Comparators

A Comparator is a circuit that accepts two voltages or currents and then switches the output showing which of the two is bigger. Comparators are found in components such as analogue to digital converters (ADCs). Comparators are like operational amplifiers except a comparator is designed specifically 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 either 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 analogue to digital (ADC). Two supply voltages 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
  • Micropower
  • Nano power
  • Precision
  • Push/pull output
  • Quad differential
  • Rail to rail
  • Voltage
  • Window

Mounting Types

Comparators can be found in both surface mount and through-hole mounting configurations to enable use in a wide variety of applications.

Comparator power supply types

Available in both single and dual power supply configurations, a comparator can easily be implemented into a robust solution.

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 805-1365
製造零件編號LM311DR2G
TWD15.20
Each (On a Tape of 25)
單位
General Purpose Surface Mount SOIC Dual, Single CMOS 1 200ns 8 36 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS庫存編號 190-6556
製造零件編號MAX9064EBS+TG45
TWD31.50
/個 (每包:10個)
單位
Nano Power Surface Mount UCSP Single Open Drain, Push-Pull 1 - 4 1 → 5.5 V 1 x 1 x 0.4mm 1mm 1mm 0.4mm -
RS庫存編號 876-7186
製造零件編號MCP6541-I/P
BrandMicrochip
TWD14.30
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 738-7045
製造零件編號MCP6569-E/ST
BrandMicrochip
TWD52.50
/個 (每包:2個)
單位
General Purpose Surface Mount TSSOP Single Open Drain 4 - 14 1.8 to 5.5 V 5.1 x 4.5 x 1.05mm 5.1mm 4.50mm 1.05mm 65dB
RS庫存編號 403-200
製造零件編號MCP6549-I/SL
BrandMicrochip
TWD44.20
/個 (每包:5個)
單位
Low Power Surface Mount SOIC Single Open Drain 4 - 14 3 V, 5 V 8.65 x 3.9 x 1.25mm 8.65mm 3.9mm 1.25mm 70dB
RS庫存編號 709-2043
製造零件編號LM211P
TWD16.20
/個 (每包:20個)
單位
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庫存編號 189-7358
製造零件編號MAX961ESA+
TWD132.60
毎管:100 個
單位
General Purpose Surface Mount SOIC Single Complementary 1 - 8 3 V, 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 80dB
RS庫存編號 190-4355
製造零件編號MAX9031AXK+T
TWD16.70
個 (在毎卷:2500)
單位
Low Power, Micro Power Comparator Surface Mount SC-70 Single Rail to Rail 1 - 5 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 100dB
RS庫存編號 191-3605
製造零件編號MAX9063EUK+T
TWD28.80
/個 (每包:10個)
單位
Nano Power Surface Mount SOT-23 Single Open Drain, Push-Pull 1 - 5 1 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm -
RS庫存編號 713-9405
製造零件編號NJM2903RB1-TE1
TWD14.00
/個 (每包:5個)
單位
General Purpose Surface Mount TVSP Dual, Single Open Collector 2 1.5µs 8 3 → 28 V 2.9 x 2.8 x 0.85mm 2.9mm 2.8mm 0.85mm -
RS庫存編號 190-6487
製造零件編號MAX998EUT+T
TWD140.00
/個 (每包:5個)
單位
Low Power Surface Mount SOT-23 Single Rail to Rail 1 - 6 2.7 → 5.5 V 3 x 1.75 x 1.3mm 3mm 3mm 1.3mm 95dB
RS庫存編號 124-6460
製造零件編號BA8391G-TR
BrandROHM
TWD13.40
/個 (每包:25個)
單位
General Purpose Surface Mount SSOP Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 2.9 x 1.6 x 1.1mm 2.9mm 1.6mm 1.1mm -
RS庫存編號 787-8655
製造零件編號LM393DMR2G
TWD10.10
Each (On a Tape of 20)
單位
General Purpose Surface Mount MSOP Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm -