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. 121-8871
Mfr. Part No.LM393M/NOPB
SGD1.05
Each (In a Tube of 95)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 to 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 536-1388
Mfr. Part No.LM393M/NOPB
SGD1.56
Each
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 912-9863
Mfr. Part No.ADCMP601BKSZ-R2
SGD5.472
Each (On a Reel of 250)
units
High Speed Surface Mount SC-70 Single CMOS, TTL 1 0.005µs 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 50dB
RS Stock No. 759-2727
Mfr. Part No.ADCMP601BKSZ-R2
SGD8.81
Each
units
High Speed Surface Mount SC-70 Single CMOS, TTL 1 0.005µs 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 50dB
RS Stock No. 759-9370
Mfr. Part No.LM2903MX
SGD0.26
Each (On a Tape of 25)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 2 0.35 μs, 1.4 μs 8 2 → 36 V 5.13 x 3.95 x 1.55mm 5.13mm 3.95mm 1.55mm -
RS Stock No. 166-1610
Mfr. Part No.LM2903MX
SGD0.254
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 2 0.35 μs, 1.4 μs 8 2 → 36 V 5.13 x 3.95 x 1.55mm 5.13mm 3.95mm 1.55mm -
RS Stock No. 159-7908
Mfr. Part No.AD96685BRZ
SGD8.183
Each (In a Tube of 48)
units
General Purpose Surface Mount SOIC Dual Complementary 1 - 16 - 10 x 4 x 1.5mm 10mm 4mm 1.5mm 90dB
RS Stock No. 709-7382
Mfr. Part No.AD96685BRZ
SGD10.90
Each
units
General Purpose Surface Mount SOIC Dual Complementary 1 - 16 - 10 x 4 x 1.5mm 10mm 4mm 1.5mm 90dB
RS Stock No. 463-656
Mfr. Part No.LM2903DG
SGD0.429
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. 671-0258
Mfr. Part No.KA2803B
SGD0.588
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. 102-2219
Mfr. Part No.LM393NG
SGD0.309
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 10.16 x 6.6 x 3.44mm 10.16mm 6.6mm 3.44mm -
RS Stock No. 170-2065
Mfr. Part No.LM211D
SGD0.227
Each (In a Tube of 75)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS Stock No. 163-2404
Mfr. Part No.LM2903DG
SGD0.35
Each (In a Tube of 98)
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. 714-0704
Mfr. Part No.LM211D
SGD0.637
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
New
RS Stock No. 178-5191
Mfr. Part No.LM211DT
SGD0.225
Each (On a Reel of 2500)
units
- - - - - - - - - - - - - -
RS Stock No. 463-870
Mfr. Part No.LM393NG
SGD0.538
Each (In a Pack of 20)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 10.16 x 6.6 x 3.44mm 10.16mm 6.6mm 3.44mm -
RS Stock No. 145-5313
Mfr. Part No.KA2803B
SGD0.342
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP - - - - 8 - 10.15 x 6.35 x 3.3mm 10.15mm 6.35mm 3.3mm -
RS Stock No. 649-497
Mfr. Part No.TLC3704CN
SGD2.21
Each
units
Low Power Through Hole PDIP Single Push-Pull 4 2.7µs 14 5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm 84dB
RS Stock No. 145-5720
Mfr. Part No.TLC3704CN
SGD1.114
Each (In a Tube of 25)
units
Low Power Through Hole PDIP Single Push-Pull 4 2.7µs 14 5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm 84dB
RS Stock No. 877-2740
Mfr. Part No.LM211DT
SGD0.467
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single TTL 1 200ns 8 5 V 5 x 4 x 1.65mm 5mm 4mm 1.65mm -
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