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. 661-2624
Mfr. Part No.LMV339IDR
SGD0.229
Each (In a Pack of 10)
units
General Purpose Surface Mount SOIC Single Open Collector 4 - 14 3 V, 5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -
RS Stock No. 166-1860
Mfr. Part No.LM2903N
SGD0.439
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. 823-9287
Mfr. Part No.INA300AIDSQT
SGD2.138
Each (In a Pack of 5)
units
Current Sense Surface Mount SON Single Open Drain 1 100µs 10 0 → 36 V 2.1 x 2.1 x 0.75mm 2.1mm 2.1mm 0.75mm 120dB
RS Stock No. 162-8177
Mfr. Part No.LM193H/NOPB
SGD8.447
Each (In a Box of 500)
units
Differential Through Hole TO-99 Dual, Single Open Collector, Open Drain 2 1.3µs 8 2 → 36 V 9.4 x 4.7mm 9.4mm - 4.7mm -
RS Stock No. 661-2785
Mfr. Part No.LM2901PW
SGD0.295
Each (In a Pack of 10)
units
Differential Surface Mount TSSOP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm -
RS Stock No. 121-8870
Mfr. Part No.LM339M/NOPB
SGD1.06
Each (In a Tube of 55)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 to 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 601-5761
Mfr. Part No.UPC277G2-A
SGD1.534
Each (In a Pack of 5)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 2 1.8µs 8 ±1 → ±16 V 5.2 x 4.4 x 1.49mm 5.2mm 4.4mm 1.49mm -
RS Stock No. 536-1344
Mfr. Part No.LM339M/NOPB
SGD1.38
Each
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 463-139
Mfr. Part No.LM393DG
SGD0.414
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. 145-6113
Mfr. Part No.LM2901PW
SGD0.205
Each (In a Tube of 90)
units
Differential Surface Mount TSSOP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm -
RS Stock No. 162-9353
Mfr. Part No.LM339DTBR2G
SGD0.208
Each (On a Reel of 2500)
units
General Purpose Surface Mount TSSOP Dual, Single CMOS, TTL 4 1.3µs 14 3 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
RS Stock No. 145-1185
Mfr. Part No.LMV762MA/NOPB
SGD2.242
Each (In a Tube of 95)
units
Low Voltage Surface Mount SOIC Single Push-Pull 2 - 8 3 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm 100dB
RS Stock No. 661-2781
Mfr. Part No.LM2901N
SGD0.471
Each (In a Pack of 10)
units
Differential 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. 162-5394
Mfr. Part No.LMV339IDR
SGD0.257
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Single Open Collector 4 - 14 3 V, 5 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -
RS Stock No. 810-267
Mfr. Part No.LM2903P
SGD0.62
Each
units
Differential Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 828-7551
Mfr. Part No.AS393MTR-G1
SGD0.10
Each (In a Pack of 50)
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. 169-8165
Mfr. Part No.NJM2903RB1-TE1
SGD0.565
Each (On a Reel of 2000)
units
General Purpose Surface Mount TVSP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 2.9 x 2.8 x 0.85mm 2.9mm 2.8mm 0.85mm -
RS Stock No. 162-6586
Mfr. Part No.LMV331IDCKR
SGD0.341
Each (On a Reel of 3000)
units
Low Power Surface Mount SC-70 Single Open Collector 1 - 5 2.7 → 5.5 V 2.15 x 1.4 x 1mm 2.15mm 1.4mm 1mm -
RS Stock No. 866-0219
Mfr. Part No.LM311N/NOPB
SGD0.70
Each (In a Tube of 40)
units
General Purpose Through Hole PDIP Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 178-4707
Mfr. Part No.LM339NG
SGD0.87
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
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