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. 740-5562
Mfr. Part No.NJM2903MZ-TE1
HK$8.402
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. 178-2306
Mfr. Part No.NJM2403D
HK$2.668
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 8.8 x 6.4 x 3.4mm 8.8mm 6.4mm 3.4mm -
RS Stock No. 178-2405
Mfr. Part No.NJM2903M
HK$2.482
Each (In a Tube of 100)
units
General Purpose Surface Mount DMP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 5 x 5 x 1.6mm 5mm 5mm 1.6mm -
RS Stock No. 713-9405
Mfr. Part No.NJM2903RB1-TE1
HK$5.188
Each (In a Pack of 5)
units
General Purpose Surface Mount TVSP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 2.9 x 2.8 x 0.85mm 2.9mm 2.8mm 0.85mm -
RS Stock No. 178-2403
Mfr. Part No.NJM2403M
HK$2.416
Each (In a Tube of 100)
units
General Purpose Surface Mount DMP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 5 x 5 x 1.6mm 5mm 5mm 1.6mm -
RS Stock No. 740-5272
Mfr. Part No.NJM2407R-TE1
HK$3.792
Each (In a Pack of 5)
units
General Purpose Surface Mount VSP Dual, Single Open Collector/Emitter 2 0.8µs 8 3 → 18 V 2.9 x 2.8 x 1.1mm 2.9mm 2.8mm 1.1mm -
RS Stock No. 169-8167
Mfr. Part No.NJM2903V-TE1
HK$1.798
Each (On a Reel of 2000)
units
General Purpose Surface Mount SSOP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 3.5 x 4.4 x 1.15mm 3.5mm 4.4mm 1.15mm -
RS Stock No. 178-2404
Mfr. Part No.NJM311M
HK$2.822
Each (In a Tube of 100)
units
General Purpose Surface Mount DMP Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 5 x 5 x 1.6mm 5mm 5mm 1.6mm -
RS Stock No. 178-2322
Mfr. Part No.NJM12903D
HK$1.906
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Single Open Collector 2 0.5µs 8 3 → 12 V 8.8 x 6.4 x 3.4mm 8.8mm 6.4mm 3.4mm -
RS Stock No. 740-5083
Mfr. Part No.NJM12903V-TE1
HK$4.90
Each (In a Pack of 5)
units
General Purpose Surface Mount SSOP Single Open Collector 2 0.5µs 8 3 → 12 V 3.5 x 4.4 x 1.15mm 3.5mm 4.4mm 1.15mm -
RS Stock No. 178-2301
Mfr. Part No.NJM311D
HK$3.146
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 8.8 x 6.4 x 3.4mm 8.8mm 6.4mm 3.4mm -
RS Stock No. 178-2436
Mfr. Part No.NJU7116F-TE1
HK$4.023
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Single Push-Pull 1 - 5 3 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 50dB
RS Stock No. 178-2432
Mfr. Part No.NJM2406F-TE1
HK$1.588
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Single Open Collector 1 1.5µs 5 3 V, 5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm -
RS Stock No. 178-2407
Mfr. Part No.NJM2901M
HK$3.163
Each (In a Tube of 100)
units
General Purpose Surface Mount DMP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 10 x 5 x 1.6mm 10mm 5mm 1.6mm -
RS Stock No. 178-2435
Mfr. Part No.NJU7141F-TE1
HK$3.07
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Single Open Drain 1 - 5 3 V, 5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 55dB
RS Stock No. 178-2323
Mfr. Part No.NJU7102AD
HK$14.947
Each (In a Tube of 50)
units
Low Power Through Hole PDIP Single Push-Pull 2 - 8 5 → 9 V 8.8 x 6.4 x 3.4mm 8.8mm 6.4mm 3.4mm 82dB
RS Stock No. 713-9414
Mfr. Part No.NJM2903V-TE1
HK$4.894
Each (In a Pack of 5)
units
General Purpose Surface Mount SSOP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 3.5 x 4.4 x 1.15mm 3.5mm 4.4mm 1.15mm -
RS Stock No. 169-8166
Mfr. Part No.NJM2901V-TE1
HK$3.596
Each (On a Reel of 2000)
units
General Purpose Surface Mount SSOP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm -
RS Stock No. 169-8165
Mfr. Part No.NJM2903RB1-TE1
HK$3.00
Each (On a Reel of 2000)
units
General Purpose Surface Mount TVSP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 2.9 x 2.8 x 0.85mm 2.9mm 2.8mm 0.85mm -
RS Stock No. 178-2321
Mfr. Part No.NJM2903D
HK$2.766
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 8.8 x 6.4 x 3.4mm 8.8mm 6.4mm 3.4mm -