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. 917-0760
Mfr. Part No.TS861ILT
$0.78
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
RS Stock No. 168-8973
Mfr. Part No.TS861ILT
$0.758
Each (On a Reel of 3000)
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
RS Stock No. 178-5160
Mfr. Part No.LM2903DT
$0.141
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. 714-0754
Mfr. Part No.LM2903DT
$0.392
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. 795-8394
Mfr. Part No.LM2903PT
$0.132
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. 178-7406
Mfr. Part No.LM2903PT
$0.17
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. 165-5543
Mfr. Part No.TS391IYLT
$0.499
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Dual, Single CMOS, DTL, ECL, TTL 1 1.3 ns/μs, 300 ns/μs 5 ±2 → ±36 V 1.75 x 3 x 1.3mm 1.75mm 3mm 1.3mm -
RS Stock No. 880-5490
Mfr. Part No.TS391IYLT
$0.826
Each (In a Pack of 10)
units
General Purpose Surface Mount SOT-23 Dual, Single CMOS, DTL, ECL, TTL 1 1.3 ns/μs, 300 ns/μs 5 ±2 → ±36 V 1.75 x 3 x 1.3mm 1.75mm 3mm 1.3mm -
RS Stock No. 686-7515
Mfr. Part No.TS393IDT
$0.603
Each (In a Pack of 10)
units
Low Power Surface Mount SOIC Dual, Single Open Drain 2 2.5µs 8 3 → 15 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 71dB
RS Stock No. 168-6422
Mfr. Part No.TS393IDT
$0.362
Each (On a Reel of 2500)
units
Low Power Surface Mount SOIC Dual, Single Open Drain 2 2.5µs 8 3 → 15 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 71dB
RS Stock No. 860-7404
Mfr. Part No.TS881ILT
$1.002
Each (In a Pack of 10)
units
Low Power Surface Mount SOT-23 Single Push-Pull 1 160ns 5 0.85 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 78dB
RS Stock No. 168-8801
Mfr. Part No.TS881ILT
$0.58
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Single Push-Pull 1 160ns 5 0.85 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 78dB
RS Stock No. 760-9468
Mfr. Part No.TS3022IDT
$2.08
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. 860-7407
Mfr. Part No.TSX3702IDT
$0.738
Each (In a Pack of 10)
units
Low Power Surface Mount SOIC Dual, Single Push-Pull 2 2.4µs 8 2.7 → 16 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 90dB
RS Stock No. 795-9003
Mfr. Part No.TS3702IDT
$0.818
Each (In a Pack of 10)
units
Low Power Surface Mount SOIC Dual, Single CMOS, Push-Pull 2 2µs 8 2.7 → 16 V 5 x 4 x 1.65mm 5mm 4mm 1.65mm 82dB
RS Stock No. 714-0815
Mfr. Part No.LM339DT
$0.385
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. 145-9204
Mfr. Part No.LM339D
$0.12
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. 714-7367
Mfr. Part No.LM339ADT
$0.481
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. 686-7528
Mfr. Part No.LM2901PT
$0.306
Each (In a Pack of 25)
units
General Purpose Surface Mount TSSOP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 5 x 4.4 x 1mm 5mm 4.4mm 1mm -
RS Stock No. 426-118
Mfr. Part No.TS3021ICT
$1.58
Each (In a Pack of 5)
units
General Purpose Surface Mount SC-70 Single Push-Pull 1 0.04µs 5 3 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 79dB