LM393AN - Dual Comparator for 5V Control | STMicroelectronics
Артикул: LM393AN ✓ АктивенLM393AN Обзор
A voltage comparator is an analog integrated circuit that compares two input voltages and changes its output state when one input crosses the other. The LM393AN contains two independent comparator channels in one package. Within the broader semiconductor hierarchy, it is a comparator IC, an analog interface device, and part of the integrated-circuit family used for sensing, control, protection, and digital threshold conversion.
The principal feature is its open-collector output architecture, allowing each channel to interface with pull-up resistors and external loads. This architecture is useful in open-drain buses, wired logic, relay-driver stages, and systems where multiple comparators can share a signaling line under suitable conditions. Because the supplied results do not provide complete numerical electrical tables, exact supply voltage, input offset, response time, and current limits require confirmation from the manufacturer datasheet.
The LM393AN is a bipolar general-purpose comparator rather than a rail-to-rail input comparator in the modern CMOS sense, although the distributor listing describes the device as rail-to-rail. Its two channels are electrically independent, allowing one section to monitor a supply threshold while the other evaluates a signal or temperature-derived voltage. The open-collector outputs require external pull-up components when a logic-high output is required.
Typical applications include industrial overvoltage and undervoltage monitoring, sensor threshold detection, battery and power-supply supervision, open-drain interface translation, and control systems comparing an analog input with an adjustable reference. For battery-powered designs, engineers should review the device's supply-current specifications because a classic general-purpose comparator may consume more current than a modern low-power equivalent.
Designers should place the input and output components close to the package pins, use an appropriate pull-up resistor on each open-collector output, and verify the common-mode and supply limits for the selected manufacturer. Input polarity, output sinking current, and propagation delay must be checked before substituting another manufacturer's LM393AN or an LM393-family device.
This page consolidates verified manufacturer and distributor information, identifies source-backed drop-in sourcing options, and adds engineering-focused comparison and application guidance. It is intended to support part selection while clearly separating confirmed package and architecture details from electrical parameters that require the manufacturer datasheet.
Аналоги без доработки для LM393AN — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с LM393AN (тот же форм-фактор и посадочное место) — отличается по Comparator Type, Package.
LM393AN
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Открыть даташит →LM393P
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Открыть даташит →LM393AN Максимальные параметры и электрические характеристики
| Comparator Type | Dual independent precision voltage comparator |
| Number of Comparator Channels | 2 channels |
| Supply Configuration | Single supply or split supply |
| Тип выхода | Open-collector |
| Input Common-Mode Capability | Common-mode range extending to ground in single-supply operation |
| Корпус | 8-DIP |
| Число выводов | 8 pins |
| Тип монтажа | Through-hole |
| Comparator Classification | General-purpose comparator |
Конфигурация выводов LM393AN
| Контакт 1 | OUT1 — Open-collector output of comparator 1 |
| Контакт 2 | IN1- — Inverting input of comparator 1 |
| Контакт 3 | IN1+ — Non-inverting input of comparator 1 |
| Контакт 4 | GND — Ground connection |
| Контакт 5 | IN2+ — Non-inverting input of comparator 2 |
| Контакт 6 | IN2- — Inverting input of comparator 2 |
| Контакт 7 | OUT2 — Open-collector output of comparator 2 |
| Контакт 8 | VCC — Positive supply connection |
Типичное применение
LM393AN подходит для 6 применениеs: Industrial Overvoltage Protection, Battery Supply Monitoring, Sensor Threshold Detection, Power-Supply Sequencing, Open-Drain Interface Translation, Motor and Relay Control.
Industrial Overvoltage Protection
The LM393AN is suitable for threshold-based industrial protection because it provides two independent comparator channels with open-collector outputs in an 8-DIP package. One channel can compare a scaled supply voltage against a reference while the second monitors another rail or fault condition. The open-collector outputs can pull up control or fault lines rather than driving high-current loads directly. Before implementation, verify the selected manufacturer's common-mode range and response timing at the actual operating voltage. Add a pull-up resistor to each used output and account for electrical noise on the sensed node. The design is particularly useful where a discrete protection relay or shutdown latch can be driven from the comparator's sinking output.
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Battery Supply Monitoring
The LM393AN can monitor a battery-derived voltage when one channel compares the divided pack voltage with a reference and the other provides an independent condition or second-threshold check. Its common-mode capability extending toward ground in single-supply operation makes the architecture relevant to low-voltage sensing, while two channels in one 8-DIP reduce component count compared with two separate packages. The open-collector output can directly sink a pull-up-backed indicator or supervisor input. Check minimum supply voltage, input offset, quiescent current, and the battery's operating-temperature range in the exact manufacturer datasheet. Add hysteresis resistors to prevent repeated switching when the measured voltage fluctuates near the threshold.
