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. 168-4869
Mfr. Part No.LM2901DR
HK$0.872
Each (On a Reel of 2500)
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. 517-2368
Mfr. Part No.LM2901D
HK$3.028
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. 121-8305
Mfr. Part No.LM311P
HK$3.409
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. 661-2836
Mfr. Part No.LP339N
HK$4.56
Each (In a Pack of 10)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 8µs 14 5 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS Stock No. 122-3374
Mfr. Part No.AS331KTR-G1
HK$0.828
Each (On a Reel of 3000)
units
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS Stock No. 922-3287
Mfr. Part No.TLV3502AIDCNT
HK$22.692
Each (On a Reel of 250)
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. 121-8934
Mfr. Part No.TLV3501AID
HK$22.353
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. 920-6361
Mfr. Part No.TS391ILT
HK$1.634
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. 145-7305
Mfr. Part No.LM2901D
HK$2.793
Each (In a Tube of 50)
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. 121-9350
Mfr. Part No.TPS3700DDCT
HK$10.004
Each (On a Reel of 250)
units
- Surface Mount TSOT-23 - - - - 6 - 3.05 x 1.75 x 1mm 3.05mm 1.75mm 1mm -
RS Stock No. 160-3349
Mfr. Part No.AD8468WBKSZ-R7
HK$11.315
Each (On a Reel of 3000)
units
Low Power Surface Mount SC-70 Single CMOS, Rail to Rail, TTL 1 45ns 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 45dB
RS Stock No. 145-9203
Mfr. Part No.LM239D
HK$2.689
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. 536-1344
Mfr. Part No.LM339M/NOPB
HK$8.21
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. 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. 828-7539
Mfr. Part No.AS331KTR-G1
HK$0.988
Each (In a Pack of 50)
units
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS Stock No. 528-353
Mfr. Part No.LM2903DR
HK$2.242
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. 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. 809-9253
Mfr. Part No.AD8468WBKSZ-R7
HK$19.08
Each (On a Tape of 5)
units
Low Power Surface Mount SC-70 Single CMOS, Rail to Rail, TTL 1 45ns 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 45dB
RS Stock No. 877-2762
Mfr. Part No.LM393ST
HK$2.719
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. 178-4707
Mfr. Part No.LM339NG
HK$4.93
Each (In a Tube of 25)
units
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
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