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. 153-3393
Mfr. Part No.LT1016CN8#PBF
$6.691
Each (In a Tube of 50)
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. 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. 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. 761-8908
Mfr. Part No.LT6703HVIS5-3#TRMPBF
$2.50
Each
units
Low Voltage Surface Mount TSOT-23 Single Open Collector 1 - 5 1.4 → 18 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm -
RS Stock No. 145-5720
Mfr. Part No.TLC3704CN
$1.99
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. 121-8692
Mfr. Part No.LM319N/NOPB
$2.798
Each (In a Tube of 25)
units
High Speed Through Hole MDIP Dual, Single Open Collector 2 0.08µs 14 9 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 166-1860
Mfr. Part No.LM2903N
$0.413
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. 165-1899
Mfr. Part No.MCP6541RT-I/OT
BrandMicrochip
$0.456
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Single Push-Pull 1 0.85µs 5 1.6 → 5.5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 70dB
RS Stock No. 661-2668
Mfr. Part No.TL331IDBVR
$0.735
Each (In a Pack of 10)
units
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 3 → 28 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS Stock No. 121-9135
Mfr. Part No.TL331IDBVR
$0.343
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 3 to 28 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS Stock No. 162-6241
Mfr. Part No.LM361N/NOPB
$3.67
Each (In a Tube of 25)
units
High Speed Through Hole PDIP Dual TTL 2 0.02µs 14 - 19.56 x 6.35 x 3.429mm 19.56mm 6.35mm 3.43mm -
RS Stock No. 649-497
Mfr. Part No.TLC3704CN
$2.59
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. 660-4475
Mfr. Part No.TLV3501AIDBVT
$5.15
Each
units
General Purpose Surface Mount SOT-23 Single Push-Pull 1 - 6 3 V, 5 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm 70dB
RS Stock No. 686-7515
Mfr. Part No.TS393IDT
$1.14
Each (In a Pack of 10)
units
Low Power Surface Mount SOIC Dual, Single Open Drain 2 2.5µs 8 3 → 15 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 71dB
RS Stock No. 761-5873
Mfr. Part No.LM361N/NOPB
$4.08
Each (In a Pack of 5)
units
High Speed Through Hole PDIP Dual TTL 2 0.02µs 14 - 19.56 x 6.35 x 3.429mm 19.56mm 6.35mm 3.43mm -
RS Stock No. 640-7902
Mfr. Part No.LM361N
$3.64
Each
units
General Purpose Through Hole MDIP Dual, Single Differential 2 - 14 5 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 160-1749
Mfr. Part No.AD8611ARMZ-R2
$6.52
Each (On a Reel of 250)
units
High Speed Surface Mount MSOP Single Complementary 1 2.5ns 8 3 → 5 V 3.2 x 3.2 x 0.95mm 3.2mm 3.2mm 0.95mm 85dB
RS Stock No. 661-2589
Mfr. Part No.LM2903DGKR
$0.525
Each (In a Pack of 10)
units
Differential Surface Mount MSOP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 3 x 3 x 0.97mm 3mm 3mm 0.97mm -
RS Stock No. 919-9364
Mfr. Part No.LT6703HVIS5-3#TRMPBF
$2.228
Each (On a Reel of 500)
units
Low Voltage Surface Mount TSOT-23 Single Open Collector 1 - 5 1.4 → 18 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm -
RS Stock No. 761-7942
Mfr. Part No.LT1017CS8#PBF
$9.12
Each
units
Low Power Surface Mount SOIC Dual, Single Push-Pull 2 - 8 40 V 5.004 x 3.988 x 1.498mm 5mm 3.988mm 1.498mm 115dB
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