The LM393MX\/NOPB from Texas Instruments is a dual low-power low-offset voltage comparator in an 8-pin SOIC package. It features a wide supply voltage range of 2 V to 36 V (single or \u00b11 V to \u00b118 V dual), very low supply current of 0.4 mA independent of supply voltage, input common-mode voltage range including ground, low input bias current of 25 nA, maximum offset voltage of \u00b15 mV, open-collector output compatible with TTL\/CMOS, and 1.3 \u00b5s response time. Operating temperature range is 0\u00b0C to 70\u00b0C. Applications include limit comparators, oscillators, voltage detectors, and logic-level translators.<\/p>","protected":false},"excerpt":{"rendered":"
The LM393MX\/NOPB from Texas Instruments is a dual low-power low-offset voltage comparator in an 8-pin SOIC package. It features a wide supply voltage range of 2 V to 36 V (single or \u00b11 V to \u00b118 V dual), very low supply current of 0.4 mA independent of supply voltage, input common-mode voltage range including ground, […]<\/p>\n","protected":false},"author":2,"featured_media":2890,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[19,13],"tags":[],"chip_brand":[138],"class_list":["post-2031","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"Dual comparator, 2-36V, 0.4mA Iq, 5mV Vos, open-collector, SOIC-8, 0~70\u00b0C","date_code":"","package_case":"SOIC-8 (D) (4.9 x 6.0 x 1.75 mm, 1.27mm pitch)","in_stock":25000,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/lm393-n.pdf","price":"$0.23 (1K+ pcs)","product_introduction":"The LM393MX\/NOPB is a dual low-power precision voltage comparator from Texas Instruments, part of the LM193-N series. It contains two independent comparators in a single 8-pin SOIC package, designed to operate from a single 2-V to 36-V supply or dual \u00b11-V to \u00b118-V supplies.\n\nThe defining characteristic of the LM393 is the input common-mode voltage range that includes ground, even when operating from a single positive supply. This allows the comparator to sense signals at or near ground without requiring a negative supply rail \u2014 a critical advantage in single-supply battery-powered and automotive systems.\n\nThe PNP input stage provides low input bias current (25 nA typ) and low input offset current (\u00b15 nA), making the LM393 suitable for high-impedance sensor interfaces. The maximum input offset voltage is \u00b15 mV over temperature, adequate for most threshold detection applications.\n\nThe open-collector output can sink up to 16 mA and is compatible with TTL, DTL, ECL, MOS, and CMOS logic levels. The open-collector architecture enables wired-OR connections and level shifting between different voltage domains. A pull-up resistor to the desired logic supply sets the output high level.\n\nThe supply current is only 0.4 mA for both comparators combined, independent of supply voltage magnitude. This makes the LM393 one of the most power-efficient general-purpose comparators available, ideal for battery-operated equipment.\n\nThe LM393MX\/NOPB is the SOIC-8 tape-and-reel version rated for 0\u00b0C to 70\u00b0C commercial temperature range. The \/NOPB suffix indicates lead-free (Pb-free) RoHS-compliant packaging with Sn lead finish, MSL-1 unlimited floor life.","working_principle":"**PNP Input Stage:** Each comparator uses a PNP differential input pair. The PNP structure allows the input common-mode range to extend to ground (0 V) and slightly below (-0.3 V max), which is the key advantage over NPN-input comparators. The input bias current flows out of the input pins (typically 25 nA), setting a minimum source impedance requirement for accurate threshold detection.\n\n**Open-Collector Output:** The output stage is an NPN open-collector transistor that can only sink current to ground. When the inverting input exceeds the non-inverting input, the output transistor turns on (output low, saturation voltage 250 mV at 4 mA). When the non-inverting input is higher, the output transistor turns off and the output floats high via an external pull-up resistor. This allows the output high level to be set independently from the supply voltage, enabling level shifting.\n\n**Comparison Operation:** The comparator has no internal feedback (unlike an op-amp), so it operates in open loop. Any voltage difference between inputs exceeding the offset voltage drives the output to one rail. The typical response time is 1.3 \u00b5s for a 5-mV overdrive, making it suitable for moderate-speed signal detection.\n\n**Power Supply:** The LM393 operates from a single 2-36V supply or dual \u00b11-18V supplies. The supply current (0.4 mA) is essentially constant across the full voltage range because the internal bias network is self-regulating. There is no quiescent current difference between the two output states.","pin_description":"
| Pin<\/th> | Name<\/th> | Type<\/th> | Description<\/th><\/tr><\/thead> | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1<\/td> | 1OUT<\/td> | O<\/td> | Comparator 1 output; open-collector; requires external pull-up resistor to logic supply; can sink up to 16 mA; saturation voltage 250 mV at 4 mA; compatible with TTL\/CMOS<\/td><\/tr> | ||||||||||||||||||||||||||||||
| 2<\/td> | 1IN-<\/td> | I<\/td> | Comparator 1 inverting input; input bias current 25 nA typ (flows out of pin); common-mode range 0 V to V+\u22121.5 V; differential input range up to 36 V<\/td><\/tr> | ||||||||||||||||||||||||||||||
| 3<\/td> | 1IN+<\/td> | I<\/td> | Comparator 1 non-inverting input; same electrical characteristics as 1IN-<\/td><\/tr> | ||||||||||||||||||||||||||||||
| 4<\/td> | GND<\/td> | P<\/td> | Ground \/ negative supply; connect to system ground for single-supply operation; connect to negative supply for dual-supply operation<\/td><\/tr> | ||||||||||||||||||||||||||||||
| 5<\/td> | 2IN+<\/td> | I<\/td> | Comparator 2 non-inverting input; independent from comparator 1<\/td><\/tr> | ||||||||||||||||||||||||||||||
| 6<\/td> | 2IN-<\/td> | I<\/td> | Comparator 2 inverting input; independent from comparator 1<\/td><\/tr> | ||||||||||||||||||||||||||||||
| 7<\/td> | 2OUT<\/td> | O<\/td> | Comparator 2 output; open-collector; same characteristics as 1OUT<\/td><\/tr> | ||||||||||||||||||||||||||||||
| 8<\/td> | V+<\/td> | P<\/td> | Positive supply; 2 V to 36 V; bypass with 0.1 \u00b5F ceramic placed close to pin; supply current 0.4 mA typ (both comparators)<\/td><\/tr><\/tbody><\/table>","application_scenarios":"
|