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 534-4260
製造零件編號LMC7211BIM5/NOPB
HK$16.53
單位
General Purpose Surface Mount SOT-23 Single Push-Pull 1 4µs 5 3 → 12 V 2.92 x 1.6 x 1.02mm 2.92mm 1.6mm 1.02mm 75dB
RS庫存編號 923-3454
製造零件編號TLV3501AIDBVT
HK$18.602
個 (在毎卷:250)
單位
General Purpose Surface Mount SOT-23 Single Push-Pull 1 - 6 3 V, 5 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm 70dB
RS庫存編號 185-9057
製造零件編號NCV2250SN2T1G
HK$4.707
/個 (每包:13個)
單位
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS庫存編號 463-155
製造零件編號LM339DG
HK$2.943
/個 (每包:50個)
單位
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 8.75 x 4 x 1.5mm 8.75mm 4mm 1.5mm -
RS庫存編號 179-1592
製造零件編號LM2901M/NOPB
HK$7.908
毎管:55 個
單位
Differential 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庫存編號 799-8323
製造零件編號MAX924ESE+
HK$47.15
單位
Low Voltage Surface Mount SOIC Single Push-Pull 1 12µs 16 2.5 → 11 V 10 x 4 x 1.5mm 10mm 4mm 1.5mm 0.1mV/V
RS庫存編號 131-2778
製造零件編號BU7251G-TR
BrandROHM
HK$8.73
/個 (每包:10個)
單位
High Speed CMOS Surface Mount SSOP Dual, Single Push-Pull 1 0.55µs 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 860-7438
製造零件編號TS332IQ2T
HK$6.11
/個 (每包:10個)
單位
Low Power Surface Mount DFN Single Open Drain 1 - 8 1.6 → 5 V 2.15 x 2.15 x 0.55mm 2.15mm 2.15mm 0.55mm 79dB
RS庫存編號 145-6989
製造零件編號LTC1540CMS8#PBF
HK$24.646
毎管:50 個
單位
Low Power Surface Mount MSOP Dual, Single CMOS, TTL 1 - 8 2 → 11 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm 0.1mV/V
RS庫存編號 534-4715
製造零件編號LMV331M7/NOPB
HK$7.87
單位
General Purpose Surface Mount SC-70 Single Open Collector 1 - 5 3 V 2 x 1.25 x 0.9mm 2mm 1.25mm 0.9mm -
RS庫存編號 760-5788
製造零件編號FAN156L6X
HK$2.94
/個 (每包:25個)
單位
Low Voltage Surface Mount MicroPak Single Push-Pull 1 0.0054µs 6 5.5 V 1.45 x 1 x 0.5mm 1.45mm 1mm 0.5mm 60dB
RS庫存編號 858-0844
製造零件編號LT6700IS6-1#TRMPBF
HK$33.54
/個 (每包:5個)
單位
Low Voltage Surface Mount TSOT-23 Single Open Collector - - 6 18.5 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm -
RS庫存編號 185-8090
製造零件編號NCS2252SN2T1G
HK$1.924
個 (在毎卷:3000)
單位
High Speed Surface Mount TSOP Single Rail to Rail 1 - 5 1.8 → 5.5 V 3.15 x 1.65 x 1mm 3.15mm 1.65mm 1mm 81dB
RS庫存編號 191-4008
製造零件編號MAX991EUA+
HK$18.098
毎管:50 個
單位
- Surface Mount μMAX Dual, Single Rail to Rail 2 - 8 2.5 → 5.5 V 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 80dB
RS庫存編號 178-2435
製造零件編號NJU7141F-TE1
HK$4.473
個 (在毎卷:3000)
單位
General Purpose Surface Mount SOT-23 Single Open Drain 1 - 5 3 V, 5 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm 55dB
RS庫存編號 828-7551
製造零件編號AS393MTR-G1
HK$2.75
/個 (每包:50個)
單位
Low Power Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 2 → 36 V 5.1 x 4 x 1.45mm 5.1mm 4mm 1.45mm -
RS庫存編號 184-8575
製造零件編號BA82903YF-CE2
BrandROHM
HK$5.014
個 (在毎卷:2500)
單位
- Surface Mount SOP Single - 2 1.3µs 8 2 → 36 V 5 x 4.4 x 1.5mm 5mm 4.4mm 1.5mm -
RS庫存編號 761-6166
製造零件編號LMC7211AIM5/NOPB
HK$13.602
/個 (每包:5個)
單位
Low Power Surface Mount SOT-23 Dual Push-Pull 1 4µs 5 - 2.92 x 1.6 x 1.02mm 2.92mm 1.6mm 1.02mm 75dB
RS庫存編號 738-7026
製造零件編號MCP6561RT-E/OT
BrandMicrochip
HK$4.45
/個 (每包:5個)
單位
General Purpose Surface Mount SOT-23 Single Push-Pull 1 0.02µs 5 1.8 to 5.5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 65dB
RS庫存編號 709-7073
製造零件編號AD8214ARMZ
HK$18.14
單位
High Voltage Surface Mount MSOP Single - - - 8 5 → 65 V 3 x 3 x 0.85mm 3mm 3mm 0.85mm -