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. 162-5373
Mfr. Part No.LM2901N
£0.249
Each (In a Tube of 25)
Units
Differential Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 709-2441
Mfr. Part No.LM3302N
£0.76
Each (In a Pack of 5)
Units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 24 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 528-157
Mfr. Part No.LM311DR
£0.284
Each (In a Pack of 25)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 178-9080
Mfr. Part No.LM3302N
£0.592
Each (In a Tube of 25)
Units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 24 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 920-3475
Mfr. Part No.LM311D
£0.333
Each (In a Tube of 75)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 517-2396
Mfr. Part No.LM311D
£0.356
Each (In a Pack of 20)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 527-530
Mfr. Part No.LM211DR
£0.423
Each (In a Pack of 25)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 179-1657
Mfr. Part No.LM211D
£0.589
Each (In a Tube of 75)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 517-2352
Mfr. Part No.LM211D
£0.504
Each (In a Pack of 20)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 917-3523
Mfr. Part No.LT1716CS5#TRMPBF
£1.203
Each (On a Reel of 500)
Units
General Purpose Surface Mount TSOT-23 Dual, Single Open Collector 1 - 5 3 → 28 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm 110dB
RS Stock No. 812-0449
Mfr. Part No.TPS3700DDCT
£1.389
Each (In a Pack of 10)
Units
Window Surface Mount TSOT-23 Single Open Drain 2 2.2µs 6 1.8 → 18 V 3.05 x 1.75 x 1mm 3.05mm 1.75mm 1mm -
RS Stock No. 506-0372
Mfr. Part No.LT1716CS5#TRMPBF
£1.986
Each (In a Pack of 5)
Units
General Purpose Surface Mount TSOT-23 Dual, Single Open Collector 1 - 5 3 → 28 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm 110dB
RS Stock No. 121-9350
Mfr. Part No.TPS3700DDCT
£1.059
Each (On a Reel of 250)
Units
- Surface Mount TSOT-23 - - - - 6 - 3.05 x 1.75 x 1mm 3.05mm 1.75mm 1mm -
RS Stock No. 517-1810
Mfr. Part No.LM239D
£0.281
Each (In a Pack of 20)
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. 822-5840
Mfr. Part No.LT1711CMS8#PBF
£3.94
Each (In a Pack of 2)
Units
High Speed Surface Mount MSOP Dual, Single Rail to Rail 1 2ns 8 2.4 → 12 V 3 x 3 x 1.095mm 3mm 3mm 1.095mm 75dB
RS Stock No. 920-0066
Mfr. Part No.LT1711CMS8#PBF
£2.618
Each (In a Tube of 50)
Units
High Speed Surface Mount MSOP Dual, Single Rail to Rail 1 2ns 8 2.4 → 12 V 3 x 3 x 1.095mm 3mm 3mm 1.095mm 75dB
RS Stock No. 146-1118
Mfr. Part No.MAX941CPA+
BrandMaxim
£2.228
Each (In a Tube of 50)
Units
General Purpose Through Hole PDIP Single - 1 - 8 3 V, 5 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 81.94dB
RS Stock No. 146-535
Mfr. Part No.MAX941CPA+
BrandMaxim
£2.50
Each
Units
General Purpose Through Hole PDIP Single - 1 - 8 3 V, 5 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 81.94dB
RS Stock No. 179-2068
Mfr. Part No.LM239D
£0.258
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. 923-3454
Mfr. Part No.TLV3501AIDBVT
£1.431
Each (On a Reel of 250)
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
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