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. 169-8573
Mfr. Part No.LM319MX
$0.355
Each (On a Reel of 3000)
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. 806-2804
Mfr. Part No.LM319M
$0.725
Each (In a Tube of 54)
units
General Purpose Surface Mount SOP Single Open Collector 2 80ns 14 5 V 8.76 x 4.2 x 1.65mm 8.76mm 4.2mm 1.65mm -
RS Stock No. 166-1860
Mfr. Part No.LM2903N
$0.455
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. 759-9386
Mfr. Part No.LM319MX
$0.624
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. 759-9374
Mfr. Part No.LM2903N
$0.775
Each (In a Pack of 25)
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. 806-2826
Mfr. Part No.LM339AN
$1.075
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 19.8 x 6.4 x 3.25mm 19.8mm 6.4mm 3.25mm -
RS Stock No. 787-8617
Mfr. Part No.LM2903NG
$0.606
Each (In a Pack of 25)
units
General Purpose Through Hole PDIP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 10.02 x 7.11 x 5.33mm 10.02mm 7.11mm 5.33mm -
RS Stock No. 121-6402
Mfr. Part No.LM2903NG
$0.353
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 10.02 x 7.11 x 5.33mm 10.02mm 7.11mm 5.33mm -
RS Stock No. 787-8721
Mfr. Part No.MC3302DR2G
$0.718
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. 162-9391
Mfr. Part No.MC3302DR2G
$0.456
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. 689-9727
Mfr. Part No.LM393DR2G
$0.218
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. 787-8620
Mfr. Part No.LM2903VDR2G
$0.565
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 806-2817
Mfr. Part No.LM339AM
$0.446
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. 463-656
Mfr. Part No.LM2903DG
$0.50
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. 806-2772
Mfr. Part No.LM2901N
$0.559
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 19.8 x 6.4 x 3.25mm 19.8mm 6.4mm 3.25mm -
New
RS Stock No. 185-8090
Mfr. Part No.NCS2252SN2T1G
$0.398
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
New
RS Stock No. 185-9024
Mfr. Part No.NCS2250SN2T1G
$1.208
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. 145-3881
Mfr. Part No.LM2901DR2G
$0.132
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 -
New
RS Stock No. 185-9089
Mfr. Part No.NCV2252SN2T1G
$1.231
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. 163-2237
Mfr. Part No.NCS2200SQ2T2G
$0.686
Each (On a Reel of 3000)
units
Low Voltage Surface Mount SC-70 Single Complementary 1 16ns 5 6 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 65dB