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. 122-3374
Mfr. Part No.AS331KTR-G1
R 1.593
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS stock no. 828-7539
Mfr. Part No.AS331KTR-G1
R 2.588
Each (In a Pack of 50)
units
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS stock no. 165-8583
Mfr. Part No.AZV331KTR-G1
R 1.827
Each (On a Reel of 3000)
units
Low Voltage Surface Mount SOT-23 Single Open Collector 1 - 5 2.5 → 5.5 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS stock no. 146-0951
Mfr. Part No.LMV393S-13
R 1.612
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Single Open Collector 2 - 8 2.7 → 5.5 V - - - - -
RS stock no. 751-2991
Mfr. Part No.AP331AWRG-7
R 1.826
Each (In a Pack of 50)
units
General Purpose Surface Mount SOT-25R Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS stock no. 170-8921
Mfr. Part No.AS339MTR-G1
R 1.722
Each (On a Reel of 4000)
units
Low Power Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS stock no. 133-3372
Mfr. Part No.LM2903AQS-13
R 5.317
Each (In a Pack of 50)
units
Dual Differential Surface Mount SO Dual, Single CMOS, MOS, TTL 2 300ns 8 2 → 36 V 4.495 x 3.95 x 1.5mm 4.5mm 3.95mm 1.5mm -
RS stock no. 170-8925
Mfr. Part No.AS393MTR-G1
R 1.298
Each (On a Reel of 4000)
units
Low Power Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 5.1 x 4 x 1.45mm 5.1mm 4mm 1.45mm -
RS stock no. 921-0736
Mfr. Part No.LMV393S-13
R 1.632
Each (In a Pack of 50)
units
General Purpose Surface Mount SOIC Single Open Collector 2 - 8 2.7 → 5.5 V - - - - -
RS stock no. 121-9502
Mfr. Part No.AP331AWRG-7
R 1.645
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-25R Dual, Single Open Collector 1 1.3µs 5 2 to 36 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS stock no. 168-9580
Mfr. Part No.LM2903AQS-13
R 1.855
Each (On a Reel of 2500)
units
Dual Differential Surface Mount SO Dual, Single CMOS, MOS, TTL 2 300ns 8 2 → 36 V 4.495 x 3.95 x 1.5mm 4.5mm 3.95mm 1.5mm -
RS stock no. 828-7624
Mfr. Part No.AZV331KTR-G1
R 5.176
Each (In a Pack of 50)
units
Low Voltage Surface Mount SOT-23 Single Open Collector 1 - 5 2.5 → 5.5 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS stock no. 168-9588
Mfr. Part No.LM2903M8-13
R 1.722
Each (On a Reel of 2500)
units
Dual Differential Surface Mount MSOP Dual, Single CMOS, MOS, TTL 2 300ns 8 2 → 36 V 3.1 x 3.05 x 0.95mm 3.1mm 3.05mm 0.95mm -
RS stock no. 921-0732
Mfr. Part No.LMV331W5-7
R 5.608
Each (In a Pack of 50)
units
General Purpose Surface Mount SOT-25 Single Open Collector 1 - 5 2.7 → 5.5 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS stock no. 122-0368
Mfr. Part No.AP331AWG-7
R 1.733
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-25 Dual, Single Open Collector 1 1.3µs 5 2 to 36 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS stock no. 828-7533
Mfr. Part No.AS339MTR-G1
R 4.92
Each (In a Pack of 50)
units
Low Power Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS stock no. 921-0739
Mfr. Part No.LMV331SE-7
R 5.285
Each (In a Pack of 50)
units
General Purpose Surface Mount SOT-353 Single Open Collector 1 - 5 2.7 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS stock no. 133-3381
Mfr. Part No.LM2903M8-13
R 4.611
Each (In a Pack of 50)
units
Dual Differential Surface Mount MSOP Dual, Single CMOS, MOS, TTL 2 300ns 8 2 → 36 V 3.1 x 3.05 x 0.95mm 3.1mm 3.05mm 0.95mm -
RS stock no. 165-8320
Mfr. Part No.LMV331W5-7
R 1.691
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-25 Single Open Collector 1 - 5 2.7 → 5.5 V 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm -
RS stock no. 165-8321
Mfr. Part No.LMV331SE-7
R 1.586
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-353 Single Open Collector 1 - 5 2.7 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -