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. 912-8021
Mfr. Part No.AD96687BRZ
SGD8.96
Each (In a Tube of 48)
units
General Purpose Surface Mount SOIC Dual Complementary 2 - 16 - 10 x 4 x 1.5mm 10mm 4mm 1.5mm 90dB
RS Stock No. 121-8421
Mfr. Part No.LM339N
SGD0.506
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 165-9115
Mfr. Part No.MAX961ESA+
BrandMaxim
SGD9.611
Each (In a Tube of 100)
units
General Purpose Surface Mount SOIC Single Complementary 1 - 8 3 V, 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 80dB
RS Stock No. 661-2615
Mfr. Part No.LMV331IDBVR
SGD0.772
Each (In a Pack of 10)
units
General Purpose Surface Mount SOT-23 Single Open Collector 1 - 5 3 V, 5 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS Stock No. 528-343
Mfr. Part No.LM393DR
SGD0.161
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. 527-198
Mfr. Part No.LM339N
SGD0.597
Each (In a Pack of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 545-4799
Mfr. Part No.LT1016CN8#PBF
SGD8.27
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. 162-5392
Mfr. Part No.LMV331IDBVR
SGD0.34
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Single Open Collector 1 - 5 3 V, 5 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS Stock No. 533-8237
Mfr. Part No.LM339N/NOPB
SGD1.40
Each
units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 709-7389
Mfr. Part No.AD96687BRZ
SGD11.30
Each
units
General Purpose Surface Mount SOIC Dual Complementary 2 - 16 - 10 x 4 x 1.5mm 10mm 4mm 1.5mm 90dB
RS Stock No. 732-1193
Mfr. Part No.LM193JG
SGD12.45
Each
units
Differential Through Hole CDIP Dual, Single Open Collector, Open Drain 2 1.3µs 8 2 → 36 V 10.16 x 7.11 x 4.57mm 10.16mm 7.11mm 4.57mm -
RS Stock No. 100-0752
Mfr. Part No.LM393D
SGD0.417
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. 463-155
Mfr. Part No.LM339DG
SGD0.473
Each (In a Pack of 50)
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 -
RS Stock No. 178-4788
Mfr. Part No.LM339DG
SGD0.352
Each (In a Tube of 55)
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 -
RS Stock No. 536-1085
Mfr. Part No.LM2903M/NOPB
SGD0.99
Each (In a Pack of 20)
units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 806-2826
Mfr. Part No.LM339AN
SGD0.699
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 19.8 x 6.4 x 3.25mm 19.8mm 6.4mm 3.25mm -
RS Stock No. 163-2237
Mfr. Part No.NCS2200SQ2T2G
SGD0.62
Each (On a Reel of 3000)
units
Low Voltage Surface Mount SC-70 Single Complementary 1 16ns 5 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB
RS Stock No. 802-1686
Mfr. Part No.NCS2200SQ2T2G
SGD0.814
Each (In a Pack of 20)
units
Low Voltage Surface Mount SC-70 Single Complementary 1 16ns 5 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB
RS Stock No. 102-5746
Mfr. Part No.LM2903M/NOPB
SGD0.561
Each (In a Tube of 95)
units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 714-0830
Mfr. Part No.LM393D
SGD0.19
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
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