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庫存編號 158-5242
製造零件編號CMP402GSZ
HK$59.98
毎管:48 個
單位
Low Voltage Surface Mount SOIC Dual, Single - 4 - 16 - 10 x 4 x 1.5mm 10mm 4mm 1.5mm 60dB
RS庫存編號 171-6313
製造零件編號BU7230G-TR
BrandROHM
HK$5.25
/個 (每包:20個)
單位
Low Current CMOS Surface Mount SSOP Dual, Single Open Drain 1 1.8µs 5 1.8 → 5.5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 80dB
RS庫存編號 145-7072
製造零件編號LM2901AVQDRG4
HK$1.885
個 (在毎卷:2500)
單位
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庫存編號 133-3358
製造零件編號LM2901AQS14-13
HK$2.95
/個 (每包:20個)
單位
Quad Differential Surface Mount SO Dual, Single CMOS, MOS, TTL 4 300ns 14 2 → 36 V 8.74 x 3.99 x 1.45mm 8.74mm 3.99mm 1.45mm -
RS庫存編號 661-2854
製造零件編號TLC339IN
HK$13.69
/個 (每包:5個)
單位
Low Power Through Hole PDIP Single Open Drain 4 2.5µs 14 5 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm 84dB
RS庫存編號 162-5601
製造零件編號TLV1391IDBVT
HK$4.975
個 (在毎卷:250)
單位
General Purpose Surface Mount SOT-23 Single Open Collector 1 0.65µs 5 3 V, 5 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS庫存編號 190-6649
製造零件編號MAX985EUK+T
HK$22.742
/個 (每包:5個)
單位
Micro Power Comparator Surface Mount SOT-23 Dual, Single Push-Pull 1 - 5 2.5 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 80dB
RS庫存編號 155-7514
製造零件編號LT6700IS6-3#TRMPBF
HK$21.566
個 (在毎卷:500)
單位
Low Voltage Surface Mount TSOT-23 Single Open Collector 2 2.2µs 6 1.4 → 18 V 2.9 x 1.5 x 0.9mm 2.9mm 1.5mm 0.9mm -
RS庫存編號 709-7193
製造零件編號AD8561ARUZ
HK$38.42
單位
General Purpose Surface Mount TSSOP Dual, Single Complementary 1 - 8 5 V, 9 V 3 x 4.4 x 1.05mm 3mm 4.4mm 1.05mm 85dB
RS庫存編號 829-1532
製造零件編號TS884IQ4T
HK$14.812
/個 (每包:5個)
單位
Low Power Surface Mount QFN Single Push-Pull 4 - 16 1.1 → 5.5 V 3.15 x 3.15 x 0.95mm 3.15mm 3.15mm 0.95mm 78dB
RS庫存編號 178-8810
製造零件編號LM339PW
HK$2.915
毎管:90 個
單位
General Purpose Surface Mount TSSOP Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 5 x 4.4 x 1.15mm 5mm 4.4mm 1.15mm -
RS庫存編號 146-1165
製造零件編號MAX932CPA+
HK$34.23
毎管:50 個
單位
Low Power Through Hole PDIP Dual, Single - 2 12µs 8 3 → 9 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 80dB
RS庫存編號 192-1906
製造零件編號MAX913EPA+
HK$70.735
毎管:50 個
單位
Low Power Through Hole PDIP Single Push-Pull 1 - 8 5 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 110dB
RS庫存編號 145-0395
製造零件編號TLC393CP
HK$9.67
毎管:50 個
單位
Low Power Through Hole PDIP Single Open Drain 2 - 8 5 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm 84dB
RS庫存編號 799-3255
製造零件編號MAX942EPA+
HK$45.95
/個 (每包:2個)
單位
High Speed Through Hole PDIP Single CMOS, TTL 2 - 8 2.7 → 5.5 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 80µV/V
RS庫存編號 155-7568
製造零件編號LT1719IS6#TRMPBF
HK$23.134
個 (在毎卷:500)
單位
High Speed Surface Mount TSOT-23 Single Rail to Rail 1 2.5ns 6 2.7 → 6 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm 65dB
RS庫存編號 876-7186
製造零件編號MCP6541-I/P
BrandMicrochip
HK$3.25
毎管:60 個
單位
Low Power Through Hole PDIP Single Push-Pull 1 - 8 1.6 → 5.5 V 10.16 x 7.11 x 5.33mm 10.16mm 7.11mm 5.33mm 70dB
RS庫存編號 779-9404
製造零件編號LT1720CS8#PBF
HK$60.78
/個 (每包:2個)
單位
General Purpose Surface Mount SOIC Single CMOS, Rail to Rail, TTL 2 - 8 2.7 to 6 V 5.004 x 3.89 x 1.498mm 5mm 3.89mm 1.498mm 70dB
RS庫存編號 190-4369
製造零件編號MAX941CSA+
HK$21.422
毎管:100 個
單位
High Speed, Low Power Surface Mount SO Single - 1 - 8 2.7 → 5.5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 80µV/V
RS庫存編號 190-4394
製造零件編號MAX999EUK+T
HK$34.595
個 (在毎卷:2500)
單位
Ultra High Speed Surface Mount SOT-23 - - - - 5 2.7 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 0.1mV/V