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. 714-0754
Mfr. Part No.LM2903DT
PHP10.908
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS Stock No. 178-7406
Mfr. Part No.LM2903PT
PHP6.025
Each (On a Reel of 4000)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm -
RS Stock No. 178-5160
Mfr. Part No.LM2903DT
PHP5.148
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS Stock No. 795-8394
Mfr. Part No.LM2903PT
PHP8.194
Each (On a Tape of 50)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 4.5 x 3.1 x 1.05mm 4.5mm 3.1mm 1.05mm -
RS Stock No. 145-9204
Mfr. Part No.LM339D
PHP3.885
Each (In a Tube of 50)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 714-0815
Mfr. Part No.LM339DT
PHP10.76
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 165-7717
Mfr. Part No.LM339DT
PHP3.667
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 714-0811
Mfr. Part No.LM339D
PHP9.583
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 168-8624
Mfr. Part No.LM2903WYPT
PHP7.133
Each (On a Reel of 4000)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 4.4 x 3 x 1.05mm 4.4mm 3mm 1.05mm -
RS Stock No. 877-2769
Mfr. Part No.LM393ADT
PHP14.965
Each (In a Pack of 25)
units
Low Power Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 829-4408
Mfr. Part No.LM2903WYPT
PHP8.50
Each (In a Pack of 15)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 4.4 x 3 x 1.05mm 4.4mm 3mm 1.05mm -
RS Stock No. 168-7454
Mfr. Part No.TS3022IDT
PHP56.923
Each (On a Reel of 2500)
units
High Speed Surface Mount SOIC Single Push-Pull 2 0.009µs 8 1.8 → 5 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm 67dB
RS Stock No. 165-5531
Mfr. Part No.LM393ADT
PHP4.847
Each (On a Reel of 2500)
units
Low Power Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS Stock No. 760-9468
Mfr. Part No.TS3022IDT
PHP78.23
Each (In a Pack of 5)
units
High Speed Surface Mount SOIC Single Push-Pull 2 0.009µs 8 1.8 → 5 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm 67dB
RS Stock No. 165-5641
Mfr. Part No.TS882IQ2T
PHP40.109
Each (On a Reel of 3000)
units
Low Power Surface Mount DFN Single Push-Pull 2 - 8 1.1 → 5.5 V 2.15 x 2.15 x 0.55mm 2.15mm 2.15mm 0.55mm 78dB
RS Stock No. 168-7248
Mfr. Part No.LM339PT
PHP4.155
Each (On a Reel of 2500)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
New
RS Stock No. 189-2059
Mfr. Part No.LM239APT
PHP22.80
Each (In a Pack of 25)
units
Low Power Surface Mount TSSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 4 1.3µs 14 2 → 32 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
New
RS Stock No. 189-1854
Mfr. Part No.LM293QT
PHP6.744
Each (On a Reel of 3000)
units
Low Power Surface Mount DFN Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 2.05 x 2.05 x 0.7mm 2.05mm 2.05mm 0.7mm -
New
RS Stock No. 189-1851
Mfr. Part No.LM2903Q2T
PHP5.874
Each (On a Reel of 3000)
units
Low Power Surface Mount DFN Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 2.05 x 2.05 x 0.7mm 2.05mm 2.05mm 0.7mm -
RS Stock No. 917-0760
Mfr. Part No.TS861ILT
PHP33.71
Each (In a Pack of 10)
units
Dual CMOS, Rail to Rail Surface Mount SOT-23 Single Push-Pull 1 500ns 5 2.7 → 10 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 70dB