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 189-7340
製造零件編號MAX919EUK+T
HK$7.172
個 (在毎卷:2500)
單位
Low Power 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 661-2955
製造零件編號TLV3502AID
HK$48.66
單位
General Purpose Surface Mount SOIC Single Push-Pull 2 - 8 3 V, 5 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 70dB
RS庫存編號 191-3228
製造零件編號MAX9648AXK+T
HK$7.292
個 (在毎卷:2500)
單位
General Purpose Surface Mount SC-70 Single Open Drain - - 5 1.8 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS庫存編號 162-5392
製造零件編號LMV331IDBVR
HK$2.615
個 (在毎卷:3000)
單位
General Purpose Surface Mount SOT-23 Single Open Collector 1 - 5 3 V, 5 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS庫存編號 534-4737
製造零件編號LMV393M/NOPB
HK$10.69
單位
General Purpose Surface Mount SOIC Single Open Collector 2 - 8 3 V 4.9 x 3.9 x 1.45mm 4.9mm 3.9mm 1.45mm -
RS庫存編號 761-9061
製造零件編號LTC1540CMS8#PBF
HK$42.68
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 651-1714
製造零件編號LMV7271MF/NOPB
HK$13.294
/個 (每包:5個)
單位
Low Power Surface Mount SOT-23 Single Push-Pull 1 - 5 3 V, 5 V 2.92 x 1.6 x 1.02mm 2.92mm 1.6mm 1.02mm 78dB
RS庫存編號 661-2599
製造零件編號LM339ADR
HK$2.909
/個 (每包:10個)
單位
General Purpose 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 822-5698
製造零件編號LT1720CMS8#PBF
HK$69.35
單位
High Speed Surface Mount MSOP Single Rail to Rail 2 2.5ns 8 2.7 → 6 V 3 x 3 x 0.9984mm 3mm 3mm 0.998mm 70dB
RS庫存編號 133-3372
製造零件編號LM2903AQS-13
HK$2.877
/個 (每包:50個)
單位
Dual Surface Mount SO Dual, Single CMOS, MOS, TTL 2 300ns 8 2 → 36 V 4.495 x 3.95 x 1.5mm 4.5mm 3.95mm 1.5mm -
RS庫存編號 669-6275
製造零件編號MCP6562-E/SN
BrandMicrochip
HK$6.668
/個 (每包:5個)
單位
General Purpose Surface Mount SOIC Single Push-Pull 2 - 8 3 V, 5 V 4.9 x 3.9 x 1.25mm 4.9mm 3.9mm 1.25mm 66dB
RS庫存編號 191-3615
製造零件編號MAX9117EXK+T
HK$18.06
/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 774-1284
製造零件編號TLV3201AIDCKT
HK$14.47
個 (以毎袋:5)
單位
Low Power Surface Mount SC-70 Single Push-Pull 1 - 5 2.7 → 5.5 V 2.15 x 1.4 x 1mm 2.15mm 1.4mm 1mm 70dB
RS庫存編號 807-1710
製造零件編號ADCMP573BCPZ-WP
HK$182.57
單位
High Speed Surface Mount LFCSP VQ Single Complementary 1 - 16 3.1 → 5.4 V 3 x 3 x 0.95mm 3mm 3mm 0.95mm 65dB
RS庫存編號 145-5839
製造零件編號LM339APW
HK$3.337
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 190-6568
製造零件編號MAX9064EUK+T
HK$9.825
/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 170-2065
製造零件編號LM211D
HK$0.883
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 185-9083
製造零件編號NCS2252SN2T1G
HK$3.769
/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 171-6247
製造零件編號BU5265HFV-TR
BrandROHM
HK$5.019
/個 (每包:25個)
單位
Push-Pull Output Surface Mount HVSOF Dual, Single Push-Pull 1 0.5µs 5 1.8 → 5.5 V 1.6 x 1.2 x 0.58mm 1.6mm 1.2mm 0.58mm 80dB
RS庫存編號 538-4965
製造零件編號ADCMP561BRQZ
HK$56.69
單位
General Purpose Surface Mount QSOP Dual Complementary 2 - 16 - 5 x 3.91 x 1.65mm 5mm 3.91mm 1.65mm 80dB