-1219
Mfr. Part No.AD790AQ
$23.07
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