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. 145-9606
Mfr. Part No.LM293DT
$0.212
Each (On a Reel of 2500)
units
Low Power 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. 714-0830
Mfr. Part No.LM393D
$0.238
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. 178-5167
Mfr. Part No.LM393DT
$0.148
Each (On a Reel of 2500)
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. 714-0833
Mfr. Part No.LM393DT
$0.524
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. 168-6807
Mfr. Part No.LM293D
$0.194
Each (In a Tube of 100)
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 1.58mm 4.9mm 3.9mm 1.58mm -
RS Stock No. 714-0764
Mfr. Part No.LM293D
$0.286
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 1.58mm 4.9mm 3.9mm 1.58mm -
RS Stock No. 714-0773
Mfr. Part No.LM293DT
$0.273
Each (In a Pack of 20)
units
Low Power 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. 145-9204
Mfr. Part No.LM339D
$0.132
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. 168-7141
Mfr. Part No.TS393CDT
$0.396
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single CMOS, Push-Pull 2 2.5µs 8 2.7 → 16 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 71dB
RS Stock No. 760-9449
Mfr. Part No.TS3011ICT
$1.596
Each (In a Pack of 5)
units
High Speed Surface Mount SC-70 Single Push-Pull 1 8ns 5 2.2 to 5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 74dB
RS Stock No. 178-5160
Mfr. Part No.LM2903DT
$0.155
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. 165-6509
Mfr. Part No.TS334IYDT
$1.243
Each (On a Reel of 2500)
units
Low Voltage Surface Mount SOIC Dual, Single Open Drain 4 - 14 5.5 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm 79dB
New
RS Stock No. 189-1890
Mfr. Part No.TS881ICT
$0.735
Each (On a Reel of 3000)
units
- Surface Mount SC-70 Single Push-Pull 1 - 5 1.1 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 78dB
New
RS Stock No. 189-1852
Mfr. Part No.LM2903YPT
$0.296
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. 877-2740
Mfr. Part No.LM211DT
$0.482
Each (In a Pack of 20)
units
General Purpose Surface Mount SOIC Dual, Single TTL 1 200ns 8 5 V 5 x 4 x 1.65mm 5mm 4mm 1.65mm -
RS Stock No. 795-8458
Mfr. Part No.LM339PT
$0.402
Each (On a Tape of 25)
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. 189-1884
Mfr. Part No.TS334IPT
$0.784
Each (On a Reel of 2500)
units
Low Voltage Surface Mount TSSOP Single Open Drain 4 - 14 1.6 → 5 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm 79dB
RS Stock No. 920-6361
Mfr. Part No.TS391ILT
$0.29
Each (On a Reel of 3000)
units
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 0.3µs 5 3 → 28 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm -
RS Stock No. 714-0754
Mfr. Part No.LM2903DT
$0.431
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 -
New
RS Stock No. 189-1949
Mfr. Part No.LM2902YPT
$0.744
Each (In a Pack of 25)
units
Low Power Surface Mount TSSOP Dual, Single - 4 - 14 3 → 30 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -