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 787-8611
製造零件編號LM2903VDG
TWD14.10
/個 (每包:14個)
單位
General Purpose Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS庫存編號 162-9577
製造零件編號NCV2903DR2G
TWD4.20
個 (在毎卷:2500)
單位
General Purpose Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS庫存編號 163-2420
製造零件編號LM393DR2G
TWD3.40
個 (在毎卷:2500)
單位
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS庫存編號 787-8658
製造零件編號LM339DTBR2G
TWD13.30
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 689-9727
製造零件編號LM393DR2G
TWD20.00
/個 (每包:5個)
單位
General Purpose Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS庫存編號 178-4707
製造零件編號LM339NG
TWD19.60
毎管:25 個
單位
General Purpose Through Hole PDIP Dual, Single Open Collector 4 1.3µs 14 5 → 28 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS庫存編號 787-8829
製造零件編號NCV2903DR2G
TWD11.90
Each (On a Tape of 20)
單位
General Purpose Surface Mount SOIC Dual, Single CMOS, DTL, ECL, MOS, TTL 2 1.5µs 8 2 → 36 V dc 5 x 4 x 1.5mm 5mm 4mm 1.5mm -
RS庫存編號 162-9353
製造零件編號LM339DTBR2G
TWD4.70
個 (在毎卷:2500)
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 920-9859
製造零件編號NCS2202AMUTBG
TWD20.60
/個 (每包:5個)
單位
Low Power Surface Mount UDFN Single Open Drain 1 - 6 0.85 → 6 V 1.2 x 1 x 0.5mm 1.2mm 1mm 0.5mm 80dB
RS庫存編號 671-0258
製造零件編號KA2803B
TWD21.40
/個 (每包:5個)
單位
General Purpose Through Hole PDIP - - - - 8 - 10.15 x 6.35 x 3.3mm 10.15mm 6.35mm 3.3mm -
RS庫存編號 121-6493
製造零件編號NCS2200SN1T1G
TWD10.20
個 (在毎卷:3000)
單位
Low Power Surface Mount SOT-23 Single Rail to Rail 1 - 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS庫存編號 774-3470
製造零件編號LM2901NG
TWD11.30
/個 (每包:10個)
單位
General Purpose Through Hole PDIP Dual, Single CMOS, TTL 4 1.3µs 14 36 V 19.56 x 6.6 x 3.68mm 19.56mm 6.6mm 3.68mm -
RS庫存編號 185-9024
製造零件編號NCS2250SN2T1G
TWD13.50
/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 185-9057
製造零件編號NCV2250SN2T1G
TWD15.80
/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 805-7231
製造零件編號NCV2200SN2T1G
TWD30.30
/個 (每包:10個)
單位
Low Power Surface Mount SOT-23 Single Complementary 1 16ns 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB
RS庫存編號 145-4758
製造零件編號LMV331SQ3T2G
TWD4.00
個 (在毎卷:3000)
單位
General Purpose Surface Mount SC-70 Single Open Drain 1 - 5 2.7 → 5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS庫存編號 787-8686
製造零件編號LMV331SQ3T2G
TWD11.30
Each (On a Tape of 20)
單位
General Purpose Surface Mount SC-70 Single Open Drain 1 - 5 2.7 → 5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm -
RS庫存編號 121-6405
製造零件編號NCS2200AMUT1G
TWD7.40
個 (在毎卷:3000)
單位
Low Power Surface Mount UDFN Single Complementary 1 35µs 6 0.85 → 6 V 2 x 2.2 x 0.95mm 2mm 2.2mm 0.95mm 65dB
RS庫存編號 760-5788
製造零件編號FAN156L6X
TWD14.70
/個 (每包:25個)
單位
Low Power 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 787-8807
製造零件編號NCS2200SN2T1G
TWD24.90
Each (On a Tape of 10)
單位
Low Power Surface Mount SOT-23 Single Complementary 1 35µs 5 0.85 → 6 V 3 x 1.5 x 1mm 3mm 1.5mm 1mm 65dB