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 686-7519
製造零件編號LM239DT
HK$1.771
/個 (每包:25個)
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 168-4868
製造零件編號TL331IDBVT
HK$3.63
個 (在毎卷:250)
單位
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 3 → 28 V 2.9 x 1.6 x 1.15mm 2.9mm 1.6mm 1.15mm -
RS庫存編號 145-9203
製造零件編號LM239D
HK$0.838
毎管:50 個
單位
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 4 1.3µs 14 2 → 36 V 8.75 x 4 x 1.65mm 8.75mm 4mm 1.65mm -
RS庫存編號 795-9057
製造零件編號TS374IDT
HK$4.738
/個 (每包:10個)
單位
Low Voltage Surface Mount SOIC Dual, Single CMOS, MOS, TTL 4 200ns 14 3 → 16 V 8.75 x 4 x 1.6mm 8.75mm 4mm 1.6mm -
RS庫存編號 661-2836
製造零件編號LP339N
HK$3.851
/個 (每包:10個)
單位
General Purpose Through Hole PDIP Dual, Single Open Collector 4 8µs 14 5 → 28 V 19.3 x 6.35 x 4.57mm 19.3mm 6.35mm 4.57mm -
RS庫存編號 178-4707
製造零件編號LM339NG
HK$5.204
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 660-6711
製造零件編號LM2903QDRQ1
HK$3.106
/個 (每包:10個)
單位
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS庫存編號 122-3374
製造零件編號AS331KTR-G1
HK$0.579
個 (在毎卷:3000)
單位
Low Power Surface Mount SOT-23 Dual, Single Open Collector 1 1.3µs 5 2 → 36 V 3.02 x 1.7 x 1.3mm 3.02mm 1.7mm 1.3mm -
RS庫存編號 809-9253
製造零件編號AD8468WBKSZ-R7
HK$15.468
Each (On a Tape of 5)
單位
Low Power Surface Mount SC-70 Single CMOS, Rail to Rail, TTL 1 45ns 6 2.5 → 5.5 V 2.2 x 1.35 x 1mm 2.2mm 1.35mm 1mm 45dB
RS庫存編號 528-365
製造零件編號LM2901DR
HK$2.114
/個 (每包:25個)
單位
Differential 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 145-7305
製造零件編號LM2901D
HK$1.524
毎管:50 個
單位
Differential 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 165-9457
製造零件編號MAX942EPA+
BrandMaxim
HK$65.617
毎管:50 個
單位
High Speed Through Hole PDIP Single CMOS, TTL 2 - 8 2.7 → 5.5 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 80µV/V
RS庫存編號 528-353
製造零件編號LM2903DR
HK$1.303
/個 (每包:25個)
單位
Differential Surface Mount SOIC Dual, Single Open Collector 2 1.3µs 8 3 → 28 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm -
RS庫存編號 534-4759
製造零件編號LMV393MM/NOPB
HK$14.76
單位
General Purpose Surface Mount MSOP Single Open Collector 2 - 8 3 V 3 x 3 x 0.86mm 3mm 3mm 0.86mm -
RS庫存編號 168-1884
製造零件編號BA2901FV-E2
BrandROHM
HK$3.564
/個 (每包:25個)
單位
- Surface Mount SSOP Dual, Single Open Collector 4 1.3µs 14 36 V 5 x 4.4 x 1.05mm 5mm 4.4mm 1.05mm -
RS庫存編號 178-5160
製造零件編號LM2903DT
HK$0.84
個 (在毎卷:2500)
單位
General Purpose Surface Mount SOIC Dual, Single CMOS, DL, ECL, MOS, TTL 2 1.3µs 8 2 → 36 V 5 x 4 x 1.25mm 5mm 4mm 1.25mm -
RS庫存編號 661-2921
製造零件編號TLV3401ID
HK$16.742
/個 (每包:5個)
單位
Low Power Surface Mount SOIC Dual, Single Open Drain 1 - 8 3 → 15 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 88dB
RS庫存編號 880-5490
製造零件編號TS391IYLT
HK$5.741
/個 (每包:10個)
單位
General Purpose Surface Mount SOT-23 Dual, Single CMOS, DTL, ECL, TTL 1 1.3 ns/μs, 300 ns/μs 5 ±2 → ±36 V 1.75 x 3 x 1.3mm 1.75mm 3mm 1.3mm -
RS庫存編號 145-7072
製造零件編號LM2901AVQDRG4
HK$2.009
個 (在毎卷:2500)
單位
Differential 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 761-9783
製造零件編號MAX9142ESA+T
BrandMaxim
HK$28.318
Each (On a Tape of 5)
單位
Low Power Surface Mount SOIC Dual Push-Pull 2 - 8 - 5 x 4 x 1.5mm 5mm 4mm 4mm 80µV/V