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. 145-3273
Mfr. Part No.LM393DG
kr 2,433
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. 463-139
Mfr. Part No.LM393DG
kr 2,68
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. 162-9340
Mfr. Part No.LM211DR2G
kr 1,486
Each (On a Reel of 2500)
Units
General Purpose Surface Mount SOIC Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 → 30 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 121-6493
Mfr. Part No.NCS2200SN1T1G
kr 3,584
Each (On a Reel of 3000)
Units
Low Voltage Surface Mount SOT-23 Single Rail to Rail 1 - 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS Stock No. 162-9353
Mfr. Part No.LM339DTBR2G
kr 1,091
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. 759-9386
Mfr. Part No.LM319MX
kr 3,888
Each (In a Pack of 10)
Units
High Speed Surface Mount SOP Dual, Single Open Collector 2 0.08µs 14 5 V 8.76 x 4.2 x 1.65mm 8.76mm 4.2mm 1.65mm -
RS Stock No. 145-5224
Mfr. Part No.LM311DR2G
kr 1,26
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. 689-9727
Mfr. Part No.LM393DR2G
kr 3,55
Each (In a Pack of 5)
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. 162-9345
Mfr. Part No.LM2903DMR2G
kr 0,793
Each (On a Reel of 4000)
Units
General Purpose Surface Mount MSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm -
RS Stock No. 787-8807
Mfr. Part No.NCS2200SN2T1G
kr 5,763
Each (On a Tape of 10)
Units
Low Power Surface Mount SOT-23 Single Complementary 1 35µs 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS Stock No. 787-8658
Mfr. Part No.LM339DTBR2G
kr 3,011
Each (On a Tape of 20)
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. 805-1365
Mfr. Part No.LM311DR2G
kr 2,792
Each (On a Tape of 25)
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. 802-4290
Mfr. Part No.NCS2200SN1T1G
kr 5,499
Each (In a Pack of 20)
Units
Low Voltage Surface Mount SOT-23 Single Rail to Rail 1 - 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS Stock No. 163-0737
Mfr. Part No.NCV2200SN2T1G
kr 3,198
Each (On a Reel of 3000)
Units
Low Voltage Surface Mount SOT-23 Single Complementary 1 16ns 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS Stock No. 185-8088
Mfr. Part No.NCS2250SN2T1G
kr 1,881
Each (On a Reel of 3000)
Units
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS Stock No. 185-9089
Mfr. Part No.NCV2252SN2T1G
kr 4,885
Each (In a Pack of 13)
Units
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS Stock No. 163-2396
Mfr. Part No.LM239DR2G
kr 0,775
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. 671-0258
Mfr. Part No.KA2803B
kr 4,846
Each (In a Pack of 5)
Units
General Purpose Through Hole PDIP - - - - 8 - 10.15 x 6.35 x 3.3mm 10.15mm 6.35mm 3.3mm -
RS Stock No. 172-3373
Mfr. Part No.TL331VSN4T3G
kr 3,896
Each (In a Pack of 25)
Units
Low Power Surface Mount TSOP Dual, Single CMOS, DTL, ECL, TTL 1 - 5 2 → 36 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm -
RS Stock No. 689-9711
Mfr. Part No.LM2903DR2G
kr 3,63
Each (In a Pack of 5)
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 -