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 168-6423
製造零件編號LM239DT
TWD3.00
個 (在毎卷:2500)
單位
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS庫存編號 810-267
製造零件編號LM2903P
TWD20.00
單位
Differential Through Hole PDIP Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 9.81 x 6.35 x 4.57mm 9.81mm 6.35mm 4.57mm -
RS庫存編號 822-9937
製造零件編號LT1721CS#PBF
TWD374.00
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
RS庫存編號 761-8908
製造零件編號LT6703HVIS5-3#TRMPBF
TWD87.00
單位
Low Power Surface Mount TSOT-23 Single Open Collector 1 - 5 1.4 → 18 V 2.9 x 1.75 x 0.9mm 2.9mm 1.75mm 0.9mm -
RS庫存編號 823-7950
製造零件編號MCP6546T-I/OT
BrandMicrochip
TWD12.90
/個 (每包:20個)
單位
Low Power Surface Mount SOT-23 Single Open Drain 1 - 5 1.6 → 5.5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 70dB
RS庫存編號 768-1369
製造零件編號MCP6541UT-E/OT
BrandMicrochip
TWD12.90
/個 (每包:10個)
單位
General Purpose Surface Mount SOT-23 Single Push-Pull 1 - 5 1.6 → 5.5 V 3.1 x 1.8 x 1.3mm 3.1mm 1.8mm 1.3mm 70dB
RS庫存編號 787-8658
製造零件編號LM339DTBR2G
TWD16.30
Each (On a Tape of 20)
單位
General Purpose Surface Mount TSSOP Dual, Single CMOS, TTL 4 1.3µs 14 3 → 36 V 5.1 x 4.5 x 1.05mm 5.1mm 4.5mm 1.05mm -
RS庫存編號 121-9135
製造零件編號TL331IDBVR
TWD8.50
個 (在毎卷:3000)
單位
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 3 to 28 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS庫存編號 601-5777
製造零件編號UPC311C-A
TWD41.00
/個 (每包:5個)
單位
- Through Hole PDIP Dual, Single Open Collector 1 0.2µs 8 9 → 28 V 10.16 x 6.4 x 4.31mm 10.16mm 6.4mm 4.31mm -
RS庫存編號 189-7329
製造零件編號MAX9032AKA+T
TWD22.10
個 (在毎卷:2500)
單位
General Purpose Surface Mount SOT-23 Dual, Single Push-Pull 2 0.02µs 8 2.5 → 5.5 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm 100dB
RS庫存編號 168-6807
製造零件編號LM293D
TWD6.70
毎管:100 個
單位
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V 4.9 x 3.9 x 1.58mm 4.9mm 3.9mm 1.58mm -
RS庫存編號 189-7330
製造零件編號MAX903CSA+
TWD187.90
毎管:100 個
單位
Low Power Surface Mount SOIC Single Push-Pull 1 ±0.008µs 8 5 → 10 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 120µV/V
RS庫存編號 192-2446
製造零件編號MAX9141ESA+
TWD47.70
/個 (每包:10個)
單位
Low Power Surface Mount SOIC Single Push-Pull 1 - 8 2.7 → 5.5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 80µV/V
RS庫存編號 191-3615
製造零件編號MAX9117EXK+T
TWD68.20
/個 (每包:5個)
單位
Nano Power Surface Mount SC-70 Single Push-Pull - - 5 1.6 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 0.5mV/V
RS庫存編號 189-1939
製造零件編號LM2902Q4T
TWD10.20
/個 (每包:25個)
單位
Low Power Surface Mount QFN Dual, Single - 4 - 16 3 → 30 V 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm -
RS庫存編號 190-4362
製造零件編號MAX9109ESA+
TWD38.00
毎管:100 個
單位
Low Power Surface Mount SO Single - 1 - 8 4.5 → 5.5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 50µV/V
RS庫存編號 545-7322
製造零件編號LT1017CN8#PBF
TWD227.00
單位
General Purpose Through Hole PDIP Dual, Single Open Collector 2 - 8 3 → 28 V 10.16 x 6.48 x 3.3mm 10.16mm 6.48mm 3.3mm 115dB
RS庫存編號 920-6355
製造零件編號LM319DT
TWD8.70
個 (在毎卷:2500)
單位
High Speed Surface Mount SOIC Single TTL 2 80ns 14 5 → ±15 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS庫存編號 759-1556
製造零件編號ADCMP608BKSZ-REEL7
TWD68.80
/個 (每包:5個)
單位
High Speed Surface Mount SC-70 Single CMOS, TTL 1 0.035 → 0.06µs 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 45dB
RS庫存編號 168-6808
製造零件編號LM311D
TWD7.30
毎管:100 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 -