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. 100-0750
Mfr. Part No.LM339D
SGD0.45
Each (In a Tube of 50)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -
RS Stock No. 145-3273
Mfr. Part No.LM393DG
SGD0.422
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. 713-9405
Mfr. Part No.NJM2903RB1-TE1
SGD0.636
Each (In a Pack of 5)
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. 536-0420
Mfr. Part No.LMV762MA/NOPB
SGD4.04
Each (In a Pack of 5)
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. 145-6113
Mfr. Part No.LM2901PW
SGD0.528
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. 536-1344
Mfr. Part No.LM339M/NOPB
SGD1.50
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
SGD0.464
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. 121-8305
Mfr. Part No.LM311P
SGD0.498
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 809-6365
Mfr. Part No.LMV331IDCKR
SGD0.793
Each (In a Pack of 10)
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. 823-9287
Mfr. Part No.INA300AIDSQT
SGD2.25
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. 858-411
Mfr. Part No.LM339D
SGD0.66
Each
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -
RS Stock No. 810-267
Mfr. Part No.LM2903P
SGD0.66
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. 179-1592
Mfr. Part No.LM2901M/NOPB
SGD1.379
Each (In a Tube of 55)
units
Differential 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. 661-2785
Mfr. Part No.LM2901PW
SGD0.50
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. 124-4526
Mfr. Part No.LM311N/NOPB
SGD1.058
Each (In a Pack of 10)
units
Voltage Through Hole PDIP Single Single Ended 1 200ns 8 Maximum of 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 866-0219
Mfr. Part No.LM311N/NOPB
SGD1.05
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. 922-3287
Mfr. Part No.TLV3502AIDCNT
SGD4.098
Each (On a Reel of 250)
units
General Purpose Surface Mount SOT-23 Single Push-Pull 2 - 8 3 V, 5 V 2.9 x 1.63 x 1.1mm 2.9mm 1.63mm 1.1mm 70dB
RS Stock No. 534-2999
Mfr. Part No.LM392N/NOPB
SGD2.15
Each
units
Low Power Through Hole MDIP - - - - 8 - 9.27 x 6.35 x 3.3mm 9.27mm 6.35mm 3.3mm -
RS Stock No. 168-7143
Mfr. Part No.LM239ADT
SGD0.242
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DTL, 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. 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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