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. 168-7248
Mfr. Part No.LM339PT
£0.088
Each (On a Reel of 2500)
Units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
RS Stock No. 536-1085
Mfr. Part No.LM2903M/NOPB
£0.636
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. 523-8711
Mfr. Part No.AD8561ANZ
£4.55
Each
Units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V, 9 V 9.27 x 7.24 x 3.43mm 9.27mm 7.24mm 3.43mm 85dB
RS Stock No. 102-5746
Mfr. Part No.LM2903M/NOPB
£0.581
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. 165-4794
Mfr. Part No.MCP6562-E/SN
BrandMicrochip
£0.451
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. 669-6275
Mfr. Part No.MCP6562-E/SN
BrandMicrochip
£0.592
Each (In a Pack of 5)
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. 912-7514
Mfr. Part No.AD8561ANZ
£3.499
Each (In a Tube of 50)
Units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V, 9 V 9.27 x 7.24 x 3.43mm 9.27mm 7.24mm 3.43mm 85dB
RS Stock No. 795-8458
Mfr. Part No.LM339PT
£0.235
Each (On a Tape of 25)
Units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
RS Stock No. 806-2823
Mfr. Part No.LM393AM
£0.116
Each (In a Tube of 90)
Units
General Purpose Surface Mount SOIC Dual, Single Differential 2 1.4µs 8 ±1 → ±18 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 145-8957
Mfr. Part No.MCP6541-E/SN
BrandMicrochip
£0.283
Each (In a Tube of 100)
Units
Low Power Surface Mount SOIC Single Push-Pull 1 - 8 3 V, 5 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 70dB
RS Stock No. 759-1553
Mfr. Part No.ADCMP573BCPZ-R2
£16.92
Each
Units
High Speed Surface Mount LFCSP VQ Single RSPECL 1 0.000165µs 16 3.3 → 5.2 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 160-2532
Mfr. Part No.ADCMP573BCPZ-WP
£12.632
Each (In a Tray of 50)
Units
High Speed Surface Mount LFCSP VQ Single Complementary 1 - 16 3.1 → 5.4 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 669-6200
Mfr. Part No.MCP6541-E/SN
BrandMicrochip
£0.328
Each (In a Pack of 10)
Units
Low Power Surface Mount SOIC Single Push-Pull 1 - 8 3 V, 5 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 70dB
RS Stock No. 182-2491
Mfr. Part No.TLC372CP
£2.01
Each
Units
General Purpose Through Hole PDIP Dual, Single Open Drain 2 0.65µs 8 5 → 15 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 807-1710
Mfr. Part No.ADCMP573BCPZ-WP
£15.38
Each
Units
High Speed Surface Mount LFCSP VQ Single Complementary 1 - 16 3.1 → 5.4 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 159-7680
Mfr. Part No.ADCMP573BCPZ-R2
£11.799
Each (On a Reel of 250)
Units
High Speed Surface Mount LFCSP VQ Single RSPECL 1 0.000165µs 16 3.3 → 5.2 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS Stock No. 121-8671
Mfr. Part No.LM2903D
£0.284
Each (In a Tube of 75)
Units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 162-4361
Mfr. Part No.TLC372CP
£0.794
Each (In a Tube of 50)
Units
General Purpose Through Hole PDIP Dual, Single Open Drain 2 0.65µs 8 5 → 15 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 528-353
Mfr. Part No.LM2903DR
£0.232
Each (In a Pack of 25)
Units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 517-2374
Mfr. Part No.LM2903D
£0.313
Each (In a Pack of 20)
Units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
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