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. 648-9459
Mfr. Part No.LP339N/NOPB
HK$9.41
Each
units
General Purpose Through Hole MDIP Dual, Single Open Collector 4 8µs 14 3 → 28 V 19.05 x 6.35 x 3.3mm 19.05mm 6.35mm 3.3mm -
RS Stock No. 661-2656
Mfr. Part No.TL3016IDR
HK$23.618
Each (In a Pack of 5)
units
General Purpose Surface Mount SOIC Dual, Single Complementary 1 - 8 5 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 97dB
RS Stock No. 517-2374
Mfr. Part No.LM2903D
HK$2.998
Each (In a Pack of 20)
units
Differential 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. 545-5174
Mfr. Part No.LT1016CS8#PBF
HK$68.22
Each
units
General Purpose Surface Mount SOIC Dual, Single Complementary 1 - 8 5 V 5 x 3.99 x 1.48mm 5mm 3.99mm 1.48mm 96dB
RS Stock No. 528-365
Mfr. Part No.LM2901DR
HK$2.719
Each (In a Pack of 25)
units
Differential 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. 517-1810
Mfr. Part No.LM239D
HK$2.385
Each (In a Pack of 20)
units
Differential 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. 121-8671
Mfr. Part No.LM2903D
HK$3.447
Each (In a Tube of 75)
units
Differential 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. 428-458
Mfr. Part No.LM311P
HK$4.68
Each
units
General Purpose Through Hole PDIP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 426-203
Mfr. Part No.TS391ILT
HK$4.614
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. 121-8305
Mfr. Part No.LM311P
HK$3.921
Each (In a Tube of 50)
units
General Purpose Through Hole PDIP Dual, Single Open Collector/Emitter 1 0.165µs 8 5 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS Stock No. 121-8934
Mfr. Part No.TLV3501AID
HK$27.871
Each (In a Tube of 75)
units
High Speed Surface Mount SOIC Single Push-Pull 1 - 8 3 V, 5 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 70dB
RS Stock No. 528-353
Mfr. Part No.LM2903DR
HK$2.431
Each (In a Pack of 25)
units
Differential 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. 168-6423
Mfr. Part No.LM239DT
HK$0.903
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. 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. 162-5066
Mfr. Part No.LM2903QDRQ1
HK$1.586
Each (On a Reel of 2500)
units
Differential 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. 661-2735
Mfr. Part No.TLV3502AIDCNT
HK$40.97
Each
units
General Purpose Surface Mount SOT-23 Single Push-Pull 2 - 8 3 V, 5 V 2.9 x 1.63 x 1.1mm 2.9mm 1.63mm 1.1mm 70dB
RS Stock No. 145-9534
Mfr. Part No.LM393ST
HK$1.105
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. 661-2668
Mfr. Part No.TL331IDBVR
HK$4.11
Each (In a Pack of 10)
units
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 3 → 28 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS Stock No. 920-6361
Mfr. Part No.TS391ILT
HK$2.037
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. 195-082
Mfr. Part No.AD790JRZ
HK$89.72
Each
units
General Purpose Surface Mount SOIC Dual, Single TTL 1 - 8 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 95dB
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