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. 787-8721
Mfr. Part No.MC3302DR2G
SGD0.629
Each (In a Pack of 10)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, TTL 4 1.3µs 14 3 → 30 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS Stock No. 497-3716
Mfr. Part No.AD8611ARZ
SGD7.99
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. 714-0833
Mfr. Part No.LM393DT
SGD0.439
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS Stock No. 162-9391
Mfr. Part No.MC3302DR2G
SGD0.312
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, TTL 4 1.3µs 14 3 → 30 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
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 -
RS Stock No. 517-2374
Mfr. Part No.LM2903D
SGD0.243
Each (In a Pack of 20)
units
Differential 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. 761-9064
Mfr. Part No.LTC1540CS8#PBF
SGD5.79
Each
units
Low Power Surface Mount SOIC Dual, Single CMOS, TTL 1 - 8 2 to 11 V 5.004 x 3.988 x 1.498mm 5mm 3.988mm 1.498mm 0.1mV/V
RS Stock No. 165-7717
Mfr. Part No.LM339DT
SGD0.087
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 714-0811
Mfr. Part No.LM339D
SGD0.27
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 660-6711
Mfr. Part No.LM2903QDRQ1
SGD0.449
Each (In a Pack of 10)
units
Differential 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. 689-9708
Mfr. Part No.LM239DR2G
SGD0.568
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. 912-8974
Mfr. Part No.AD8611ARZ
SGD5.712
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. 517-2396
Mfr. Part No.LM311D
SGD0.587
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 145-9204
Mfr. Part No.LM339D
SGD0.104
Each (In a Tube of 50)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 121-8671
Mfr. Part No.LM2903D
SGD0.473
Each (In a Tube of 75)
units
Differential 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. 163-2396
Mfr. Part No.LM239DR2G
SGD0.165
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. 714-0815
Mfr. Part No.LM339DT
SGD0.37
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 528-353
Mfr. Part No.LM2903DR
SGD0.222
Each (In a Pack of 25)
units
Differential 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. 162-5066
Mfr. Part No.LM2903QDRQ1
SGD0.257
Each (On a Reel of 2500)
units
Differential 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. 921-2902
Mfr. Part No.LM111H/NOPB
SGD8.994
Each (On a Reel of 500)
units
General Purpose Through Hole TO-99 Dual, Single Open Collector, Open Drain 1 200ns 8 5 → 36 V 9.4 x 4.7mm 9.4mm - 4.7mm -
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