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
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RS庫存編號 190-4366
製造零件編號MAX921CSA+
BrandMaxim
HK$31.025
毎管:100 個
單位
- Surface Mount SO Dual, Single - 1 14µs 8 2.5 → 11 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 0.2mV/V
RS庫存編號 165-3304
製造零件編號MCP65R46T-1202E/CHY
BrandMicrochip
HK$2.897
個 (在毎卷:3000)
單位
General Purpose Surface Mount SOT-23 Single Open Drain 1 0.85µs 6 1.8 → 5.5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 70dB
RS庫存編號 162-7722
製造零件編號LMC6772BIN/NOPB
HK$17.873
毎管:40 個
單位
Low Power Through Hole PDIP Single Open Drain 2 0.3µs 8 2.7 → 15 V 10.16 x 6.6 x 4.57mm 10.16mm 6.6mm 4.57mm 82dB
RS庫存編號 165-5531
製造零件編號LM393ADT
HK$0.666
個 (在毎卷:2500)
單位
Low Power Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS庫存編號 622-9263
製造零件編號MAX985EUK+
BrandMaxim
HK$30.03
單位
Low Voltage Surface Mount SOT-23 Dual, Single Push-Pull 1 - 5 3 V, 5 V 2.9 x 1.63 x 1.1mm 2.9mm 1.63mm 1.1mm 80dB
RS庫存編號 145-5839
製造零件編號LM339APW
HK$1.734
毎管:90 個
單位
General Purpose Surface Mount TSSOP Dual, Single CMOS, MOS, TTL 4 1.3µs 14 2 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
RS庫存編號 732-7197
製造零件編號MAX919EUK+T
BrandMaxim
HK$12.93
單位
Low Voltage Surface Mount SOT-23 Single Push-Pull 1 6µs 5 1.8 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 0.5mV/V
RS庫存編號 738-5339
製造零件編號APX393M8G-13
HK$2.912
/個 (每包:25個)
單位
General Purpose Surface Mount MSOP Single Open Drain 2 - 8 2.5 → 5.5 V 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm -
RS庫存編號 171-5806
製造零件編號BA2903YFVM-CTR
BrandROHM
HK$2.74
個 (在毎卷:3000)
單位
- Surface Mount MSOP Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 2.9 x 2.8 x 0.75mm 2.9mm 2.8mm 0.75mm -
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RS庫存編號 192-2425
製造零件編號MAX941CPA+
BrandMaxim
HK$38.26
/個 (每包:2個)
單位
General Purpose Through Hole PDIP Single - 1 - 8 3 V, 5 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 81.94dB
RS庫存編號 170-2065
製造零件編號LM211D
HK$1.215
毎管:75 個
單位
General Purpose Surface Mount SOIC Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS庫存編號 160-2622
製造零件編號ADCMP370AKSZ-REEL7
HK$3.524
個 (在毎卷:3000)
單位
General Purpose Surface Mount SC-70 Single Push-Pull 1 30 ns, 45 ns 5 2.25 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS庫存編號 687-8395
製造零件編號MCP6561T-E/OT
BrandMicrochip
HK$4.45
單位
General Purpose Surface Mount SOT-23 Single Push-Pull 1 - 5 3 V, 5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 66dB
RS庫存編號 714-0773
製造零件編號LM293DT
HK$1.537
/個 (每包:20個)
單位
Low Power Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm -
RS庫存編號 732-8116
製造零件編號MAX9142ESA+
BrandMaxim
HK$18.14
單位
Low Power Surface Mount SOIC Single Push-Pull 2 - 8 2.7 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 80µV/V
RS庫存編號 799-8298
製造零件編號MAX9201ESE+
BrandMaxim
HK$36.56
單位
High Speed, Low Power Surface Mount SOIC Single Push-Pull 1 7ns 16 4.75 → 10.5 V 10 x 4 x 1.5mm 10mm 4mm 1.5mm 50µV/V
RS庫存編號 923-3694
製造零件編號TLC372QDR
HK$4.291
個 (在毎卷:2500)
單位
General Purpose Surface Mount SOIC Dual, Single Open Drain 2 0.65µs 8 5 → 15 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS庫存編號 639-6868
製造零件編號TC75S58FU(TE85L,F)
BrandToshiba
HK$3.662
/個 (每包:10個)
單位
General Purpose Surface Mount SSOP Dual, Single Open Drain 1 0.19µs 5 3 V, 5 V 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm -
RS庫存編號 760-5797
製造零件編號FAN256L8X
HK$3.677
Each (On a Tape of 10)
單位
Low Voltage Surface Mount MicroPak Single Push-Pull 2 0.0054µs 8 5.5 V 1.6 x 1.6 x 0.5mm 1.6mm 1.6mm 0.5mm 60dB
RS庫存編號 822-9937
製造零件編號LT1721CS#PBF
HK$68.06
單位
Low Power Surface Mount SOIC Single Rail to Rail, Swing 4 2.5ns 16 2.7 → 6 V 5.004 x 3.988 x 1.498mm 5mm 3.988mm 1.498mm 70dB