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. 858-411
Mfr. Part No.LM339D
TWD19.00
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. 121-8869
Mfr. Part No.LM319M/NOPB
TWD52.80
Each (In a Tube of 55)
units
High Speed Surface Mount SOIC Dual, Single Open Collector 2 0.08µs 14 9 → 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 920-3475
Mfr. Part No.LM311D
TWD15.70
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. 796-7997
Mfr. Part No.LM111JG
TWD650.00
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. 528-157
Mfr. Part No.LM311DR
TWD9.00
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. 714-0833
Mfr. Part No.LM393DT
TWD11.40
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS Stock No. 153-3393
Mfr. Part No.LT1016CN8#PBF
TWD144.90
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V 10.16 x 6.48 x 3.3mm 10.16mm 6.48mm 3.3mm 96dB
RS Stock No. 714-0830
Mfr. Part No.LM393D
TWD10.00
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS Stock No. 536-1344
Mfr. Part No.LM339M/NOPB
TWD35.00
Each
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 121-8870
Mfr. Part No.LM339M/NOPB
TWD31.60
Each (In a Tube of 55)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 to 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 810-239
Mfr. Part No.LM393P
TWD12.00
Each
units
General Purpose 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. 100-0750
Mfr. Part No.LM339D
TWD4.00
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. 536-1300
Mfr. Part No.LM319M/NOPB
TWD48.00
Each
units
High Speed Surface Mount SOIC Dual, Single Open Collector 2 0.08µs 14 9 → 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 922-2350
Mfr. Part No.LM111JG
TWD706.30
Each (In a Tube of 13)
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. 866-0231
Mfr. Part No.LM393P
TWD6.20
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single CMOS, MOS, Open Collector, TTL 2 1.3µs 8 2 → 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 545-4799
Mfr. Part No.LT1016CN8#PBF
TWD258.00
Each
units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V 10.16 x 6.48 x 3.3mm 10.16mm 6.48mm 3.3mm 96dB
RS Stock No. 159-8141
Mfr. Part No.ADCMP604BKSZ-R2
TWD154.70
Each (On a Reel of 250)
units
High Speed Surface Mount SC-70 Single LVDS 1 0.003µs 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 50dB
RS Stock No. 145-5720
Mfr. Part No.TLC3704CN
TWD45.40
Each (In a Tube of 25)
units
Low Power Through Hole PDIP Single Push-Pull 4 2.7µs 14 5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm 84dB
RS Stock No. 145-6064
Mfr. Part No.TLV3202AIDGK
TWD49.80
Each (In a Tube of 80)
units
Low Power Surface Mount MSOP Single Push-Pull 1 2.9ns 8 2.7 → 5.5 V 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 70dB
RS Stock No. 812-4047
Mfr. Part No.TLV3202AIDGK
TWD49.80
Each (In a Pack of 10)
units
Low Power Surface Mount MSOP Single Push-Pull 1 2.9ns 8 2.7 → 5.5 V 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 70dB