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. 166-1847
Mfr. Part No.LM393M
HK$1.088
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. 761-4463
Mfr. Part No.LM393M
HK$2.189
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. 145-5224
Mfr. Part No.LM311DR2G
HK$1.259
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS 1 200ns 8 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 903-4318
Mfr. Part No.LM393MX
HK$1.657
Each (In a Pack of 50)
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. 145-4483
Mfr. Part No.LM393MX
HK$0.794
Each (On a Reel of 3000)
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. 805-1365
Mfr. Part No.LM311DR2G
HK$2.635
Each (On a Tape of 25)
units
General Purpose Surface Mount SOIC Dual, Single CMOS 1 200ns 8 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 903-3696
Mfr. Part No.LM393N
HK$4.797
Each (In a Tube of 50)
units
Differential Through Hole DIP Dual, Single Open Collector 2 1.4µs 8 2 → 36 V 10.15 x 6.35 x 3.3mm 10.15mm 6.35mm 3.3mm -
RS Stock No. 463-666
Mfr. Part No.LM339NG
HK$4.811
Each (In a Pack of 20)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS Stock No. 178-4707
Mfr. Part No.LM339NG
HK$5.35
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS Stock No. 145-4339
Mfr. Part No.LM393AN
HK$7.863
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 0.35 μs, 1.4 μs 8 2 → 36 V 9.6 x 6.4 x 3.4mm 9.6mm 6.4mm 3.4mm -
RS Stock No. 759-9396
Mfr. Part No.LM393AN
HK$8.529
Each (In a Pack of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 0.35 μs, 1.4 μs 8 2 → 36 V 9.6 x 6.4 x 3.4mm 9.6mm 6.4mm 3.4mm -
RS Stock No. 145-3854
Mfr. Part No.LM2901VDR2G
HK$1.329
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, TTL 4 1.3µs 14 3 → 36 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS Stock No. 145-3855
Mfr. Part No.LM239DTBR2G
HK$1.19
Each (On a Reel of 2500)
units
General Purpose Surface Mount TSSOP Dual, Single CMOS, TTL 4 1.3µs 14 3 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
RS Stock No. 806-2823
Mfr. Part No.LM393AM
HK$2.586
Each (In a Tube of 90)
units
General Purpose Surface Mount SOIC Dual, Single Differential 2 1.4µs 8 ±1 → ±18 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 163-2396
Mfr. Part No.LM239DR2G
HK$0.993
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS Stock No. 787-8803
Mfr. Part No.NCS2200AMUT1G
HK$3.094
Each (In a Pack of 10)
units
Low Power Surface Mount UDFN Single Complementary 1 35µs 6 0.85 → 6 V 2 x 2.2 x 0.95mm 2mm 2.2mm 0.95mm 65dB
RS Stock No. 760-5797
Mfr. Part No.FAN256L8X
HK$3.677
Each (On a Tape of 10)
units
Low Voltage Surface Mount MicroPak Single Push-Pull 2 0.0054µs 8 5.5 V 1.6 x 1.6 x 0.5mm 1.6mm 1.6mm 0.5mm 60dB
RS Stock No. 163-0737
Mfr. Part No.NCV2200SN2T1G
HK$5.571
Each (On a Reel of 3000)
units
Low Voltage Surface Mount SOT-23 Single Complementary 1 16ns 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
New
RS Stock No. 185-9089
Mfr. Part No.NCV2252SN2T1G
HK$5.924
Each (In a Pack of 13)
units
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS Stock No. 166-2476
Mfr. Part No.FAN256L8X
HK$2.339
Each (On a Reel of 5000)
units
Low Voltage Surface Mount MicroPak Single Push-Pull 2 0.0054µs 8 5.5 V 1.6 x 1.6 x 0.5mm 1.6mm 1.6mm 0.5mm 60dB