LM393ST - Dual Open-Collector Comparator | STMicroelectronics
MPN: LM393ST ✓ सक्रियLM393ST अवलोकन
A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state when the non-inverting input exceeds the inverting input, or vice versa. Within the broader semiconductor hierarchy, a comparator belongs to the amplifier and signal-conditioning IC family, where it supports threshold detection, decision-making, and feedback control. Unlike a general-purpose operational amplifier, the LM393ST uses open-collector outputs designed for wired logic, pull-up arrangements, and low-voltage system interfacing.
Each LM393ST channel includes an open-collector output capable of sinking current while remaining in a high-impedance state when inactive. External pull-up resistors establish the high output level, allowing the device to interface with a selected supply voltage and potentially support open-collector bus arrangements. The dual-channel configuration provides two independent comparators in one package, reducing board area when a design requires more than one threshold decision.
The LM393 family is specified for operation from 2 V to 36 V on a single supply, while the STMicroelectronics listing describes rail-to-rail input behavior. This wide supply range accommodates low-voltage control systems as well as industrial environments operating from higher rails. The open-collector outputs and broad input capability make the device useful for monitoring supply rails, detecting sensor crossings, implementing window functions with additional circuitry, and building basic automation-control decisions.
Because the outputs are open collector, every board-level implementation must include suitable pull-up components unless the outputs are connected to another compatible open-collector load. The pull-up voltage should remain within the electrical limits of the connected logic, while the pull-up resistance must balance rise time, power consumption, and output-current capability. Short traces and a common ground reference help prevent comparison errors when sensing small voltage differences.
Use the LM393ST when two independent, general-purpose comparisons are needed in an 8-pin MiniSO design and open-collector interfacing is desirable. Review the manufacturer pin description and electrical limits before final PCB routing, particularly input common-mode range, output sink current, supply sequencing, and exposed thermal behavior.
के लिए ड्रॉप-इन विकल्प LM393ST — समान पैकेज, पिन-टू-पिन संगत। PCB रीवर्क आवश्यक करने वाले भिन्न-पैकेज पार्ट्स शामिल नहीं हैं।
LM393ST
✅ ड्रॉप-इनकीमत के लिए संपर्क करें
डेटाशीट देखें →LM393ST Maximum Ratings और Electrical Characteristics
| Comparator Type | Dual general-purpose voltage comparator |
| Number of Channels | 2 channels |
| आउटपुट प्रकार | Open-collector |
| Input Common-Mode Capability | Rail-to-rail |
| Single-Supply Operating Voltage | 2 V to 36 V |
| Maximum Supply Voltage | 36 V |
| पैकेज | 8-MiniSO |
| पिन काउंट | 8 pins |
| माउंटिंग प्रकार | Surface mount |
| Automotive Qualification | Not applicable |
| RoHS स्थिति | ROHS3 compliant |
LM393ST 8-miniso पिन कॉन्फ़िगरेशन गाइड
LM393ST (8-miniso पैकेज) के लिए पिन कॉन्फ़िगरेशन। इस एनालॉग कंपोनेंट में इनपुट, आउटपुट और पावर सप्लाई पिन हैं। ऑफ़सेट नल, कम्पनसेशन और एनेबल पिन कॉन्फ़िगरेशन के लिए निर्माता डेटाशीट देखें। सिग्नल कंडीशनिंग और एम्प्लीफ़ायर सर्किट के लिए आदर्श।
इसके लिए कोई विस्तृत pinout data उपलब्ध नहीं: LM393ST.
देखें डेटाशीट पूर्ण पिन कॉन्फ़िगरेशन के लिए।
सामान्य अनुप्रयोग
LM393ST के लिए उपयुक्त है 6 अनुप्रयोगs: Industrial Sensor Threshold Detection, Power-Supply Overvoltage Detection, Motor and Actuator Control, Battery Threshold Protection, Automated Equipment Logic, Communications and Network Equipment.
Industrial Sensor Threshold Detection
The LM393ST suits industrial sensor interfaces that require two independent threshold decisions within a compact 8-MiniSO footprint. Each channel can compare a conditioned sensor voltage with a reference, while the open-collector output provides a pulled-down fault event or pulled-high ready state through an external resistor. The 2 V to 36 V single-supply range supports both compact control electronics and higher industrial rails. Design protection around exposed sensor wiring, validate the selected temperature grade, and choose pull-up values that satisfy the required logic rise time without excessive continuous power.
अनुशंसित
Power-Supply Overvoltage Detection
The LM393ST can monitor a divided power rail against a reference and provide an open-collector fault indication when the monitored voltage crosses a defined limit. Its 2 V to 36 V operating range is useful across multiple supply architectures, and rail-to-rail input behavior supports direct sensing near the supply rails when the input limits permit. A fault signal can drive a system shutdown or status latch through a pull-up resistor. Resistor tolerance, input bias effects, and propagation delay determine threshold accuracy, so include those effects in the safety-margin calculation.
