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. 102-5746
Mfr. Part No.LM2903M/NOPB
$1.18
Each (In a Tube of 95)
units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 738-7036
Mfr. Part No.MCP6567-E/MS
BrandMicrochip
$1.12
Each (In a Pack of 5)
units
General Purpose Surface Mount MSOP Single Open Drain 2 - 8 1.8 → 5.5 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 536-1085
Mfr. Part No.LM2903M/NOPB
$1.73
Each (In a Pack of 20)
units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 121-8828
Mfr. Part No.LMV7219M5/NOPB
$2.151
Each (On a Reel of 1000)
units
General Purpose Surface Mount SOT-23 Single Push-Pull 1 - 5 2.7 → 5 V 2.92 x 1.6 x 1.02mm 2.92mm 1.6mm 1.02mm 85dB
RS Stock No. 880-5490
Mfr. Part No.TS391IYLT
$1.13
Each (In a Pack of 10)
units
General Purpose Surface Mount SOT-23 Dual, Single CMOS, DTL, ECL, TTL 1 1.3 ns/μs, 300 ns/μs 5 ±2 → ±36 V 1.75 x 3 x 1.3mm 1.75mm 3mm 1.3mm -
RS Stock No. 528-365
Mfr. Part No.LM2901DR
$0.419
Each (In a Pack of 25)
units
Differential 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. 145-7305
Mfr. Part No.LM2901D
$0.544
Each (In a Tube of 50)
units
Differential 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. 738-7020
Mfr. Part No.MCP6562-E/MS
BrandMicrochip
$1.12
Each (In a Pack of 5)
units
General Purpose Surface Mount MSOP Single Push-Pull 2 0.02µs 8 1.8 → 5.5 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 534-4260
Mfr. Part No.LMC7211BIM5/NOPB
$4.30
Each
units
General Purpose Surface Mount SOT-23 Single Push-Pull 1 4µs 5 3 → 12 V 2.92 x 1.6 x 1.02mm 2.92mm 1.6mm 1.02mm 75dB
RS Stock No. 661-2804
Mfr. Part No.LM311PW
$0.713
Each (In a Pack of 10)
units
General Purpose Surface Mount TSSOP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 3 x 4.4 x 1.15mm 3mm 4.4mm 1.15mm -
RS Stock No. 121-8823
Mfr. Part No.LMC7211BIM5/NOPB
$0.911
Each (On a Reel of 1000)
units
General Purpose Surface Mount SOT-23 Single Push-Pull 1 4µs 5 3 to 12 V 2.92 x 1.6 x 1.02mm 2.92mm 1.6mm 1.02mm 75dB
RS Stock No. 124-4526
Mfr. Part No.LM311N/NOPB
$1.12
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. 165-4794
Mfr. Part No.MCP6562-E/SN
BrandMicrochip
$0.826
Each (In a Tube of 100)
units
General Purpose Surface Mount SOIC Single Push-Pull 2 - 8 3 V, 5 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 66dB
RS Stock No. 169-5575
Mfr. Part No.LM311PW
$0.42
Each (In a Tube of 150)
units
General Purpose Surface Mount TSSOP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 3 x 4.4 x 1.15mm 3mm 4.4mm 1.15mm -
RS Stock No. 866-0219
Mfr. Part No.LM311N/NOPB
$1.08
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. 709-7073
Mfr. Part No.AD8214ARMZ
$3.24
Each
units
High Voltage Surface Mount MSOP Single - - - 8 5 → 65 V 3 x 3 x 0.85mm 3mm 3mm 0.85mm -
RS Stock No. 689-9727
Mfr. Part No.LM393DR2G
$0.754
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. 159-7871
Mfr. Part No.AD8214ARMZ
$2.61
Each (In a Tube of 50)
units
High Voltage Surface Mount MSOP Single - - - 8 5 → 65 V 3 x 3 x 0.85mm 3mm 3mm 0.85mm -
RS Stock No. 545-4799
Mfr. Part No.LT1016CN8#PBF
$11.44
Each
units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V 10.16 x 6.48 x 3.3mm 10.16mm 6.48mm 3.3mm 96dB
RS Stock No. 146-0175
Mfr. Part No.MCP6562-E/MS
BrandMicrochip
$0.826
Each (In a Tube of 100)
units
General Purpose Surface Mount MSOP Single Push-Pull 2 0.02µs 8 1.8 → 5.5 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
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