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Sensor Threshold Detection
The LM393AN fits analog sensor interfaces that require a binary decision rather than a continuously scaled measurement. A sensor output can be compared with a reference in one channel, while the second channel handles a complementary condition or another sensor. The open-collector output provides a useful way to drive an alert, digital input, or relay-driver stage through an external pull-up. Because the supplied data does not provide the complete input-offset and response-time specifications, engineers should select resistor values and switching margins after checking the manufacturer datasheet. Filtering at the analog input can help prevent noise from causing repeated transitions, while hysteresis can create a deliberate dead band.
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Power-Supply Sequencing
Two independent LM393AN channels can supervise two supply rails and report whether each rail is above or below its threshold. The open-collector outputs are useful when sequencing logic requires active-low permission or fault signals, and the 8-DIP package simplifies through-hole industrial and legacy control assemblies. Each output needs an appropriate pull-up, and the circuit must tolerate the source voltage present at each input after resistor scaling. Engineers should verify common-mode limits for the particular manufacturer because the supplied search excerpts do not quantify them. Add controlled hysteresis and a defined fault delay so that normal supply ripple does not produce repeated enable toggles. External logic can then combine the two comparator states into a controlled startup sequence.
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Open-Drain Interface Translation
The LM393AN can translate a bipolar voltage threshold into an open-collector digital signal suitable for an open-drain bus or wired logic arrangement. The pull-up resistor defines the logic-high voltage, allowing the interface to use a lower-voltage digital domain while the comparator evaluates a higher-voltage analog signal. This use benefits from the device's two independent channels, which can support two related control inputs. Verify that the input signal remains inside the selected manufacturer's common-mode range and that the pull-up voltage does not exceed the output ratings. Include a suitable driver or level-shifting arrangement if the bus requires isolation, direction control, or higher current. The result is a flexible legacy-compatible interface using a familiar through-hole package.
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Motor and Relay Control
The LM393AN can generate threshold decisions for basic motor, solenoid, or relay-control systems where a low-side sinking output is preferable to a push-pull output. One comparator can evaluate a command or feedback voltage, while the other can monitor an enable condition or current-derived signal. The open-collector output can sink the input of an external driver when used with a suitable pull-up, rather than powering the relay or motor directly. Confirm the output sink-current rating and switching delay in the actual manufacturer datasheet, and provide transistor or driver protection for inductive loads. Flyback protection and separate drive circuitry are required; the comparator should not be treated as a load driver without those checks.
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Сводка рекомендуемых товаров
Справочные инженерные данные для LM393AN — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | LM393AN (onsemi) | LM393AN (NXP Semiconductors) | LM393AN (Motorola) | LM393P |
|---|---|---|---|---|---|
| Package | 8-DIP | 8-DIP - same | 8-DIP - same | 8-DIP - same | PDIP-8 - same pin count |
| Brand | STMicroelectronics | onsemi | NXP Semiconductors | Motorola | Texas Instruments |
| Comparator Configuration | Dual independent | Dual independent | Dual independent | Dual independent | Dual comparator |
| Output Type | Open-collector | Open-collector | Open-collector LM393-family architecture | Open-collector LM393-family architecture | Open-collector LM393-family architecture |
| Supply Configuration | Single or split supply | Single or split supply | Single-supply-capable LM393-family architecture | Single or split supply | Single or split supply |
| Common-Mode Operation | Extends toward ground on a single supply | LM393-family common-mode behavior | LM193/LM393-family common-mode behavior | LM393-family common-mode behavior | LM393-family common-mode behavior |
| Mounting Style | Through-hole | Through-hole 8-DIP | Through-hole DIP | Through-hole DIP | Through-hole PDIP-8 |
Ключевые отличия
- Two independent channels in one 8-DIP package (против LM393P)
- Open-collector interface flexibility (против LM393AN (onsemi))
- Single- and split-supply operating capability (против LM393AN (Motorola))
Заметки по проектированию
Do not treat the open-collector output as a push-pull logic output. Each active channel requires a suitable pull-up resistor to the interface supply. Confirm the selected manufacturer's output sink-current rating, output voltage limits, and propagation delay before setting the resistor value. Also verify that the input source remains within the common-mode range at the minimum and maximum system supply conditions.
Place each pull-up resistor close to the corresponding OUT pin, and keep the input resistors and reference components close to IN+ and IN-. In through-hole industrial assemblies, minimize loop area around sensitive threshold nodes and provide a stable ground return. If both comparator channels monitor related signals, route them consistently to reduce differential ground pickup. Add decoupling at the supply pins according to the manufacturer datasheet rather than assuming a universal capacitor value.
The supplied excerpts do not quantify the LM393AN supply current, so battery and low-power designs must include the manufacturer's worst-case quiescent-current value. Use split-supply operation only when the input and output ranges satisfy both channels' common-mode limits. Since open-collector outputs source no current, power use includes the pull-up network and any attached logic, which can dominate in lightly loaded designs.
Информация о соответствии
The supplied verified results do not extract compliance declarations for the LM393AN. Compliance may differ by manufacturer and production lot, so the declaration of record and current product page for the purchased source must be checked.