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. 779-9394
Mfr. Part No.LT1715CMS#PBF
MYR33.41
Each
units
General Purpose Surface Mount MSOP Single CMOS, Open Collector, Rail to Rail, TTL 2 - 10 2.7 → 12 V 3 x 3 x 0.9984mm 3mm 3mm 0.998mm 70dB
RS Stock No. 145-6604
Mfr. Part No.LT1715CMS#PBF
MYR25.057
Each (In a Tube of 50)
units
General Purpose Surface Mount MSOP Single CMOS, Open Collector, Rail to Rail, TTL 2 - 10 2.7 → 12 V 3 x 3 x 0.9984mm 3mm 3mm 0.998mm 70dB
RS Stock No. 795-9003
Mfr. Part No.TS3702IDT
MYR2.46
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. 168-7728
Mfr. Part No.TS3702IDT
MYR1.042
Each (On a Reel of 2500)
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. 761-5628
Mfr. Part No.LM319AM/NOPB
MYR5.428
Each (In a Pack of 5)
units
High Speed Surface Mount SOIC Dual DTL, RTL, TTL 2 80µs 14 - 8.738 x 3.988 x 1.499mm 8.74mm 3.99mm 1.5mm -
RS Stock No. 145-6595
Mfr. Part No.LM319AM/NOPB
MYR3.877
Each (In a Tube of 55)
units
High Speed Surface Mount SOIC Dual DTL, RTL, TTL 2 80µs 14 - 8.738 x 3.988 x 1.499mm 8.74mm 3.99mm 1.5mm -
RS Stock No. 162-8177
Mfr. Part No.LM193H/NOPB
MYR31.232
Each (In a Box of 500)
units
Differential Through Hole TO-99 Dual, Single Open Collector, Open Drain 2 1.3µs 8 2 → 36 V 9.4 x 4.7mm 9.4mm - 4.7mm -
RS Stock No. 121-8870
Mfr. Part No.LM339M/NOPB
MYR3.335
Each (In a Tube of 55)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 to 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 170-8121
Mfr. Part No.ISL28915FH6Z-T7
BrandIntersil
MYR2.88
Each (On a Reel of 3000)
units
Push-Pull Output Surface Mount SOT-23 Single Push-Pull, Rail to Rail 1 - 6 Maximum of 5.75 V 2.9 x 1.6 x 1.14mm 2.9mm 1.6mm 1.14mm 98dB
RS Stock No. 713-9408
Mfr. Part No.NJM2901V-TE1
MYR2.378
Each (In a Pack of 5)
units
General Purpose Surface Mount SSOP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm -
RS Stock No. 121-8421
Mfr. Part No.LM339N
MYR1.464
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 169-8166
Mfr. Part No.NJM2901V-TE1
MYR2.054
Each (On a Reel of 2000)
units
General Purpose Surface Mount SSOP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm -
RS Stock No. 536-1344
Mfr. Part No.LM339M/NOPB
MYR3.92
Each
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS Stock No. 761-8368
Mfr. Part No.LT1713CMS8#PBF
MYR19.45
Each
units
Low Power Surface Mount MSOP Dual, Single CMOS, TTL 1 0.007µs 8 2.4 → 12 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm 70dB
RS Stock No. 858-411
Mfr. Part No.LM339D
MYR1.91
Each
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -
RS Stock No. 121-8704
Mfr. Part No.LM339N/NOPB
MYR3.202
Each (In a Tube of 25)
units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 to 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 920-0066
Mfr. Part No.LT1711CMS8#PBF
MYR17.566
Each (In a Tube of 50)
units
High Speed Surface Mount MSOP Dual, Single Rail to Rail 1 2ns 8 2.4 → 12 V 3 x 3 x 1.095mm 3mm 3mm 1.095mm 75dB
RS Stock No. 100-0750
Mfr. Part No.LM339D
MYR0.561
Each (In a Tube of 50)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.65 x 3.91 x 1.58mm 8.65mm 3.91mm 1.58mm -
RS Stock No. 822-5840
Mfr. Part No.LT1711CMS8#PBF
MYR21.42
Each (In a Pack of 2)
units
High Speed Surface Mount MSOP Dual, Single Rail to Rail 1 2ns 8 2.4 → 12 V 3 x 3 x 1.095mm 3mm 3mm 1.095mm 75dB
RS Stock No. 100-0673
Mfr. Part No.ISL28915FH6Z-T7
BrandIntersil
MYR4.01
Each (In a Pack of 10)
units
Push-Pull Output Surface Mount SOT-23 Single Push-Pull, Rail to Rail 1 - 6 Maximum of 5.75 V 2.9 x 1.6 x 1.14mm 2.9mm 1.6mm 1.14mm 98dB
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