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. 760-9468
Mfr. Part No.TS3022IDT
HK$11.626
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. 168-7454
Mfr. Part No.TS3022IDT
HK$9.285
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. 920-6355
Mfr. Part No.LM319DT
HK$2.041
Each (On a Reel of 2500)
units
High Speed Surface Mount SOIC Single TTL 2 80ns 14 5 → ±15 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 795-8802
Mfr. Part No.LM319DT
HK$5.206
Each (In a Pack of 10)
units
High Speed Surface Mount SOIC Single TTL 2 80ns 14 5 → ±15 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 877-2762
Mfr. Part No.LM393ST
HK$1.988
Each (In a Pack of 25)
units
Low Power Surface Mount MSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 3.2 x 3.1 x 0.95mm 3.2mm 3.1mm 0.95mm -
RS Stock No. 714-0714
Mfr. Part No.LM239D
HK$16.83
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. 168-6423
Mfr. Part No.LM239DT
HK$0.802
Each (On a Reel of 2500)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 168-7734
Mfr. Part No.TS374IDT
HK$3.582
Each (On a Reel of 2500)
units
Low Voltage Surface Mount SOIC Dual, Single CMOS, MOS, TTL 4 200ns 14 3 → 16 V 8.75 x 4 x 1.6mm 8.75mm 4mm 1.6mm -
RS Stock No. 426-203
Mfr. Part No.TS391ILT
HK$3.62
Each (In a Pack of 10)
units
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 0.3µs 5 2 → 36 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm -
RS Stock No. 145-9534
Mfr. Part No.LM393ST
HK$0.873
Each (On a Reel of 4000)
units
Low Power Surface Mount MSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 3.2 x 3.1 x 0.95mm 3.2mm 3.1mm 0.95mm -
RS Stock No. 686-7519
Mfr. Part No.LM239DT
HK$1.771
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS Stock No. 920-6361
Mfr. Part No.TS391ILT
HK$1.518
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. 145-9203
Mfr. Part No.LM239D
HK$0.838
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. 795-9057
Mfr. Part No.TS374IDT
HK$4.738
Each (In a Pack of 10)
units
Low Voltage Surface Mount SOIC Dual, Single CMOS, MOS, TTL 4 200ns 14 3 → 16 V 8.75 x 4 x 1.6mm 8.75mm 4mm 1.6mm -
New
RS Stock No. 189-1843
Mfr. Part No.LM239APT
HK$1.479
Each (On a Reel of 2500)
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. 189-1955
Mfr. Part No.LM2903YPT
HK$3.597
Each (In a Pack of 25)
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. 877-2756
Mfr. Part No.LM311DT
HK$2.254
Each (In a Pack of 25)
units
General Purpose Surface Mount SOIC Dual, Single DTL, RTL, TTL 1 200ns 8 5 V 5 x 4 x 1.65mm 5mm 4mm 1.65mm -
RS Stock No. 178-5160
Mfr. Part No.LM2903DT
HK$0.84
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. 168-6807
Mfr. Part No.LM293D
HK$0.934
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. 178-5167
Mfr. Part No.LM393DT
HK$0.792
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 -