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. 121-8704
Mfr. Part No.LM339N/NOPB
£0.777
Each (In a Tube of 25)
Units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 to 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 533-8237
Mfr. Part No.LM339N/NOPB
£0.92
Each
Units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 527-198
Mfr. Part No.LM339N
£0.267
Each (In a Pack of 25)
Units
General Purpose 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. 121-8421
Mfr. Part No.LM339N
£0.267
Each (In a Tube of 25)
Units
General Purpose 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. 121-8871
Mfr. Part No.LM393M/NOPB
£0.736
Each (In a Tube of 95)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 to 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 536-1388
Mfr. Part No.LM393M/NOPB
£0.65
Each
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 124-4530
Mfr. Part No.LM393N/NOPB
£0.587
Each (In a Pack of 10)
Units
Dual Voltage Comparator Through Hole PDIP Dual, Single Single Ended 1 1.3µs 8 2 → 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 121-8772
Mfr. Part No.LM393N/NOPB
£0.587
Each (In a Tube of 40)
Units
General Purpose Through Hole MDIP Dual, Single Open Collector 2 1.3µs 8 3 to 28 V 9.27 x 6.35 x 3.3mm 9.27mm 6.35mm 3.3mm -
RS Stock No. 536-1287
Mfr. Part No.LM311M/NOPB
£1.13
Each
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 121-8868
Mfr. Part No.LM311M/NOPB
£0.964
Each (In a Tube of 95)
Units
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 to 28 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS Stock No. 866-0219
Mfr. Part No.LM311N/NOPB
£0.552
Each (In a Tube of 40)
Units
General Purpose Through Hole PDIP Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 124-4526
Mfr. Part No.LM311N/NOPB
£0.552
Each (In a Pack of 10)
Units
Voltage Through Hole PDIP Single Single Ended 1 200ns 8 Maximum of 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 528-343
Mfr. Part No.LM393DR
£0.192
Each (In a Pack of 25)
Units
General Purpose 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. 100-0752
Mfr. Part No.LM393D
£0.235
Each (In a Tube of 75)
Units
General Purpose 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. 858-433
Mfr. Part No.LM393D
£0.31
Each
Units
General Purpose 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. 100-0750
Mfr. Part No.LM339D
£0.232
Each (In a Tube of 50)
Units
General Purpose 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. 810-267
Mfr. Part No.LM2903P
£0.35
Each
Units
Differential Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 858-411
Mfr. Part No.LM339D
£0.31
Each
Units
General Purpose 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. 121-8466
Mfr. Part No.LM2903P
£0.254
Each (In a Tube of 50)
Units
Differential Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 121-8305
Mfr. Part No.LM311P
£0.301
Each (In a Tube of 50)
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 -