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. 163-0189
Mfr. Part No.NCS2202AMUTBG
R 1.629
Each (On a Reel of 3000)
units
Low Voltage Surface Mount UDFN Single Open Drain 1 - 6 0.85 → 6 V 1.2 x 1 x 0.5mm 1.2mm 1mm 0.5mm 80dB
RS stock no. 920-9859
Mfr. Part No.NCS2202AMUTBG
R 1.642
Each (In a Pack of 5)
units
Low Voltage Surface Mount UDFN Single Open Drain 1 - 6 0.85 → 6 V 1.2 x 1 x 0.5mm 1.2mm 1mm 0.5mm 80dB
RS stock no. 166-1860
Mfr. Part No.LM2903N
R 9.772
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 0.2 μs, 1.4 μs 8 2 → 36 V 9.6 x 6.4 x 3.4mm 9.6mm 6.4mm 3.4mm -
RS stock no. 463-139
Mfr. Part No.LM393DG
R 4.182
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS stock no. 145-3273
Mfr. Part No.LM393DG
R 3.80
Each (In a Tube of 98)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS stock no. 145-3123
Mfr. Part No.LM2901DG
R 4.291
Each (In a Tube of 55)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, TTL 4 1.3µs 14 36 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS stock no. 774-3476
Mfr. Part No.LM2901DG
R 7.642
Each (In a Pack of 5)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, TTL 4 1.3µs 14 36 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS stock no. 787-8816
Mfr. Part No.NCS2202SQ2T2G
R 4.03
Each (On a Tape of 10)
units
Low Power Surface Mount SC-70 Single Open Drain 1 35µs 5 0.85 → 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB
RS stock no. 162-9568
Mfr. Part No.NCS2202SQ2T2G
R 3.975
Each (On a Reel of 3000)
units
Low Power Surface Mount SC-70 Single Open Drain 1 35µs 5 0.85 → 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB
RS stock no. 463-656
Mfr. Part No.LM2903DG
R 4.576
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS stock no. 178-4788
Mfr. Part No.LM339DG
R 4.199
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. 463-155
Mfr. Part No.LM339DG
R 3.59
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. 163-2404
Mfr. Part No.LM2903DG
R 4.16
Each (In a Tube of 98)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS stock no. 145-5224
Mfr. Part No.LM311DR2G
R 2.354
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS 1 200ns 8 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS stock no. 806-2817
Mfr. Part No.LM339AM
R 1.911
Each (In a Tube of 54)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 8.76 x 4.2 x 1.65mm 8.76mm 4.2mm 1.65mm -
RS stock no. 774-3470
Mfr. Part No.LM2901NG
R 3.32
Each (In a Pack of 10)
units
General Purpose Through Hole PDIP Dual, Single CMOS, TTL 4 1.3µs 14 36 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS stock no. 689-9718
Mfr. Part No.LM339DR2G
R 7.642
Each (In a Pack of 5)
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. 163-2416
Mfr. Part No.LM339DR2G
R 1.323
Each (On a Reel of 2500)
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. 166-1847
Mfr. Part No.LM393M
R 1.747
Each (In a Tube of 90)
units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.4µs 8 2 → 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS stock no. 689-9702
Mfr. Part No.LM2901DR2G
R 1.428
Each (In a Pack of 5)
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 -