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. 178-4707
Mfr. Part No.LM339NG
PHP30.276
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS Stock No. 740-5562
Mfr. Part No.NJM2903MZ-TE1
PHP70.40
Each (In a Pack of 5)
units
General Purpose Surface Mount DMP Single Open Collector 2 1.5µs 8 2 → 36 V 5 x 5 x 1.6mm 5mm 5mm 1.6mm -
RS Stock No. 787-8721
Mfr. Part No.MC3302DR2G
PHP22.762
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. 102-5623
Mfr. Part No.LMV7271MF/NOPB
PHP42.738
Each (On a Reel of 1000)
units
Low Power Surface Mount SOT-23 Single Push-Pull 1 - 5 3 V, 5 V 2.92 x 1.6 x 1.02mm 2.92mm 1.6mm 1.02mm 78dB
RS Stock No. 877-9063
Mfr. Part No.ADCMP581BCPZ-WP
PHP1,005.90
Each
units
General Purpose Surface Mount LFCSP Dual ECL 1 0.037ns 16 - 3 x 3 x 0.8mm 3mm 3mm 0.8mm 60dB
RS Stock No. 661-2668
Mfr. Part No.TL331IDBVR
PHP22.382
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. 165-5531
Mfr. Part No.LM393ADT
PHP5.83
Each (On a Reel of 2500)
units
Low Power Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 651-1714
Mfr. Part No.LMV7271MF/NOPB
PHP66.092
Each (In a Pack of 5)
units
Low Power Surface Mount SOT-23 Single Push-Pull 1 - 5 3 V, 5 V 2.92 x 1.6 x 1.02mm 2.92mm 1.6mm 1.02mm 78dB
RS Stock No. 168-7454
Mfr. Part No.TS3022IDT
PHP56.923
Each (On a Reel of 2500)
units
High Speed Surface Mount SOIC Single Push-Pull 2 0.009µs 8 1.8 → 5 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm 67dB
RS Stock No. 660-4475
Mfr. Part No.TLV3501AIDBVT
PHP145.03
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. 877-2769
Mfr. Part No.LM393ADT
PHP14.626
Each (In a Pack of 25)
units
Low Power Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 697-7549
Mfr. Part No.ADCMP553BRMZ
PHP229.19
Each
units
General Purpose Surface Mount MSOP Single Complementary 1 - 8 3.3 V 3 x 3 x 0.85mm 3mm 3mm 0.85mm 76dB
RS Stock No. 760-9468
Mfr. Part No.TS3022IDT
PHP78.23
Each (In a Pack of 5)
units
High Speed Surface Mount SOIC Single Push-Pull 2 0.009µs 8 1.8 → 5 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm 67dB
RS Stock No. 759-9368
Mfr. Part No.LM2901MX
PHP24.99
Each (In a Pack of 10)
units
General Purpose Surface Mount SOP Dual, Single Open Collector 4 0.3 μs, 1.3 μs 14 2 → 36 V 8.76 x 4.2 x 1.65mm 8.76mm 4.2mm 1.65mm -
RS Stock No. 162-9391
Mfr. Part No.MC3302DR2G
PHP11.343
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. 145-6604
Mfr. Part No.LT1715CMS#PBF
PHP310.129
Each (In a Tube of 50)
units
General Purpose Surface Mount MSOP Single CMOS, Open Collector, Rail to Rail, TTL 2 - 10 2.7 → 12 V 3 x 3 x 0.9984mm 3mm 3mm 0.998mm 70dB
RS Stock No. 160-2883
Mfr. Part No.ADCMP581BCPZ-WP
PHP825.83
Each (In a Tray of 50)
units
General Purpose Surface Mount LFCSP Dual ECL 1 0.037ns 16 - 3 x 3 x 0.8mm 3mm 3mm 0.8mm 60dB
RS Stock No. 163-2416
Mfr. Part No.LM339DR2G
PHP4.608
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. 779-9394
Mfr. Part No.LT1715CMS#PBF
PHP396.62
Each
units
General Purpose Surface Mount MSOP Single CMOS, Open Collector, Rail to Rail, TTL 2 - 10 2.7 → 12 V 3 x 3 x 0.9984mm 3mm 3mm 0.998mm 70dB
RS Stock No. 689-9718
Mfr. Part No.LM339DR2G
PHP23.716
Each (In a Pack of 5)
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 -
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