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. 545-4799
Mfr. Part No.LT1016CN8#PBF
$12.58
Each
units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V 10.16 x 6.48 x 3.3mm 10.16mm 6.48mm 3.3mm 96dB
RS Stock No. 153-3393
Mfr. Part No.LT1016CN8#PBF
$7.272
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Complementary 1 - 8 5 V 10.16 x 6.48 x 3.3mm 10.16mm 6.48mm 3.3mm 96dB
RS Stock No. 121-8466
Mfr. Part No.LM2903P
$0.568
Each (In a Tube of 50)
units
Differential Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 810-267
Mfr. Part No.LM2903P
$0.77
Each
units
Differential Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 828-7533
Mfr. Part No.AS339MTR-G1
$0.50
Each (In a Pack of 50)
units
Low Power Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS Stock No. 170-8921
Mfr. Part No.AS339MTR-G1
$0.169
Each (On a Reel of 4000)
units
Low Power Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS Stock No. 810-239
Mfr. Part No.LM393P
$0.64
Each
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 866-0231
Mfr. Part No.LM393P
$0.655
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single CMOS, MOS, Open Collector, TTL 2 1.3µs 8 2 → 36 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 759-9386
Mfr. Part No.LM319MX
$0.812
Each (In a Pack of 10)
units
High Speed Surface Mount SOP Dual, Single Open Collector 2 0.08µs 14 5 V 8.76 x 4.2 x 1.65mm 8.76mm 4.2mm 1.65mm -
RS Stock No. 179-1746
Mfr. Part No.LM393AD
$0.499
Each (In a Tube of 75)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 661-2810
Mfr. Part No.LM393AD
$0.53
Each (In a Pack of 10)
units
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS Stock No. 533-5749
Mfr. Part No.LM319N/NOPB
$4.73
Each
units
High Speed Through Hole MDIP Dual, Single Open Collector 2 0.08µs 14 9 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 145-6595
Mfr. Part No.LM319AM/NOPB
$2.222
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. 761-5628
Mfr. Part No.LM319AM/NOPB
$2.81
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. 166-1860
Mfr. Part No.LM2903N
$0.455
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 2 0.2 μs, 1.4 μs 8 2 → 36 V 9.6 x 6.4 x 3.4mm 9.6mm 6.4mm 3.4mm -
RS Stock No. 169-8573
Mfr. Part No.LM319MX
$0.316
Each (On a Reel of 3000)
units
High Speed Surface Mount SOP Dual, Single Open Collector 2 0.08µs 14 5 V 8.76 x 4.2 x 1.65mm 8.76mm 4.2mm 1.65mm -
RS Stock No. 100-0750
Mfr. Part No.LM339D
$0.589
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. 866-0219
Mfr. Part No.LM311N/NOPB
$1.199
Each (In a Tube of 40)
units
General Purpose Through Hole PDIP Dual, Single DTL, MOS, RTL, TTL 1 200ns 8 5 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm -
RS Stock No. 533-8237
Mfr. Part No.LM339N/NOPB
$1.68
Each
units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 858-411
Mfr. Part No.LM339D
$0.77
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 -
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