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 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 517-2374
製造零件編號LM2903D
HK$2.379
/個 (每包:20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 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 168-4869
製造零件編號LM2901DR
HK$0.753
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 179-1743
製造零件編號TL3016IDR
HK$31.189
毎管:75 個
單位
General Purpose Surface Mount SOIC Dual, Single Complementary 1 - 8 5 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 97dB
RS庫存編號 661-2656
製造零件編號TL3016IDR
HK$19.23
/個 (每包:5個)
單位
General Purpose Surface Mount SOIC Dual, Single Complementary 1 - 8 5 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 97dB
RS庫存編號 714-0714
製造零件編號LM239D
HK$16.83
/個 (每包:20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 160-3349
製造零件編號AD8468WBKSZ-R7
HK$11.315
個 (在毎卷:3000)
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 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 536-1344
製造零件編號LM339M/NOPB
HK$16.02
單位
General Purpose Surface Mount SOIC Dual, Single Open Collector 4 1.3µs 14 3 → 28 V 8.64 x 3.91 x 1.45mm 8.64mm 3.91mm 1.45mm -
RS庫存編號 356-9445
製造零件編號TL3016ID
HK$22.81
單位
General Purpose Surface Mount SOIC Dual, Single Complementary 1 - 8 5 V 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 97dB
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 121-9350
製造零件編號TPS3700DDCT
HK$12.296
個 (在毎卷:250)
單位
- Surface Mount TSOT-23 - - - - 6 - 3.05 x 1.75 x 1mm 3.05mm 1.75mm 1mm -
RS庫存編號 828-7539
製造零件編號AS331KTR-G1
HK$1.039
/個 (每包:50個)
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 179-2068
製造零件編號LM239D
HK$2.378
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 912-7031
製造零件編號AD790JRZ
HK$54.759
毎管:98 個
單位
General Purpose Surface Mount SOIC Dual, Single TTL 1 - 8 5 V 5 x 4 x 1.5mm 5mm 4mm 1.5mm 95dB
RS庫存編號 146-535
製造零件編號MAX941CPA+
BrandMaxim
HK$34.34
單位
General Purpose Through Hole PDIP Single - 1 - 8 3 V, 5 V 9.91 x 7.87 x 4.45mm 9.91mm 7.87mm 4.45mm 81.94dB
RS庫存編號 121-8305
製造零件編號LM311P
HK$4.693
毎管:50 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 121-9135
製造零件編號TL331IDBVR
HK$1.779
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 426-203
製造零件編號TS391ILT
HK$3.62
/個 (每包:10個)
單位
General Purpose Surface Mount SOT-23 Dual, Single Open Collector 1 0.3µs 5 2 → 36 V 3 x 1.75 x 1.3mm 3mm 1.75mm 1.3mm -