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. 761-5864
Mfr. Part No.LM361M/NOPB
£2.116
Each (In a Pack of 5)
Units
High Speed Surface Mount SOIC Dual TTL 2 0.02µs 14 - 8.738 x 3.988 x 1.499mm 8.74mm 3.99mm 1.5mm -
RS Stock No. 195-082
Mfr. Part No.AD790JRZ
£7.73
Each
Units
General Purpose Surface Mount SOIC Dual, Single TTL 1 - 8 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 95dB
RS Stock No. 796-7997
Mfr. Part No.LM111JG
£15.145
Each (In a Pack of 2)
Units
General Purpose Through Hole CDIP Single Open Collector, Open Drain 1 115 ns, 165 ns 8 5 V 10.16 x 7.11 x 5.08mm 10.16mm 7.11mm 5.08mm -
RS Stock No. 165-9281
Mfr. Part No.MAX942CSA+
£2.178
Each (In a Tube of 100)
Units
General Purpose Surface Mount SOIC Single - 2 - 8 3 V, 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 81.94dB
RS Stock No. 732-7220
Mfr. Part No.MAX942CSA+
£2.44
Each
Units
General Purpose Surface Mount SOIC Single - 2 - 8 3 V, 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 81.94dB
RS Stock No. 806-2807
Mfr. Part No.LM319N
£0.372
Each (In a Tube of 25)
Units
General Purpose Through Hole PDIP Single Open Collector 2 80ns 14 5 V 19.8 x 6.4 x 3.25mm 19.8mm 6.4mm 3.25mm -
RS Stock No. 153-3559
Mfr. Part No.LT1011CN8#PBF
£1.686
Each (In a Tube of 50)
Units
General Purpose Through Hole PDIP Dual, Single Open Collector 1 0.15µs 8 30 V 10.16 x 6.477 x 3.302mm 10.16mm 6.477mm 3.302mm 115dB
RS Stock No. 166-1847
Mfr. Part No.LM393M
£0.065
Each (In a Tube of 90)
Units
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.4µs 8 2 → 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 178-8867
Mfr. Part No.LM392M/NOPB
£1.079
Each (In a Tube of 95)
Units
Low Power Surface Mount SOIC - - - - 8 - 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 761-7927
Mfr. Part No.LT1011CN8#PBF
£2.54
Each
Units
General Purpose Through Hole PDIP Dual, Single Open Collector 1 0.15µs 8 30 V 10.16 x 6.477 x 3.302mm 10.16mm 6.477mm 3.302mm 115dB
RS Stock No. 536-1372
Mfr. Part No.LM392M/NOPB
£0.52
Each
Units
Low Power Surface Mount SOIC - - - - 8 - 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 761-4463
Mfr. Part No.LM393M
£0.242
Each (In a Pack of 10)
Units
General Purpose Surface Mount SOP Dual, Single TTL 2 1.5µs 8 36 V 4.92 x 3.95 x 1.55mm 4.92mm 3.95mm 1.55mm -
RS Stock No. 709-2043
Mfr. Part No.LM211P
£0.339
Each (In a Pack of 20)
Units
General Purpose Through Hole PDIP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 661-2781
Mfr. Part No.LM2901N
£0.291
Each (In a Pack of 10)
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. 162-5373
Mfr. Part No.LM2901N
£0.265
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. 517-2396
Mfr. Part No.LM311D
£0.399
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. 178-9080
Mfr. Part No.LM3302N
£0.578
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. 709-2441
Mfr. Part No.LM3302N
£0.686
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
£0.304
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. 920-3475
Mfr. Part No.LM311D
£0.363
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 -
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