अनुशंसित
Motor and Actuator Control
The two channels in the LM393ST can support independent limit decisions in motor, valve, or actuator-control circuits. One channel may monitor a command or feedback signal while the other evaluates a position, speed, or travel limit, producing open-collector events for a controller or driver stage. The 8-MiniSO package keeps the sensing section compact, while the wide single-supply range accommodates industrial control systems. Relay, motor, and actuator transients require external protection because the comparator is intended for signal conditioning and logic-level decisions, not direct high-energy load driving.
अनुशंसित
Battery Threshold Protection
The LM393ST is applicable to battery systems that need early warning when a cell or rail approaches a defined limit. Its family operates from 2 V on a single supply, and the two channels can monitor charge and discharge thresholds without requiring two packages. Open-collector outputs allow pull-ups to the logic rail used by the battery controller. Divider resistance should balance battery drain against input bias error, while the selected resistor and source qualification should be checked for temperature and leakage effects. Accurate protection requires checking the actual cell range against the comparator's input and supply limits.
अनुशंसित
Automated Equipment Logic
The LM393ST can implement discrete limit checks and interlock decisions in automated equipment where two comparator functions are needed close to a connector or control board. Each open-collector output can participate in a wired logic condition, allowing a single fault line to represent several limit states. The dual-channel 8-MiniSO arrangement reduces board area, while the 2 V to 36 V supply range provides design flexibility. For reliable operation, keep sensing traces short, maintain a low-impedance common ground, add filtering for noisy analog inputs, and verify the exact component's absolute maximum ratings against the machine's electrical environment.
अनुशंसित
Communications and Network Equipment
The LM393ST can provide receive-line threshold checks, supply-window detection, or fault qualification in communications equipment. Its two open-collector channels can monitor separate signal or rail conditions, and external pull-ups permit connection to the equipment's internal logic supply. The broad 2 V to 36 V range accommodates cards operating from low-voltage rails through higher industrial supplies. High-speed communications decisions may require a lower-delay comparator, so compare propagation delay before using this general-purpose device for timing-critical line coding. Add filtering and protection at externally accessible connectors.
अनुशंसित
अनुशंसित उत्पादों का सारांश
के लिए इंजीनियरिंग संदर्भ डेटा LM393ST — तुलना, डिज़ाइन मार्गदर्शन और अनुपालन जानकारी।
चयन गाइड
विकल्पों के साथ तुलना
| पैरामीटर | यह उत्पाद | LM393ST |
|---|---|---|
| Package | 8-MiniSO | 8-MiniSO |
| Brand | STMicroelectronics | ROHM Semiconductor |
| Comparator Configuration | Dual general-purpose comparator | Dual general-purpose comparator |
| Output Type | Open-collector | Open-collector |
| Input Common-Mode Capability | Rail-to-rail | Rail-to-rail |
| Number of Channels | 2 channels | 2 channels |
| Mounting Type | Surface mount | Surface mount |
मुख्य विशेषताएँ
- Matched package and comparator configuration (बनामLM393ST from ROHM Semiconductor)
- Broad single-supply operating range (बनामLM393LV from Texas Instruments)
- Two independent general-purpose channels (बनामSingle-channel comparator alternatives)
डिज़ाइन नोट्स
Place the LM393ST close to the signals being compared and provide a low-impedance ground return to minimize differential pickup and ground bounce. Keep the pull-up resistor near the corresponding output so the open-collector node has a short route to its receiver. When either input is connected through long wiring, add series resistance and input filtering at the connector rather than relying on the comparator alone to reject industrial noise.
The open-collector output does not require a dedicated high-voltage output driver, but every output node still needs a pull-up resistor. Choose the resistor to satisfy the receiver's rise-time requirement while keeping continuous dissipation within the resistor's rating. If the pull-up rail differs from the comparator supply, confirm that the resulting output-node voltage remains within the LM393ST's permitted limits.
Do not treat the open-collector output as a push-pull logic output. Without a pull-up, the output remains high-impedance after the sink transistor turns off, which can produce undefined voltage transitions in downstream logic. Also verify the manufacturer's pin map because the LM393ST ordering code is used by multiple manufacturers. Confirm input polarity, output assignments, supply pins, and grounding before fabricating the PCB.
A comparator output transitions when the differential input passes through its offset region, so slow or noisy input crossings can cause repeated output toggling. Keep the input network low impedance and use hysteresis through positive feedback when the application must avoid chatter. Select the hysteresis amplitude with enough margin to exceed input offset and noise while remaining inside the usable common-mode range.
अनुपालन जानकारी
The component catalog identifies the device as ROHS3 compliant. REACH and moisture-sensitivity details are not stated in the catalog excerpts, and no automotive qualification is identified.
